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Home >> GMC >> 2018 >> Acadia Denali, FWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 333 (Power Door Lock System And Release Systems) >> Diagnostic Information and Procedures >> Power Door Locks Malfunction >> 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.

Test 1

    NOTE:

    It may take up to 2 min for all vehicle systems to power down before an accurate ground or low reference circuit continuity test can be performed.

  1. Ignition/Vehicle & All vehicle systems Off
  2. Disconnect the appropriate electrical connector: S13D Door Lock Switch - Driver/S13P Door Lock Switch - Passenger
  3. Test for less than 10 Ω between the test points: Ground circuit terminal 4 & Ground
    • If 10 Ω or greater 
    1. Disconnect Ground Connection
    2. Test for less than 2 Ω between the test points: Ground circuit terminal 4 @ Component harness & Ground Connection
      • 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 
  4. Ignition On/Vehicle In Service Mode
  5. Verify the scan tool parameter: Driver Door Lock Switch or Passenger Door Lock Switch = Inactive
    • If not the specified state 
    1. Ignition/Vehicle Off
    2. Disconnect the electrical connector: X2/X7 @ K9 Body Control Module
    3. Test for infinite resistance between the test points:
      • Signal circuit terminal 2 @ Component harness & Ground
      • Signal circuit terminal 3 @ Component harness & Ground
      • If less than infinite resistance, repair the short to ground on the circuit.
      • If infinite resistance, replace the component: K9 Body Control Module
    • If the specified state 
  6. Connect a 3 A fused jumper wire between the test points: Signal circuit terminal 3 & Ground circuit terminal 4
  7. Verify the scan tool parameter: Driver Door Lock Switch or Passenger Door Lock Switch = Unlock
    • If not the specified state 
    1. Ignition/Vehicle Off & Remove Jumper wire(s)
    2. Disconnect the electrical connector: X2 or X7 @ K9 Body Control Module
    3. Ignition On/Vehicle In Service Mode
    4. Test for less than 1 V between the test points: Signal circuit terminal 3 @ Component harness & Ground
      • If 1 V or greater, repair the short to voltage on the circuit.
      • If less than 1 V
    5. Ignition/Vehicle Off
    6. Test for less than 2 Ω between the test points:
      • Signal circuit terminal 3 @ S13D Door Lock Switch - Driver & Terminal 15 X2 @ Control module harness
      • Signal circuit terminal 3 @ S13P Door Lock Switch - Passenger & Terminal 12 X7 @ Control module harness
      • If 2 Ω or greater, repair the open/high resistance in the circuit.
      • If less than 2 Ω, replace the component: K9 Body Control Module
    • If the specified state 
  8. Connect a 3 A fused jumper wire between the test points: Signal circuit terminal 2 & Ground circuit terminal 4
  9. Verify the scan tool parameter: Driver Door Lock Switch or Passenger Door Lock Switch = Lock
    • If not the specified state 
    1. Ignition/Vehicle Off & Remove Jumper wire(s)
    2. Disconnect the electrical connector: X2 or X7 @ K9 Body Control Module
    3. Ignition On/Vehicle In Service Mode
    4. Test for less than 1 V between the test points: Signal circuit terminal 2 @ Component harness & Ground
      • If 1 V or greater, repair the short to voltage on the circuit.
      • If less than 1 V
    5. Ignition/Vehicle Off
    6. Test for less than 2 Ω between the test points:
      • Signal circuit terminal 2 @ S13D Door Lock Switch - Driver & Terminal 19 X2 @ Control module harness
      • Signal circuit terminal 2 @ S13P Door Lock Switch - Passenger & Terminal 11 X7 @ Control module harness
      • If 2 Ω or greater, repair the open/high resistance in the circuit.
      • If less than 2 Ω, replace the component: K9 Body Control Module
    • If the specified state 
  10. Test or replace the component: S13D Door Lock Switch - Driver/S13P Door Lock Switch - Passenger

Test 2

  1. Ignition/Vehicle Off
  2. Disconnect the electrical connector: A23D Door Latch Assembly - Driver
  3. Connect a test lamp between the test points: Control circuit terminal 7 & Control circuit terminal 8
  4. Ignition On/Vehicle In Service Mode
  5. Operate the component: S13D Door Lock Switch - Driver Lock & Unlock
  6. Verify the test lamp does not turn On and Off.
    • If the test lamp turns On and Off 

      Test or replace the component: A23D Door Latch Assembly - Driver

    • If the test lamp does not turn On and Off 
  7. Ignition/Vehicle Off
  8. Disconnect the electrical connector: X6 @ K9 Body Control Module
  9. Test for less than 2 Ω between the test points:
    • Control circuit terminal 7 @ A23D Door Latch Assembly - Driver & Terminal 1 X6 @ Control module harness
    • Control circuit terminal 8 @ A23D Door Latch Assembly - Driver & Terminal 4 X6 @ Control module harness
    • If 2 Ω or greater, repair the open/high resistance in the circuit.
    • If less than 2 Ω 
  10. Test or replace the component: K9 Body Control Module

