Multi-function Switch/Headlight switch replacement?
Joined: May 2017
Posts: 14
Likes: 0
From: Charleston sc
Re: Multi-function Switch/Headlight switch replacement?
Thank you very much guys, my part will be here pretty soon. Both passenger side blinkers don't work as of recently. They sometimes work for the first few right turns of my drive. I did some research and found that this is most likely the problem, I will let ya'll know how it goes. Things really start acting up at 130k miles 
Joined: May 2017
Posts: 14
Likes: 0
From: Charleston sc
Re: Multi-function Switch/Headlight switch replacement?
Update. I have replaced the multi function switch recently and it fixed my problem. On another note, since the replacement my airbag light is on. Does anybody know how i can fix this or what the problem may be? I am going to pull the steering wheel airbag off tomorrow, unplug and re plug in the airbag. Maybe i failed to plug it in all the way?
Senior Member
Joined: Sep 2015
Posts: 1,465
Likes: 4
From: Knoxville
Re: Multi-function Switch/Headlight switch replacement?
Stop.... Make sure you remove the battery cables BEFORE you attempt to unplug the airbag. If not ,you will be going to a dealer to have that reset..
Senior Member
Joined: Apr 2006
Posts: 25,432
Likes: 647
From: Ontario
Re: Multi-function Switch/Headlight switch replacement?
Too late for that bit of advice as the light is on now.
Joined: May 2017
Posts: 14
Likes: 0
From: Charleston sc
Re: Multi-function Switch/Headlight switch replacement?
I did indeed unplug the negative terminal and shield it from the battery a full hour before doing the job and taking things apart. Is their anything else that could of done it? even so am i screwed and have to take it to the dealer to have it reset?
Senior Member
Joined: Dec 2010
Posts: 12,780
Likes: 184
From: Lineville, AL
Re: Multi-function Switch/Headlight switch replacement?
It can be reset with a Launch CRP 123 scanner ( $150 at Amazon ).
Nice scanner to have on hand anyway.
Heck, dealer ( stealer ) would probably charge that anyway, AND find 3 or 4 other things that you just GOT to have fixed.
BTW, Crystal here on the forum verified that it works ! ( I had let her borrow my CRP 123 )
Nice scanner to have on hand anyway.
Heck, dealer ( stealer ) would probably charge that anyway, AND find 3 or 4 other things that you just GOT to have fixed.
BTW, Crystal here on the forum verified that it works ! ( I had let her borrow my CRP 123 )
Joined: May 2017
Posts: 14
Likes: 0
From: Charleston sc
Re: Multi-function Switch/Headlight switch replacement?
Thanks i really appreciate the information guy's. I am going to check with my local shop to see if they can clear it, i really like them a lot. if not ill buy the scanner and it will be nice to have. Crossfire owners are lucky to have this forum because nobody seems to know a damn thing about our cars in our local worlds.
Joined: Dec 2019
Posts: 109
Likes: 23
From: Cincinnati
Re: Multi-function Switch/Headlight switch replacement?
Got the job done, only took me 4 or so hours with my ADD. Not bad - a brake job takes me longer, lol.
The junkyard unit had some corrosion on the aluminum casting, and some of the connections seemed a little iffy. Upon pulling the switch out of my steering column, it was in visually better shape, so I was worried that my replacement wasn't going to work but I went through with it. Turn signals both work, high beams and even flash-to-pass now work. Really relieved that I've finally done this after 3 years this month of owning this car and the issue getting steadily worse.
Some issues I came across during the replacement:
The countersunk 10MM screw holding the steering wheel on was a pain - if I had a friend it would've been easy to hold it still and turn the breaker bar, however I managed to get my foot on it and steady the wheel enough to break it loose. An impact probably would've done it too but I don't have air in my garage.
The two electrical connector retainers in the multifunction switch for the clockspring had me confused for quite a while until I realized I had to pry two tabs down instead of one to slide them through.
A lot of screws were missing in the lower instrument panel, it's apparent that it's been removed before. It was a pain getting the instrument panel back in place because gravity really didn't want to let it go while I was trying to start the screws in it, but after some wiggling I could hold my knee against the bolsters to hold it in place.
