Pinpoint Test D: DTC B1A61:11 or B1A61:15
Climate Control System
Pinpoint Tests
Pinpoint Test D: DTC B1A61:11 or B1A61:15
Refer to Wiring Diagram Set 54, Manual Climate Control System for schematic and connector information. Diagrams By Number
Refer to Wiring Diagram Set 55, Automatic Climate Control System for schematic and connector information. Diagrams By Number
Normal Operation
The in-vehicle temperature and humidity sensor receives a ground from the HVAC module. The sensor varies its resistance with the temperature. As the temperature rises, the resistance falls. As the temperature falls the resistance rises. The HVAC module measures this resistance to determine the temperature at the sensor.
- DTC B1A61:11 (Cabin Temperature Sensor: Circuit Short to Ground) - the HVAC module senses lower than expected voltage on the sensor feedback circuit, indicating a short to ground.
- DTC B1A61:15 (Cabin Temperature Sensor: Circuit Short to Battery or Open) - the HVAC module senses greater than expected voltage on the sensor feedback circuit, indicating a short to voltage or an open circuit or sensor.
This pinpoint test is intended to diagnose the following:
- Wiring, terminals or connectors
- In-vehicle temperature and humidity sensor
- HVAC module
PINPOINT TEST D: DTC B1A61:11 OR B1A61:15
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D1 CHECK THE IN-VEHICLE TEMPERATURE SENSOR RESISTANCE
- Ignition OFF.
- Disconnect: In-Vehicle Temperature and Humidity Sensor C2247.
- Measure the resistance between the in-vehicle temperature and humidity sensor C2247-1, component side and C2247-3, component side and compare to the table below.
- Is the resistance within the specified values for the temperatures?
Yes
GO to D2.
No
INSTALL a new in-vehicle temperature and humidity sensor. CLEAR the DTCs. REPEAT the self-test. TEST the system for normal operation.
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D2 CHECK THE HVAC MODULE OUTPUT VOLTAGE
- Ignition ON.
- Measure the voltage between in-vehicle temperature and humidity sensor C2247-1, circuit VH414 (GN/BU), harness side and C2247-3, circuit RH111 (GY/BU), harness side.
- Is the voltage between 4.7 and 5.1 volts?
Yes
INSTALL a new in-vehicle temperature and humidity sensor. CLEAR the DTCs. REPEAT the self-test. If the DTC returns, GO to D8.
No
For DTC B1A61:15, GO to D3.
For DTC B1A61:11, GO to D6.
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D3 CHECK THE IN-VEHICLE TEMPERATURE SENSOR FEEDBACK CIRCUIT FOR A SHORT TO VOLTAGE
- Ignition OFF.
- Disconnect: HVAC Module - Electronic Manual Temperature Control (EMTC) C294A.
- Disconnect: HVAC Module - Dual Automatic Temperature Control (DATC) C228A/C2109A.
- Disconnect: HVAC Module - DATC C228B/C2109B.
- Ignition ON.
For EMTC vehicles
- For EMTC vehicles, measure the voltage between ground and HVAC module - EMTC C294A-4, circuit VH414 (GN/BU), harness side.
For DATC vehicles without navigation
- For DATC vehicles without navigation, measure the voltage between ground and HVAC module - DATC C2109B-8, circuit VH414 (GN/BU), harness side.
For DATC vehicles with navigation
- For DATC vehicles with navigation, measure the voltage between ground and HVAC module - DATC C228B-21, circuit VH414 (GN/BU), harness side.
- Is any voltage present?
Yes
REPAIR circuit VH414 (GN/BU) for a short to voltage. CLEAR the DTCs. REPEAT the self-test. TEST the system for normal operation.
No
GO to D4.
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D4 CHECK THE IN-VEHICLE TEMPERATURE SENSOR FEEDBACK CIRCUIT FOR AN OPEN
- Ignition OFF.
For EMTC vehicles
- For EMTC vehicles, measure the resistance between HVAC module - EMTC C294A-4, circuit VH414 (GN/BU), harness side and in-vehicle temperature and humidity sensor C2247-1, circuit VH414 (GN/BU), harness side.
