*CHECKING THE VISCOUS/CABIN HEATER RELAY
For a complete wiring diagram Refer to Section 8W
| Possible Causes |
| FUSED B+ CIRCUIT OPEN |
| (K132) CABIN HEATER RELAY OUTPUT CIRCUIT SHORTED TO VOLTAGE |
| (K347) CABIN HEATER RELAY OUTPUT CIRCUIT SHORTED TO GROUND |
| (A119) CABIN HEATER RELAY OUTPUT CIRCUIT OPEN |
| CABIN HEATER RELAY |
Diagnostic Test
1. VISCOUS/CABIN HEATER RELAY ACTUATOR TESTTurn the ignition on.
With the scan tool, actuate the Viscous/Cabin Heater Relay.
Is the Cabin Heater Relay clicking during the actuator test?
Yes
- Test Complete.
No
- Go To2
2. FUSED B+ CIRCUIT OPEN
NOTE: If the Cabin Heater Relay fuse or fuselink is open, refer to the system schematics for all circuits that are powered by the Cabin Heater Relay fuse or fuselink to determine the cause of the blown fuse/fuselink.
Remove the Cabin Heater Relay.
Using a 12-volt test light connected to ground, probe the Fused B+ circuit in the (cavity 30) Cabin Heater Relay connector .
Does the test light illuminate brightly?
Yes
- Go To3
No
- Repair the Fused B+ (Fuse/Fuselink) circuit for an open.
- Perform the ECM Verification Test Ver. 1 (Refer to 9 - ENGINE - DIAGNOSIS AND TESTING).
3. CABIN HEATER RELAY OUTPUT CIRCUIT SHORTED TO VOLTAGE
Turn the ignition off.
Disconnect the Cabin Heater harness connector.
Turn the ignition on.
Measure the voltage on the (cavity 87) Cabin Heater Relay Output circuit .
Is the voltage above 1.0 volt?
Yes
- Repair the (A119) Cabin Heater Relay Output circuit for a short to voltage.
- Perform the ECM Verification Test Ver. 1 (Refer to 9 - ENGINE - DIAGNOSIS AND TESTING).
No
- Go To4
4. CABIN HEATER RELAY OUTPUT CIRCUIT SHORTED TO GROUND
Measure the resistance between ground and the (cavity 87) Cabin Heater Relay Output circuit.
Is the resistance above 1000 ohms?
Yes
- Go To5
No
- Repair the (K132) Cabin Heater Relay Output circuit for a short to ground. Inspect the fuse or fuselink and replace as necessary.
- Perform the ECM Verification Test Ver. 1 (Refer to 9 - ENGINE - DIAGNOSIS AND TESTING).
5. CABIN HEATER RELAY OUTPUT CIRCUIT OPEN
Connect a jumper wire across Cabin Heater Relay connector (cavities 30 and 87).
Using a 12-volt test light connected to ground, check the (A119) Cabin Heater Relay Output circuit in the Cabin Heater harness connector.
Does the test light illuminate brightly?
Yes
- Go To6
No
- Repair the (A119) Cabin Heater Relay Output circuit for an open.
- Perform the ECM Verification Test Ver. 1 (Refer to 9 - ENGINE - DIAGNOSIS AND TESTING).
6. CABIN HEATER RELAY
If there are no possible causes remaining, view repair.
Repair
- Replace the Cabin Heater Relay.
- Perform the ECM Verification Test Ver. 1 (Refer to 9 - ENGINE - DIAGNOSIS AND TESTING).