The first step in working on the control assembly is to disconnect the negative
Battery Cable. After you remove the control bezel and control from the instrument panel, separate the wiring harness from the main switch. Lift out the plastic control cap and unscrew the control mounting screws. To attach the control, put it on the bezel and tighten it in place with the screws, before linking the harness to the control. Guide the bezel with the instrument panel and insert the bezel and control together, being careful not to squeeze the control knobs. In the end, attach the negative battery cable back to the car's negative terminal.