sleep and won't wake up on app...car drives fine....
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From: Seattle
sleep and won't wake up on app...car drives fine....
Hi,
I was wondering if the telematics fuse pull works for my issue. And if it does, does anyone know what fuse it is. Car was parked for a week...drives great. App on two phones says car remains asleep....
Yes, I searched.
Thanks!
Jeff
I was wondering if the telematics fuse pull works for my issue. And if it does, does anyone know what fuse it is. Car was parked for a week...drives great. App on two phones says car remains asleep....
Yes, I searched.
Thanks!
Jeff
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From: Western MA
If the car is parked for more than four days the telematics will go to sleep and you have to initiate one ignition cycle to reset it.
EDIT: Oh, saw you already drove it but apps haven't reset. I would try logging out of the app, make sure the app is actually closed (swiped away) on the phone, and then restart the app and log back in.
EDIT: Oh, saw you already drove it but apps haven't reset. I would try logging out of the app, make sure the app is actually closed (swiped away) on the phone, and then restart the app and log back in.
Last edited by Thunder Dump; Apr 30, 2025 at 07:51 PM.
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From: Seattle
Thank you!
Stayed asleep even with the app logout, etc. Powering off both phones ...no dice either. So, decided to do a battery reset - unplugged for 15 minutes...will retrain the car and then leave it on the charger overnight to be extra safe. Weird. Maybe time to get a new battery... Car runs great.
Thank you again.
Stayed asleep even with the app logout, etc. Powering off both phones ...no dice either. So, decided to do a battery reset - unplugged for 15 minutes...will retrain the car and then leave it on the charger overnight to be extra safe. Weird. Maybe time to get a new battery... Car runs great.
Thank you again.
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From: Seattle
Car battery disconnected for 15 minutes. Apps logged off, turned off....car still asleep on the apps! Charging the battery and if that is not helpful, may call JLR. Any ideas? Does the telematics unit ever just die...?
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From: Seattle
Not having any SOS warnings at all on my end...so while it "could" be a battery, seems odd to just be asleep on the app but have a perfect car....my gut says it is a JLR/server issue...will call asap.
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From: Ellicott City, MD
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Huh, the same day on this end. ...
I have a battery on order.....called JLR...they gave me a process to do with the car to "wake it up" that failed. Now they say I may need a new TCU. Odd.
They did tell me that they could see my car on their end right now despite my app not working...so SOS worked, etc. My services expire in 2026 (just renewed of course).
Question to all - are TCU's vin locked?
I have a battery on order.....called JLR...they gave me a process to do with the car to "wake it up" that failed. Now they say I may need a new TCU. Odd.
They did tell me that they could see my car on their end right now despite my app not working...so SOS worked, etc. My services expire in 2026 (just renewed of course).
Question to all - are TCU's vin locked?
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From: Western MA
The app GUI did recently get a major facelift--don't know if the date it stopped working correctly corresponded with the app update or not but it may be worth asking about. Perhaps there is corrupt app data still showing the car as sleeping even though it isn't. Completely uninstall and delete the app, reboot the phone, then redownload and install the app and sign in again.
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From: Seattle
The app GUI did recently get a major facelift--don't know if the date it stopped working correctly corresponded with the app update or not but it may be worth asking about. Perhaps there is corrupt app data still showing the car as sleeping even though it isn't. Completely uninstall and delete the app, reboot the phone, then redownload and install the app and sign in again.
App delete and reinstall and then:Please use the following steps to address the concerns you reported:
- Turn your vehicle on
- Press and hold the Roadside Assistance button (marked with a wrench and telephone, and located on the left side of the overhead console above the rear view mirror) for ten to fifteen seconds, or until the rapid flashing slows
- Using your cell phone, turn mobile data and WiFi OFF
- Turn Vehicle OFF
- Open/close driver side door
- Turn vehicle back ON
- Using your cell phone, turn mobile data and WiFi ON
- Turn vehicle OFF
- Open driver side door and exit the vehicle
- Close and lock door with your key fob
- Use Remote Start for your vehicle
(Obviously, number 11 did not work for me.)
So I told them it failed. Another call then happened per plan the next day....
JLR support (national) has been good.
Car did not wake up on the app. And, JLR noted to me that they do see the car but DO NOT SEE THE TELEMATICS UNIT. Sorry, should have added that. They can see a lot apparently.
jb
Last edited by jcb-memphis; May 3, 2025 at 10:43 AM.
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Joined: Apr 2016
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From: Ellicott City, MD
Huh, the same day on this end. ...
