Multifunction Electronic Modules: Diagnosis Land Rover Range Rover III facelift

DIAGNOSTICS

Diagnostic monitoring is included in the operating software of the generic electronic module (GEM) and is performed on a continual basis. All of the input and output signals which are relevant for diagnostics can be read out and injected using the Land Rover approved diagnostic system. Detected faults are stored in the non volatile electrically erasable programmable read only memory (EEPROM) of the generic electronic module (GEM).

All faults stored by the generic electronic module (GEM) are stored chronologically, with a fault counter, in a fault or information area of the memory. Faults which positively point to one or more defective components are stored in the fault area. Faults which do not positively point to a defective component are stored in the information area to provide information during troubleshooting. The generic electronic module (GEM) ignores faults detected within 32 seconds of power up or when battery voltage is less than 9V.

A distinction is made between sporadic and static faults. Sporadic faults are those which have occurred at least once, and the cause of the fault message was no longer present at least one time. Static faults are faults which are still active at the time diagnostics are performed.

The generic electronic module (GEM) can store up to 30 faults at any one time. If further faults are detected following the 30th fault they are ignored. Faults can only be erased using the Land Rover approved diagnostic system.

Up to 16 faults stored by the generic electronic module (GEM) are also stored in those modules connected to the generic electronic module (GEM) via the P bus, i.e. the driver and passenger door modules and the roof opening panel module. Faults stored in the peripheral modules cannot be accessed via the diagnostic socket. The faults in the peripheral modules are used for diagnosing modules after they are removed from the vehicle.

Scheme 47

1. Move the passenger seat cushion fully rearwards.
2. Remove the Generic Electronic Module (GEM) access panel. Release the 2 clips.
3. Move the passenger seat cushion fully forwards.
4. Disconnect the battery ground cable. Refer to «SPECIFICATIONS»(ref-522601-S06524472732013011500000) .
5. Remove the GEM. Disconnect the 3 electrical connectors.