Front A/C - Heater Control Illumination Inoperative - Mtc - Chrysler Town and Country 2003 Owner's Manual

HEATING & A/C
Symptom:
*FRONT A/C - HEATER CONTROL ILLUMINATION INOPERATIVE -
MTC
CHECK FOR HVAC DTCS
CHECK FOR BCM DTCS
A/C - HEATER CONTROL MODULE
PANEL LAMPS DRIVER CIRCUIT OPEN
BODY CONTROL MODULE - PANEL LAMPS DRIVER OPEN
TEST
1 Turn the ignition on.
With the DRBIII , read HVAC DTCs.
Does the DRBIII display any HVAC DTCs?
Yes → Return to the symptom list and choose the symptom(s).
→ Go To 2
No
2 Turn the ignition on.
With the DRBIII , read the BCM DTCs.
Does DRBIII
Output Short?
Yes → Refer to symptoms Headlamp Switch Mismatch, Headlamp
→ Go To 3
No
3 Turn the ignition off.
Rotate the Panel Lamps Dimmer switch to the off position.
Disconnect the A/C - Heater Control C1 harness connector.
Turn the Headlamp switch on.
Measure the voltage of the Panel Lamps Driver circuit while rotating the Panel
Lamps Dimmer switch from the off position to the full brightness position.
Does the voltage change from approximately 2.5 volts to 11.5 volts?
Yes → Replace the A/C - Heater Control Module in accordance with the
→ Go To 4
No
POSSIBLE CAUSES
ACTION
Perform BODY VERIFICATION TEST - VER 1.
display Headlamp Switch: Mismatch; STG; Open; or Panel Dim
Switch Shorted To Ground, and Headlamp Switch Open in the
Exterior Lighting catagory. Refer to symptom Panel Dimming
Output Short in the Instrument Cluster catagory.
Perform BODY VERIFICATION TEST - VER 1.
Service Information.
Perform BODY VERIFICATION TEST - VER 1.
566
APPLICABILITY
All
All
All