Tests AI: DTC U0140 - Lost Communication With Body Control Module (GEM)

PINPOINT TEST AI: DTC U0140 - LOST COMMUNICATION WITH BODY CONTROL MODULE (GEM)

AI1-AI2:

AI3-AI5:

Normal Operation
The instrument cluster sets DTC U0140 if data messages for following systems or data types are missing:
- Ignition switch position
- Key-in-ignition switch
- Tire pressure system
- Backlighting dimmer
- Door ajar status
- Headlamp on warning command
- Key-in-ignition warning command
- Parking brake status
- Parking brake chime request
- Brake warning indicator request
- High beam indicator request
- Daytime running lamps
- Brake fluid level low
- RF low beam circuit
- LF low beam circuit
- Fog lamp relay circuit
- Autolamp switch status
- Parking lamps circuit
- Brake lamp on status

Once the instrument cluster sets DTC U0140, multiple indicators are likely to be inoperative in the cluster. Other modules that require data from the instrument cluster will all set communication DTCs and may also exhibit system function concerns.

Possible Causes
- Low battery voltage
- Communication network
- SJB