Pinpoint Test C: DTCs C1B14:11 and 12
Climate Control System
Pinpoint Test C: DTCs C1B14:11 and 12
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)- This continuous memory DTC sets when the HVAC module senses less than a calibrated voltage on the sensor reference voltage circuit, indicating a short directly to ground.
- DTC C1B14:12 (Sensor Supply Voltage A: Circuit Short to Battery)- This continuous memory DTC sets when the HVAC module senses greater than a calibrated voltage 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 HVAC MODULE DTCs
- Ignition ON.
- Check for HVAC module DTCs.
Is DTC C1B14:11 present?
Yes
GO to C2.
No
GO to C5.
C2 CHECK THE REFERENCE VOLTAGE CIRCUIT 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:
- For EMTC (Electronic Manual Temperature Control) systems, HVAC Module- EMTC (Electronic Manual Temperature Control) C2357-24, circuit LH111 (BN/WH), harness side.
- For DATC (Dual Automatic Temperature Control) systems, HVAC module- DATC (Dual Automatic Temperature Control) C228A-24, 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 AND THE SIGNAL RETURN CIRCUIT FOR A SHORT TOGETHER
- Measure the resistance between:
- For EMTC (Electronic Manual Temperature Control) systems, HVAC Module- EMTC (Electronic Manual Temperature Control) C2357-24, circuit LH111 (BN/WH), harness side and HVAC module- EMTC (Electronic Manual Temperature Control) C2357-23, circuit RH111 (GY/BU), harness side.
- For DATC (Dual Automatic Temperature Control) systems, HVAC module- DATC (Dual Automatic Temperature Control) C228A-24, circuit LH111 (BN/WH), harness side and HVAC module- DATC (Dual Automatic Temperature Control) C228A-23, circuit RH111 (GY/BU), harness side.
Is the resistance greater than 200 ohms?
Yes
GO to C6.
No
GO to C4.
C4 CHECK THE ACTUATORS
- Measure the resistance between:
- For EMTC (Electronic Manual Temperature Control) systems, HVAC Module- EMTC (Electronic Manual Temperature Control) C2357-24, circuit LH111 (BN/WH), harness side and HVAC module- EMTC (Electronic Manual Temperature Control) C2357-23, circuit RH111 (GY/BU), harness side.
- For DATC (Dual Automatic Temperature Control) systems, HVAC module- DATC (Dual Automatic Temperature Control) C228A-24, circuit LH111 (BN/WH), harness side and HVAC module- DATC (Dual Automatic Temperature Control) C228A-23, circuit RH111 (GY/BU), harness side.
- While measuring the resistance, disconnect the following components one at a time, in order. Stop disconnecting components if the measured resistance rises above 200 ohms.
- Defrost/panel/floor door actuator C2278
- LH temperature blend door actuator C2091
- (DATC (Dual Automatic Temperature Control) only) RH temperature blend door actuator C2092
Did the resistance rise above 200 ohms?
Yes
INSTALL a new actuator (the last one to be disconnected). When installing an actuator, CONNECT the actuator electrical connector before the HVAC module connector(s). This allows the actuator to be calibrated when the HVAC module is reconnected. TEST the system for normal operation.
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.
C5 CHECK THE REFERENCE VOLTAGE CIRCUIT 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:
- For EMTC (Electronic Manual Temperature Control) systems, HVAC Module- EMTC (Electronic Manual Temperature Control) C2357-24, circuit LH111 (BN/WH), harness side.
- For DATC (Dual Automatic Temperature Control) systems, HVAC module- DATC (Dual Automatic Temperature Control) C228A-24, 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 C6.
C6 CHECK THE HVAC MODULE CONNECTION
- Inspect the HVAC module component and harness side connectors for:
- corrosion
- damaged pins
- pushed-out terminals
- Connect and correctly seat all the HVAC module connectors.
- Clear the DTCs.
- Enter the following diagnostic mode on the scan tool: Self-Test- HVAC Module.
- 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. TEST the system for normal operation.