Dodge Ram Truck 1500-2500-3500. Manual — part 596

FCM-WIPER PARK SWITCH INPUT PERFORMANCE (CONTINUED)

2.

WIPER MOTOR PARK SWITCH GROUND CIRCUIT OPEN

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?

Yes

>> Repair the Wiper Motor Park Switch Ground circuit for an

open.

Perform BODY VERIFICATION TEST - VER 1.

No

>> Go To 3

3.

WIPER MOTOR

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?

Yes

>> Replace the Wiper Motor - Front in accordance with the Service Information.

Perform BODY VERIFICATION TEST - VER 1.

No

>> Go To 4

4.

WIPER PARK SWITCH SENSE CIRCUIT SHORT TO VOLTAGE

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?

Yes

>> Repair the Wiper Park Switch Sense circuit for a short to

voltage.

Perform BODY VERIFICATION TEST - VER 1.

No

>> Go To 5

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WIPERS/WASHERS - ELECTRICAL DIAGNOSTICS

DR/DH

FCM-WIPER PARK SWITCH INPUT PERFORMANCE (CONTINUED)

5.

WIPER PARK SWITCH SENSE CIRCUIT SHORT TO GROUND

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?

Yes

>> Repair the Wiper Park Switch Sense circuit for a short to

ground.

Perform BODY VERIFICATION TEST - VER 1.

No

>> Go To 6

6.

WIPER PARK SWITCH SENSE CIRCUIT OPEN

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?

Yes

>> Repair the Wiper Park Switch Sense circuit for an open.

Perform BODY VERIFICATION TEST - VER 1.

No

>> Go To 7

7.

POWER DISTRIBUTION CENTER

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?

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 - 25

FCM-WIPER SPEED RELAY OUTPUT CIRCUIT HIGH

8R - 26

WIPERS/WASHERS - ELECTRICAL DIAGNOSTICS

DR/DH

FCM-WIPER SPEED RELAY OUTPUT CIRCUIT HIGH (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 HIGH condition the BUS

Possible Causes

WIPER HIGH/LOW RELAY

FRONT CONTROL MODULE

POWER DISTRIBUTION CENTER

1.

INTERMITTENT CONDITION

Turn the ignition on.

With the DRBIII

T

, clear all FCM DTC’s.

Actuate the Wipers in all speed positions.

With the DRBIII

T

, read the DTC information.

Does the DRBIII

T

read: Wiper Speed Relay

Output Circuit High?

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 - 27