Dodge Ram Truck 1500-2500-3500. Manual — part 597

FCM-WIPER SPEED RELAY OUTPUT CIRCUIT HIGH (CONTINUED)

2.

WIPER HIGH/LOW RELAY

Turn the ignition off.

Remove the Wiper High/Low Relay from the IPM.

Turn the ignition on.

Activate the Wiper Switch to all speed positions.

With the DRBIII

T

, read DTCs.

Does the DRBIII

T

display: Wiper Speed Relay Output Circuit

Open?

Yes

>> Replace the Wiper High/Low Relay in accordance with the

Service Information.

Perform BODY VERIFICATION TEST - VER 1.

No

>> Go To 3

3.

POWER DISTRIBUTION CENTER

Turn the ignition off.

Remove the Wiper High/Low Relay from the IPM.

Remove the FCM from the IPM.

Measure the voltage between the Wiper High/Low Relay Control circuit
and ground in the IPM.

Is there any voltage present?

Yes

>> Replace the Power Distribution Center (PDC) in accor-

dance 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 - 28

WIPERS/WASHERS - ELECTRICAL DIAGNOSTICS

DR/DH

FCM-WIPER SPEED RELAY OUTPUT CIRCUIT LOW

DR/DH

WIPERS/WASHERS - ELECTRICAL DIAGNOSTICS

8R - 29

FCM-WIPER SPEED 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:
The FCM detects a low condition

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.

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 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 - 30

WIPERS/WASHERS - ELECTRICAL DIAGNOSTICS

DR/DH

FCM-WIPER SPEED RELAY OUTPUT CIRCUIT LOW (CONTINUED)

2.

WIPER HIGH/LOW RELAY

Turn the ignition off.

Install a substitute relay in place of the Wiper High/Low Relay.

Turn the ignition on.

Activate the Wiper Switch to all speed positions.

With the DRBIII

T

, read DTCs.

Does the DRBIII

T

display: Wiper Speed Relay Output Circuit

Low?

Yes

>> Go To 3

No

>> Replace the Wiper High/Low Relay in accordance with the

Service Information.

Perform BODY VERIFICATION TEST - VER 1.

3.

POWER DISTRIBUTION CENTER

Turn the ignition off.

Remove the Wiper High/Low Relay.

Remove the FCM from the IPM.

Measure the resistance between ground and the Wiper High/Low 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 - 31