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.

Ignition/Vehicle Off
Disconnect the electrical connector: M30 Liftgate Latch
Ignition On/Vehicle In Service Mode
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 2 @ 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
Connect a 3 A fused jumper wire between the test points: Signal circuit terminal 2 & Ground circuit terminal 1
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 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 @ Component harness & Terminal 5 X6 @ 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
Test or replace the component: M30 Liftgate Latch