Dodge Ram 2004 - Electrically Heated Systems; Defog Relay Control Ckt Shorted to Batt

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.
POSSIBLE CAUSES
CHECK FOR HVAC DTCS
RELAY SHORTED
A/C HEATER CONTROL MODULE SHORTED TO BATTERY
DEFOGGER RELAY CONTROL SHORTED TO BATTERY
INTEGRATED POWER MODULE
TEST ACTION APPLICABILITY
1 Turn the ignition on.
With the DRBIIIt, record and erase DTCs.
Depress the EBL Switch on the A/C Heater Control Module.
With the DRBIIIt, read the active DTCs.
Does the DRBIIIt display DEFOG RELAY CONTROL CKT SHORTED TO BATT?
All
Yes → Go To 2
No → Using the wiring diagram/schematic as a guide, inspect the
wiring and connectors. Refer to any Hotline letters or Technical
Service Bulletins that may apply.
Perform BODY VERIFICATION TEST - VER 1.
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 DRBIIIt, record and erase DTCs.
Depress the EBL Switch on the A/C Heater Control Module.
With the DRBIIIt, read the active DTCs.
Does the DRBIIIt display DEFOG RELAY CONTROL CKT SHORTED TO BATT?
All
Yes → Go To 3
No → Replace the Relay that set the DTC.
Perform BODY VERIFICATION TEST - VER 1.
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ELECTRICALLY HEATED SYSTEMS