I have a battery on order.....called JLR...they gave me a process to do with the car to "wake it up" that failed. Now they say I may need a new TCU. Odd.
They did tell me that they could see my car on their end right now despite my app not working...so SOS worked, etc. My services expire in 2026 (just renewed of course).
Question to all - are TCU's vin locked?
I have a battery on order.....called JLR...they gave me a process to do with the car to "wake it up" that failed. Now they say I may need a new TCU. Odd.
They did tell me that they could see my car on their end right now despite my app not working...so SOS worked, etc. My services expire in 2026 (just renewed of course).
Question to all - are TCU's vin locked?
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From: Seattle
My car went to sleep on 4/23 per the app. The location of where it was at that time is correct.
From then to when I posted, I was driving the car fine. Key works. No error messages related to the SOS function, etc. I use a CarPlay unit that has been in the car for years now, so I don't even know if nav is working (and don't care - CarPlay is MUCH better....), so if nav died, don't know.
Went to the app because I wanted to confirm the car was locked and only then did I see it was asleep.
The app got updated as part of my keeping my phone up to date...but this "new" app had been working ok.
I renewed my remote in control software just a few weeks ago. Expires 2026. (Maybe they expited it by mistake of course....will email and ask, human error may be the best way to think about this but they know it is good to 2026, so doubtful....but worth a check).
Dealers around here have gone Land Rover...
I asked on here what to do, thank you all, nothing worked. So I called JLR.
They gave me the list of steps above. That failed. They called back yesterday and in the conversation they noted they can "see" my car in their system. They cannot "see" the TCU so they think it may need software and told me to go into the dealer. They claim SOS and roadside buttons still work. Not sure on the theft control stuff given the link to the gps in this box, etc.
I plan to try a battery first. If that fails...dealer trip. How much is a dealer TCU just in case I need a new one....
Wonder if these sorts of issues can be done via hacks trying to get data from the car....like they can collect data from keys remotely....
Part of me is thinking to just get a refund on the incontrol and live without it....
Advice welcome.
From then to when I posted, I was driving the car fine. Key works. No error messages related to the SOS function, etc. I use a CarPlay unit that has been in the car for years now, so I don't even know if nav is working (and don't care - CarPlay is MUCH better....), so if nav died, don't know.
Went to the app because I wanted to confirm the car was locked and only then did I see it was asleep.
The app got updated as part of my keeping my phone up to date...but this "new" app had been working ok.
I renewed my remote in control software just a few weeks ago. Expires 2026. (Maybe they expited it by mistake of course....will email and ask, human error may be the best way to think about this but they know it is good to 2026, so doubtful....but worth a check).
Dealers around here have gone Land Rover...
I asked on here what to do, thank you all, nothing worked. So I called JLR.
They gave me the list of steps above. That failed. They called back yesterday and in the conversation they noted they can "see" my car in their system. They cannot "see" the TCU so they think it may need software and told me to go into the dealer. They claim SOS and roadside buttons still work. Not sure on the theft control stuff given the link to the gps in this box, etc.
I plan to try a battery first. If that fails...dealer trip. How much is a dealer TCU just in case I need a new one....
Wonder if these sorts of issues can be done via hacks trying to get data from the car....like they can collect data from keys remotely....
Part of me is thinking to just get a refund on the incontrol and live without it....
Advice welcome.
Last edited by jcb-memphis; May 3, 2025 at 11:46 AM. Reason: summarizing
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From: Seattle
If I get the stuff working, does it mean that the car is 4g if it was working 4/22/25? I had/have no idea what it is, but JLR said they could see the car's control units remotely, just not the telematics control unit. Not sure what that means...?
Insight/wisdom needed here please.
Thank you in advance. I am just perplexed....did the Telematics unit just die - does that actually happen....(not battery, unit)?
Insight/wisdom needed here please.
Thank you in advance. I am just perplexed....did the Telematics unit just die - does that actually happen....(not battery, unit)?
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Joined: Jun 2024
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From: SacTown
@jcb-memphis Can you OBD2 scan for any codes that might give a clue? If the TCU is dead it will surely generate a code plus JLR wouldn't be able to see the car. The TCUs have their own SIM card and were initially 3G, right? But 3G is gone and the TCU must be working on 4G these days.
If there are no codes I would go ahead and expose the TCU, remove its battery, unplug its cable harness, then reverse the steps and see what happens. For the cable use a multimeter to see if you are getting current from the fusebox, and check the TCU battery voltage.
