Dodge Ram Truck 1500-2500-3500. Manual — part 594
FCM-WIPER ON-OFF RELAY OUTPUT CIRCUIT OPEN
8R - 16
WIPERS/WASHERS - ELECTRICAL DIAGNOSTICS
DR/DH
FCM-WIPER ON-OFF RELAY OUTPUT CIRCUIT OPEN (CONTINUED)
For the Wiper Washer system circuit diagram (Refer to 8 - ELECTRICAL/WIPERS/WASHERS - SCHEMATICS AND
DIAGRAMS).
For a complete wiring diagram Refer to Section 8W.
•
When Monitored:
With the ignition on
•
Set Condition:
The FCM detects an open condition on the BUS
Possible Causes
WIPER ON/OFF RELAY
FRONT CONTROL MODULE
POWER DISTRIBUTION CENTER
1.
INTERMITTENT CONDITION
Turn the ignition on.
With the DRBIII
T
, clear all FCM DTC’s.
Turn the Wipers ON then OFF.
With the DRBIII
T
, read the DTC information.
Does the DRBIII
T
read: Wiper ON-OFF Relay
Output Circuit Open?
Yes
>> Go To 2
No
>> The condition that caused the symptom
is currently not present. Inspect the
related wiring for a possible intermittent
condition. Look for any chafed, pierced,
pinched, or partially broken wires.
Perform BODY VERIFICATION TEST -
VER 1.
DR/DH
WIPERS/WASHERS - ELECTRICAL DIAGNOSTICS
8R - 17
FCM-WIPER ON-OFF RELAY OUTPUT CIRCUIT OPEN (CONTINUED)
2.
WIPER ON/OFF RELAY
Turn the ignition off.
Install a substitute relay in place of the Wiper On/Off Relay.
Turn the ignition on.
With the DRBIII
T
, read DTCs.
Does the DRBIII
T
display: Wiper On/Off Relay Output Circuit
Open?
Yes
>> Go To 3
No
>> Replace the Wiper On/Off Relay in accordance with the
Service Information.
Perform BODY VERIFICATION TEST - VER 1.
3.
POWER DISTRIBUTION CENTER
Turn the ignition off.
Remove the Wiper On/Off Relay from the IPM.
Remove the FCM from the IPM.
Measure the resistance of the Wiper On/Off Control circuit in the IPM.
Is the resistance above 5.0 ohms?
Yes
>> Replace the Power Distribution Center (PDC ) in accordance with the Service Information.
Perform BODY VERIFICATION TEST - VER 1.
No
>> Replace the Front Control Module (FCM) in accordance with the Service Information.
Perform BODY VERIFICATION TEST - VER 1.
8R - 18
WIPERS/WASHERS - ELECTRICAL DIAGNOSTICS
DR/DH
FCM-WIPER ON-OFF RELAY OUTPUT CIRCUIT LOW
DR/DH
WIPERS/WASHERS - ELECTRICAL DIAGNOSTICS
8R - 19
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