B0514
DTC B0158, B0163, B0173, B0178, B0509, or B0514
Diagnostic Instructions
* Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure. Initial Inspection and Diagnostic Overview
* Review Strategy Based Diagnosis for an overview of the diagnostic approach.
* Diagnostic Procedure Instructions provides an overview of each diagnostic category.
DTC Descriptors
DTC B0158 05
- Outside Air Temperature Sensor Circuit Short to Battery or Open
DTC B0158 02
- Outside Air Temperature Sensor Circuit Short to Ground
DTC B0163 05
- Passenger Compartment Temp Sensor 1 Circuit Short to Battery or Open
DTC B0163 02
- Passenger Compartment Temp Sensor 1 Circuit Short to Ground
DTC B0168 05
- Passenger Compartment Temp Sensor 2 Circuit Short to Battery or Open
DTC B0168 02
- Passenger Compartment Temp Sensor 2 Circuit Short to Ground
DTC B0173 05
- Output Air Temperature Sensor 1 Circuit Short to Battery or Open
DTC B0173 02
- Output Air Temperature Sensor 1 Circuit Short to Ground
DTC B0178 05
- Output Air Temperature Sensor 2 Circuit Short to Battery or Open
DTC B0178 02
- Output Air Temperature Sensor 2 Circuit Short to Ground
DTC B0509 05
- Output Air Temperature Sensor 3 Circuit Short to Battery or Open
DTC B0509 02
- Output Air Temperature Sensor 3 Circuit Short to Ground
DTC B0514 05
- Output Air Temperature Sensor 4 Circuit Short to Battery or Open
DTC B0514 02
- Output Air Temperature Sensor 4 Circuit Short to Ground
Diagnostic Fault Information
Circuit/System Description
Air temperature sensors allow the HVAC control module to monitor the temperature of the discharge air in the HVAC ducts. The module applies 5 volts to internal input resistors that are connected to the signal circuits of the air temperature sensors. The module provides ground to the air temperature sensors through the low reference circuit. The HVAC control module monitors the voltage drops across the air temperature sensors and uses the inputs for automatic control calculations. When the duct air temperatures are cold, the resistances of the sensors are high and the voltage signals are high. When the duct air temperatures are hot, the resistances of the sensors are low and the voltage signals are low. The HVAC control module converts the voltage values to count values where one volt is approximately equal to 51 counts.
DTC B0158
This DTC is for the Outside Air Temperature Sensor
DTC B0163
This DTC is for the Passenger Compartment Air Temperature Sensor
DTC B0173
This DTC is for the Left Upper Air Temperature Sensor
DTC B0178
This DTC is for the Left Lower Air Temperature Sensor
DTC B0509
This DTC is for the Right Upper Air Temperature Sensor
DTC B0514
This DTC is for the Right Lower Air Temperature Sensor
Conditions for Running the DTC
The ignition is turned On.
Conditions for Setting the DTC
The HVAC control module detects the signal circuit is less than 0.09 volts (5 counts) or more than 4.90 volts (250 counts).
Action Taken When the DTC Sets
The Auto feature of the HVAC control module will be inoperative.
Conditions for Clearing the DTC
* The DTC will become history if the HVAC control module no longer detects a failure.
* The history DTC will clear after 50 fault-free ignition cycles.
Circuit/System Testing
1. Ignition OFF, disconnect the harness connector at the appropriate temperature sensor.
2. Ignition OFF, test for less than 1.0 ohm of resistance between the appropriate ground circuit terminal and ground.
* Duct temperature sensor ground circuit terminal A
* Ambient temperature sensor ground circuit terminal B
* Inside air temperature sensor ground circuit terminal C
• If greater than the specified range, test the ground circuit for an open/high resistance.
3. Ignition ON, verify the appropriate scan tool temperature sensor parameter is greater than 250 counts.
• If less than the specified range, test the appropriate signal circuit terminal for a short to ground. If the circuit tests normal, replace the HVAC control module.
* Duct temperature sensor signal circuit terminal B
* Ambient temperature sensor signal circuit terminal A
* Inside air temperature sensor signal circuit terminal B
4. Install a 3A fused jumper wire between the appropriate signal circuit terminal and ground. Verify the appropriate scan tool temperature sensor parameter is less than 5 counts.
* Duct temperature sensor signal circuit terminal B
* Ambient temperature sensor signal circuit terminal A
* Inside air temperature sensor signal circuit terminal B
• If greater than the specified range, test the signal circuit for a short to voltage or an open/high resistance. If the circuit tests normal, replace the HVAC control module.
5. If all circuits test normal, test or replace the appropriate temperature sensor.
Repair Instructions
Perform the Diagnostic Repair Verification after completing the diagnostic procedure. Verification Tests
* Air Temperature Sensor Replacement - Lower Left Side
* Air Temperature Sensor Replacement - Lower Right Side
* Ambient Air Temperature Sensor Replacement
* Inside Air Temperature Sensor Replacement
* Programming and Relearning for HVAC control module setup, and programming. Programming and Relearning