Circuit/System Testing

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.