Pinpoint Test C : Unable To Duplicate The Customer Concern And No Diagnostic Trouble Codes (DTCS) Present
- C1 CHECK THE PCM (POWERTRAIN CONTROL MODULE) FOR DIAGNOSTIC TROUBLE CODES (DTCS)
- Ignition ON.
- Using a scan tool, perform PCM self-test.
Are any climate control related Diagnostic Trouble Codes (DTCs) present?
Yes REFER to DTC Chart: Powertrain Control Module (PCM) . No GO to C2 - C2 CHECK THE FCIM (FRONT CONTROLS INTERFACE MODULE) FOR DIAGNOSTIC TROUBLE CODES (DTCS)
- Ignition ON.
- Using a diagnostic scan tool, perform FCIM self-test.
Are any Diagnostic Trouble Codes (DTCs) present?
Yes REFER to DTC Chart: Front Controls Interface Module (FCIM) - Electronic Manual Temperature Control (EMTC) . No GO to C3 - C3 CHECK THE BLOWER MOTOR OPERATION
- Ignition ON.
- Select panel mode.
- Observe blower motor operation and select each blower motor speed.
Does the blower motor operate in all ranges?
Yes GO to C4 No If the blower motor does not operate in any setting, GO to Pinpoint Test J If the blower motor does not correctly change speeds or shut off, GO to Pinpoint Test K - C4 CHECK AIRFLOW OPERATION
- Select the highest blower motor setting.
- While observing the airflow, select each of the airflow positions (panel, panel/floor, floor, floor/defrost, defrost).
Is the airflow directed to the correct outlets?
Yes GO to C5 No GO to Pinpoint Test E - C5 VERIFY TEMPERATURE CONTROL OPERATION
- Start the vehicle and allow it to reach normal operating temperature.
- With the A/C off, select panel mode.
- Change the driver and passenger temperature settings from the coldest to the warmest and back to the coldest.
Does the temperature change between very warm to cool?
Yes GO to C6 No If the temperature does not get very warm, GO to Pinpoint Test F If the temperature does not change at all, GO to Pinpoint Test I - C6 VERIFY THE AIR CONDITIONING COMPRESSOR DOES NOT ENGAGE WITH A/C (AIR CONDITIONING) OFF
- With the engine running and the A/C off, select panel mode.
- Select the coldest temperature setting.
Is the outlet temperature close to ambient air temperature?
Yes GO to C7 No If the temperature is warmer than ambient air temperature, GO to Pinpoint Test I If the outlet temperature is significantly colder than ambient air temperature and the A/C compressor clutch is engaged, GO to Pinpoint Test H - C7 VERIFY THE A/C (AIR CONDITIONING) COMPRESSOR IS OPERATIONAL IN THE A/C (AIR CONDITIONING) MODE
- Make sure the ambient air temperature is above 0°C (32°F).
- With the engine running, select panel mode.
- Press the A/C button (indicator on).
Is the A/C compressor operational when the panel and A/C button (indicator on) is pressed?
Yes GO to C8 No GO to Pinpoint Test G - C8 CHECK THE RECIRCULATED AIR OPERATION
- With the engine running, press the recirculated air button (indicator off).
- Select panel mode.
- Select the highest blower motor setting.
- Observe airflow noise.
- Press the recirculated air button (indicator on).
Does the airflow noise increase when the recirculated air mode is selected (indicator on)?
Yes The system is operating correctly. No GO to Pinpoint Test D