Autologic have released a case study focused on the Jaguar XF 2013-2015 after a customer reported a concern of multiple warning lights illuminated on the instrument cluster.
It was found there was water ingress into the central junction box (CJB), caused by a defect in the washer pump in the washer bottle.
The water was tracing back in the loom, contaminating the CJB and rotting the plug pins.
The fix for this issue is to replace the CJB, fit a harness repair kit and a water blocking splice.
Once fitted, the CJB will also require programming.
We have found that the programming procedure is unstable and has a high failure rate, which can cause the car to become immobilised unless a specific procedure is followed.
- Firstly, copy all car configuration from the CJB Front Smart Junction Box (FSJB) to the Rear Smart Junction Box (RSJB), making sure they match.
- You must then program the Keyless Vehicle Module (KVM) as an existing module to ensure it is on the latest software, at this point, if it will not update, you will need to replace the KVM and program it as new.
- You can now fit the new CJB (FSJB).
- You will need to make sure the battery voltage is correct for programming.
- You must have the recommended 125amp charger on the vehicle to supply and maintain the correct level in the battery and the vehicle’s modules; failure to heed this warning will result in failure of the CJB programming and the car being immobilised.
- Once the battery support is on the car, you can program the CJB and carry out the post programming routines, including copying the car configuration from the RSJB, learning the chassis number, learning the target identifier (security) and verifying the keys.
- You may need to run the immobilisation reset function at the very end to re-align the modules.
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