Circuit/System Testing

WARNING: This page is about a different car, the 2020 Cadillac CT4. However, it is still accessible from the selected car via links, so may be relevant.

Ignition/Vehicle & All vehicle systems - Off
Disconnect the appropriate electrical connector:
- A23LR Rear Side Door Latch-Left
- A23RR Rear Side Door Latch-Right
Connect a test lamp between the test points:
- Control circuit terminal 8 & Control circuit terminal 9 @ A23LR Rear Side Door Latch-Left
- Control circuit terminal 7 & Control circuit terminal 8 @ A23RR Rear Side Door Latch-Right
Engage and disengage the child door locks by pressing the child lock switch on the S79D Front Side Door Window Control Switch-Driver
Verify the test lamp state:

Not used=Test lamp Off

Power door child lockout enabled=Test lamp flashes On and remains Off

Power door child lockout disabled=Test lamp flashes On and remains Off
- If the test lamp is always OFF
1. Ignition OFF, remove the test lamp, disconnect the harness connector at the K9 Body Control Module
2. Test for infinite resistance between the control terminal 3266 and ground.
  - If less than infinite resistance, repair the short to ground on the circuit.
  - Go to next step: If infinite resistance
3. Test for less than 2 Ω in the control terminal 3266 end to end.
  - If 2 Ω or greater, repair the open/high resistance in the circuit.
  - If less than 2 Ω, replace the K9 Body Control Module
- If the test lamp is always ON
1. Ignition OFF, remove the test lamp, disconnect the harness connector at the K9 Body Control Module, ignition ON.
2. Test for less than 1 V between the control terminal 3266 and ground.
  - If 1 V or greater, repair the short to voltage on the circuit.
  - If less than 1 V, replace the K9 Body Control Module
- Go to next step: If the test lamp turns ON and OFF
Test or replace the component:
- A23LR Rear Side Door Latch-Left
- A23RR Rear Side Door Latch-Right