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 10 min for all vehicle systems to power down.

NOTE:

The scan tool must be disconnected from the vehicle before performing the next test.

Test for less than 10Ω between the low reference circuit terminal 6 and ground.
- If 10Ω or greater
1. Ignition OFF, disconnect the harness connectors at the K33 HVAC Control Module.
2. Test for less than 2Ω in the low reference circuit end to end.
  - If 2Ω or greater, repair the open/high resistance in the circuit.
  - If less than 2Ω, replace the K33 HVAC Control Module.
- If less than 10Ω
Ignition ON.
Test for 4.8-5.2V between the signal circuit terminal 4 and ground.
- If less than 4.8V
1. Ignition OFF, disconnect the harness connectors at the K33 HVAC Control Module.
2. Test for infinite resistance between the signal circuit and ground.
  - If less than infinite resistance, repair the short to ground on the circuit.
  - If infinite resistance
3. Test for less than 2Ω in the signal circuit end to end.
  - If 2Ω or greater, repair the open/high resistance in the circuit.
  - If less than 2Ω, replace the K33 HVAC Control Module.
- If greater than 5.2V
1. Ignition OFF, disconnect the harness connectors at the K33 HVAC Control Module, ignition ON.
2. Test for less than 1V between the signal circuit and ground.
  - If 1V or greater, repair the short to voltage on the circuit.
  - If less than 1V, replace the K33 HVAC Control Module.
- If between 4.8-5.2V
Test or replace the B10B Ambient Light/Sunload Sensor.
Verify DTC B0183 does not set or the symptom does not occur while operating the vehicle within the Conditions for Running the DTC.
- If the DTC or symptom is not corrected.
  Replace the K33 HVAC Control Module.
- If the DTC or symptom is corrected.
All OK.