Panel Lamp PWM Output Failure

Test 1 - 5:

Test 6 - 11:

Test 12 - 17:

Test 18 - 25:

Test 26 - 30:

Test 31:

SYMPTOM
PANEL LAMP PWM OUTPUT FAILURE

TEST NOTE
This symptom is diagnosed using the test HVAC CONTROL ILLUMINATION.

WHEN MONITORED
With the Ignition key ON and battery voltage greater than 10 volts.

SET CONDITION
The headlamp switch is in the ON position and the Instrument panel lamps are shorted for 10 consecutive seconds.

POSSIBLE CAUSES
- DRB displays ram fault
- DRB shows bus failure
- MIC cluster mismatch
- Cluster panel lamp driver circuit short GND
- Open panel lamp driver circuit
- Panel lamp PWM failure code return
- Park lamp switch output circuit open
- ASH tray lamp defective
- PRNDL lamps driver circuit defective
- Radio panel lamp driver circuit
- BCM panel lamps dimmer output circuit defective
- BCM panel lamps driver output CKT defect
- HVAC control defective
- Instrument cluster circuit board defective
- Dimmer switch signal circuit open defect
- Dimmer switch signal circuit short
- Left multi-function switch defective
- BCM dimmer switch output circuit defective
- Defective BCM
- ASH tray lamp driver circuit defective
- BCM park lamp switch output CKT defective
- Cluster illumation lamps/ printed CKT board
- Defective multi-function switch
- Instrument cluster/lamps defective
- Park lamps not lighting
- PRNDL lamps circuit short to ground
- Radio defective