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

Climate Control System

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

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

C1 CHECK THE HVAC DTCs

- Check for HVAC DTCs.

Is DTC C1B14:11 present?

Yes
GO to C2.

No
GO to C3.

C2 CHECK THE REFERENCE VOLTAGE CIRCUIT 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.

C3 CHECK THE REFERENCE VOLTAGE CIRCUIT 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.

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.