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Home >> GMC >> 2018 >> Acadia Denali, FWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 301 (Power Seat System) >> Diagnostic Information and Procedures >> Power Seat Malfunction (Without Memory AAB) >> Circuit/System Testing

Circuit/System Testing

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

Seat Adjuster Switch Circuit Test

  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 10 Ω between the ground circuit terminal B and ground.
    • 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 B+ circuit terminal E and ground.
    • 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
    • M55 Seat Rear Vertical Motor
    • 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 S64 Seat Adjuster Switch.
    • If the test lamp does not turn ON 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 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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