Pinpoint Test E: DTCs B1A63:11 and 15 or DTCs B1A64:11 and 15
Climate Control System
Pinpoint Tests
Pinpoint Test E: DTCs B1A63:11 and 15 or DTCs B1A64:11 and 15
Refer to Wiring Diagram Set 55, Automatic Climate Control System for schematic and connector information. Diagrams By Number
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 E: DTCs B1A63:11 AND 15 OR DTCs B1A64:11 AND 15
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E1 CHECK THE AUTOLAMP/SUNLOAD SENSOR REFERENCE VOLTAGE
- Ignition OFF.
- Disconnect: Autolamp/Sunload Sensor C287.
- Ignition ON.
- Press the AUTO button.
- Measure the voltage between autolamp/sunload sensor C287-4, circuit GD184 (BK/GY or BK/YE), harness side and autolamp/sunload sensor:
- For DTC B1A63, C287-1, circuit VH416 (VT/GY), harness side.
- For DTC B1A64, C287-3, circuit VH417 (YE/OG), 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 E6.
No
If diagnosing DTC B1A63:15 or DTC B1A64:15, GO to E2.
If diagnosing DTC B1A63:11 or DTC B1A64:11, GO to E5.
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E2 CHECK THE AUTOLAMP/SUNLOAD SENSOR FEEDBACK CIRCUITS FOR A SHORT TO VOLTAGE
- Ignition OFF.
- Disconnect: HVAC Module C228.
- Ignition ON.
- Measure the voltage between ground and autolamp/sunload sensor:
- For DTC B1A63:15, C287-1, circuit VH416 (VT/GY), harness side.
- For DTC B1A64:15, C287-3, 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 E3.
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E3 CHECK THE AUTOLAMP/SUNLOAD SENSOR GROUND CIRCUIT FOR AN OPEN
- Ignition OFF.
- Measure the resistance between ground and autolamp/sunload sensor C287-4, circuit GD184 (BK/GY or BK/YE), harness side.
- Is the resistance less than 5 ohms?
Yes
GO to E4.
No
REPAIR circuit GD184 (BK/GY or BK/YE) for an open. CLEAR the DTCs. REPEAT the self-test. TEST the system for normal operation.
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E4 CHECK THE AUTOLAMP/SUNLOAD SENSOR FEEDBACK CIRCUITS FOR AN OPEN
For DTC B1A63:15
- For DTC B1A63:15, measure the resistance between HVAC module C228-17, circuit VH416 (VT/GY), harness side and autolamp/sunload sensor C287-1, circuit VH416 (VT/GY), harness side.
For DTC B1A64:15
- For DTC B1A64:15, measure the resistance between HVAC module C228-18, circuit VH417 (YE/OG), harness side and autolamp/sunload sensor C287-3, 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.
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E5 CHECK THE AUTOLAMP/SUNLOAD SENSOR FEEDBACK CIRCUITS FOR A SHORT TO GROUND
- Ignition OFF.
- Disconnect: HVAC Module C228.
- Measure the resistance between ground and autolamp/sunload sensor:
- For DTC B1A63:11, C287-1, circuit VH416 (VT/GY), harness side.
- For DTC B1A64:11, C287-3, circuit VH417 (YE/OG), harness side.
- Is the resistance greater than 10,000 ohms?
Yes
GO to E6.
No
REPAIR circuits VH417 (YE/OG) and VH416 (VT/GY) for a short to ground. CLEAR the DTCs. REPEAT the self-test. TEST the system for normal operation.
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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. REFER to Climate Control Heating Ventilation Air Conditioning (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.
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