C1B14:11

Climate Control System

Pinpoint Test C: DTCs C1B14:11 and 12

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.

- 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 : DTCs C1B14:11 AND 12

C1 CHECK THE SENSOR RESISTANCE

- Check for HVAC DTCs.

Is DTC C1B14:11 present?

Yes
GO to C2.

No
GO to C4.

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

- Ignition OFF.

- Disconnect: HVAC Module- Electronic Manual Temperature Control (EMTC) C2357.

- Disconnect: HVAC Module- Dual Automatic Temperature Control (DATC) C228A.

- Disconnect: HVAC Module- DATC (Dual Automatic Temperature Control) C228B.

- Measure the resistance between ground and:
- (EMTC (Electronic Manual Temperature Control) systems) HVAC module- EMTC (Electronic Manual Temperature Control) C2357-3, circuit LH111 (BN/WH), harness side.

- (DATC (Dual Automatic Temperature Control) systems) HVAC module- DATC (Dual Automatic Temperature Control) C228A-3, 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 CIRCUITS LH111 (BN/WH) AND RH107 (GN/BU) FOR A SHORT TOGETHER

- Measure the resistance between:
- (EMTC (Electronic Manual Temperature Control) systems) HVAC module- EMTC (Electronic Manual Temperature Control) C2357-3, circuit LH111 (BN/WH), harness side and HVAC module- EMTC (Electronic Manual Temperature Control) C2357-4, circuit RH107 (GN/BU), harness side.

- (DATC (Dual Automatic Temperature Control) systems) HVAC module- DATC (Dual Automatic Temperature Control) C228A-3, circuit LH111 (BN/WH), harness side and HVAC module- DATC (Dual Automatic Temperature Control) C228A-4, circuit RH107 (GN/BU), harness side.






Is the resistance greater than 200 ohms?

Yes
GO to C5.

No
REPAIR circuits LH111 (BN/WH) and RH107 (GN/BU) for a short together. CLEAR the DTCs. REPEAT the self-test. TEST the system for normal operation.

C4 CHECK CIRCUIT LH111 (BN/WH) FOR A SHORT TO VOLTAGE

- Ignition OFF.

- Disconnect: HVAC Module- EMTC (Electronic Manual Temperature Control) C2357.

- Disconnect: HVAC Module- DATC (Dual Automatic Temperature Control) C228A.

- Disconnect: HVAC Module- DATC (Dual Automatic Temperature Control) C228B.

- Ignition ON.

- Measure the voltage between ground and:
- (EMTC (Electronic Manual Temperature Control) systems) HVAC module- EMTC (Electronic Manual Temperature Control) C2357-3, circuit LH111 (BN/WH), harness side.

- (DATC (Dual Automatic Temperature Control) systems) HVAC module- DATC (Dual Automatic Temperature Control) C228A-3, 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.

C5 CHECK THE 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.