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Home >> GMC >> 2018 >> Acadia Denali, FWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 272 (Power Seat System) >> Diagnostic Information and Procedures >> Power Seat Malfunction (Driver or Passenger Seat Sedan without Memory A45) >> Component Testing

Component Testing

WARNING: This page is about a different car, the 2017 Cadillac ATS. However, it is still accessible from the selected car via links, so may be relevant.

Seat Adjuster Switch Test

  1. Ignition OFF, disconnect the harness connector at the S64 Seat Adjuster Switch.
  2. Test for infinite resistance between the B+ terminal and each control terminal with the switch in the open position.
    • If less than infinite resistance 

      Replace the S64 Seat Adjuster Switch.

    • If infinite resistance 
  3. Test for less than 2 Ω between the B+ terminal and each control terminal with the appropriate switch in the closed position.
    • If 2 Ω or greater 

      Replace the S64 Seat Adjuster Switch.

    • If less than 2 Ω 
  4. Test for less than 2 Ω between the ground terminal and each control terminal with the switch in the open position.
    • If 2 Ω or greater 

      Replace the S64 Seat Adjuster Switch.

    • If less than 2 Ω 
  5. All OK.

Seat Motor

  1. Ignition OFF, disconnect the harness connector at the appropriate seat motor listed below:
    • M51 Seat Horizontal Motor
    • M50 Seat Front Vertical Motor (with 8-way seat)
    • M55 Seat Rear Vertical Motor (with 8-way seat)
    • M57 Seat Vertical Motor (with 6-way seat)
    • M56 Seat Recline Motor
  2. NOTE:

    When performing the following tests, make sure that the seat is not already in the position the test is attempting to produce.

  3. Install a 30 A fused jumper wire between control terminal 1 and 12 V.
  4. Momentarily install a jumper wire between control terminal 3 and ground. The seat motor should momentarily perform the appropriate FORWARD/ REARWARD/ UP/ DOWN function.
    • If the motor does not perform the FORWARD/ REARWARD/ UP/ DOWN function 

      Replace the motor.

    • If the motor performs the FORWARD/ REARWARD/ UP/ DOWN function 
  5. Reverse the jumper wires; the motor should perform FORWARD/ REARWARD/ UP/ DOWN function.
    • If the motor does not perform the FORWARD/ REARWARD/ UP/ DOWN function 

      Replace the motor.

    • If the motor performs the FORWARD/ REARWARD/ UP/ DOWN function 
  6. All OK.