A/C - Heater Control Illumination Inoperative - Dodge Ram 2004 Service Manual

Symptom:

*A/C - HEATER CONTROL ILLUMINATION INOPERATIVE

CHECK FOR INSTRUMENT CLUSTER (MIC) DTCS
INOPERATIVE BULB(S)
A/C - HEATER CONTROL MODULE
PANEL LAMPS DRIVER CIRCUIT OPEN
INSTRUMENT CLUSTER
TEST
1 Turn the ignition on.
With the DRBIII in Body, Electro/Mech Cluster (MIC), read DTCs.
Does the DRBIII display any DTCs?
Yes → Refer to the Instrument Cluster category for the related symp-
→ Go To 2
No
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?
Yes → Go To 3
→ Go To 4
No
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?
Yes → Replace the A/C - Heater Control Module in accordance with the
→ Replace the inoperative bulb(s).
No
POSSIBLE CAUSES
ACTION
tom(s).
Perform BODY VERIFICATION TEST - VER 1.
Service Information.
Perform BODY VERIFICATION TEST - VER 1.
Perform BODY VERIFICATION TEST - VER 1.
397
HEATING & A/C
APPLICABILITY
All
All
All