Electrical/ECU problem
Thread Starter
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Senior Member
Joined: Jan 2017
Posts: 102
Likes: 3
From: Herts, UK
G’day Dave,
I left a wifi OBD dongle plugged into my XJ12 a while ago and that caused the battery to drain. There is one pin in the dongle socket that is always hot and will slowly drain the battery with the dongle plugged in if the car is not driven every day.
Cheers,
Jeff.
I left a wifi OBD dongle plugged into my XJ12 a while ago and that caused the battery to drain. There is one pin in the dongle socket that is always hot and will slowly drain the battery with the dongle plugged in if the car is not driven every day.
Cheers,
Jeff.
Thread Starter
|
Senior Member
Joined: Jan 2017
Posts: 102
Likes: 3
From: Herts, UK
Possibly the last update 
Battery and charging system is good and no drain found - load test gave 12.7v
Finally found an auto electrician willing to visit the sticks - he took the ECU out and says it's as good as the day it was put in at the factory - not the slightest hint of water damage.
That leaves a 90% chance that it's the instrument cluster and 10% on the central locking system - it all depends where the immobiliser is as he said there are only 3 places the immobiliser can be and he ruled out the ECU
The main problem lately is the immobiliser kicking in and I can't even start the car if it has been left standing for a few days
I read in another post that it could be the car forgetting the key fob data and having to re-learn it if the key is turned on and ignition live and the car will start after 25 minutes - this seems to be what is happening to me as the fault code won't clear until I have tried several times and it is about 25 minutes before it clears and the car starts
So can someone confirm the immobiliser relay(?) is in the instrument cluster or not? - been googling like mad and can't find the answer
Cheers
Battery and charging system is good and no drain found - load test gave 12.7v
Finally found an auto electrician willing to visit the sticks - he took the ECU out and says it's as good as the day it was put in at the factory - not the slightest hint of water damage.
That leaves a 90% chance that it's the instrument cluster and 10% on the central locking system - it all depends where the immobiliser is as he said there are only 3 places the immobiliser can be and he ruled out the ECU
The main problem lately is the immobiliser kicking in and I can't even start the car if it has been left standing for a few days
I read in another post that it could be the car forgetting the key fob data and having to re-learn it if the key is turned on and ignition live and the car will start after 25 minutes - this seems to be what is happening to me as the fault code won't clear until I have tried several times and it is about 25 minutes before it clears and the car starts
So can someone confirm the immobiliser relay(?) is in the instrument cluster or not? - been googling like mad and can't find the answer
Cheers
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