Pinpoint Test 9: The Front Display Interface Module (FDIM) Illumination Does Not Operate Correctly
PINPOINT TEST 9: THE FRONT DISPLAY INTERFACE MODULE (FDIM) ILLUMINATION DOES NOT OPERATE CORRECTLY
Normal Operation
The front display interface module (FDIM) receives the illumination signal from the smart junction box (SJB), and dims the illumination based on the position of the dimmer switch.
- DTC U0140 (Lost Communication With Body Control Module [GEM]) - sets when the FDIM is missing messages from the SJB for ignition state, illumination, or delayed accessory. Because a missing ignition state or delayed accessory signal would cause multiple symptoms (since many modules would report this error), only the illumination signal is diagnosed in this pinpoint test.In order for the FDIM to set DTC U0140, the illumination signal must be missing for greater than 5 seconds. In the event this signal is lost, the FDIM defaults to full night time brightness, resulting in a symptom of the FDIM being unable to dim.
Possible Causes
- Interior lamps system concern
- FDIM
Diagnostic Procedure
CAUTION: Use the correct probe adapter(s) when making measurements. Failure to use the correct probe adapter(s) may damage the connector.
