DTC B0163, B0183, or B1405
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DTC B0163, B0183, or B1405
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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
DTC B1405 02
Control Module Voltage Reference Output 2 Circuit Short to Ground
DTC B1405 05
Control Module Voltage Reference Output 2 Circuit High Voltage/Open
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Circuit/System Description
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The ambient light/sunload sensor includes the sunload sensor and passenger compartment temperature sensor.
This sensor assembly provides information about:
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Passenger compartment temperature
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The sunload sensor is connected to ground and to a 12 V clocked power supply through the HVAC control module. This clocked power supply is to power the sensor electronics and to work as a clock generator to the sunload sensor micro controller. The sensor uses a pulse signal for data identification and transferring the sun intensity measurement. At each positive transition from the clocked supply input, the sunload sensor micro controller will shift channels enabling new intensity measurement on the signal output to the HVAC control module. The signal voltage varies between 0-4 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.
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Conditions for Running the DTC
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The HVAC control module is ON.
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Conditions for Setting the DTC
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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.
B1405 02
Clocked supply for multi zone sensor is shorted to ground.
B1405 05
Clocked supply for multi zone sensor is shorted to voltage or open.
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Action Taken When the DTC Sets
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The system will use the last valid values as default.
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If no value is read at the time of fault, the HVAC Control Module uses 0 W/m
2
as intensity, 45° for elevation and -75° for azimuth.
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Conditions for Clearing the DTC
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B0163 02 or B0163 05
The sensor signal is within specified range between 0.1-4.9 V.
B0183 02
The 5 V identification pulse will be received.
B0183 05
The correct pulse signal succession will be received.
B1405 02 or B1405 05
The condition for setting the DTC is no longer present.
Schematic Reference
HVAC Schematics
Connector End View Reference
Component Connector End Views
Description and Operation
Automatic HVAC Description and Operation
Electrical Information Reference
Scan Tool Reference
Control Module References
for scan tool information
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Circuit/System Verification
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1.
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Verify that DTC B1405 02 or B1405 05 is not set.
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2.
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If DTC is present, refer to Ambient Light/Sunload Sensor Power Supply Malfunction.
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3.
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Verify that DTC B0163 02 or B0163 05 is not set.
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4.
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If DTC is present, refer to Passenger Compartment Temperature Sensor Circuit Malfunction.
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5.
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Verify that DTC B0183 02 or B0183 05 is not set.
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6.
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If DTC is present, refer to Sunload Sensor Circuit Malfunction.
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7.
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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.
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8.
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If not within the specified range, replace the B10B Ambient Light/Sunload Sensor.
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Ambient Light/Sunload Sensor Power Supply Malfunction
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1.
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Ignition OFF, disconnect the harness connector at the B10B Ambient Light/Sunload Sensor.
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2.
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Test for less than 10 Ω between the B10B Ambient Light/Sunload Sensor ground circuit terminal 6 and ground.
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3.
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If greater than the specified range, test the ground circuit for an open/high resistance. If the circuit tests normal, replace the K33 HVAC Control Module.
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4.
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Ignition ON, test for battery voltage between the reference voltage circuit terminal 2 and ground.
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5.
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If greater than the specified range, test the reference voltage circuit for an open or short to ground. If the circuit tests normal, replace the K33 HVAC Control Module.
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6.
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If all circuits test normal, replace the B10B Ambient Light/Sunload Sensor.
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Passenger Compartment Temperature Sensor Circuit Malfunction
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1.
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Ignition OFF, disconnect the harness connector at the B10B Ambient Light/Sunload Sensor.
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2.
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Ignition ON, test for 4.8-5.2 V between the signal circuit terminal 3 and ground.
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3.
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If less than the specified range, test the signal circuit terminal for a short to ground or open/high resistance . If the circuit tests normal, replace the K33 HVAC Control Module.
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4.
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If greater than the specified range, test the signal circuit terminal for a short to battery. If the circuit tests normal, replace the K33 HVAC Control Module.
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5.
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If all circuits test normal, replace the B10B Ambient Light/Sunload Sensor.
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Sunload Sensor Circuit Malfunction
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1.
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Ignition OFF, disconnect the harness connector at the B10B Ambient Light/Sunload Sensor.
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2.
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Ignition ON, test for 4.8-5.2 V between the signal circuit terminal 4 and ground.
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3.
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If less than the specified range, test the signal circuit terminal for a short to ground or open/high resistance . If the circuit tests normal, replace the K33 HVAC Control Module.
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4.
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If greater than the specified range, test the signal circuit terminal for a short to battery. If the circuit tests normal, replace the K33 HVAC Control Module.
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5.
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If all circuits test normal, replace the B10B Ambient Light/Sunload Sensor.
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Perform the
Diagnostic Repair Verification
after completing the diagnostic procedure.
