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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) >> Circuit/System Testing

Circuit/System 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 Circuit Test

  1. Ignition OFF, disconnect the X1 harness connector at the appropriate seat adjuster switch listed below:
    • S64D Seat Adjuster Switch - Driver
    • S64P Seat Adjuster Switch - Passenger
  2. Test for less than 10 Ω between the appropriate ground circuit terminal listed below and ground.
    • Driver seat switch terminal 2
    • Passenger seat switch terminal 5
    • If 10 Ω or greater 
    1. Ignition OFF.
    2. Test for less than 2 Ω in the ground circuit end to end.
      • If 2 Ω or greater, repair the open/high resistance in the circuit.
      • If less than 2 Ω, repair the open/high resistance in the ground connection.
    • If less than 10 Ω 
  3. Ignition ON.
  4. Verify a test lamp illuminates between the appropriate B+ circuit terminal listed below and ground.
    • Driver seat terminal 6
    • Passenger seat terminal 10
    • If the test lamp does not illuminate 
    1. Ignition OFF, remove the test lamp.
    2. Test for infinite resistance between the B+ circuit and ground.
      • If less than infinite resistance, repair the short to ground on the circuit.
      • If infinite resistance
    3. Test for less than 2 Ω in the B+ circuit end to end.
      • If 2 Ω or greater, repair the open/high resistance in the circuit.
      • If less than 2 Ω, verify the fuse is OK and there is voltage at the fuse
    • If the test lamp illuminates 
  5. Test or replace the S64 Seat Adjuster Switch.

Seat Motor Circuit Test

  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. Connect a test lamp between control circuit terminal 1 and control circuit terminal 3, ignition ON.
  3. Verify the test lamp turns ON when commanding the seat motor Up and Down or Forward and Rearward using the seat adjuster switch.
    • If the test lamp remains OFF during either of the commands 
    1. Ignition OFF, disconnect the harness connector at the S64 Seat Adjuster Switch.
    2. Test for less than 2 Ω in each control circuit end to end.
      • If 2 Ω or greater, repair the open/high resistance in the circuit.
      • If less than 2 Ω, test or replace the S64 Seat Adjuster Switch
    • If the test lamp turns ON during each of the commands 
  4. Test or replace the seat motor.
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