B10B3-VISCOUS/CABIN HEATER RELAY CONTROL OPEN CIRCUIT

For a complete wiring diagram Refer to Section 8W

Possible Causes

INTERMITTENT CONDITION

ASD RELAY OUTPUT CIRCUIT OPEN

VISCOUS/CABIN HEATER RELAY

VISCOUS/CABIN HEATER RELAY CONTROL CIRCUIT SHORTED TO GROUND

VISCOUS/CABIN HEATER RELAY CONTROL CIRCUIT OPEN

ENGINE CONTROL MODULE

Diagnostic Test

1. CHECK FOR ACTIVE DTC

NOTE: If the ECM detects and stores a DTC, the ECM also stores the engine/vehicle operating conditions under which the DTC was set. Some of these conditions are displayed on the scan tool at the same time the DTC is displayed.

NOTE: Before erasing stored DTCs, record these conditions. Attempting to duplicate these conditions may assist when checking for an active DTC.

Turn the ignition on.
With the scan tool, actuate the Viscous/Cabin Heater Relay.

Does the relay cycle on and off during the actuation?

Yes

Go To 2

Refer to the *CHECKING FOR AN INTERMITTENT DTC Diagnostic Procedure. (Refer to 9 - ENGINE - DIAGNOSIS AND TESTING)

2. ASD RELAY OUTPUT CIRCUIT OPEN

Turn the ignition off.
Remove the Viscous/Cabin Heater Relay from the PDC.
Turn the ignition on.
Using a 12-volt test light connected to ground, check the ASD Relay Output circuit.

Did the test light illuminate brightly?

Yes

Go To 3

Repair the ASD Relay Output circuit for an open.
Perform the ECM Verification Test Ver. 1 (Refer to 9 - ENGINE - DIAGNOSIS AND TESTING).

3. VISCOUS/CABIN HEATER RELAY

Turn the ignition off.
Install a substitute relay in place of the Viscous/Cabin Heater Relay
Turn the ignition on.
With the scan tool, actuate the Viscous/Cabin Heater Relay.

Does the relay cycle on and off during the actuation?

Yes

Replace the Viscous/Cabin Heater Relay Fan Relay.

Perform the ECM Verification Test Ver. 1 (Refer to 9 - ENGINE - DIAGNOSIS AND TESTING).

Go To4

4. VISCOUS/CABIN HEATER RELAY CONTROL CIRCUIT SHORTED TO GROUND

Turn the ignition off.
Remove the Viscous/Cabin Heater Relay from the PDC.
Disconnect the ECM harness connectors.
Measure the resistance between ground and the Viscous/Cabin Heater Relay Control circuit.

Is the resistance above 1000 ohms?

Yes

Go To 5

Repair the Viscous/Cabin Heater Relay Control circuit for a short to ground.
Perform the ECM Verification Test Ver. 1 (Refer to 9 - ENGINE - DIAGNOSIS AND TESTING).

5. VISCOUS/CABIN HEATER RELAY CONTROL CIRCUIT OPEN

Measure the resistance of the Viscous/Cabin Heater Relay Control circuit.

Is the resistance below 10.0 ohms?

Yes

Replace and program the Engine Control Module in accordance with the Service Information.

Perform the ECM Verification Test Ver. 1 (Refer to 9 - ENGINE - DIAGNOSIS AND TESTING).

Repair the Viscous/Cabin Heater Relay Control circuit for an open.
Perform the ECM Verification Test Ver. 1 (Refer to 9 - ENGINE - DIAGNOSIS AND TESTING).