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Home >> Buick >> 2015 >> Regal GS, AWD >> Repair and Diagnosis >> Body & Frame >> Seats >> Power Seat System >> Diagnostic Information and Procedures >> Power Seat Malfunction (2-Way without Memory A45) >> Circuit/System Testing

Circuit/System Testing

  1. Ignition OFF and all vehicle systems OFF, disconnect the harness connector at the appropriate S64 Seat Adjuster Switch. It may take up to 2 min for all vehicle systems to power down.
  2. Test for less than 10Ω between each ground circuit terminal listed below and ground:
    • terminal A
    • terminal C
    • If 10Ω or greater 
    1. Ignition OFF.
    2. Test for less than 2Ω in the ground circuit end to end.
      • If 2Ω or greater, repair the open/high resistance in the circuit.
      • If less than 2Ω, repair the open/high resistance in the ground connection.
    • If less than 10Ω 
  3. Ignition ON.
  4. Verify a test lamp illuminates between the B+ circuit terminal D and ground.
    • If the test lamp does not illuminate 
    1. Ignition OFF
    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 2Ω in the B+ circuit end to end.
      • If 2Ω or greater, repair the open/high resistance in the circuit.
      • If less than 2Ω, verify the circuit breaker is not open and there is voltage at the circuit breaker.
    • If the test lamp illuminates 
  5. Ignition OFF, connect the harness connector at the S64 Seat Adjuster Switch and disconnect the harness connector at the M55 Seat Rear Vertical Motor.
  6. Connect a test lamp between control circuit terminal 1 and control circuit terminal 5, ignition ON.
  7. Verify the test lamp illuminates when commanding the M55 Seat Rear Vertical Motor Up and Down using the seat adjuster switch.
    • If the test lamp does not illuminate during either of the commands 
    1. Ignition OFF, disconnect the harness connector at the S64 Seat Adjuster Switch.
    2. Test for infinite resistance between each control circuit and ground.
      • If less than infinite resistance, repair the short to ground on the circuit.
      • If infinite resistance
    3. Test for less than 2Ω in each control circuit end to end.
      • If 2Ω or greater, repair the open/high resistance in the circuit.
      • If less than 2Ω, test or replace the S64 Seat Adjuster Switch.
    • If the test lamp illuminates during each of the commands 
  8. Test or replace the M55 Seat Rear Vertical Motor.
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