Dodge Dakota (ND). Manual — part 246
B106B,B106D–REAR DEFROST CONTROL CIRCUIT LOW/OPEN – FCM
8G - 2
HEATED GLASS - ELECTRICAL DIAGNOSTICS
ND
B106B,B106D–REAR DEFROST CONTROL CIRCUIT LOW/OPEN – FCM (CONTINUED)
For a complete wiring diagram Refer to Section 8W.
•
When Monitored:
Continuously
•
Set Condition:
When the Front Control Module does not detect voltage on the Defogger Relay Control circuit.1
Possible Causes
REAR DEFOGGER INTEGRATED POWER MODULE (IPM) FUSE
REAR WINDOW DEFOGGER RELAY
IGNITION SWITCH OUTPUT OPEN
(C115) DEFOGGER RELAY CONTROL (PDC)
FRONT CONTROL MODULE
Diagnostic Test
1.
TEST FOR INTERMITTENT CONDITION
With the scan tool, record and erase DTC’s
Operate the Rear Defogger Switch several times.
Cycle the ignition from on to off 3 times and leave on.
With the scan tool, read DTC’s.
Does the scan tool display the same DTC?
Yes
>> Go To 2
No
>> The conditions that caused this code to set are not present at this time. Using the wiring diagram/sche-
matic as a guide, inspect the wiring and connectors.
Perform BODY VERIFICATION TEST - VER 1.
2.
IPM FUSE
Turn the ignition on.
Using a 12-volt test light connected to ground, check the Rear Window
Defogger fuse in the IPM.
Does the test light illuminate and was the fuse OK?
No
>> Repair the Ignition Switch Output (Run) circuit for an open
or replace the fuse if open and check for a shorted Defog-
ger Relay.
Perform BODY VERIFICATION TEST - VER 1.
Yes
>> Go To 3
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HEATED GLASS - ELECTRICAL DIAGNOSTICS
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B106B,B106D–REAR DEFROST CONTROL CIRCUIT LOW/OPEN – FCM (CONTINUED)
3.
OPEN IGNITION SWITCH OUTPUT (RUN) TO RELAY
Remove the Rear Defogger Relay from the IPM.
Using a 12-volt test light connected to ground, check the Ignition
Switch Output circuit at the relay connector.
Does the test light illuminate?
No
>> Replace the Power Distribution Center in accordance with
the service information.
Perform BODY VERIFICATION TEST - VER 1.
Yes
>> Go To 4
4.
REAR WINDOW DEFOGGER RELAY
Install a known good relay in place of the Rear Window Defogger Relay.
With the scan tool erase DTC’s
Operate the Rear Window Defogger several times.
Cycle the ignition from on to off 3 times and leave on.
With the scan tool, read DTC’s.
Does the scan tool display the same DTC?
No
>> Replace the original Rear Window Defogger Relay.
Perform BODY VERIFICATION TEST - VER 1.
Yes
>> Go To 5
5.
CHECK THE (C115)DEFOGGER RELAY CONTROL CIRCUIT FOR A SHORT TO GROUND
Remove the Rear Window Defogger Relay from the IPM.
Disconnect the Front Control Module from the IPM 49 – way connec-
tor.
Measure the resistance between ground and the (C115) Defogger
Relay Control circuit at the relay.
Is the resistance below 1000.0 ohms?
Yes
>> Replace the Power Distribution Center in accordance with
the service information.
Perform BODY VERIFICATION TEST - VER 1.
No
>> Go To 6
8G - 4
HEATED GLASS - ELECTRICAL DIAGNOSTICS
ND
B106B,B106D–REAR DEFROST CONTROL CIRCUIT LOW/OPEN – FCM (CONTINUED)
6.
CHECK THE (C115)DEFOGGER RELAY CONTROL CIRCUIT FOR AN OPEN
Measure the resistance of the (C115) Defogger Relay Control circuit
from the relay connector to FCM connector.
Is the resistance below 3.0 ohms?
Yes
>> Replace the Front Control Module in accordance with the
service information.
Perform BODY VERIFICATION TEST - VER 1.
No
>> Replace the Power Distribution Center in accordance with
the service information.
Perform BODY VERIFICATION TEST - VER 1.
ND
HEATED GLASS - ELECTRICAL DIAGNOSTICS
8G - 5
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