Dodge Ram 2004 - A;C - Heater Control Illumination Inoperative

Symptom:
*A/C - HEATER CONTROL ILLUMINATION INOPERATIVE
POSSIBLE CAUSES
CHECK FOR INSTRUMENT CLUSTER (MIC) DTCS
INOPERATIVE BULB(S)
A/C - HEATER CONTROL MODULE
PANEL LAMPS DRIVER CIRCUIT OPEN
INSTRUMENT CLUSTER
TEST ACTION APPLICABILITY
1 Turn the ignition on.
With the DRBIIIt in Body, Electro/Mech Cluster (MIC), read DTCs.
Does the DRBIIIt display any DTCs?
All
Yes → Refer to the Instrument Cluster category for the related symp-
tom(s).
Perform BODY VERIFICATION TEST - VER 1.
No → Go To 2
2 Turn the Headlamp switch on.
Rotate the Cargo Dome switch to the full brightness setting.
CAUTION: The test light must illuminate brightly. Compare the brightness
to that of a direct connection to the battery.
Using a 12-volt test light connected to ground, back probe the Panel Lamps Driver
circuit in the A/C-Heater Control Module C1 harness connector.
Does the test light illuminate brightly?
All
Yes → Go To 3
No → Go To 4
3 For Dual-Zone HVAC systems, proceed directly to the conclusion of this test and
answer Yes to the question. For Single-Zone HVAC systems, proceed as follows:
Turn the ignition off.
Remove the inoperative bulb(s) from the A/C - Heater Control Module.
NOTE: If necessary, hold the bulb in front of a lamp to see the filament.
Inspect the bulb(s).
Is each inoperative bulb Ok?
All
Yes → Replace the A/C - Heater Control Module in accordance with the
Service Information.
Perform BODY VERIFICATION TEST - VER 1.
No → Replace the inoperative bulb(s).
Perform BODY VERIFICATION TEST - VER 1.
397
HEATING & A/C