Missing Lamp Dimming Message

Test 1 - 3:

SYMPTOM
MISSING LAMP DIMMING MESSAGE

WHEN MONITORED
Continuously with the ignition on.

SET CONDITION
This condition occurs when the Transfer Case Control Module stops receiving a bus message for Lamp dimming for the period of 5 seconds. The lamps are illuminated to the correct intensity through Pulse Width Modulation (PWM). If this DTC sets the Lamps will illuminate at daytime brightness.

POSSIBLE CAUSES
- Communication DTC's present
- Transfer case control module
- Intermittent wiring and connectors