These units are also used in LR so that LR dealer should be able to figure it out if the DIY attempts fail.
If there are no codes I would go ahead and expose the TCU, remove its battery, unplug its cable harness, then reverse the steps and see what happens. For the cable use a multimeter to see if you are getting current from the fusebox, and check the TCU battery voltage.
These units are also used in LR so that LR dealer should be able to figure it out if the DIY attempts fail.
Last edited by JagCode3; May 4, 2025 at 07:44 AM.
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From: Seattle
@jcb-memphis Can you OBD2 scan for any codes that might give a clue? If the TCU is dead it will surely generate a code plus JLR wouldn't be able to see the car. The TCUs have their own SIM card and were initially 3G, right? But 3G is gone and the TCU must be working on 4G these days.
If there are no codes I would go ahead and expose the TCU, remove its battery, unplug it's cable harness, then reverse the steps and see what happens. For the cable use a multimeter to see if you are getting current from the fusebox, and check the TCU battery voltage.
These units are also used in LR so that LR dealer should be able to figure it out if the DIY attempts fail.
If there are no codes I would go ahead and expose the TCU, remove its battery, unplug it's cable harness, then reverse the steps and see what happens. For the cable use a multimeter to see if you are getting current from the fusebox, and check the TCU battery voltage.
These units are also used in LR so that LR dealer should be able to figure it out if the DIY attempts fail.
Around here I think T-Mobile's 2g was a fall back for 3g cars...and they were/are killing off 2g starting late 2024 and planned to kill it around now....
My OBD2 is not JLR smart, so will stop by my mechanic who has the full pro stuff.....can almost do dealer stuff.
Battery is on order. Once here, will try that first. Wires and such too...maybe one is loose.
Then dealer.
Senior Member
Joined: Jun 2024
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From: SacTown
I also seem to remember reading somewhere that if the TCU is dead or disconnected, the car will not be driveable. It's a safety feature designed to shut down the electrical system in case of a crash.
https://www.jaguarforums.com/forum/f...9/#post2798344
https://www.jaguarforums.com/forum/f...9/#post2798344
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Joined: Apr 2016
Posts: 67
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From: Ellicott City, MD
Thank you. Will follow this advice.
Around here I think T-Mobile's 2g was a fall back for 3g cars...and they were/are killing off 2g starting late 2024 and planned to kill it around now....
My OBD2 is not JLR smart, so will stop by my mechanic who has the full pro stuff.....can almost do dealer stuff.
Battery is on order. Once here, will try that first. Wires and such too...maybe one is loose.
Then dealer.
Around here I think T-Mobile's 2g was a fall back for 3g cars...and they were/are killing off 2g starting late 2024 and planned to kill it around now....
My OBD2 is not JLR smart, so will stop by my mechanic who has the full pro stuff.....can almost do dealer stuff.
Battery is on order. Once here, will try that first. Wires and such too...maybe one is loose.
Then dealer.
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Senior Member
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Posts: 673
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From: Seattle
Thread Starter
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Posts: 673
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From: Seattle
So according to the JLR In Control national tech support, they (TOPIX) can see my car but cannot see the telematics control unit at all (cannot see software version). The car has no other issues. No codes (will double check).
I was told though that 2016 cars and newer can be upgraded to work with the new cellular (assuming 4g/LTE). Cost was not known to them.
Called the dealer. No other cars in the area with this problem (so may not be 2g going away)....will have them check for software updates. TCU may have just failed too. Cost not known/shared as "we have to see the car" - which is fair....but a ballpark worst case was desired and no answer could be given. I am not clear if 2016 cars are 4g...in theory it is possible that they are 4g.
Lots of variables:
1. TCU battery (unlikely).
2. TCU failed (possible).
3. 2g was finally ended in my area (possible, buy why no other calls to the dealer or to JLR national....).
My gut says it is number 2 and to fix it I plan to try to get it 4g/lte or newer (5g) if I replace things....if not super expensive....
JLR national has been great. They are very willing to help but don't have a lot of power - it all is "you need to go to the retailer."
I was told though that 2016 cars and newer can be upgraded to work with the new cellular (assuming 4g/LTE). Cost was not known to them.
Called the dealer. No other cars in the area with this problem (so may not be 2g going away)....will have them check for software updates. TCU may have just failed too. Cost not known/shared as "we have to see the car" - which is fair....but a ballpark worst case was desired and no answer could be given. I am not clear if 2016 cars are 4g...in theory it is possible that they are 4g.
