Pinpoint Test F: DTC B1A63:11, B1A63:15, B1A64:11 Or DTC B1A64:15
Climate Control System
Pinpoint Test F: DTC B1A63:11, B1A63:15, B1A64:11 or DTC B1A64:15
Normal Operation
The autolamp/autolamp/sunload sensor is grounded. As the light applied to the sensor changes, the HVAC module detects the change through the RH and LH feedback circuits.
This pinpoint test is intended to diagnose the following:
- Wiring, terminals or connectors
- Autolamp/autolamp/sunload sensor
- HVAC module
PINPOINT TEST F : DTC B1A63:11, B1A63:15, B1A64:11 OR DTC B1A64:15
F1 CHECK THE AUTOLAMP/SUNLOAD SENSOR REFERENCE VOLTAGE
- Ignition OFF.
- Disconnect: Autolamp/Sunload Sensor C286.
- Ignition ON.
- Press the AUTO button.
- Measure the voltage between autolamp/sunload sensor C286-4, circuit RH111 (GY/BU), harness side and autolamp/sunload sensor:
- For DTC B1A63:11 or B1A63:15, C286-1, circuit VH417 (YE/OG), harness side.
- For DTC B1A64:11 or B1A64:15, C286-3, circuit VH416 (VT/GY), harness side.
Is the voltage between 4.7 and 5.1 volts?
Yes
INSTALL a new autolamp/sunload sensor. CLEAR the DTCs. REPEAT the self-test. If the code returns, GO to F7.
No
If diagnosing DTC B1A63:15 or DTC B1A64:15, GO to F2.
If diagnosing DTC B1A63:11 or DTC B1A64:11, GO to F5.
F2 CHECK THE AUTOLAMP/SUNLOAD SENSOR FEEDBACK CIRCUITS FOR A SHORT TO VOLTAGE
- Ignition OFF.
- Disconnect: HVAC Module- Dual Automatic Temperature Control (DATC) C228A/C2109A.
- Disconnect: HVAC Module- DATC (Dual Automatic Temperature Control) C228B/C2109B.
- Ignition ON.
- Measure the voltage between ground and autolamp/sunload sensor:
- For DTC B1A64:15, C286-3, circuit VH416 (VT/GY), harness side.
- For DTC B1A63:15, C286-1, circuit VH417 (YE/OG), harness side.
Is any voltage present?
Yes
REPAIR circuit VH416 (VT/GY) or VH417 (YE/OG) for a short to voltage. CLEAR the DTCs. REPEAT the self-test. TEST the system for normal operation.
No
GO to F3.
F3 CHECK THE AUTOLAMP/SUNLOAD SENSOR GROUND CIRCUIT FOR AN OPEN
- Ignition OFF.
- For vehicles without navigation
For vehicles without navigation, measure the resistance between autolamp/sunload sensor C286-4, circuit RH111 (GY/BU), harness side and HVAC module- DATC (Dual Automatic Temperature Control) C2109A-23, circuit RH111 (GY/BU), harness side.
- For vehicles with navigation
For vehicles with navigation, measure the resistance between autolamp/sunload sensor C286-4, circuit RH111 (GY/BU), harness side and HVAC module- DATC (Dual Automatic Temperature Control) C228A-10, circuit RH111 (GY/BU), harness side.
Is the resistance less than 5 ohms?
Yes
GO to F4.
No
REPAIR circuit RH111 (GY/BU) for an open. CLEAR the DTCs. REPEAT the self-test. TEST the system for normal operation.
F4 CHECK THE AUTOLAMP/SUNLOAD SENSOR FEEDBACK CIRCUITS FOR AN OPEN
- For DTC B1A64:15, vehicles without navigation
For DTC B1A64:15, vehicles without navigation, measure the resistance between HVAC module- DATC (Dual Automatic Temperature Control) C2109B-19, circuit VH416 (VT/GY), harness side and autolamp/sunload sensor C286-3, circuit VH416 (VT/GY), harness side.
- For DTC B1A64:15, vehicles with navigation
For DTC B1A64:15, vehicles with navigation, measure the resistance between HVAC module- DATC (Dual Automatic Temperature Control) C228B-6, circuit VH416 (VT/GY), harness side and autolamp/sunload sensor C286-3, circuit VH416 (VT/GY), harness side.
- For DTC B1A63:15, vehicles without navigation
For DTC B1A63:15, vehicles without navigation, measure the resistance between HVAC module- DATC (Dual Automatic Temperature Control) C2109B-16, circuit VH417 (YE/OG), harness side and autolamp/sunload sensor C286-1, circuit VH417 (YE/OG), harness side.
- For DTC B1A63:15, vehicles with navigation
For DTC B1A63:15, vehicles with navigation, measure the resistance between HVAC module- DATC (Dual Automatic Temperature Control) C228B-3, circuit VH417 (YE/OG), harness side and autolamp/sunload sensor C286-1, circuit VH417 (YE/OG), harness side.
Is the resistance less than 5 ohms?
Yes
GO to F7.
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.
F5 CHECK THE AUTOLAMP/SUNLOAD SENSOR FEEDBACK CIRCUITS FOR A SHORT TO THE AUTOLAMP/SUNLOAD SENSOR GROUND CIRCUIT
- Ignition OFF.
- Disconnect: HVAC Module- DATC (Dual Automatic Temperature Control) C228A/C2109A.
- Disconnect: HVAC Module- DATC (Dual Automatic Temperature Control) C228B/C2109B.
- Measure the resistance between autolamp/sunload sensor C286-4, circuit RH111 (GY/BU), harness side and autolamp/sunload sensor:
- For DTC B1A64:11, C286-3, circuit VH416 (VT/GY), harness side.
- For DTC B1A63:11, C286-1, circuit VH417 (YE/OG), harness side.
Is the resistance greater than 10,000 ohms?
Yes
GO to F6.
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.
F6 CHECK THE AUTOLAMP/SUNLOAD SENSOR FEEDBACK CIRCUITS FOR A SHORT TO GROUND
- Measure the resistance between ground and autolamp/sunload sensor:
- For DTC B1A64:11, C286-3, circuit VH416 (VT/GY), harness side.
- For DTC B1A63:11, C286-1, circuit VH417 (YE/OG), harness side.
Is the resistance greater than 10,000 ohms?
Yes
GO to F7.
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.
F7 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.