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Circuit/System Testing

WARNING: This page is about a different car, the 2019 Buick Cascada, 2018 Buick Cascada, and 2017 Buick Cascada. 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: A23 Door Latch Assembly
  3. Test for less than 10 ohms between the test points:
    • Ground circuit terminal 8@A23D Door Latch Assembly - Driver & Ground
    • Ground circuit terminal 3@A23P Door Latch Assembly - Passenger & Ground
    • If 10 ohms or greater 
    1. Ground Connection - Disconnect
    2. Test for less than 2 ohms between the test points:
      • Ground circuit terminal 8@A23D Door Latch Assembly - Driver & Ground Connection
      • Ground circuit terminal 3@A23P Door Latch Assembly - Passenger & 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: Door Ajar Switch = Inactive
    • If not the specified state 
    1. Ignition/Vehicle - Off
    2. Disconnect the appropriate electrical connector:
      • M74D Window Motor - Driver
      • M74P Window Motor - Passenger
    3. Test for infinite resistance between the test points:
      • Signal circuit terminal 6@A23D Door Latch Assembly - Driver & Ground
      • Signal circuit terminal 1@A23P Door Latch Assembly - Passenger & Ground
      • If less than infinite resistance - Repair the short to ground on the circuit.
      • If infinite resistance - Replace the component:
    • M74D Window Motor - Driver
    • M74P Window Motor - Passenger
    • Go to next step: If the specified state 
  6. Connect a 3 A fused jumper wire between the test points:
    • Signal circuit terminal 6 & Ground circuit terminal 8@A23D Door Latch Assembly - Driver
    • Signal circuit terminal 1 & Ground circuit terminal 3@A23P Door Latch Assembly - Passenger
  7. Verify the scan tool parameter: Door Ajar Switch=Active
    • If not the specified state 
    1. Ignition/Vehicle - Off & Remove - Jumper wire(s)
    2. Disconnect the electrical connector:
      • M74D Window Motor - Driver
      • M74P Window Motor - Passenger
    3. Ignition - On / Vehicle - In Service Mode
    4. Test for less than 1 V between the test points:
      • Signal circuit terminal 6@A23D Door Latch Assembly - Driver & Ground
      • Signal circuit terminal 1@A23P Door Latch Assembly - Passenger & 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 6@A23D Door Latch Assembly - Driver & Signal circuit terminal 6@M74D Window Motor - Driver
      • Signal circuit terminal 1@A23P Door Latch Assembly - Passenger & Signal circuit terminal 6@M74P Window Motor - Passenger
      • If 2 ohms or greater - Repair the open/high resistance in the circuit.
      • If less than 2 ohms - Replace the component:
      • M74D Window Motor - Driver
      • M74P Window Motor - Passenger
    • Go to next step: If the specified state 
  8. Test or replace the component: A23 Door Latch Assembly

Test 2

  1. Ignition/Vehicle - Off
  2. Disconnect the electrical connector: M30 Liftgate Latch
  3. Ignition - On / Vehicle - In Service Mode
  4. Verify the scan tool parameter: Rear Closure Ajar 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 4@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
    • Go to next step: If the specified state 
  5. Connect a 3 A fused jumper wire between the test points: Signal circuit terminal 4 & Ground circuit terminal 2
  6. Verify the scan tool parameter: Rear Closure Ajar 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 4@Component harness & 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 4@Component harness & Terminal 5 X6@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 
  7. Test or replace the component: M30 Liftgate Latch
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