Pinpoint Test N : The Air Conditioning (A/C) Is Always On - A/C Mode Always Commanded On
- N1 CHECK THE AIR CONDITIONING SWITCH STATUS (CC_SW_AC) FCIM PID WITH THE A/C OFF
- Ignition ON.
- Enter the following diagnostic mode on the scan tool: Front Controls Interface Module (FCIM) DataLogger.
- Monitor the CC_SW_AC FCIM PID
- Select PANEL press the A/C button (indicator off) on the HVAC controls.
Does the CC_SW_AC HVAC PID read Inactive?
Yes GO to N2. No INSTALL a new Front Controls Interface Module (FCIM). REFER to Information and Entertainment Systems . TEST the system for normal operation. - N2 CHECK THE AIR CONDITIONING REQUEST SIGNAL (AC_REQ) PCM PID WITH THE A/C OFF
- Enter the following diagnostic mode on the scan tool: PCM DataLogger.
- Select PANEL press the A/C button (indicator off) on the HVAC controls.
- Monitor the AC_REQ PCM PID
Does the AC_REQ PCM PID read OFF?
Yes GO to N5. No GO to N3. - N3 CHECK THE AIR CONDITIONING REQUEST SIGNAL (AC_REQ) PCM PID WITH HVAC MODULE DISCONNECTED
- Disconnect: HVAC Module - Electronic Manual Temperature Control (EMTC) C2357.
- Disconnect: HVAC Module - Dual Automatic Temperature Control (DATC) C228A.
- Enter the following diagnostic mode on the scan tool: PCM DataLogger.
- Monitor the AC_REQ PCM PID
Does the AC_REQ PCM PID read OFF?
Yes GO to N4. No GO to N5. - N4 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. REFER to Climate Control . 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. - Inspect the HVAC module component and harness side connectors for:
- N5 CHECK THE PCM CONNECTION
- Disconnect all the PCM connectors.
- Inspect the PCM component and harness side connectors for:
- corrosion
- damaged pins
- pushed-out terminals
- Connect and correctly seat all the PCM connectors.
- Clear the DTCs.
- Enter the following diagnostic mode on the scan tool: Self-Test - PCM.
- Operate the system and verify the concern is still present.
Is the concern still present?
Yes INSTALL a new PCM. REFER to Electronic Engine Controls . 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.