Pinpoint Test C: DTC C1B14:11 And C1B14:12

Climate Control System

Pinpoint Test C: DTC C1B14:11 and C1B14:12

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.

- 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 C1B14:11 AND C1B14:12

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C1 CHECK THE HVAC DTCs


- Check for HVAC DTCs.
- Is DTC C1B14:11 present?

Yes
GO to C2.

No
GO to C3.

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C2 CHECK CIRCUIT LH111 (BN/WH) FOR A SHORT TO GROUND


- Ignition OFF.
- Disconnect: HVAC Module C228A/C2356A.
- Disconnect: HVAC Module C228B/C2356B.
- Measure the resistance between ground and HVAC module C228A/C2356A-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 CIRCUIT LH111 (BN/WH) FOR A SHORT TO VOLTAGE


- Ignition OFF.
- Disconnect: HVAC Module C228A/C2356A.
- Disconnect: HVAC Module C228B/C2356B.
- Measure the voltage between ground and HVAC module C228A/C2356A-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 C4.

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C4 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.

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