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 Instructions provides 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 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
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/m2 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 Description and Operation
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 Testing
1. Ignition 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 ohms between the low reference circuit terminal 6 and ground.
• If 10 ohms or greater
1. Ignition OFF, disconnect the harness connector at the K33 HVAC control module.
2. Test for less than 2 ohms in the low reference circuit end to end.
• If 2 ohms or greater, repair the open/high resistance in the circuit.
• If less than 2 ohms, replace the K33 HVAC control module.
• If less than 10 ohms
3. Ignition ON.
4. Verify the scan tool Sunload parameter is less than 2 W/m2.
• If 2 W/m2 or greater
1. Ignition 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 Sunload parameter is greater than 20 W/m2.
• If 20 W/m2 or less
1. Ignition OFF, disconnect the harness connector at the K33 HVAC control module, ignition ON.
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. Ignition OFF
4. Test for less than 2 ohms in the signal circuit end to end.
• If 2 ohms or greater, repair the open/high resistance in the circuit.
• If less than 2 ohms, replace the K33 HVAC control module.
• If greater than 20 W/m2
7. Test or replace the B10B ambient light/ sunload sensor.
Repair Instructions
Perform the Diagnostic Repair Verification Verification Tests after completing the repair.
* HVAC Component Replacement Reference HVAC Component Replacement Reference
* Control Module References Programming and Relearning for HVAC control module programming and setup