Dodge Ram Truck 1500-2500-3500. Manual — part 595
FCM-WIPER ON-OFF RELAY OUTPUT CIRCUIT LOW (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:
When the FCM detects a low condition in the relay
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 Low?
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.
8R - 20
WIPERS/WASHERS - ELECTRICAL DIAGNOSTICS
DR/DH
FCM-WIPER ON-OFF RELAY OUTPUT CIRCUIT LOW (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
Low?
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.
Remove the FCM from the IPM.
Measure the resistance between ground and the Wiper On/Off Relay Control circuit in the IPM.
Is the resistance below 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.
DR/DH
WIPERS/WASHERS - ELECTRICAL DIAGNOSTICS
8R - 21
FCM-WIPER PARK SWITCH INPUT PERFORMANCE
8R - 22
WIPERS/WASHERS - ELECTRICAL DIAGNOSTICS
DR/DH
FCM-WIPER PARK SWITCH INPUT PERFORMANCE (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 a performance condition on the BUS
Possible Causes
WIPER MOTOR PARK SWITCH GROUND CIRCUIT OPEN
WIPER MOTOR
WIPER PARK SWITCH SENSE CIRCUIT SHORT TO VOLTAGE
WIPER PARK SWITCH SENSE CIRCUIT SHORT TO GROUND
WIPER PARK SWITCH SENSE CIRCUIT OPEN
POWER DISTRIBUTION CENTER
FRONT CONTROL MODULE
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 Park Switch
Input Performance?
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 - 23
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