Lots of variables:
1. TCU battery (unlikely).
2. TCU failed (possible).
3. 2g was finally ended in my area (possible, buy why no other calls to the dealer or to JLR national....).
My gut says it is number 2 and to fix it I plan to try to get it 4g/lte or newer (5g) if I replace things....if not super expensive....
JLR national has been great. They are very willing to help but don't have a lot of power - it all is "you need to go to the retailer."
Last edited by jcb-memphis; May 5, 2025 at 11:58 AM.
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Joined: May 2013
Posts: 6,997
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From: Metrowest Boston
Checking for codes is important - the Workshop Manual shows a ton of codes that can be caused by the TCU. (Search for ‘telematics’.)
https://www.dropbox.com/scl/fi/o6d1x...=na3y2109&dl=0
I found some crazy stuff in the Workshop Manual related to the TCU that I haven’t seen discussed, I’ll put it here…
https://www.dropbox.com/scl/fi/o6d1x...=na3y2109&dl=0
I found some crazy stuff in the Workshop Manual related to the TCU that I haven’t seen discussed, I’ll put it here…
TELEMATICS CONTROL MODULE BATTERY PACK
A battery pack, consisting of two battery cells, is connected to the Telematics Control Module (TCU).
The battery pack enables continued operation in the event of a vehicle main power source dis-
connection; for example in a major accident or in the case of deliberate action of a thief as part of a
vehicle theft attempt. This feature enables the eCall, bCall and vehicle tracking functions to carry on
operating in the above mentioned circumstances.
The battery pack is located in the TCU, under a cover which is retained by a screw.
The battery pack contains one re-chargeable cell and one non-rechargeable cell. The two battery cells
are controlled separately by the TCU software.
NOTE:
The two battery cells cannot be replaced as separate items. The battery pack is replaced as a
complete unit.
The use of two different battery cells provides continued performance at very low temperatures. The
re-chargeable cell cannot deliver the charge effectively at very low temperatures. The non-
rechargeable cell has improved performance at low temperatures.
The back-up battery will only be active during an eCall, bCall or stolen vehicle tracking session in
which the vehicle power supply is disabled. Once the non-rechargeable cell has been used it will
require replacement to restore the full capability of the eCall and stolen vehicle tracking systems.
TCU battery back-up power is also required for the Land Rover logistics tracking system when the
vehicle is in transit mode.
Transit mode removes power to the TCU approximately 15 seconds after the ignition is switched off
(power mode 0). The ignition off mode may occur before the TCU has sent all of its logistics tracking
data to the manufacturer servers.
The backup battery enables the TCU to reliably deliver this data. The TCU is programmed not to use
the non-rechargeable cell for this purpose.
The TCU is in a pre-activated state when in transit mode. The non-rechargeable battery function is not
activated as it would become depleted during transportation to the dealer and would immediately
require a service replacement before handing the vehicle over to the customer. For this reason only
the re-chargeable cell is used in these circumstances.
During the vehicle Pre-Delivery Inspection (PDI) process the TCU is removed from transit mode and
switched on to an 'activated state' where both battery cells become active. During a TCU main power
source dis-connection the re-chargeable battery cell will always be used first. The non-rechargeable
cell is only used if eCall or stolen vehicle tracking are activated.
The expected battery pack life is approximately 10 years if not used frequently. The warranty period
of the battery pack may differ between markets.
The TCU charges the re-chargeable cell when the engine is running (power mode 7). The charging
function is controlled and regulated by the TCU software.
The following messages are displayed:
SOS System Limited (Displayed if call is possible but with limited service (for example, if
microphone or speaker is faulty (Diagnostic Trouble Code (DTC) present) or the backup battery is
depleted but the call can be placed and vehicle data transmitted))
SOS System Not Available (Displayed if TCU is unable to attempt a call (for example, if no network
available or TCU has no CAN network connectivity))
A DTC is set in the TCU in the event of SOS System Limited.
When the back-up battery has been replaced, the system must be re-set using a specific application
on a Jaguar approved diagnostic system, setting the battery level back to 100%.
SERVICE MODE
Before disconnecting power to the Telematics Control Module (TCU), for example disconnecting the
primary vehicle battery to carry out maintenance repairs, the vehicle owner must place the TCU into
'Service Mode'.
If the disconnection procedure is not carried out, the system will activate the InControl Secure
application and will enter 'Theft Notification' or 'Stolen Vehicle Tracking' mode during which time the
charge in the back-up battery would be used. If the non-rechargeable back-up cell becomes depleted
through this action, it may reach the point where it requires replacing.
