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Home >> GMC >> 2021 >> Terrain SL >> Repair and Diagnosis >> Body & Frame >> Body, Cab Control Systems >> Vehicle Access System >> Diagnostic Information and Procedures >> Power Door Locks Malfunction >> Circuit/System Verification

Circuit/System Verification

  1. Ignition - On / Vehicle - In Service Mode
  2. Verify the scan tool parameter: Driver Door Lock Switch = Inactive
    • If not the specified state 

      Refer to: Circuit/System Testing - Test 1

    • Go to next step: If the specified state 
  3. Operate the component: S13D Door Lock Switch - Driver - Lock Switch & Unlock Switch

    Verify the scan tool parameter: Driver Door Lock Switch = Lock & Unlock

    • If not the specified state 

      Refer to: Circuit/System Testing - Test 1

    • Go to next step: If the specified state 
  4. Verify the scan tool parameter: Passenger Door Lock Switch = Inactive
    • If not the specified state 

      Refer to: Circuit/System Testing - Test 1

    • Go to next step: If the specified state 
  5. Operate the component: S13P Door Lock Switch - Passenger - Lock Switch & Unlock Switch

    Verify the scan tool parameter: Passenger Door Lock Switch = Lock & Unlock

    • If not the specified state 

      Refer to: Circuit/System Testing - Test 1

    • Go to next step: If the specified state 
  6. Operate the component: S13D Door Lock Switch - Driver - Lock Switch & Unlock Switch

    Verify the component works as specified:

    • A23D Door Latch Assembly - Driver = Lock & Unlock
    • A23LR Door Latch Assembly - Left Rear = Lock & Unlock
    • A23P Door Latch Assembly - Passenger = Lock & Unlock
    • A23RR Door Latch Assembly - Right Rear = Lock & Unlock
    • { A23D Door Latch Assembly - Driver } If the component does not activate 

      Refer to: Circuit/System Testing - Test 2

    • { A23LR Door Latch Assembly - Left Rear } If the component does not activate 

      Refer to: Circuit/System Testing - Test 3

    • { A23P Door Latch Assembly - Passenger } If the component does not activate 

      Refer to: Circuit/System Testing - Test 3

    • { A23RR Door Latch Assembly - Right Rear } If the component does not activate 

      Refer to: Circuit/System Testing - Test 3

    • If none of the components operate 

      Refer to: Circuit/System Testing - Test 4

    • Go to next step: If all functions work properly 
  7. All OK.