B0163
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 Instructions) provides 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 Short to Battery or Open
DTC B0183 02
- Solar Load Sensor Circuit Short to Ground
DTC B0183 05
- Solar Load Sensor Circuit Short to Battery or Open
Diagnostic Fault Information
Circuit/System Description
The ambient light/sunload sensor integrates the sunload sensor and passenger compartment temperature sensor.
This sensor assembly provides information about:
* Sun heat intensity
* Passenger Compartment Temperature
The solar sensor is connected to ground and to the 5 V stabilized voltage supply through the HVAC control module. As the sunload increases, the sensor signal voltage also increases and vice versa. The signal varies between 1.4-4.5 V and is provided to the HVAC control module.
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
* Ignition ON.
* 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 input signal is out of range. The voltage is less than 0.1 V.
B0183 05
The input signal is out of range. The voltage is greater than 4.9 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) as intensity.
Conditions for Clearing the DTC
The condition for setting the DTC is no longer present.
Reference Information
Schematic Reference
HVAC Schematics (HVAC - Automatic)
Connector End View Reference
Component Connector End Views (Connector End Views By Name)
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 Relearning) for scan tool information
Circuit/System Verification
1. Verify that DTC B0163 02 or B0163 05 is not set.
• If DTC is present, refer to Passenger Compartment Temperature Sensor Circuit Malfunction.
2. Verify that DTC B0183 02 or B0183 05 is not set.
• If DTC is present, refer to Sunload Sensor Circuit Malfunction.
3. Measure actual inside air temperature using a thermometer. Compare this value to the scan tool Passenger Compartment Air Temperature parameter. The measured temperature should be within 5°C (9°F) difference of parameter value.
• If not within the specified range, replace the B10B Ambient Light/Sunload Sensor.
Circuit/System Testing
Passenger Compartment Temperature Sensor Circuit Malfunction
1. Ignition OFF, disconnect the harness connector at the B10B Ambient Light/Sunload Sensor.
2. Test for less than 5 ohm between the ground circuit terminal 6 and ground.
• If greater than the specified range, test the ground circuit for an open/high resistance.
3. Ignition ON, test for 4.8-5.2 V between the ground circuit terminal 6 and the signal circuit terminal 3.
• If less than the specified range, test the signal circuit for a short to ground or open/high resistance. If the circuit tests normal, replace the K33 HVAC Control Module.
• If greater than the specified range, test the signal circuit for a short to voltage. If the circuit tests normal, replace the K33 HVAC Control Module.
4. If all circuits test normal, replace the B10B Ambient Light/Sunload Sensor.
Sunload Sensor Circuit Malfunction
1. Ignition OFF, disconnect the harness connector at the B10B Ambient Light/Sunload Sensor.
2. Ignition ON, test for 4.8-5.2 V between the ground circuit terminal 6 and the signal circuit terminal 4.
• If less than the specified range, test the signal circuit for a short to ground or open/high resistance. If the circuit tests normal, replace the K33 HVAC Control Module.
• If greater than the specified range, test the signal circuit for a short to voltage. If the circuit tests normal, replace the K33 HVAC Control Module.
3. If all circuits test normal, replace the B10B Ambient Light/Sunload Sensor.
Repair Instructions
Perform the Diagnostic Repair Verification (Verification Tests) after completing the diagnostic procedure.
* Sun Load Temperature and Headlamp Automatic Control Ambient Light Sensor Replacement (Service and Repair)
* Control Module References (Programming and Relearning) for HVAC control module replacement, setup, and programming