Electrically Heated Systems; Defog Relay Control Ckt Shorted To Batt - Dodge Ram 2004 Service Manual

Symptom:

DEFOG RELAY CONTROL CKT SHORTED TO BATT

When Monitored and Set Condition:
DEFOG RELAY CONTROL CKT SHORTED TO BATT
When Monitored: With the Ignition on and the Rear Defogger switch depressed.
Set Condition: This DTC will set when the A/C Heater Control Module senses excessive
current on the Defogger Relay Control circuit.
CHECK FOR HVAC DTCS
RELAY SHORTED
A/C HEATER CONTROL MODULE SHORTED TO BATTERY
DEFOGGER RELAY CONTROL SHORTED TO BATTERY
INTEGRATED POWER MODULE
TEST
1 Turn the ignition on.
With the DRBIII , record and erase DTCs.
Depress the EBL Switch on the A/C Heater Control Module.
With the DRBIII , read the active DTCs.
Does the DRBIII display DEFOG RELAY CONTROL CKT SHORTED TO BATT?
Yes → Go To 2
→ Using the wiring diagram/schematic as a guide, inspect the
No
2 Turn the ignition off.
One at a time remove and install a known good relay in place of the Heated Mirror
Relay and then the EBL relay if equipped.
NOTE: Do the following steps for each relay.
Turn the ignition on.
With the DRBIII , record and erase DTCs.
Depress the EBL Switch on the A/C Heater Control Module.
With the DRBIII , read the active DTCs.
Does the DRBIII display DEFOG RELAY CONTROL CKT SHORTED TO BATT?
Yes → Go To 3
→ Replace the Relay that set the DTC.
No

ELECTRICALLY HEATED SYSTEMS

POSSIBLE CAUSES
ACTION
wiring and connectors. Refer to any Hotline letters or Technical
Service Bulletins that may apply.
Perform BODY VERIFICATION TEST - VER 1.
Perform BODY VERIFICATION TEST - VER 1.
323
APPLICABILITY
All
All