Mod Details
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Heater Control Bulbs
There are 3 bulbs that illuminate the heater controls on the 454 forfour.
Remove the heater control panel from the car and lever the 3 clips open…
![](/wp-content/uploads/smartlights/forfour/heaterlight1.jpg)
…and separate the 2 halves.
![](/wp-content/uploads/smartlights/forfour/heaterlight2.jpg)
The 6 buttons, 3 LEDs and 3 bulbs are now visible.
![](/wp-content/uploads/smartlights/forfour/heaterlight3.jpg)
The bulbs sit above or below a central LED used to light the on/off illumination in the centre of the knobs. The bulb illuminates the dials that sit around the outside of the knobs. To remove them, you just have to twist them a quarter turn anti-clockwise and then pull them from the board.
![](/wp-content/uploads/smartlights/forfour/heaterlight4.jpg)
These are the 3 bulbs that have been removed, They are quarter turn twist fit bulbs that look similar to the 509T type, however they aren’t.
![](/wp-content/uploads/smartlights/forfour/heaterlight5.jpg)
The bulb on the left was removed from the heater control, the one on the right is a 509T. Too big.
The 509T pushes in from behind whereas the smaller twist fit bulb pushes in from the front.
![](/wp-content/uploads/smartlights/forfour/heaterlight6.jpg)
You can buy replacements from smart and possibly Mitsubishi as the heater controller is very similar to the Mitsubishi Colt.
The smart number numbers are either A 454 820 00 21 or A 454 820 15 21
These are custom sized bulb bases used by Mitsubishi. I haven’t found LEDs of these.