I was going to make a writeup on it because there's very little said on here about replacing the multifunction switch as far as time, cost, other potential parts needed, but I found a thorough writeup for the R170 SLK that was exactly the same for our non-SRT cars apart from us not having a screw in the driver side air nozzle vent, which you pry out around the edges with a plastic wedge tool instead. That write-up, with photos can be found here: Mercedes-Benz SLK 230 Turn Signal Stalk and Combination Switch Replacement | 1998-2004 | Pelican Parts DIY Maintenance Article
Multifunction switch Mercedes-Benz part #170 540 03 44
The junkyard unit had some corrosion on the aluminum casting, and some of the connections seemed a little iffy. Upon pulling the switch out of my steering column, it was in visually better shape, so I was worried that my replacement wasn't going to work but I went through with it. Turn signals both work, high beams and even flash-to-pass now work. Really relieved that I've finally done this after 3 years this month of owning this car and the issue getting steadily worse.
Some issues I came across during the replacement:
The countersunk 10MM screw holding the steering wheel on was a pain - if I had a friend it would've been easy to hold it still and turn the breaker bar, however I managed to get my foot on it and steady the wheel enough to break it loose. An impact probably would've done it too but I don't have air in my garage.
The two electrical connector retainers in the multifunction switch for the clockspring had me confused for quite a while until I realized I had to pry two tabs down instead of one to slide them through.
A lot of screws were missing in the lower instrument panel, it's apparent that it's been removed before. It was a pain getting the instrument panel back in place because gravity really didn't want to let it go while I was trying to start the screws in it, but after some wiggling I could hold my knee against the bolsters to hold it in place.
I was going to make a writeup on it because there's very little said on here about replacing the multifunction switch as far as time, cost, other potential parts needed, but I found a thorough writeup for the R170 SLK that was exactly the same for our non-SRT cars apart from us not having a screw in the driver side air nozzle vent, which you pry out around the edges with a plastic wedge tool instead. That write-up, with photos can be found here: Mercedes-Benz SLK 230 Turn Signal Stalk and Combination Switch Replacement | 1998-2004 | Pelican Parts DIY Maintenance Article
Multifunction switch Mercedes-Benz part #170 540 03 44
Joined: Dec 2019
Posts: 109
Likes: 23
From: Cincinnati
Re: Multi-function Switch/Headlight switch replacement?
Got the job done, only took me 4 or so hours with my ADD. Not bad - a brake job takes me longer, lol.
The junkyard unit had some corrosion on the aluminum casting, and some of the connections seemed a little iffy. Upon pulling the switch out of my steering column, it was in visually better shape, so I was worried that my replacement wasn't going to work but I went through with it. Turn signals both work, high beams and even flash-to-pass now work. Really relieved that I've finally done this after 3 years this month of owning this car and the issue getting steadily worse.
Some issues I came across during the replacement:
The countersunk 10MM screw holding the steering wheel on was a pain - if I had a friend it would've been easy to hold it still and turn the breaker bar, however I managed to get my foot on it and steady the wheel enough to break it loose. An impact probably would've done it too but I don't have air in my garage.
The two electrical connector retainers in the multifunction switch for the clockspring had me confused for quite a while until I realized I had to pry two tabs down instead of one to slide them through.
A lot of screws were missing in the lower instrument panel, it's apparent that it's been removed before. It was a pain getting the instrument panel back in place because gravity really didn't want to let it go while I was trying to start the screws in it, but after some wiggling I could hold my knee against the bolsters to hold it in place.
I was going to make a writeup on it because there's very little said on here about replacing the multifunction switch as far as time, cost, other potential parts needed, but I found a thorough writeup for the R170 SLK that was exactly the same for our non-SRT cars apart from us not having a screw in the driver side air nozzle vent, which you pry out around the edges with a plastic wedge tool instead. That write-up, with photos can be found here: Mercedes-Benz SLK 230 Turn Signal Stalk and Combination Switch Replacement | 1998-2004 | Pelican Parts DIY Maintenance Article
Multifunction switch Mercedes-Benz part #170 540 03 44
The junkyard unit had some corrosion on the aluminum casting, and some of the connections seemed a little iffy. Upon pulling the switch out of my steering column, it was in visually better shape, so I was worried that my replacement wasn't going to work but I went through with it. Turn signals both work, high beams and even flash-to-pass now work. Really relieved that I've finally done this after 3 years this month of owning this car and the issue getting steadily worse.
Some issues I came across during the replacement:
The countersunk 10MM screw holding the steering wheel on was a pain - if I had a friend it would've been easy to hold it still and turn the breaker bar, however I managed to get my foot on it and steady the wheel enough to break it loose. An impact probably would've done it too but I don't have air in my garage.
