Dodge Ram Truck 1500-2500-3500. Manual — part 2011
DEFOG RELAY CONTROL CKT SHORTED TO BATT
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HVAC - ELECTRICAL DIAGNOSTICS
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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
1.
CHECK FOR HVAC DTC’S
Turn the ignition on.
With the DRBIII
T
, record and erase DTCs.
Depress the EBL Switch on the A/C Heater Control.
With the DRBIII
T
, read the active DTCs.
Does the DRBIII
T
display DEFOG RELAY CONTROL CKT SHORTED TO BATT?
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. (Refer to BODY VERIFICATION TEST - VER 1).
2.
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
T
, record and erase DTCs.
Depress the EBL Switch on the A/C Heater Control.
With the DRBIII
T
, read the active DTCs.
Does the DRBIII
T
display DEFOG RELAY CONTROL CKT SHORTED TO BATT?
Yes
>> Go To 3
No
>> Replace the Relay that set the DTC.
Perform BODY VERIFICATION TEST - VER 1. (Refer to BODY VERIFICATION TEST - VER 1).
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HVAC - ELECTRICAL DIAGNOSTICS
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DEFOG RELAY CONTROL CKT SHORTED TO BATT (CONTINUED)
3.
CHECK FOR A SHORTED A/C HEATER CONTROL
Turn the ignition off.
Remove the Heated Mirror Relay and the EBL relay if equipped from
the Integrated Power Module.
Disconnect the A/C Heater Control C1 harness connector.
Turn the ignition on.
Measure the voltage of the (C110) Defogger Relay Control circuit at
the A/C Heater Control C1 harness connector.
Is there any voltage present?
Yes
>> Go To 4
No
>> Replace the A/C Heater Control in accordance with the
Service Information.
Perform BODY VERIFICATION TEST - VER 1. (Refer to
BODY VERIFICATION TEST - VER 1).
4.
CHECK THE (C110) DEFOGGER RELAY CONTROL CIRCUIT FOR A SHORT TO BATTERY
Turn the ignition off.
Disconnect the Integrated Power Module C5 harness connector.
Turn the ignition on.
Measure the voltage of the (C110) Defogger Relay Control circuit at
the A/C Heater Control C1 harness connector.
Is there any voltage present?
Yes
>> Repair the (C110) Defogger Relay Control circuit for a
short to battery.
Perform BODY VERIFICATION TEST - VER 1. (Refer to
BODY VERIFICATION TEST - VER 1).
No
>> Replace the Integrated Power Module in accordance with
the Service Information.
Perform BODY VERIFICATION TEST - VER 1. (Refer to
BODY VERIFICATION TEST - VER 1).
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HVAC - ELECTRICAL DIAGNOSTICS
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DEFOG SWITCH FAULT
For a complete wiring diagram Refer to Section 8W.
Theory of Operation
The switch input changes when the switch is pushed down. A stored DTC indicates that the EBL mode switch was
stuck in a pushed position for more than 10 minutes, but has since returned to its normal state. An active DTC
indicates that the EBL mode switch is stuck in a pushed position. An active DTC will prevent proper switch and
status indicator function as evidenced by not being able to turn the EBL status indicator either on if off or off if on.
•
When Monitored:
With the ignition on.
•
Set Condition:
If the EBL mode switch stays closed for 10 minutes.
Possible Causes
A/C HEATER CONTROL
NOTE: This DTC must be active for the result of this test to be valid. Do not perform this test if this DTC is
stored. Refer to HVAC System Test for stored DTC test procedures.
Diagnostic Test
1.
REPLACE THE A/C HEATER CONTROL
Repair
Replace the A/C Heater Control in accordance with the Service Information.
Perform BODY VERIFICATION TEST - VER 1. (Refer to 8 - ELECTRICAL/ELECTRONIC CONTROL
MODULES/FRONT CONTROL MODULE - DIAGNOSIS AND TESTING).
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HVAC - ELECTRICAL DIAGNOSTICS
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