Circuit/System Testing

WARNING: This page is about a different car, the 2015 Cadillac SRX. However, it is still accessible from the selected car via links, so may be relevant.

Ignition OFF and all vehicle systems OFF, disconnect the harness connector at the B10B Ambient Light/Sunload Sensor. It may take up to 2 min for all vehicle systems to power down.
Test for less than 30 Ω between the low reference circuit terminal 6 and ground.
- If 30 Ω or greater
1. Ignition OFF, disconnect the harness connector at the K33 HVAC Control Module.
2. Test for less than 2 Ω in the low reference circuit end to end.
  - If 2 Ω or greater, repair the open/high resistance in the circuit.
  - If less than 2 Ω, replace the K33 HVAC Control Module.
- If less than 10 Ω
Ignition ON.
Test for greater than 8.5 V between the control circuit terminal 1 and ground.
- If 8.5 V or less
1. Ignition OFF, disconnect the harness connector at the K9 Body Control Module.
2. Test for infinite resistance between the control circuit and ground.
  - If less than infinite resistance, repair the short to ground on the circuit.
  - If infinite resistance
3. Test for less than 2 Ω in the control circuit 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 greater than 8.5 V
Ignition OFF, connect the harness connector at the B10B Ambient Light/Sunload Sensor, ignition ON.
Verify the security LED is not illuminated.
- If the security LED is illuminated
1. Ignition OFF, disconnect the X1 harness connector at the K9 Body Control Module, ignition ON.
2. Test for less than 1 V between the control circuit terminal 21 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.
- If the security LED is not illuminated
Test or replace the B10B Ambient Light/Sunload Sensor.