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Home >> GMC >> 2018 >> Acadia Denali, FWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 29 (Power Door Lock System And Release Systems) >> Diagnostic Information and Procedures >> Door Lock Indicator Malfunction >> Circuit/System Testing

Circuit/System Testing

WARNING: This page is about a different car, the 2016 Cadillac ATS. However, it is still accessible from the selected car via links, so may be relevant.

Driver Door Lock Indicator Malfunction

  1. Ignition OFF, disconnect the harness connector at the S13D Door Lock Switch-Driver. Ignition ON
  2. Connect a test lamp between the control circuit terminal 6 and B+.
  3. Verify the test lamp turns ON and OFF when commanding the All Doors Lock/Unlock with a scan tool.
    • If the test lamp is always OFF 
    1. Ignition OFF, remove the test lamp, disconnect the harness connector at the A23D Door Latch Assembly-Driver.
    2. Test for infinite resistance between the 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 1 V between the control circuit and ground.
      • If 1 V or greater, repair the short to voltage on the circuit.
      • If less than 1 V, replace the A23D Door Latch Assembly-Driver.
    • If the test lamp is always ON 
    1. Ignition OFF, remove the test lamp, disconnect the harness connector at the A23D Door Latch Assembly-Driver.
    2. Test for infinite resistance between the control circuit and ground.
      • If less than infinite resistance, repair the short to ground on the circuit.
      • If infinite resistance, replace the A23D Door Latch Assembly-Driver
    • If the test lamp turns ON and OFF 
  4. Test or replace the S13D Door Lock Switch-Driver.

Passenger Door Lock Indicator Malfunction

  1. Ignition OFF, disconnect the harness connector at the S13P Door Lock Switch-Passenger. Ignition ON
  2. Connect a test lamp between the control circuit terminal 6 and B+.
  3. Verify the test lamp turns ON and OFF when commanding the All Doors Lock/Unlock with a scan tool.
    • If the test lamp is always OFF 
    1. Ignition OFF, remove the test lamp, disconnect the harness connector at the A23P Door Latch Assembly-Passenger.
    2. Test for infinite resistance between the 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 1 V between the control circuit and ground.
      • If 1 V or greater, repair the short to voltage on the circuit.
      • If less than 1 V, replace the A23P Door Latch Assembly-Passenger.
    • If the test lamp is always ON 
    1. Ignition OFF, remove the test lamp, disconnect the harness connector at the A23P Door Latch Assembly-Passenger.
    2. Test for infinite resistance between the control circuit and ground.
      • If less than infinite resistance, repair the short to ground on the circuit.
      • If infinite resistance, replace the A23P Door Latch Assembly-Passenger
    • If the test lamp turns ON and OFF 
  4. Test or replace the S13P Door Lock Switch-Passenger.

Both Door Lock Indicators Inoperative

  1. Ignition OFF, disconnect the harness connector at the S13D Door Lock Switch-Driver and the S13P Door Lock Switch-Passenger. Ignition ON
  2. Connect a test lamp between the control circuit terminal 5 and ground.
  3. Verify the test lamp turns ON when using the S36 Instrument Panel Dimmer Switch to it's maximum setting.
    • If the test lamp is OFF 
    1. Ignition OFF, remove the test lamp, disconnect the X1 harness connector at the K9 Body Control Module.
    2. Test for infinite resistance between the 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 the 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 K9 Body Control Module.
    • If the test lamp is ON 
  4. Test or replace the S13D Door Lock Switch-Driver and the S13P Door Lock Switch-Passenger.
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