For security purposes 'Service Mode' is the sole responsibility of the vehicle owner.
During vehicle maintenance, where the primary vehicle battery is disconnected for a period of time
exceeding the 10 hour window, the vehicle owner must either be informed by the dealer to re-activate
Service Mode (using their mobile phone app) or the owner must inform the 'Stolen Vehicle Tracking'
service provider that the vehicle is currently in the dealership for repairs with the vehicle battery
disconnected, instructing the service provider to ignore the Stolen Vehicle Tracking notifications
during the repair period.
TRANSPORT MODE
The Telematics Control Module (TCU) contains a motion sensor which is used for vehicle movement
detection as part of the stolen vehicle tracking system. Prior to transporting the vehicle, for example a
ferry journey, the vehicle owner must place the TCU into 'Transport Mode' to disable the motion
sensor.
If the motion sensor is not disabled and the ignition is switched off (power mode = 0), but vehicle
movement is detected, the 'Theft Notification' function will be activated. As with Service Mode,
Transport Mode is the sole responsibility of the vehicle owner for security reasons.
The motion sensor is capable of detecting slow movement, e.g. jacking the vehicle to remove a road
wheel, or winching onto a transporter.
Triggering of the sensor does not immediately generate a 'Theft Notification', but it will activate the
GPS receiver and measure the vehicle's movement. If the vehicle moves more than a predefined
distance (approximately 200 meters) the TCU sends a theft alert to the service provider.
The service provider contacts the vehicle owner to determine if a genuine theft has taken place. If a
vehicle theft is confirmed the service provider initiates full GPS tracking of the vehicle.
Transport Mode disables the movement assessment by the GPS that follows a motion detection, therefore no 'Theft Notification' will be sent to the service provider. Should transporting the vehicle exceed the 10 hour window it is the responsibility of the vehicle owner to reset Transport Mode to avoid a false theft notification being generated.
When the vehicle has the ignition off (power mode 0) and the MultiCAN buses are 'asleep', the
Telematics Control Module (TCU) is still active, enabling movement detection should an illegal attempt
be made to move the vehicle. The TCU has a permanent battery feed to enable this function. The
drain on the vehicle primary battery is minimal and the vehicle remains well within its quiescent drain
target.
The TCU is linked to the engine immobilization circuit. When a start request is made the Central
Junction Box (CJB) requests the TCU to pass a secure identification over the MultiCAN bus. If the
identification matches the one in the CJB, the start request is authorised.
In the event of disconnection or damage to the roof pod or the Telematics antenna, resulting in the
loss of the GSM signal, an internal antenna, integrated into the TCU, is used as a back-up GSM
antenna. The backup GSM antenna is used to re-establish communication with the emergency service
provider or TSP.
A battery pack, consisting of two battery cells, is connected to the Telematics Control Module (TCU).
The battery pack enables continued operation in the event of a vehicle main power source dis-
connection; for example in a major accident or in the case of deliberate action of a thief as part of a
vehicle theft attempt. This feature enables the eCall, bCall and vehicle tracking functions to carry on
operating in the above mentioned circumstances.
The battery pack is located in the TCU, under a cover which is retained by a screw.
The battery pack contains one re-chargeable cell and one non-rechargeable cell. The two battery cells
are controlled separately by the TCU software.
NOTE:
The two battery cells cannot be replaced as separate items. The battery pack is replaced as a
complete unit.
The use of two different battery cells provides continued performance at very low temperatures. The
re-chargeable cell cannot deliver the charge effectively at very low temperatures. The non-
rechargeable cell has improved performance at low temperatures.
The back-up battery will only be active during an eCall, bCall or stolen vehicle tracking session in
which the vehicle power supply is disabled. Once the non-rechargeable cell has been used it will
require replacement to restore the full capability of the eCall and stolen vehicle tracking systems.
TCU battery back-up power is also required for the Land Rover logistics tracking system when the
vehicle is in transit mode.
Transit mode removes power to the TCU approximately 15 seconds after the ignition is switched off
(power mode 0). The ignition off mode may occur before the TCU has sent all of its logistics tracking
data to the manufacturer servers.
The backup battery enables the TCU to reliably deliver this data. The TCU is programmed not to use
the non-rechargeable cell for this purpose.
The TCU is in a pre-activated state when in transit mode. The non-rechargeable battery function is not
activated as it would become depleted during transportation to the dealer and would immediately
require a service replacement before handing the vehicle over to the customer. For this reason only
the re-chargeable cell is used in these circumstances.