For DATC vehicles without navigation
- For DATC vehicles without navigation, measure the resistance between HVAC module - DATC C2109B-8, circuit VH414 (GN/BU), harness side and in-vehicle temperature and humidity sensor C2247-1, circuit VH414 (GN/BU), harness side.
For DATC vehicles with navigation
- For DATC vehicles with navigation, measure the resistance between HVAC module - DATC C228B-21, circuit VH414 (GN/BU), harness side and in-vehicle temperature and humidity sensor C2247-1, circuit VH414 (GN/BU), harness side.
- Is the resistance less than 5 ohms?
Yes
GO to D5.
No
REPAIR circuit VH414 (GN/BU) for an open. CLEAR the DTCs. REPEAT the self-test. TEST the system for normal operation.
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D5 CHECK THE SIGNAL RETURN CIRCUIT FOR AN OPEN
For EMTC vehicles
- For EMTC vehicles, measure the resistance between HVAC module - DATC C294A-23, circuit RH111 (GY/BU), harness side and in-vehicle temperature and humidity sensor C2247-3, circuit RH111 (GY/BU), harness side.
For DATC vehicles without navigation
- For DATC vehicles without navigation, measure the resistance between HVAC module - DATC C2109A-23, circuit RH111 (GY/BU), harness side and in-vehicle temperature and humidity sensor C2247-3, circuit RH111 (GY/BU), harness side.
For DATC vehicles with navigation
- For DATC vehicles with navigation, measure the resistance between HVAC module - DATC C228A-10, circuit RH111 (GY/BU), harness side and in-vehicle temperature and humidity sensor C2247-3, circuit RH111 (GY/BU), harness side.
- Is the resistance less than 5 ohms?
Yes
GO to D8.
No
REPAIR circuit RH111 (GY/BU) for an open. CLEAR the DTCs. REPEAT the self-test. TEST the system for normal operation.
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D6 CHECK THE IN-VEHICLE TEMPERATURE SENSOR FEEDBACK CIRCUIT FOR A SHORT TO THE SIGNAL RETURN CIRCUIT
- Ignition OFF.
- Disconnect: HVAC Module - Electronic Manual Temperature Control (EMTC) C294A.
- Disconnect: HVAC Module - DATC C228B/C2109B.
- Measure the resistance between in-vehicle temperature and humidity sensor C2247-1, circuit VH414 (GN/BU), harness side and C2247-3, circuit RH111 (GY/BU), harness side.
- Is the resistance greater than 10,000 ohms?
Yes
GO to D7.
No
REPAIR circuit VH414 (GN/BU) for a short to circuit RH111 (GY/BU). CLEAR the DTCs. REPEAT the self-test. TEST the system for normal operation.
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D7 CHECK THE IN-VEHICLE TEMPERATURE SENSOR FEEDBACK CIRCUIT FOR A SHORT TO GROUND
For EMTC vehicles
- For EMTC vehicles, measure the resistance between HVAC module - EMTC C294A-4, circuit VH414 (GN/BU), harness side and ground.
For DATC vehicles without navigation
- For DATC vehicles without navigation, measure the resistance between HVAC module - DATC C2109B-8, circuit VH414 (GN/BU), harness side and ground.
For DATC vehicles with navigation
- For DATC vehicles with navigation, measure the resistance between HVAC module - DATC C228B-21, circuit VH414 (GN/BU), harness side and ground.
- Is the resistance greater than 10,000 ohms?
Yes
GO to D8.
No
REPAIR circuit VH414 (GN/BU) for a short to ground. CLEAR the DTCs. REPEAT the self-test. TEST the system for normal operation.
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D8 CHECK THE HVAC MODULE CONNECTION
- Inspect the HVAC module connectors for:
- corrosion
- pushed-out terminals
- damaged terminals
- Connect and correctly seat all the HVAC module connectors.
- Clear the DTCs.
- Enter the following diagnostic mode on the scan tool: Self-Test - HVAC Module.
- Operate the system and verify the concern is still present.
- Is the concern still present?
Yes
INSTALL a new HVAC module. REFER to Climate Control Service and Repair. TEST the system for normal operation.
No
The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector.
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