Circuit/System Testing

WARNING: This page is about a different car, the 2017 Cadillac ATS. However, it is still accessible from the selected car via links, so may be relevant.

Ignition/Vehicle » Off
Disconnect the electrical connector:M40 Rear Compartment Lid 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 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
- If the specified state
Connect a 3 A fused jumper wire between the test points:Signal circuit terminal 4&Ground circuit terminal 2
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.
  - If less than 1 V
5. Ignition/Vehicle » Off
6. Test for less than 2 Ω between the test points:Signal circuit terminal 4@Component harness&Terminal 5X6@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:M40 Rear Compartment Lid Latch