B2345 00

WARNING: This page is about a different car, the 2009 GMC Sierra, 2009 GMC Cab & Chassis Sierra, 2009 Chevrolet Silverado, and 2009 Chevrolet Cab & Chassis Silverado. However, it is still accessible from the selected car via links, so may be relevant.

Ignition OFF, disconnect the X1, X4 harness connectors at the MSM.
Test for infinite resistance between the control circuit terminal 14 X1 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 14 X1
  - Driver seat cushion element terminal 11 X1
  - Driver seat back element terminal 1 X1
Test for infinite resistance between the control circuit terminal 6 X1 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 6 X1
  - Passenger seat cushion element terminal 14 X4
  - Passenger seat back element terminal 4 X1
Ignition ON, verify that a test lamp does not illuminate between the control circuit terminal 14 X1 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 14 X1
  - Driver seat cushion element terminal 11 X1
  - Driver seat back element terminal 1 X1
Verify that a test lamp does not illuminate between the control circuit terminal 6 X1 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 6 X1
  - Passenger seat cushion element terminal 14 X4
  - Passenger seat back element terminal 4 X1
If all circuits test normal, replace the MSM.