Circuit/System Testing
WARNING: This page does not describe the selected car, but rather 8 other vehicles, including the 2012 GMC Yukon XL, 2012 GMC Yukon, 2012 Chevrolet Tahoe, 2012 Chevrolet Suburban, and 2012 Chevrolet Avalanche. However, it is still accessible from the selected car via links, so may be relevant.
B2345 00
- Ignition OFF, disconnect the X1 harness connector at the HSM.
- Test for infinite resistance between the control circuit terminal 6 and ground.
- If not the specified value, test the control circuits listed below for a short to ground:
- Driver seat cushion and seat back terminal 6
- Driver seat cushion element terminal 5
- Driver seat back element terminal 1
- Test for infinite resistance between the control circuit terminal 3 and ground.
- If not the specified value, test the control circuits listed below for a short to ground:
- Passenger seat cushion and seat back terminal 3
- Passenger seat cushion element terminal 2
- Passenger seat back element terminal 4
- Ignition ON, verify that a test lamp does not illuminate between the control circuit terminal 6 and ground.
- If the test lamp illuminates, test the control circuits listed below for a short to voltage:
- Driver seat cushion and seat back terminal 6
- Driver seat cushion element terminal 5
- Driver seat back element terminal 1
- Verify that a test lamp does not illuminate between the supply voltage circuit terminal 3 and ground.
- If the test lamp illuminates, test the control circuits listed below for a short to voltage:
- Passenger seat cushion and seat back terminal 3
- Passenger seat cushion element terminal 2
- Passenger seat back element terminal 4
- If all circuits test normal, replace the HSM.
B2345 13
- Ignition OFF, disconnect the X2, X4 harness connectors at the HSM.
- Test for greater than 850 ohms between the signal and the low reference circuits listed below:
- Driver seat cushion terminal 9 X4 and terminal 6 X2
- Passenger seat cushion terminal 20 X4 and terminal 8 X2
- If less than the specified value, test for a short between the signal and low reference circuits. If the circuits test normal, replace the appropriate seat cushion heater element/temperature sensor.
- Test for greater than 850 ohms between the signal and the low reference circuits listed below:
- Driver seat back terminal 19 X4 and terminal 5 X2
- Passenger seat back terminal 10 X4 and terminal 7 X2
- If less than the specified value, test for a short between the signal and low reference circuits. If the circuits test normal, replace the appropriate seat back heater element/temperature sensor.
- If all circuits test normal, replace the HSM.
B2345 42 or B2345 4B
If either DTC is set, replace the HSM.