IN-VEHICLE CALIBRATION
Note. Whenever HVAC (Heater Vent & Air Conditioner) control module, HVAC unit, doors or door actuators are replaced, actuator calibration/diagnostics test must be performed.
- If REAR WIPER and INTERMITTENT button LEDs flash simultaneously when ignition is turned on, actuators have not been calibrated or a previous calibration failure occurred. Diagnostics will always occur during calibration. Mode and blend door calibration compensates for mechanical differences in actuators, heater unit and its linkages. In-vehicle calibration and cool-down test is entered using switches and buttons on HVAC front panel.
- To enter calibration/diagnostics test, set parking brake. Start and warm engine to normal operating temperature. With engine idling, turn blower switch to high. Turn mode switch to panel. Open all A/C outlets. Move temperature lever to full cold.
- Press and hold REAR WASH and REAR WIPER buttons simultaneously for 5 seconds (until all LEDs illuminate). All LEDs should illuminate for 5 seconds. REAR WIPER and INTERMITTENT button LEDs will flash alternately during calibration test. A/C and RECIRC button LEDs will alternately flash during cool-down test.
- After approximately 60 seconds, if only REAR WIPER button LED is flashing, calibration is successful and system is okay. If REAR WIPER and INTERMITTENT button LEDs are flashing, see «DIAGNOSTICS»(ref-39555-S13678340162001011200000) under TROUBLE SHOOTING for diagnostic procedures.
- To exit calibration/diagnostics test at any time, press REAR WIPER button or cycle ignition off and then on. Test will automatically terminate 15 minutes after calibration/diagnostics is entered.