Dodge Ram Truck 1500-2500-3500. Manual

DEFOG RELAY CONTROL CKT SHORTED TO BATT (CONTINUED)

For the Heated Mirror/Rear Defogger circuit diagram (Refer to 8 - ELECTRICAL/HEATED GLASS - SCHEMATICS
AND DIAGRAMS) .

For a complete wiring diagram Refer to Section 8W.

•

When Monitored:
With the Ignition on and the EBL (Rear Defogger) switch depressed.

•

Set Condition:
This DTC will set if the A/C Heater Control senses excessive current on the (C110) Defogger Relay Control
circuit.

Possible Causes

HVAC DTCS

RELAY SHORTED

(C110) DEFOGGER RELAY CONTROL CIRCUIT SHORTED TO BATTERY

A/C HEATER CONTROL SHORTED TO BATTERY

INTEGRATED POWER MODULE

Diagnostic Test

CHECK FOR HVAC DTC’S

Turn the ignition on.

With the DRBIII

, record and erase DTCs.

Depress the EBL Switch on the A/C Heater Control.

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 wiring and connectors. Refer to any Hotline

letters or Technical Service Bulletins that may apply.

Perform BODY VERIFICATION TEST - VER 1. (Refer to BODY VERIFICATION TEST - VER 1).

CHECK THE RELAY FOR A SHORT TO BATTERY

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.

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.

Perform BODY VERIFICATION TEST - VER 1. (Refer to BODY VERIFICATION TEST - VER 1).

DR/DH

HEATED GLASS - ELECTRICAL DIAGNOSTICS

8G - 3

Dodge Ram Truck 1500-2500-3500. Manual - part 337