During the vehicle Pre-Delivery Inspection (PDI) process the TCU is removed from transit mode and
switched on to an 'activated state' where both battery cells become active. During a TCU main power
source dis-connection the re-chargeable battery cell will always be used first. The non-rechargeable
cell is only used if eCall or stolen vehicle tracking are activated.
The expected battery pack life is approximately 10 years if not used frequently. The warranty period
of the battery pack may differ between markets.
The TCU charges the re-chargeable cell when the engine is running (power mode 7). The charging
function is controlled and regulated by the TCU software.
The following messages are displayed:
SOS System Limited (Displayed if call is possible but with limited service (for example, if
microphone or speaker is faulty (Diagnostic Trouble Code (DTC) present) or the backup battery is
depleted but the call can be placed and vehicle data transmitted))
SOS System Not Available (Displayed if TCU is unable to attempt a call (for example, if no network
available or TCU has no CAN network connectivity))
A DTC is set in the TCU in the event of SOS System Limited.
When the back-up battery has been replaced, the system must be re-set using a specific application
on a Jaguar approved diagnostic system, setting the battery level back to 100%.
SERVICE MODE
Before disconnecting power to the Telematics Control Module (TCU), for example disconnecting the
primary vehicle battery to carry out maintenance repairs, the vehicle owner must place the TCU into
'Service Mode'.
If the disconnection procedure is not carried out, the system will activate the InControl Secure
application and will enter 'Theft Notification' or 'Stolen Vehicle Tracking' mode during which time the
charge in the back-up battery would be used. If the non-rechargeable back-up cell becomes depleted
through this action, it may reach the point where it requires replacing.
For security purposes 'Service Mode' is the sole responsibility of the vehicle owner.
During vehicle maintenance, where the primary vehicle battery is disconnected for a period of time
exceeding the 10 hour window, the vehicle owner must either be informed by the dealer to re-activate
Service Mode (using their mobile phone app) or the owner must inform the 'Stolen Vehicle Tracking'
service provider that the vehicle is currently in the dealership for repairs with the vehicle battery
disconnected, instructing the service provider to ignore the Stolen Vehicle Tracking notifications
during the repair period.
TRANSPORT MODE
The Telematics Control Module (TCU) contains a motion sensor which is used for vehicle movement
detection as part of the stolen vehicle tracking system. Prior to transporting the vehicle, for example a
ferry journey, the vehicle owner must place the TCU into 'Transport Mode' to disable the motion
sensor.
If the motion sensor is not disabled and the ignition is switched off (power mode = 0), but vehicle
movement is detected, the 'Theft Notification' function will be activated. As with Service Mode,
Transport Mode is the sole responsibility of the vehicle owner for security reasons.
The motion sensor is capable of detecting slow movement, e.g. jacking the vehicle to remove a road
wheel, or winching onto a transporter.
Triggering of the sensor does not immediately generate a 'Theft Notification', but it will activate the
GPS receiver and measure the vehicle's movement. If the vehicle moves more than a predefined
distance (approximately 200 meters) the TCU sends a theft alert to the service provider.
The service provider contacts the vehicle owner to determine if a genuine theft has taken place. If a
vehicle theft is confirmed the service provider initiates full GPS tracking of the vehicle.
Transport Mode disables the movement assessment by the GPS that follows a motion detection, therefore no 'Theft Notification' will be sent to the service provider. Should transporting the vehicle exceed the 10 hour window it is the responsibility of the vehicle owner to reset Transport Mode to avoid a false theft notification being generated.
When the vehicle has the ignition off (power mode 0) and the MultiCAN buses are 'asleep', the
Telematics Control Module (TCU) is still active, enabling movement detection should an illegal attempt
be made to move the vehicle. The TCU has a permanent battery feed to enable this function. The
drain on the vehicle primary battery is minimal and the vehicle remains well within its quiescent drain
target.
The TCU is linked to the engine immobilization circuit. When a start request is made the Central
Junction Box (CJB) requests the TCU to pass a secure identification over the MultiCAN bus. If the
identification matches the one in the CJB, the start request is authorised.
In the event of disconnection or damage to the roof pod or the Telematics antenna, resulting in the
loss of the GSM signal, an internal antenna, integrated into the TCU, is used as a back-up GSM
antenna. The backup GSM antenna is used to re-establish communication with the emergency service
provider or TSP.
Last edited by DJS; May 5, 2025 at 11:47 AM.