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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 (With 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.

Driver Seat Adjuster Switch Circuit Test

  1. Ignition OFF and all vehicle systems OFF, disconnect the X1 harness connector at the S64D Seat Adjuster Switch - Driver. 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 E 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. Install a 3 A fused jumper wire between the ground circuit terminal E and the appropriate signal circuit terminal listed below, ignition ON.
    • Front vertical up switch terminal A
    • Front vertical down switch terminal K
    • Rear vertical up switch terminal F
    • Rear vertical down switch terminal J
    • Horizontal forward switch terminal D
    • Horizontal rearward switch terminal C
    • Recline forward switch terminal H
    • Recline rearward switch terminal G
  4. Verify the appropriate scan tool seat switch parameter is Forward/Rearward or UP/Down.
    • If not Forward/Rearward or UP/Down 
    1. Ignition OFF, disconnect the X5 harness connector at the K40 Seat Memory Control Module, ignition ON.
    2. Test for less than 1 V between the signal circuit and ground.
      • If 1 V or greater, repair the short to voltage on the circuit.
      • If less than 1 V
    3. Ignition OFF.
    4. Test for less than 2 Ω in the signal circuit end to end.
      • If 2 Ω or greater, repair the open/high resistance in the circuit.
      • If less than 2 Ω, replace the K40 Seat Memory Control Module.
    • If Forward/Rearward or UP/Down 
  5. Test or replace the S64D Seat Adjuster Switch - Driver.

Seat Motor Control Circuit Test

  1. Ignition OFF, disconnect the X1 harness connector at the K40 Seat Memory Control Module, ignition ON.
  2. Verify that a test lamp illuminates between each B+ circuit terminal listed below and ground:
    • Terminal 1
    • Terminal 2
    • If the test lamp does not illuminate and the circuit fuse is good. 
    1. Ignition OFF.
    2. 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 circuit fuse is OK and there is voltage at the fuse.
    • If the test lamp does not illuminate and the circuit fuse is open. 
    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, replace the K40 Seat Memory Control Module.
    • If the test lamp illuminates. 
  3. Ignition OFF, connect the X1 harness connector at the K40 Seat Memory Control Module and disconnect the harness connector at the appropriate seat motor listed below:
    • M50D Seat Front Vertical Motor - Driver
    • M55D Seat Rear Vertical Motor - Driver
    • M51D Seat Horizontal Motor - Driver
    • M56D Seat Recline Motor - Driver
  4. Connect a test lamp between control circuit terminal 1 and control circuit terminal 3, ignition ON.
    5. NOTE:

    Once a seat motor is commanded On using the scan tool, the seat function may not work using the seat adjuster switch until you back out of the scan tool Control Functions menu.

  5. Verify the test lamp turns ON when commanding the seat motor in the Up/Down or Forward/Rearward states with a scan tool.
    • If the test lamp remains OFF during either of the commands 
    1. Ignition OFF, disconnect the X3 harness connector at the K40 Seat Memory Control Module.
    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, replace the K40 Seat Memory Control Module.
    • If the test lamp turns ON during each of the commands 
  6. Test or replace the seat motor.
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