Hi all,

I've got problems with my 2004 S-Type 2.5L V6. I had problems with the keys ('couse I'm an idiot) and had to reprogram them. Everything is working fine, the immobiliser light goes of as it should, the car cranks but does not start.
I checked SDD and there are two relevant codes: P1582 (I don't think this is an issue) and B1600 - PATS ingnition ket signal is not received. Any sugesstions?
BTW: The car used to run before

 

Hi,

P1582 - an event happened and freeze frame data has been captured.
B1600 - likley that the transponder in the key is not recognised. Or more accurately - is either not transmitting a code or is transmitting the wrong code back to the car (not paired).

Are both fobs/keys behaving in the same manner ?
Have either of the keys been successfully used to start the car since re-pairing ?
Does SDD report a warning code that the minimum number of required keys have not been paired ?

PATS module should be fine if the immobiliser light is behaving normally.

 

Hi,
both of the keys do the same and there are two keys paired. As I understand the system, the keys would not let me even crank if they wouldn't be paired. I will erase all codes and then try again.

 

Here's the PATS diagnostic info which may help you.

 

Thnaks a lot

 

I hope someone can say if that's correct or not. (I suspect it isn't.)

 

This would indicate that it is correct.

S419-12
JSB-06/02-S419-12 -10-V1EN Page 27 of 31
ECM PATS Functionality
When a key is inserted in the ignition barrel, a hardwired input is supplied to the instrument cluster.
This triggers the instrument cluster to read the PATS key code stored in the key and compare it with
one that has been previously stored. If the ignition key is subsequently turned to the 'RUN/START'
position the result of this comparison is transmitted to the ECM via the controller Area Network
(CAN).
Assuming the key status message received from the instrument cluster is OK, the ECM will respond
with a challenge code. The instrument cluster will after encryption send a response code; if this
response code matches one that the ECM has calculated the fuel injectors, ignition coils, fuel pump
drive and starter will be enabled.
The ECM will disable the fuel injectors, ignition coils, fuel pump drive and starter if any of the
following conditions apply:
1. A theft signal has been received from the instrument cluster, i.e. the key code has not been
authenticated.
2. A challenge code has been transmitted to the instrument cluster but no response code has been
received.
3. A challenge code has been transmitted to the instrument cluster and an incorrect response
received.
The ECM will log DTC P1260 for any of the following reasons:
1. PATS Sequence Time Out. This means that the PATS exchange has started but the two second
timer has expired prior to receiving the Enable / Disable Engine status.
2. Identification transfer challenge error. This occurs following an ID transfer (Part replacement), if
the result of the challenge is incorrect.
3. Challenge response errors. This occurs if the result of the challenge is incorrect, the challenge is
performed on every key 'ON' cycle.
4. Invalid key data received. This occurs if the ECM receives incorrect Key Status data.
System Diagnostics
The best method to confirm the correct operation of PATS is to check the light emitting diode (LED).
The LED should illuminate constantly for 3 seconds when the key is turned to Ignition 'RUN/START'
position and then extinguish. This validates all PATS functions (PATS Prove-out) i.e. the key
transponder matches a key code stored, the challenge/response sequence between the instrument
cluster and ECM was successful resulting in the ECM being enabled.
Engine cranks but will not start
If the engine is cranking it means that the ECM is enabled with respect to PATS.
If PATS was disabled the ECM would not engage the starter.
This could be confirmed by verifying the PATS LED prove-out (illuminated solid for 3 seconds) or by
reading Diagnostic Trouble Codes (DTCs) from the instrument cluster and ECM.

 

Thank you for the full explanation. I cleared the codes and now there is none related to PATS but the car is still not starting.
I attached the list of all DTCs.

 

OK, I'm starting anew thread

 

Going off these error codes seems like you still have a security/key issue. What device are you using with sdd?
I might be able to help remotely, PM me your contact info or contact me at
remotediagjlr gmail

 

Thanks, the car runs now without problems. I will drive it a bit and check back later.

 

Hi Tech_JLR,

I hope you’re doing well. I saw your post about resolving an intermittent PATS B1600 error on the Jaguar Forums, and I’m in a very similar situation.

My car: 2004 Jaguar XJ8 (X350)
My problem: One night at around 3 AM my car alarm went off unexpectedly. Ever since, whenever I insert any key the security light either flashes or stays on and the engine cranks but won’t fire. I’ve had new transponder chips cut and even tried a second key with no luck.

Would you be willing to walk me through exactly how you used your SDD (or other tool) to clear the B1600 code and re-sync the PATS system? Any step-by-step advice would be hugely appreciated.

Thank you in advance for any help you can offer!

 

I know nothing about SDD (I use IDS) but when I need to find info about an alarm activation I use IDS 'LAST ALARM ACTIVATION' function in the SETUP AND CONFIGURATION tab.

 

I think your best bet is to find someone with a working SDD/IDS and follow what motorcarman recomended.

Not sure the tool your using can do this. Post back if you get it fixed as that will be a great help to others.
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