Removal Procedure

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Remove the auxiliary rear HVAC control assembly. Refer to HVAC CONTROL ASSEMBLY REPLACEMENT - REAR AUXILIARY .
Remove the auxiliary HVAC control processor (2) from the bracket (3).

Fig 1: Removing Auxiliary HVAC Control Processor From Bracket
Courtesy of GENERAL MOTORS CORP.
Remove the cover from the auxiliary HVAC control processor (2).
Remove the auxiliary HVAC control processor (2) from the box (1).

Fig 2: Removing Auxiliary HVAC Control Processor From Box
Courtesy of GENERAL MOTORS CORP.