Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
2008 Buick Enclave CX, AWDFACTORY OEM SERVICE PROCEDURE
Auxiliary Heater and Air Conditioning Control Module Scan Tool Information
Rear HVAC/RSA Scan Tool Data Parameters
| Parameter | System State | Expected Value | Definition |
|---|---|---|---|
| Operating Conditions: Ignition ON | |||
| Battery Voltage | - | Varies | This displays volts. This is the voltage input supplied to the rear HVAC. |
| Display Dimming Signal | - | Varies | This displays volts. This is the current voltage supplied to the rear HVAC display dimming. |
| Left Rear Heated Seat Switch | - | Inactive | The scan tool displays Active or Inactive. This is the state of the left rear heated seat switch. |
| Power Button | - | Inactive | The scan tool displays Active or Inactive. This is the state of the rear seat audio system. |
| Program Switch | - | Inactive | The scan tool displays Active or Inactive. This is the state of the rear seat audio program switch. |
| Rear Audio Seek Down Switch | - | Inactive | The scan tool displays Active or Inactive. This is the state of the rear audio seek down switch. |
| Rear Audio Seek Up Switch | - | Inactive | The scan tool displays Active or Inactive. This is the state of the rear audio seek up switch. |
| Rear HVAC Fan Down Sw. | - | Inactive | The scan tool displays Active or Inactive. This is the state of the rear HVAC fan down switch. |
| Rear HVAC Fan Down Sw. | - | Inactive | The scan tool displays Active or Inactive. This is the state of the rear HVAC fan up switch. |
| Rear Temperature Down Switch | - | Inactive | The scan tool displays Active or Inactive. This is the state of the rear temperature down switch. |
| Rear Temperature Up Switch | - | Inactive | The scan tool displays Active or Inactive. This is the state of the rear temperature up switch. |
| Right Rear Heated Seat Switch | - | Inactive | The scan tool displays Active or Inactive. This is the state of the right rear heated seat switch. |
| Source | - | Inactive | The scan tool displays Active or Inactive. This is the state of the rear audio source switch. |
Rear HVAC/RSA Scan Tool Output Controls
| Scan Tool Output Control | Description |
|---|---|
| Display(s) Test | The rear HVAC/RSA module will illuminate all indicators and display segments on the module display. |
| Infrared Transmitter Power Control | The rear HVAC/RSA module will activate the infrared transmitter, which sends wireless signals to the RSA headphones. |
Factory Service Tools
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.
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