Backlight Dimming RX Failure (Active)

Test 1:

Test 2:

SYMPTOM
BACKLIGHT DIMMING RX FAILURE (ACTIVE) - MANUAL A/C

WHEN MONITORED
With the ignition ON.

SET CONDITION
If the A/C - Heater Control Module does not receive the dimming function message from the BCM for more than 5 seconds, then the A/C - Heater Control Module LEDs will default to full brightness and the DTC will set.

POSSIBLE CAUSES
- Additional code(s) present
- A/C - heater control module
- Body control module - no dim message to A/C - heater control module