The two electrical connector retainers in the multifunction switch for the clockspring had me confused for quite a while until I realized I had to pry two tabs down instead of one to slide them through.
A lot of screws were missing in the lower instrument panel, it's apparent that it's been removed before. It was a pain getting the instrument panel back in place because gravity really didn't want to let it go while I was trying to start the screws in it, but after some wiggling I could hold my knee against the bolsters to hold it in place.
I was going to make a writeup on it because there's very little said on here about replacing the multifunction switch as far as time, cost, other potential parts needed, but I found a thorough writeup for the R170 SLK that was exactly the same for our non-SRT cars apart from us not having a screw in the driver side air nozzle vent, which you pry out around the edges with a plastic wedge tool instead. That write-up, with photos can be found here: Mercedes-Benz SLK 230 Turn Signal Stalk and Combination Switch Replacement | 1998-2004 | Pelican Parts DIY Maintenance Article
Multifunction switch Mercedes-Benz part #170 540 03 44
Joined: Dec 2019
Posts: 109
Likes: 23
From: Cincinnati
Re: Multi-function Switch/Headlight switch replacement?
Got the job done, only took me 4 or so hours with my ADD. Not bad - a brake job takes me longer, lol.
The junkyard unit had some corrosion on the aluminum casting, and some of the connections seemed a little iffy. Upon pulling the switch out of my steering column, it was in visually better shape, so I was worried that my replacement wasn't going to work but I went through with it. Turn signals both work, high beams and even flash-to-pass now work. Really relieved that I've finally done this after 3 years this month of owning this car and the issue getting steadily worse.
Some issues I came across during the replacement:
The countersunk 10MM screw holding the steering wheel on was a pain - if I had a friend it would've been easy to hold it still and turn the breaker bar, however I managed to get my foot on it and steady the wheel enough to break it loose. An impact probably would've done it too but I don't have air in my garage.
The two electrical connector retainers in the multifunction switch for the clockspring had me confused for quite a while until I realized I had to pry two tabs down instead of one to slide them through.
A lot of screws were missing in the lower instrument panel, it's apparent that it's been removed before. It was a pain getting the instrument panel back in place because gravity really didn't want to let it go while I was trying to start the screws in it, but after some wiggling I could hold my knee against the bolsters to hold it in place.
I was going to make a writeup on it because there's very little said on here about replacing the multifunction switch as far as time, cost, other potential parts needed, but I found a thorough writeup for the R170 SLK that was exactly the same for our non-SRT cars apart from us not having a screw in the driver side air nozzle vent, which you pry out around the edges with a plastic wedge tool instead. That write-up, with photos can be found here: Mercedes-Benz SLK 230 Turn Signal Stalk and Combination Switch Replacement | 1998-2004 | Pelican Parts DIY Maintenance Article
Multifunction switch Mercedes-Benz part #170 540 03 44
The junkyard unit had some corrosion on the aluminum casting, and some of the connections seemed a little iffy. Upon pulling the switch out of my steering column, it was in visually better shape, so I was worried that my replacement wasn't going to work but I went through with it. Turn signals both work, high beams and even flash-to-pass now work. Really relieved that I've finally done this after 3 years this month of owning this car and the issue getting steadily worse.
Some issues I came across during the replacement:
The countersunk 10MM screw holding the steering wheel on was a pain - if I had a friend it would've been easy to hold it still and turn the breaker bar, however I managed to get my foot on it and steady the wheel enough to break it loose. An impact probably would've done it too but I don't have air in my garage.
The two electrical connector retainers in the multifunction switch for the clockspring had me confused for quite a while until I realized I had to pry two tabs down instead of one to slide them through.
A lot of screws were missing in the lower instrument panel, it's apparent that it's been removed before. It was a pain getting the instrument panel back in place because gravity really didn't want to let it go while I was trying to start the screws in it, but after some wiggling I could hold my knee against the bolsters to hold it in place.
I was going to make a writeup on it because there's very little said on here about replacing the multifunction switch as far as time, cost, other potential parts needed, but I found a thorough writeup for the R170 SLK that was exactly the same for our non-SRT cars apart from us not having a screw in the driver side air nozzle vent, which you pry out around the edges with a plastic wedge tool instead. That write-up, with photos can be found here: Mercedes-Benz SLK 230 Turn Signal Stalk and Combination Switch Replacement | 1998-2004 | Pelican Parts DIY Maintenance Article
Multifunction switch Mercedes-Benz part #170 540 03 44
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