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Home >> Buick >> 2019 >> Envision Base >> Repair and Diagnosis >> Body & Frame >> Body, Cab Control Systems >> Vehicle Access System >> Diagnostic Information and Procedures >> Power Door Child Lock Malfunction >> Circuit/System Testing

Circuit/System Testing

Test 1

  1. Ignition/Vehicle & All vehicle systems - Off
  2. Disconnect the appropriate electrical connector:
    • A23LR Door Latch Assembly - Left Rear
    • A23RR Door Latch Assembly - Right Rear
  3. Connect a test lamp between the test points:
    • A23LR Door Latch Assembly - Left Rear: Control circuit terminal 8 & Control circuit terminal 9
    • A23RR Door Latch Assembly - Right Rear: Control circuit terminal 8 & Control circuit terminal 7
  4. Ignition - On / Vehicle - In Service Mode
  5. Perform the scan tool control function: Child Security Lock Motors - On & Off

    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

    • Go to next step: If the test lamp does not turn On and Off 
  6. Test or replace the component: X51A Fuse Block - Instrument Panel

Test 2

  1. Ignition/Vehicle - Off
  2. Disconnect the electrical connector: X4 @ K9 Body Control Module
  3. Ignition - On / Vehicle - In Service Mode
  4. Test for less than 1 V between the test points: Control circuit terminal 10 X4 @ Control module harness & Ground
    • If 1 V or greater 

      Replace the component: X51A Fuse Block - Instrument Panel

    • Go to next step: If less than 1 V 
  5. Momentarily connect a 3 A fused jumper wire between the test points: Control circuit terminal 10 X4 & B+
  6. Verify a click can be heard or felt at the component when the scan tool control function was commanded: KR113 Child Security Lock Disable Relay
    • If a click cannot be heard or felt 

      Replace the component: X51A Fuse Block - Instrument Panel

    • Go to next step: If a click can be heard or felt 
  7. Replace the component: K9 Body Control Module

Test 3

    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:
    • A23LR Door Latch Assembly - Left Rear
    • A23RR Door Latch Assembly - Right Rear
  3. Test for less than 10 ohms between the test points: Ground circuit terminal 3 & Ground
    • If 10 ohms or greater 
    1. Ground Connection - Disconnect
    2. Test for less than 2 ohms between the test points: Ground circuit terminal 3 @ Component harness & Ground Connection
      • If 2 ohms or greater - Repair the open/high resistance in the circuit.
      • If less than 2 ohms - Repair the open/high resistance in the ground connection.
    • Go to next step: If less than 10 ohms 
  4. Ignition - On / Vehicle - In Service Mode
  5. Verify the scan tool parameter:
    • Left Rear Child Security Lock Switch = Inactive
    • Right Rear Child Security Lock Switch = Inactive
    • If not the specified state 
    1. Ignition/Vehicle - Off
    2. Disconnect the electrical connector: K9 Body Control Module
    3. Test for infinite resistance between the test points:
      • Signal circuit terminal 2 @ A23LR Door Latch Assembly - Left Rear & Ground
      • Signal circuit terminal 4 @ A23RR Door Latch Assembly - Right Rear & Ground
      • If less than infinite resistance - Repair the short to ground on the circuit.
      • If infinite resistance - Replace the component: K9 Body Control Module
    • Go to next step: If the specified state 
  6. Connect a 3 A fused jumper wire between the test points:
    • A23LR Door Latch Assembly - Left Rear: Signal circuit terminal 2 & Ground circuit terminal 3
    • A23RR Door Latch Assembly - Right Rear: Signal circuit terminal 4 & Ground circuit terminal 3
  7. Verify the scan tool parameter:
    • Left Rear Child Security Lock Switch = Active
    • Right Rear Child Security Lock Switch = Active
    • If not the specified state 
    1. Ignition/Vehicle - Off & Remove - Jumper wire (s)
    2. Disconnect the electrical connector: 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 @ A23LR Door Latch Assembly - Left Rear & Ground
      • Signal circuit terminal 4 @ A23RR Door Latch Assembly - Right Rear & Ground
      • If 1 V or greater - Repair the short to voltage on the circuit.
      • Go to next step: If less than 1 V
    5. Ignition/Vehicle - Off
    6. Test for less than 2 ohms between the test points:
      • Signal circuit terminal 2 @ A23LR Door Latch Assembly - Left Rear & Terminal 12 X7 @ Control module harness
      • Signal circuit terminal 4 @ A23RR Door Latch Assembly - Right Rear & Terminal 18 X7 @ Control module harness
      • If 2 ohms or greater - Repair the open/high resistance in the circuit.
      • If less than 2 ohms - Replace the component: K9 Body Control Module
    • Go to next step: If the specified state 
  8. Test or replace the component: A23LR Door Latch Assembly - Left Rear/A23RR Door Latch Assembly - Right Rear
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