Traverse FWD V6-3.6L (2009)
3. Command the Rear Defog Request ON and OFF with a scan tool. The rear window defogger should turn ON and OFF when changing between the
commanded states.
Circuit/System Testing
1. Ignition OFF, disconnect the RR DEFOG relay.
2. Test for less than 1 ohm between the ground circuit terminal 85 and ground.
‹› If greater than the specified range, test the ground circuit for an open/high resistance.
3. Ignition ON, verify that a test lamp does not illuminate between the control circuit terminal 30 and ground.
‹› If the test lamp illuminates, test the control circuit for a short to voltage.
4. Verify that a test lamp illuminates between the B+ circuit terminal 87 and ground.
‹› If the test lamp does not illuminate, test the B+ circuit for a short to ground or an open/high resistance.
5. Ignition OFF, disconnect the X2 harness connector at the defogger grid.
6. Test for less than 5 ohms between the ground circuit terminal A and ground.
‹› If greater than the specified range, test the ground circuit for an open/high resistance.
7. Connect the harness connector at the 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 defogger grid is
activated.
‹› If the defogger grid does not activate, test the control circuit for a short to ground or an open/high resistance. If the circuit tests normal, test or
replace the defogger grid.
9. Connect a test lamp between the control circuit terminal 86 and the ground circuit terminal 85.
10. Command the Rear Defog Request 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 between terminals 85 and 86.
‹› If 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 30-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 between terminals 30 and 87.
‹› If greater than the specified range, replace the relay.
Rear Window Defogger Grid Test
1. Ignition ON, turn on the rear window defogger.
2. Verify that a test lamp illuminates between each rear window defogger grid line and ground. The test lamp should be off when testing at the