Dodge Ram. Manual — part 135
Symptom:
FCM-WIPER ON-OFF RELAY OUTPUT CIRCUIT LOW
POSSIBLE CAUSES
INTERMITTENT CONDITION
WIPER ON/OFF RELAY
POWER DISTRIBUTION CENTER
FRONT CONTROL MODULE
TEST
ACTION
APPLICABILITY
1
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?
All
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.
2
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?
All
Yes
→ Go To 3
No
→ Replace the Wiper On/Off Relay in accordance with the Service
Information.
Perform BODY VERIFICATION TEST - VER 1.
3
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?
All
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.
537
WINDSHIELD WIPER & WASHER
Symptom:
FCM-WIPER ON-OFF RELAY OUTPUT CIRCUIT OPEN
POSSIBLE CAUSES
INTERMITTENT CONDITION
WIPER ON/OFF RELAY
POWER DISTRIBUTION CENTER
FRONT CONTROL MODULE
TEST
ACTION
APPLICABILITY
1
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?
All
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.
2
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?
All
Yes
→ Go To 3
No
→ Replace the Wiper On/Off Relay in accordance with the Service
Information.
Perform BODY VERIFICATION TEST - VER 1.
3
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?
All
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.
538
WINDSHIELD WIPER & WASHER
Symptom:
FCM-WIPER PARK SWITCH INPUT PERFORMANCE
POSSIBLE CAUSES
INTERMITTENT CONDITION
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
TEST
ACTION
APPLICABILITY
1
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?
All
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.
2
Turn the ignition off.
Disconnect the Wiper Motor harness connector.
Measure the resistance between ground and the Wiper Motor Park Switch Ground
circuit.
Is the resistance above 5.0 ohms?
All
Yes
→ Repair the Wiper Motor Park Switch Ground circuit for an open.
Perform BODY VERIFICATION TEST - VER 1.
No
→ Go To 3
3
Turn the ignition off.
Disconnect the Wiper Motor harness connector.
Measure the internal resistance of the Wiper Motor between terminal pin 2 and pin
3.
Is the resistance above 5.0 ohms?
All
Yes
→ Replace the Wiper Motor - Front in accordance with the Service
Information.
Perform BODY VERIFICATION TEST - VER 1.
No
→ Go To 4
539
WINDSHIELD WIPER & WASHER
TEST
ACTION
APPLICABILITY
4
Turn the ignition off.
Disconnect the IPM C4 harness connector.
Disconnect the Wiper Motor harness connector.
Measure the voltage between the Wiper Park Switch Sense circuit and ground.
Is there any voltage present?
All
Yes
→ Repair the Wiper Park Switch Sense circuit for a short to voltage.
Perform BODY VERIFICATION TEST - VER 1.
No
→ Go To 5
5
Turn the ignition off.
Disconnect the IPM C4 harness connector.
Disconnect the Wiper Motor harness connector.
Measure the resistance between ground and the Wiper Park Switch Sense circuit.
Is the resistance below 5.0 ohms?
All
Yes
→ Repair the Wiper Park Switch Sense circuit for a short to ground.
Perform BODY VERIFICATION TEST - VER 1.
No
→ Go To 6
6
Turn the ignition off.
Disconnect the IPM C4 harness connector.
Disconnect the Wiper Motor harness connector.
Measure the resistance of the Wiper Park Switch Sense circuit.
Is the resistance above 5.0 ohms?
All
Yes
→ Repair the Wiper Park Switch Sense circuit for an open.
Perform BODY VERIFICATION TEST - VER 1.
No
→ Go To 7
7
Turn the ignition off.
Remove the FCM from the IPM.
Disconnect the IPM C4 harness connector.
Measure the internal resistance of the Wiper Park Switch Sense circuit.
Is the resistance above 5.0 ohms?
All
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.
540
WINDSHIELD WIPER & WASHER
FCM-WIPER PARK SWITCH INPUT PERFORMANCE —
Continued
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