Rotary switch bulb replacement guide

[Error404]

Hi guys - had to replace the bulbs in my new heated seat switches, so thought i'd do a quick how-to. Apologies for the rather poor quality pics
This will work for the rotary dash switches - so the heated seat switches and also the headlight adjustment switch.

First, carefully prise the switch out of the rail using a flatblade.

Pull the switch off the loom and onto you desk / bench.


Carefully prise the face off at the edge again using a flatblade.


Next you want to prise the casing off the switch mechanism itself. I used a sharp knife. Lever against the 4 barbed plastic tabs (2 on each side)


Then slide the housing off the switch assembly


Next, use your trusty flatblade to lever the red plastic casing off the circuit board. This is held on with little studs that are fitted into the circuit board itself. The rotary wheel will come away upward with it - be careful to keep the wheel and red casing together - there is a tiny metal ball bearing which gives the "click" onto each setting - this is VERY easy to lose!!!


If you are curious like me, this is where it sits under the wheel.


Now you need to remove that blown bulb. Heat up your soldering iron if you haven't done so already

You ahve probably guessed alreayd that this is your problem: Unsolder it then bin it

[Acidburn]

Lol i'll bring some of these up for you to do for me.

I know the headlight aim one's are the same as this right pita.

[Error404]

To replace it you need a sub-miniature 12v bulb - easy to find in Maplin or the like. I used red to match the rest of my bulbs, but amber, blue etc will work also

N.B. all the T6 size bulbs i tried that fit the other switches and dash illumination are too big to fit in the red plastic housing on the rotary switches, so use proper sub-min ones to be sure

Anyhoo, solder that little puppy in place, careful not to bridge the connections on the board with too much solder.

Then in true Haynes Stylee, refitting is a reversal of removal.

*** Little tip - if your soldering is $hite like mine, test the board in the car before reassembling the switch just to make sure it works ***


Here is the result:


HTH Someone

cheers
Alex

[Error404]

yeaj no worries mate, get some blubs i'll do 'em when you're up next

[k.alle]

As a side note:

Did these in my S2 ABY -94, and they had a far more complex circuit board.
And IIRC it was a bit more hard worked to change, but still manageable.