987.2 cruise control switch replacement method?

[MatHaz]

As posted In August my 987.2 cruise control resume function is not working. I sourced a new switch from a breaker in Canada on eBay & I now have the switch. From guidance I’d read I thought it was just a case of undoing 3 torx T10 screws on the steering columns & swapping the switches by plugging in the new one. Unfortunately on opening the steering column the one screw which needs to be undone to Remove the old switch & done up to instal the neW switch is behind the steering wheel assembly As per the attached photo. I presume this means I will need to remove the steering wheel to access the screw. I’m a little nervous of doing this as I don’t want to disconnect the battery to remove the airbag & face potential error codes etc on re-attaching the battery. Any pointers on the best way forward gratefully received...

 

[STiG911]

Hi
Sorry - you've no choice but to remove the wheel as the bolts for the switch go right through the mechanism, and you absolutely can't do that without disconnecting the battery first.
You shouldn't get any error codes when you reconnect everything - there's a standard method for removing any 987 / 997 wheel, one example of which is this:
https://www.youtube.com/watch?v=X3J8lsro_30

 

[Motorhead]

Mat,

You should be OK if you use the correct method to disconnect the battery by turning on the ignition to stop the alarm going off and then disconnecting the negative terminal.

Here’s some additional information which should be useful when you’ve reconnected the battery.

https://www.porscheclubgb.com/forum/tm.aspx?m=770011

Jeff

 

[Chappelle]

For what it is worth, when I installed mine I only used two screws. I know, not ideal, but it has worked without issue for many many years now

 

[MatHaz]

That’s useful- thanks. Any idea what size socket I need to undo the steering wheel- it seems to be a male socket on the video. Thx

 

[malarcy]

From memory. I think the wheel is held on with a bolt with an m12 spline ”female". I do know that I bought this kit from amazon and one if them fitted. https://www.amazon.co.uk/dp/B0012M7O18/ref=cm_sw_em_r_mt_dp_d9NxFbFY9J1KZ


porsche say the bolt is single use. Doubt it myself. But the new ones are a few pounds and come with thread lock on them. You choose. it has to be tight and there is a specific torque setting for it ( I have it somewhere if you want it )

think the process is ( as per Porsche docs ) turn ignition off, remove mastery lead (negative ) leave it for 30 mins, pup the airbag, undo the nut/bolt.

make sure you mark the wheel and the spindle so you out it back in the right place. Even one spline out can drive you nuts ( guess how I know )

battery. on the 987.2 there is no need to turn ignition on before removing the battery. The alarm doesn’t go off. When I reconnected mine I got PSM errors (they all do that sir). There’s a sequence to reset but basically drive it around the block and it goes away. I had to reset the windows so one touch would work, close the window, let go, close it again, same with open and do both sides.

 

[MatHaz]

Thanks- this is very helpful. I did the job yesterday. Once the steering wheel was off I found I also needed to remove part of the electronics surrounding the steering column to get at the torx 8 nut I needed to undo to remove the current cruise control stalk unit. I did this by releasing the Allen key bolt underneath the steering column & using a flat blade screwdriver to release two catches either side of the steering column.

I found out the correct place for the steering wheel by trial & error- a bit frustrating. I agree the steering wheel but appears to be more than one use. It appears to attach in such a way that there is a space between the top of the steering column female spline and the male nut going into it- I presume this is correct as it appeared to have the correct tolerance of clearance between the back of the steering wheel & the top of the steering column. It would be useful to have the torque setting for the steering column nut.