B2795

Climate Control System

Pinpoint Test E: DTC B2426, B2427, B2795 or B2796

Refer to Wiring Diagram Set 55, Automatic Climate Control System for schematic and connector information Electrical Diagrams.

Normal Operation

Under normal operation, the sunload sensor receives a ground from the HVAC module. As the light applied to the sensor changes, the PCM detects the change through the RH and LH feedback circuits.





This pinpoint test is intended to diagnose the following:

- Wiring, terminals or connectors

- Solar radiation sensor

- HVAC module

PINPOINT TEST E : DTC B2426, B2427, B2795 OR B2796

E1 CHECK THE SOLAR RADIATION SENSOR REFERENCE VOLTAGE

- Ignition OFF.

- Disconnect: Solar Radiation Sensor C286.

- Ignition ON.

- Press the AUTO button on the HVAC module.

- Measure the voltage between solar radiation sensor C286-4, circuit RH111 (GY/BU), harness side and solar radiation sensor:
- C286-3, circuit VH417 (YE/OG), harness side.

- C286-1, circuit VH416 (VT/GY), harness side.






Is the voltage between 4.7 and 5.1 volts?

Yes
INSTALL a new solar radiation sensor. CLEAR the DTCs. REPEAT the self-test. If the code returns, GO to E6.

No

For DTC B2796 or B2426, GO to E2.

For DTC B2795 or B2427, GO to E4.

E2 CHECK CIRCUIT RH111 (GY/BU) FOR AN OPEN

- Ignition OFF.

- Measure the resistance between solar radiation sensor C286-4, circuit RH111 (GY/BU), harness side and HVAC module- Dual Automatic Temperature Control (DATC) C228A-10, circuit RH111 (GY/BU), harness side.





Is the resistance less than 5 ohms?

Yes
GO to E3.

No
REPAIR circuit RH111 (GY/BU) for an open. CLEAR the DTCs. REPEAT the self-test. TEST the system for normal operation.

E3 CHECK CIRCUIT VH417 (YE/OG) OR VH416 (VT/GY) FOR AN OPEN

- Disconnect: HVAC Module- DATC (Dual Automatic Temperature Control) C228A.

- For DTC B2796





For DTC B2796, measure the resistance between HVAC module- DATC (Dual Automatic Temperature Control) C228A-5, circuit VH417 (YE/OG), harness side and solar radiation sensor C286-3, circuit VH417 (YE/OG), harness side.

- For DTC B2426





For DTC B2426, measure the resistance between HVAC module- DATC (Dual Automatic Temperature Control) C228A-4, circuit VH416 (VT/GY), harness side and solar radiation sensor C286-1, circuit VH416 (VT/GY), harness side.

Is the resistance less than 5 ohms?

Yes
GO to E6.

No
REPAIR circuit VH416 (VT/GY) or VH417 (YE/OG) for an open. CLEAR the DTCs. REPEAT the self-test. TEST the system for normal operation.

E4 CHECK CIRCUIT VH417 (YE/OG) OR VH416 (VT/GY) FOR A SHORT TO CIRCUIT RH111 (GY/BU)

- Ignition OFF.

- Disconnect: HVAC Module- DATC (Dual Automatic Temperature Control) C228A.

- Measure the resistance between solar radiation sensor C286-4, circuit RH111 (GY/BU), harness side and solar radiation sensor:
- For DTC B2795, C286-3, circuit VH417 (YE/OG), harness side.

- For DTC B2427, C286-1, circuit VH416 (VT/GY), harness side.






Is the resistance greater than 10,000 ohms?

Yes
GO to E5.

No
REPAIR circuit VH417 (YE/OG) or VH416 (VT/GY) for a short to circuit RH111 (GY/BU). CLEAR the DTCs. REPEAT the self-test. TEST the system for normal operation.

E5 CHECK CIRCUITS VH416 (VT/GY) AND VH417 (YE/OG) FOR A SHORT TO GROUND

- Measure the resistance between ground and solar radiation sensor:
- For DTC B2795, C286-3, circuit VH417 (YE/OG), harness side.

- For DTC B2427, C286-1, circuit VH416 (VT/GY), harness side.






Is the resistance greater than 10,000 ohms?

Yes
GO to E6.

No
REPAIR circuit VH416 (VT/GY) or VH417 (YE/OG) for a short to ground. CLEAR the DTCs. REPEAT the self-test. TEST the system for normal operation.

E6 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.

- 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. CLEAR the DTCs. REPEAT the self-test. TEST the system for normal operation.