Unable To Change HVAC System Modes (Update HVAC Control Module Software)
| Subject: | Unable To Change HVAC System Modes (Update HVAC Control Module Software) |
| Models: | 2006 Chevrolet Impala, Monte Carlo |
| with Manual Control HVAC System (RPO CJ3) or Automatic Control HVAC System (RPO C67) |
Condition
Some customers may comment that they are unable to change the modes in their Heating, Ventilation and Air Conditioning (HVAC) system or that the air is misdirected from the selected mode. The system will reset itself if turned to the defrost mode but the lockup could occur again when moved to other modes.
Cause
This condition may be caused by a logic lock-up in the HVAC control module.
Correction
Do This | Don't Do This |
|---|---|
Update the HVAC control module software. | Do not replace the HVAC control module. |
Technicians are to reprogram the HVAC control module with an updated software calibration. The new calibration was released beginning with TIS satellite data update version 6.5 which was made available on June 12, 2006. As always, make sure your Tech 2® is updated with the latest software version.
It is recommended that the HVAC actuators be recalibrated after the HVAC control module software is updated. Refer to Re-Calibrating Actuators in the HVAC section of SI for more information.
Warranty Information
For vehicles repaired under warranty, use:
Labor Operation | Description | Labor Time |
|---|---|---|
D4707* | HVAC Control Head Module or Assembly - Reprogramming with SPS | 0.4 hr |
*This labor operation is for bulletin use only. It will not be published in the Labor Time Guide. | ||
