Circuit/System Testing: Notes
WARNING: This page does not describe the selected car, but rather 8 other vehicles, including the 2007 GMC Yukon XL, 2007 GMC Yukon, 2007 Chevrolet Tahoe, 2007 Chevrolet Suburban, and 2007 Chevrolet Avalanche. However, it is still accessible from the selected car via links, so may be relevant.
B2345 00
- Ignition OFF, disconnect the C1 harness connector at the rear heated seat module.
- Test for infinite resistance between the left seat heating element supply voltage circuit terminal 3 and ground.
- If less than infinite, test the supply voltage circuit and the seat cushion element control circuit for a short to ground.
- Ignition ON, verify that a test lamp does not illuminate between the supply voltage circuit terminal 3 and ground.
- If the test lamp illuminates, test the supply voltage circuit and the seat cushion element control circuit for a short to voltage.
- Test for infinite resistance between the right seat heating element supply voltage circuit terminal 6 and ground.
- If less than infinite, test the supply voltage circuit and the seat cushion element control circuit for a short to ground.
- Ignition ON, verify that a test lamp does not illuminate between the supply voltage circuit terminal 6 and ground.
- If the test lamp illuminates, test the supply voltage circuit and the seat cushion element control circuit for a short to voltage.
- If all circuits test normal, replace the rear heated seat module.
B2345 13
- Disconnect the rear heated seat module connectors C2 and C4.
- Verify the resistance through the faulted seat heat sensor is 850-300K ohms from the signal circuit terminal to the low reference circuit terminal in the harness connectors.
- If less than 850 ohms, replace the seat heater element.
- If the circuits test normal replace the rear heated seat module.