Silverado 2008

Mode Valve Actuator

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Removal & Installation



  1. Before servicing the vehicle, refer to the Precautions Section.
    NOTE
    When performing service on or near the SRS components, or SRS wiring the SRS must be disabled. Failure to observe the correct procedure could cause deployment of the SRS components. Serious injury can occur.

  2.  
  3. Position the steering wheel so the front wheels are in the straight ahead position.
  4.  
  5. Be sure the ignition switch is in the OFF position.
  6.  
  7. Disconnect the negative battery cable.
    NOTE
    The SDM may have more than one fused power input. To ensure that there is no unwanted SRS deployment, personal injury, or unnecessary SRS system repairs, remove all fuses supplying power to the SDM. With all SDM fuses removed and the ignition switch in the ON position, the AIR BAG warning indicator will illuminate. This is normal and does not indicate a SRS system malfunction.

  8.  
  9. Locate and remove the fuses supplying power to the SDM.
  10.  
  11. Wait one minute before working on the vehicle.
  12.  
  13. Remove the knee bolster.

    Click image to see an enlarged view

    Fig. Knee bolster and related components SLT-driver-s side



    Click image to see an enlarged view

    Fig. Knee bolster and related components except SLT-driver-s side



    Click image to see an enlarged view

    Fig. Floor air outlet duct and related components

  14.  
  15. Remove the push pin from the left floor air outlet duct.
  16.  
  17. Remove the left duct. Remove the right duct.
  18.  
  19. Remove the floor air outlet duct.
  20.  
  21. Remove the retaining screws.
  22.  
  23. Remove the component from its mounting.
    NOTE
    Do not apply power to the actuator when it is removed from the HVAC module.

  24.  

To install:


NOTE
Be sure to use new fasteners, as required.

  1. Installation is the reverse of the removal procedure.
  2.  
  3. Recalibrate the actuator.
    NOTE
    The preferred method to recalibrate the actuator is with a scan tool. Using the GM diagnostic scan tool or aftermarket equivalent reprogram the actuator. Be sure to follow the scan tool manufacturer-s directions.

  4.  
  5. If a scan tool is not available, Clear all DTC codes. Position the ignition switch in the OFF position. Remove the HVAC/ECAS fuse for a minimum of ten seconds. Install the fuse. Start the vehicle. Wait forty seconds for the HVAC control module to recalibrate. Verify that no DTC codes have set.
  6.  
  7. Enable the SRS system. Be sure the ignition switch is in the OFF position. Install the fuses. Connect the negative battery cable. Turn the ignition switch to the ON position. If the system is operating properly the AIR BAG indicator will flash.
  8.  

 
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