DTC B0163 or B0183
DTC B0163 or 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 B0163 02
- Passenger Compartment Temperature Sensor Circuit Short to Ground
DTC B0163 05
- Passenger Compartment Temperature Sensor Circuit High Voltage/Open
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
Connector End View Reference
Component Connector End Views Hybrid/EV Battery Pack X1 A4
Description and Operation
Automatic HVAC Description and Operation
Electrical Information Reference
* 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 Control Module Referencesfor scan tool information
Circuit/System Testing
1. Vehicle OFF, disconnect the harness connector at the B10B ambient light / sunload sensor.
2. Vehicle OFF, test for less than 10 ohm between the low reference circuit terminal 6 and ground.
• If greater than the specified range, test the low reference circuit for an open/high resistance. If the circuit tests normal, replace the K33 HVAC control module.
3. Vehicle in Service Mode.
* Verify the scan tool Passenger Compartment Air Temp Sensor (Unfiltered) parameter is less than -35°C (-39°F).
* Verify the scan tool Sunload parameter is less than 1 W/m(2).
• If greater than the specified range, test the following signal circuit terminals for a short to ground. If the circuit tests normal, replace the K33 HVAC control module.
* Signal circuit terminal 3.
* Signal circuit terminal 4.
4. Install a 3 A fused jumper wire between the following signal circuit terminals and the low reference circuit terminal.
* Signal circuit terminal 3 and 6.
* Signal circuit terminal 4 and 6.
* Verify the scan tool Passenger Compartment Air Temp Sensor (Unfiltered) parameter is greater than 85°C (185°F).
* Verify the scan tool Sunload parameter is greater than 10 W/m(2).
• If less than the specified range, test the signal circuits for a short to voltage or an open/high resistance. If the circuit tests normal, replace the K33 HVAC control module.
* Signal circuit terminal 3.
* Signal circuit terminal 4.
5. If all circuits test normal, test or replace the B10B ambient light / sunload sensor.
Repair Instructions
Perform the Diagnostic Repair Verification Verification Tests after completing the diagnostic procedure.
* HVAC Component Replacement Reference
* Control Module References Control Module Referencesfor HVAC control module replacement, programming and setup