Pinpoint Test C: DTC C1B14
Climate Control System
Pinpoint Tests
Pinpoint Test C: DTC C1B14
Refer to Wiring Diagram Set 54, Manual Climate Control System for schematic and connector information. Diagrams By Number
Refer to Wiring Diagram Set 55, Automatic Climate Control System for schematic and connector information. Diagrams By Number
Normal Operation
Under normal operation, a 5-volt reference voltage is supplied to the sensors and actuators from the HVAC module through circuit LH111 (BN/WH).
- DTC C1B14:11 Sensor Supply Voltage A: Circuit Short to Ground - The module senses less than 0.1 volt on the sensor reference voltage circuit, indicating a short directly to ground.
- DTC C1B14:12 Sensor Supply Voltage A: Circuit Short to Battery - The module senses greater than 4.9 volts on the sensor reference voltage circuit, indicating a short directly to voltage.
This pinpoint test is intended to diagnose the following:
- Wiring, terminals or connectors
- HVAC module
PINPOINT TEST C: DTC C1B14
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C1 CHECK THE SENSOR RESISTANCE
- Check for HVAC DTCs.
- Is DTC C1B14:11 present?
Yes
GO to C2.
No
GO to C4.
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C2 CHECK CIRCUIT LH111 (BN/WH) FOR A SHORT TO GROUND
- Ignition OFF.
- Disconnect: HVAC Module C228a.
- Disconnect: HVAC Module C228b.
- Measure the resistance between ground and HVAC module C228a-11, circuit LH111 (BN/WH), harness side.
- Is the resistance greater than 10,000 ohms?
Yes
GO to C3.
No
REPAIR circuit LH111 (BN/WH) for a short to ground. CLEAR the DTCs. REPEAT the self-test. TEST the system for normal operation.
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C3 CHECK CIRCUITS LH111 (BN/WH) AND RH111 (GY/BU) FOR A SHORT TOGETHER
- Measure the resistance between HVAC module C228a-11, circuit LH111 (BN/WH), harness side and HVAC module C228a-10, circuit RH111 (GY/BU), harness side.
- Is the resistance greater than 200 ohms?
Yes
GO to C5.
No
REPAIR circuits LH111 (BN/WH) and RH111 (GY/BU) for a short together. CLEAR the DTCs. REPEAT the self-test. TEST the system for normal operation.
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C4 CHECK CIRCUIT LH111 (BN/WH) FOR A SHORT TO VOLTAGE
- Ignition OFF.
- Disconnect: HVAC Module C228a.
- Disconnect: HVAC Module C228b.
- Measure the voltage between ground and HVAC module C228a-11, circuit LH111 (BN/WH), harness side.
- Is any voltage present?
Yes
REPAIR circuit LH111 (BN/WH) for a short to voltage. CLEAR the DTCs. REPEAT the self-test. TEST the system for normal operation.
No
GO to C5.
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C5 CHECK THE MODULE CONNECTION
- Carry out the HVAC Module Cold Boot Process. HVAC Module Cold Boot Process
- Carry out the HVAC Module On-Demand Self Test. Alternate Diagnostic Methods - HVAC Module
- Operate the system.
- Does the concern return?
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.
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