B1A69:15

Climate Control System

Pinpoint Test E: DTC B1A69:11 or B1A69:15

Normal Operation

The in-vehicle temperature and humidity sensor receives a ground from the HVAC module. The sensor varies its resistance with the humidity inside the vehicle. As the humidity rises, the resistance falls. As the humidity falls the resistance rises. The HVAC module measures this resistance to determine the humidity at the sensor.

- DTC B1A69:11 (Humidity Sensor: Circuit Short to Ground)- the HVAC module senses lower than expected voltage on the sensor feedback circuit, indicating a short to ground.

- DTC B1A69:15 (Humidity 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 E : DTC B1A69:11 OR B1A69:15

E1 CHECK THE HVAC MODULE OUTPUT VOLTAGE

- Ignition OFF.

- Disconnect: In-Vehicle Temperature and Humidity Sensor C2247.

- Ignition ON.

- Measure the voltage between in-vehicle temperature and humidity sensor C2247-4, circuit VH413 (WH/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 E7.
No
For DTC B1A69:15, GO to E2.

For DTC B1A69:11, GO to E5.

E2 CHECK THE HUMIDITY 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 (Dual Automatic Temperature Control) C228B/C2109B.

- Ignition ON.

- For EMTC (Electronic Manual Temperature Control) vehicles





For EMTC (Electronic Manual Temperature Control) vehicles, measure the voltage between ground and HVAC module- EMTC (Electronic Manual Temperature Control) C294A-5, circuit VH413 (WH/BU), harness side.

- For DATC (Dual Automatic Temperature Control) vehicles without navigation





For DATC (Dual Automatic Temperature Control) vehicles without navigation, measure the voltage between ground and HVAC module- DATC (Dual Automatic Temperature Control) C2109B-7, circuit VH413 (WH/BU), harness side.

- For DATC (Dual Automatic Temperature Control) vehicles with navigation





For DATC (Dual Automatic Temperature Control) vehicles with navigation, measure the voltage between ground and HVAC module- DATC (Dual Automatic Temperature Control) C228B-20, circuit VH413 (WH/BU), harness side.

Is any voltage present?

Yes
REPAIR circuit VH413 (WH/BU) for a short to voltage. CLEAR the DTCs. REPEAT the self-test. TEST the system for normal operation.
No
GO to E3.

E3 CHECK THE HUMIDITY SENSOR FEEDBACK CIRCUIT FOR AN OPEN

- Ignition OFF.

- For EMTC (Electronic Manual Temperature Control) vehicles





For EMTC (Electronic Manual Temperature Control) vehicles, measure the resistance between HVAC module- EMTC (Electronic Manual Temperature Control) C294A-5, circuit VH413 (WH/BU), harness side and in-vehicle temperature and humidity sensor C2247-4, circuit VH413 (WH/BU), harness side.

- For DATC (Dual Automatic Temperature Control) vehicles without navigation





For DATC (Dual Automatic Temperature Control) vehicles without navigation, measure the resistance between HVAC module- DATC (Dual Automatic Temperature Control) C2109B-7, circuit VH413 (WH/BU), harness side and in-vehicle temperature and humidity sensor C2247-4, circuit VH413 (WH/BU), harness side.

- For DATC (Dual Automatic Temperature Control) vehicles with navigation





For DATC (Dual Automatic Temperature Control) vehicles with navigation, measure the resistance between HVAC module- DATC (Dual Automatic Temperature Control) C228B-20, circuit VH413 (WH/BU), harness side and in-vehicle temperature and humidity sensor C2247-4, circuit VH413 (WH/BU), harness side.

Is the resistance less than 5 ohms?

Yes
GO to E4.
No
REPAIR circuit VH413 (WH/BU) for an open. CLEAR the DTCs. REPEAT the self-test. TEST the system for normal operation.

E4 CHECK THE SIGNAL RETURN CIRCUIT FOR AN OPEN

- For EMTC (Electronic Manual Temperature Control) vehicles





For EMTC (Electronic Manual Temperature Control) vehicles, measure the resistance between HVAC module- DATC (Dual Automatic Temperature Control) 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 (Dual Automatic Temperature Control) vehicles without navigation





For DATC (Dual Automatic Temperature Control) vehicles without navigation, measure the resistance between HVAC module- DATC (Dual Automatic Temperature Control) 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 (Dual Automatic Temperature Control) vehicles with navigation





For DATC (Dual Automatic Temperature Control) vehicles with navigation, measure the resistance between HVAC module- DATC (Dual Automatic Temperature Control) 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 E7.
No
REPAIR circuit RH111 (GY/BU) for an open. CLEAR the DTCs. REPEAT the self-test. TEST the system for normal operation.

E5 CHECK THE HUMIDITY SENSOR FEEDBACK CIRCUIT FOR A SHORT TO THE SIGNAL RETURN CIRCUIT

- Ignition OFF.

- Disconnect: HVAC Module- EMTC (Electronic Manual Temperature Control) C294A.

- Disconnect: HVAC Module- DATC (Dual Automatic Temperature Control) C228B/C2109B.

- Measure the resistance between in-vehicle temperature and humidity sensor C2247-4, circuit VH413 (WH/BU), harness side and C2247-3, circuit RH111 (GY/BU), harness side.






Is the resistance greater than 10,000 ohms?

Yes
GO to E6.
No
REPAIR circuit VH413 (WH/BU) for a short to circuit RH111 (GY/BU). CLEAR the DTCs. REPEAT the self-test. TEST the system for normal operation.

E6 CHECK THE HUMIDITY SENSOR FEEDBACK CIRCUIT FOR A SHORT TO GROUND

- For EMTC (Electronic Manual Temperature Control) vehicles





For EMTC (Electronic Manual Temperature Control) vehicles, measure the resistance between HVAC module- EMTC (Electronic Manual Temperature Control) C294A-5, circuit VH413 (WH/BU), harness side and ground.

- For DATC (Dual Automatic Temperature Control) vehicles without navigation





For DATC (Dual Automatic Temperature Control) vehicles without navigation, measure the resistance between HVAC module- DATC (Dual Automatic Temperature Control) C2109B-7, circuit VH413 (WH/BU), harness side and ground.

- For DATC (Dual Automatic Temperature Control) vehicles with navigation





For DATC (Dual Automatic Temperature Control) vehicles with navigation, measure the resistance between HVAC module- DATC (Dual Automatic Temperature Control) C228B-20, circuit VH413 (WH/BU), harness side and ground.

Is the resistance greater than 10,000 ohms?

Yes
GO to E7.
No
REPAIR circuit VH413 (WH/BU) for a short to ground. CLEAR the DTCs. REPEAT the self-test. TEST the system for normal operation.

E7 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. 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.