For 1990-2009 cars

### Removal Procedure

1. Gently pull the 4 knobs from the heater control unit.
2. Remove the heater control unit face plate (3) from the center trim bezel by pulling the face plate straight out.
3. Remove the illumination lamp bulb socket (1) from the heater control unit face plate.
4. Remove the bulb from the lamp socket.

### Installation Procedure

1. Install the bulb to the lamp socket.
2. Install the illumination lamp bulb socket (1) to the heater control unit face plate.
3. Install the heater control unit face plate to the instrument panel by pushing the face plate until the plate snaps into place.
4. Install the heater control unit knobs.