B0183

DTC B0183

Diagnostic Instructions

* Perform the Diagnostic System Check - Vehicle Diagnostic System Check - Vehicle prior to using this diagnostic procedure.
* Review Strategy Based Diagnosis Strategy Based Diagnosis for an overview of the diagnostic approach.
* Diagnostic Procedure Instructions Diagnostic Procedure Instructionsprovides an overview of each diagnostic category.

DTC Descriptors
DTC B0183 02
- Solar Load Sensor Circuit Short to Ground

DTC B0183 05
- Solar Load Sensor Circuit High Voltage/Open

Diagnostic Fault Information






Circuit/System Description

The ambient light/sunload sensor includes the sunload sensor and passenger compartment temperature sensor.

This sensor assembly provides information about:

* Sun heat intensity
* Passenger compartment temperature

The vehicle uses a sunload sensor that is integrated into one sensor assembly along with the passenger compartment temperature sensor. Low reference and signal circuits enable the sensor to operate. The sensor signal varies between 0-5 V.

The passenger compartment temperature sensor is a negative temperature co-efficient thermistor. A signal and low reference circuit enables the sensor to operate. As the air temperature increases, the sensor resistance decreases. The sensor signal varies between 0-5 V.

Bright or high intensity light causes the vehicles interior temperature to increase. The HVAC system compensates for the increased temperature by diverting additional cool air into the vehicle.

Conditions for Running the DTC

* Vehicle in Service Mode.
* The HVAC control module is ON.

Conditions for Setting the DTC

B0163 02 or B0163 05

The HVAC control module detects the sensor signal out of range. The signal voltage is less than 0.1 V or greater than 4.9 V for more than 50 ms.

B0183 02

The 5 V identification pulse is not received.

B0183 05

The input signal is static and greater than 4.8 V.

Action Taken When the DTC Sets

* The system will use the last valid values as default.
* If no value is read at the time of fault, the HVAC control module uses 0 W/m(2).

Conditions for Clearing the DTC

B0163 02 or B0163 05

The sensor signal is within specified range between 0.1-4.9 V.

B0183 02 or B0183 05

The sensor signal is within specified range between 0.1-4.9 V.

Reference Information
Schematic Reference

HVAC Schematics Electrical Diagrams
Connector End View Reference

Component Connector End Views Hybrid/EV Battery Pack X1
Description and Operation

Automatic HVAC Description and Operation HVAC - Automatic
Electrical Information Reference

* Circuit Testing Circuit Testing
* Connector Repairs Connector Repairs
* Testing for Intermittent Conditions and Poor Connections Testing for Intermittent Conditions and Poor Connections
* Wiring Repairs Wiring Repairs

Scan Tool Reference

Control Module References Programming and Relearningfor scan tool information

Circuit/System Testing

1. Vehicle OFF and all vehicle systems OFF, disconnect the harness connector at the B10B ambient light/ sunload sensor. It may take up to 2 minutes for all vehicle systems to power down.
2. Test for less than 10 ohm between the low reference circuit terminal 6 and ground.

• If 10 ohm or greater

1. Vehicle OFF, disconnect the harness connector at the K33 HVAC control module.
2. Test for less than 2 ohm in the low reference circuit end to end.

• If 2 ohm or greater, repair the open/high resistance in the circuit.
• If less than 2 ohm, replace the K33 HVAC control module.

• If less than 10 ohm

3. Vehicle in Service Mode.
4. Verify the Sunload scan tool parameter is less than 2 W/m2.

• If 2 W/m2 or greater

1. Vehicle OFF, disconnect the harness connector at the K33 HVAC control module.
2. Test for infinite resistance between the signal circuit terminal 4 and ground.

• If less than infinite resistance, repair the short to ground on the circuit.
• If infinite resistance, replace the K33 HVAC control module.

• If less than 2 W/m2

5. Install a 3 A fused jumper wire between the signal circuit terminal 4 and the low reference circuit terminal 6.
6. Verify the scan tool parameter is greater than 20 W/m2.

• If 20 W/m2 or less

1. Vehicle OFF, disconnect the harness connector at the K33 HVAC control module, vehicle in Service Mode.
2. Test for less than 1 V between the signal circuit terminal 4 and ground.

• If 1 V or greater, repair the short to voltage on the circuit.

• If less than 1 V

3. Vehicle OFF
4. Test for less than 2 ohm in the signal circuit end to end.

• If 2 ohm or greater, repair the open/high resistance in the circuit.
• If less than 2 ohm, replace the K33 HVAC control module.

• If greater than 20 W/m2

7. Test or replace the B10B ambient light sensor.

Repair Instructions

Perform the Diagnostic Repair Verification Verification Tests after completing the diagnostic procedure.

* HVAC Component Replacement Reference HVAC Component Replacement Reference
* Control Module References Programming and Relearningfor HVAC control module replacement, programming and setup