Test 3

  1. Ignition/Vehicle & All vehicle systems Off
  2. Disconnect the appropriate electrical connector:
    • A23LR Door Latch Assembly - Left Rear
    • A23P Door Latch Assembly - Passenger
    • A23RR Door Latch Assembly - Right Rear
  3. Connect a test lamp between the test points:
    • A23P Door Latch Assembly - Passenger Control circuit terminal 9 & Control circuit terminal 8
    • A23LR Door Latch Assembly - Left Rear Control circuit terminal 7 & Control circuit terminal 8
    • A23RR Door Latch Assembly - Right Rear Control circuit terminal 9 & Control circuit terminal 8
  4. Ignition On/Vehicle In Service Mode
  5. Operate the component: S13D Door Lock Switch - Driver Lock & Unlock
  6. Verify the test lamp does not turn On and Off.
    • If the test lamp turns On and Off 

      Test or replace the component: A23 Door Latch Assembly

    • If the test lamp does not turn On and Off 
  7. Ignition/Vehicle Off
  8. Disconnect the electrical connector: X6 @ K9 Body Control Module
  9. Ignition On/Vehicle In Service Mode
  10. Test for less than 2 Ω between the test points:
    • Control circuit terminal 7 @ A23LR Door Latch Assembly - Left Rear & Terminal 2 X6 @ Control module harness
    • Control circuit terminal 8 @ A23LR Door Latch Assembly - Left Rear & Terminal 4 X6 @ Control module harness
    • Control circuit terminal 8 @ A23P Door Latch Assembly - Passenger & Terminal 4 X6 @ Control module harness
    • Control circuit terminal 9 @ A23P Door Latch Assembly - Passenger & Terminal 2 X6 @ Control module harness
    • Control circuit terminal 8 @ A23RR Door Latch Assembly - Right Rear & Terminal 4 X6 @ Control module harness
    • Control circuit terminal 9 @ A23RR Door Latch Assembly - Right Rear & Terminal 2 X6 @ Control module harness
    • If 2 Ω or greater, repair the open/high resistance in the circuit.
    • If less than 2 Ω 
  11. Test or replace the component: K9 Body Control Module

Test 4

    NOTE:

    It may take up to 2 min for all vehicle systems to power down before an accurate ground or low reference circuit continuity test can be performed.

  1. Ignition/Vehicle Off
  2. Disconnect the electrical connector: X2 & X6 @ K9 Body Control Module
  3. Test for less than 10 Ω between the test points: Ground circuit terminal 3 X6 & Ground
    • If 10 Ω or greater 
    1. Disconnect Ground Connection
    2. Test for less than 2 Ω between the test points: Ground circuit terminal 3 X6 & Ground Connection
      • 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 
  4. Ignition On/Vehicle In Service Mode
  5. Verify a test lamp turns On between the test points: B+ circuit terminal 4 X2 & Ground
    • If the test lamp does not turn On and the circuit fuse is OK 
    1. Ignition/Vehicle Off & Remove » Test lamp
    2. Test for less than 2 Ω between the test points: B+ circuit terminal 4 X2 & Output terminal @ Fuse
      • 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 does not turn On and the circuit fuse is open 
    1. Ignition/Vehicle Off & Remove Test lamp
    2. Disconnect the electrical connector:
      • A23D Door Latch Assembly - Driver
      • A23LR Door Latch Assembly - Left Rear
      • A23P Door Latch Assembly - Passenger
      • A23RR Door Latch Assembly - Right Rear
    3. Test for infinite resistance between the test points:
      • Control circuit terminal 1 X6 @ K9 Body Control Module & Ground
      • Control circuit terminal 2 X6 @ K9 Body Control Module & Ground
      • Control circuit terminal 4 X6 @ K9 Body Control Module & Ground
      • If less than infinite resistance, repair the short to ground on the circuit.
      • If infinite resistance, replace the component: A23 Door Latch Assembly
    • If the test lamp turns On 
  6. Ignition/Vehicle Off
  7. Connect the electrical connector: X2 @ K9 Body Control Module
  8. Ignition On/Vehicle In Service Mode
  9. Test for less than 1 V between the test points:
    • Control circuit terminal 1 X6 @ K9 Body Control Module & Ground
    • Control circuit terminal 2 X6 @ K9 Body Control Module & Ground
    • Control circuit terminal 4 X6 @ K9 Body Control Module & Ground
    • If greater than 1 V 

      Repair the short to voltage on the circuit.

    • If 1 V or less 
  10. Ignition/Vehicle Off
  11. Test for infinite resistance between the test points:
    • Control circuit terminal 1 X6 @ K9 Body Control Module & Ground
    • Control circuit terminal 2 X6 @ K9 Body Control Module & Ground
    • Control circuit terminal 4 X6 @ K9 Body Control Module & Ground
    • If less than infinite resistance 

      Repair the short to ground on the circuit.

    • If infinite resistance 
  12. Replace the component: K9 Body Control Module
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