Pinpoint Test L: The Front Control/Display Interface Module (FCDIM) Illumination Does Not Operate Correctly

Information and Entertainment System

Pinpoint Test L: The Front Control/Display Interface Module (FCDIM) Illumination Does Not Operate Correctly

Normal Operation

The Front Control/Display Interface Module (FCDIM) receives the illumination signal from the Body Control Module (BCM) and dims the illumination based on the position of the dimmer switch. In the event this signal is lost, the FCDIM defaults to full nighttime brightness, resulting in a symptom of the FCDIM being unable to dim.

This pinpoint test is intended to diagnose the following:

- Backlighting system concern
- FCDIM

PINPOINT TEST L: THE FDIM ILLUMINATION DOES NOT OPERATE CORRECTLY

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L1 CHECK FOR DTC U0140:00

- Carry out the FCDIM self-test.
- Is DTC U0140:00 present?

Yes
GO to Pinpoint Test P. Pinpoint Test P: DTC U0140:00

No
GO to L2.

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L2 CHECK FOR CORRECT FCDIM OPERATION

- Disconnect the FCDIM connector.
- Check for:
- corrosion
- damaged pins
- pushed-out pins
- Connect the FCDIM connector and make sure it seats correctly.
- Operate the system and determine if the concern is still present.
- Is the concern still present?

Yes
INSTALL a new FCDIM. REFER to Front Controls/Display Interface Module (FCDIM) Front Controls/Display Interface Module (FCDIM). TEST the system for normal operation.

No
The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector.

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