Enclave FWD V6-3.6L (2008)
7. Connect the harness connector X2 at the rear window defogger grid.
8. Ignition ON, connect a 40A fused jumper wire between the B+ circuit terminal 87 and the control circuit terminal 30. Verify the rear window
defogger grid is activated.
^
If the rear window defogger grid does not activate, test the control circuit for an open/high resistance. If the circuit tests normal, test or replace
the rear window defogger grid.
9. Connect a test lamp between the control circuit terminal 86 and the ground circuit terminal 85.
10. Command the rear defogger grid ON and OFF with a scan tool. The test lamp should turn ON and OFF when changing between the commanded
states
^
If the test lamp is always ON, test the control circuit for a short to voltage. If the circuit tests normal, replace the HVAC control module.
^
If the test lamp is always OFF, test the control circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the
HVAC control module.
11. If all circuits test normal, test or replace the RR DEFOG relay
Component Testing
Relay Test
1. Ignition OFF, disconnect the RR DEFOG relay.
2. Test for 60-180 ohms of resistance between terminals 85 and 86.
^
If the resistance is not within the specified range, replace the relay.
3. Test for infinite resistance between the following terminals:
*
30 and 86
*
30 and 87
*
30 and 85
*
85 and 87
^
If not the specified value, replace the relay.
4. Install a 25-amp fused jumper wire between relay terminal 85 and 12 volts. Install a jumper wire between relay terminal 86 and ground. Test for
less than 2 ohms of resistance between terminals 30 and 87.
^
If greater than the specified range, replace the relay.
Repair Instructions
Perform the Diagnostic Repair Verification after completing the diagnostic procedure. See: Powertrain Management/Computers and Control
Systems/Testing and Inspection/Diagnostic Trouble Code Tests and Associated Procedures/Verification Tests and Procedures
*
HVAC Control Module Replacement for HVAC control module replacement
*
Liftgate Window Replacement
*
Relay Replacement (Attached to Wire Harness) Relay Replacement (Within an Electrical Center)
