Pinpoint Test I: Unable to Duplicate the Customer Concern and No DTCs Present
Climate Control System
Pinpoint Tests
Pinpoint Test I: Unable to Duplicate the Customer Concern and No DTCs Present
Normal Operation
The purpose of this pinpoint test is to test the functions of the HVAC system and to identify the correct pinpoint test HVAC symptom.
PINPOINT TEST I: UNABLE TO DUPLICATE THE CUSTOMER CONCERN AND NO DTCs PRESENT
NOTE: Diagnose any HVAC module DTCs before carrying out the following pinpoint test.
NOTE: Some PCM DTCs may inhibit A/C operation. If any PCM DTCs are retrieved, diagnose those first. Refer to the PCM DTC Chart. PCM DTC Chart
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I1 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 selections and change speed in each?
Yes
GO to I2.
No
If the blower motor does not operate in any setting, GO to Pinpoint Test Q. Pinpoint Test Q: The Blower Motor Is Inoperative
If the blower motor does not properly change speeds or shut OFF, GO to Pinpoint Test R. Pinpoint Test R: The Blower Motor Does Not Operate Correctly
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I2 CHECK AIRFLOW OPERATION
- Select the highest blower motor setting.
- NOTE: Refer to Description and Operation for proper airflow descriptions.
- While observing the airflow, select each of the airflow positions (PANEL, PANEL/FLOOR, FLOOR, FLOOR/DEFROST, DEFROST).
- Is the airflow directed to the proper outlets?
Yes
GO to I3.
No
GO to Pinpoint Test K. Pinpoint Test K: Incorrect/Erratic Direction of Airflow From Outlets
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I3 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 temperature setting from the coldest to the warmest and back to the coldest.
- Does the temperature change between very warm to cool?
Yes
GO to I4.
No
If the temperature does not get very warm, GO to Pinpoint Test L. Pinpoint Test L: Insufficient, Erratic or No Heat
If the temperature does not change at all, GO to Pinpoint Test P. Pinpoint Test P: Temperature Control Is Inoperative/Does Not Operate Correctly
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I4 VERIFY THE A/C CLUTCH DOES NOT ENGAGE WITH A/C OFF
- With the A/C OFF, select PANEL mode.
- Select the coldest temperature setting.
- Select a medium-low blower speed.
- Is the outlet temperature close to ambient temperature?
Yes
GO to I5.
No
If the temperature is warmer than ambient temperature, GO to Pinpoint Test P and diagnose for inoperative blend door. Pinpoint Test P: Temperature Control Is Inoperative/Does Not Operate Correctly
If the outlet temperature is significantly colder than ambient temperature and the A/C compressor clutch cycles normally, GO to Pinpoint Test O. Pinpoint Test O: The Air Conditioning (A/C) is Always On - A/C Mode Always Commanded On
If the outlet temperature is significantly colder than ambient temperature and the A/C compressor clutch is engaged and does not cycle, GO to Pinpoint Test N. Pinpoint Test N: The Air Conditioning (A/C) is Always On - A/C Compressor Does Not Cycle
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I5 VERIFY A/C CLUTCH ENGAGEMENT IN THE A/C MODE
- Make sure the ambient air temperature is above 2°C (35°F).
- Select PANEL mode.
- Press the A/C button (indicator ON).
- Does the A/C clutch engage when the PANEL and A/C button (indicator ON) is pressed?
Yes
GO to I6.
No
GO to Pinpoint Test M. Pinpoint Test M: The Air Conditioning (A/C) is Inoperative
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I6 CHECK THE RECIRC OPERATION
- Press the RECIRC button (indicator OFF).
- Select PANEL mode.
- Select the highest blower motor setting.
- Observe airflow noise.
- Press the RECIRC button (indicator ON).
- Does the airflow noise increase when the RECIRC mode is selected (indicator ON)?
Yes
GO to I7.
No
GO to Pinpoint Test J. Pinpoint Test J: The Air Inlet Door Is Inoperative
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I7 CHECK THE AUXILIARY BLOWER MOTOR OPERATION
- Using the front and rear auxiliary blower motor controls, observe blower motor operation and select each auxiliary blower motor speed.
- Does the auxiliary blower motor operate in all selections and change speed in each?
Yes
GO to I8.
No
If the auxiliary blower motor does not operate in any setting, GO to Pinpoint Test S. Pinpoint Test S: The Auxiliary Blower Motor Is Inoperative
If the auxiliary blower motor does not properly change speeds or shut OFF using both the front and rear auxiliary controls, GO to Pinpoint Test T. Pinpoint Test T: The Auxiliary Blower Motor Does Not Operate Correctly
If the auxiliary blower motor does not properly change speeds or shut OFF using the rear auxiliary controls only, GO to Pinpoint Test W. Pinpoint Test W: The Auxiliary Temperature, Panel/Floor or Blower Motor Controls are Inoperative/Do Not Operate Correctly Using
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I8 VERIFY AUXILIARY TEMPERATURE/MODE OPERATION
- Select the highest auxiliary blower motor setting.
- Using the front and rear auxiliary controls, change the temperature/mode setting from the coldest to the warmest/floor and back to the coldest/overhead.
- Does the temperature change between very warm to cool and auxiliary airflow to the floor when warm is selected and headliner when cool is selected?
Yes
The system is operating normally.
No
If the auxiliary temperature control is inoperative/does not operate correctly from the front/rear auxiliary controls, GO to Pinpoint Test U. Pinpoint Test U: The Auxiliary Temperature Control is Inoperative/Does Not Operate Correctly Using the Front/Rear Auxiliary Cli
If the auxiliary temperature control is inoperative/does not operate correctly from the front auxiliary controls only, INSTALL a new HVAC module. REFER To Climate Control Heating Ventilation Air Conditioning (HVAC) Module. TEST the system for normal operation.
If the auxiliary temperature control is inoperative/does not operate correctly from the rear auxiliary controls only, GO to Pinpoint Test W. Pinpoint Test W: The Auxiliary Temperature, Panel/Floor or Blower Motor Controls are Inoperative/Do Not Operate Correctly Using
If the auxiliary panel/floor control is inoperative/does not operate correctly from the front/rear auxiliary controls, GO to Pinpoint Test V. Pinpoint Test V: The Auxiliary Panel/Floor Control is Inoperative/Does Not Operate Correctly Using the Front/Rear Auxiliary Cli
If the auxiliary panel/floor control is inoperative/does not operate correctly from the front auxiliary controls only, INSTALL a new HVAC module. REFER to Climate Control Heating Ventilation Air Conditioning (HVAC) Module. TEST the system for normal operation.
If the auxiliary panel/floor control is inoperative/does not operate correctly from the rear auxiliary controls only, GO to Pinpoint Test W. Pinpoint Test W: The Auxiliary Temperature, Panel/Floor or Blower Motor Controls are Inoperative/Do Not Operate Correctly Using
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