Pinpoint Test E: DTC B2426, B2427, B2795 Or B2796
Climate Control System
Pinpoint Tests
Pinpoint Test E: DTC B2426, B2427, B2795 or B2796
Refer to Wiring Diagram Set 55, Automatic Climate Control System for schematic and connector information. Diagrams By Number
Normal Operation
Under normal operation, the solar radiation sensor receives a ground from the HVAC module - Dual Automatic Temperature Control (DATC) through circuit RH111 (GY/BU). A 5-volt reference voltage is supplied to the solar radiation sensor from the HVAC module - DATC through circuit VH417 (YE/OG) (RH) and circuit VH416 (VT/GY) (LH).
B2426-B2796:
This pinpoint test is intended to diagnose the following:
- Wiring, terminals or connectors
- A/C solar radiation sensor
- HVAC module - DATC
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.
- Measure the voltage between solar radiation sensor C286-4, circuit RH111 (GY/BU), harness side and solar radiation sensor:
- For DTC B2426 or B2427, C286-1, circuit VH417 (YE/OG), harness side.
- For DTC B2795 or B2796, C286-3, 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
If diagnosing DTC B2796 or DTC B2426, GO to E2.
If diagnosing DTC B2795 or DTC B2427, GO to E4.
-------------------------------------------------
E2 CHECK CIRCUIT RH111 (GY/BU) FOR AN OPEN
- Ignition OFF.
- Disconnect: HVAC Module - DATC C228a.
- Measure the resistance between solar radiation sensor C286-4, circuit RH111 (GY/BU), harness side and HVAC module - 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 CIRCUIT VH416 (VT/GY) FOR AN OPEN
DTC B2796
- NOTE: For DTC B2796.
- Measure the resistance between HVAC module - DATC C228a-5, circuit VH416 (VT/GY), harness side and solar radiation sensor C286-3, circuit VH416 (VT/GY), harness side.
DTC B2426
- NOTE: For DTC B2426.
- Measure the resistance between HVAC module - DATC C228a-4, circuit VH417 (YE/OG), harness side and solar radiation sensor C286-1, circuit VH417 (YE/OG), harness side.
- Is the resistance less than 5 ohms?
Yes
GO to E6.
No
REPAIR circuit VH416 (VT/GY) or circuit 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 CIRCUIT VH416 (VT/GY) FOR A SHORT TO CIRCUIT RH111 (GY/BU)
- Ignition OFF.
- Disconnect: HVAC Module - DATC 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 VH416 (VT/GY), harness side.
- For DTC B2427, C286-1, circuit VH417 (YE/OG), harness side.
- Is the resistance greater than 10,000 ohms?
Yes
GO to E5.
No
REPAIR circuits VH417 (YE/OG) and 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 CIRCUIT 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 VH416 (VT/GY), harness side.
- For DTC B2427, C286-1, circuit VH417 (YE/OG), 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 MODULE CONNECTION
- Carry out the HVAC Module Cold Boot Process. HVAC Module Cold Boot Process
- Carry out the HVAC Module - Dual Automatic Temperature Control (DATC) On-Demand Self Test. Alternate Diagnostic Methods - HVAC Module - Dual Automatic Temperature Control (DATC) Only
- Operate the system.
- Does the concern return?
Yes
INSTALL a new HVAC module - DATC. 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.
-------------------------------------------------