Pinpoint Test F: DTC B1A63:11 and B1A63:15 or DTC B1A64:11 and B1A64:15
Climate Control System
Pinpoint Test F: DTC B1A63:11 and B1A63:15 or DTC B1A64:11 and B1A64:15
Normal Operation
Under normal operation, the autolamp/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
- Autolamp/sunload sensor
- HVAC module
PINPOINT TEST F : DTC B1A63:11 AND B1A63:15 OR DTC B1A64:11 AND 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 RH107 (GN/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 C228A/C2356A.
- Disconnect: HVAC Module C228B/C2356B.
- 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 RETURN CIRCUIT FOR AN OPEN
- Ignition OFF.
- Measure the resistance between autolamp/sunload sensor C286-4, circuit RH107 (GN/BU), harness side and HVAC module C228A/C2356A-10, circuit RH107 (GN/BU), harness side.
Is the resistance less than 5 ohms?
Yes
GO to F4.
No
REPAIR circuit RH107 (GN/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
- DTC B1A64:15
For DTC B1A63:15, measure the resistance between HVAC module C228B/C2356B-6, circuit VH416 (VT/GY), harness side and autolamp/sunload sensor C286-3, circuit VH416 (VT/GY), harness side.
- DTC B1A63:15
For DTC B1A64:15, measure the resistance between HVAC module C228B/C2356B-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 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 RETURN CIRCUIT
- Ignition OFF.
- Disconnect: HVAC Module C228A/C2356A.
- Disconnect: HVAC Module C228B/C2356B.
- Measure the resistance between autolamp/sunload sensor C286-4, circuit RH107 (GN/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 circuit VH417 (YE/OG) or VH416 (VT/GY) for a short to circuit RH107 (GN/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 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.