Hi all,

I was hoping some knowledgeable souls might be able to assist me with the following issue:

Car is a '04 Coupe, Automatic with 80,000 miles.

My issue is that the hazard lights aren't working at all. When I press the hazard button there's no sound, no flashing, nothing. The indicators (flashers) are working fine and all the relevant lights flash when I lock / unlock the car.

I suspect it might be a relay issue but I honestly have no clue about it. All of the information I can find relates to the hazards working but the flashers not working so I'm a little stumped. I left it in to a garage to get the trunk fixed up as I had the stuck trunk issue but the mechanic doesn't want to go digging around behind the centre console and hazard control module apparently due to the location of an airbag / airbag sensor (?).

Has anybody experienced this issue before, or would any of you be able to offer any insight as to what the issue might be?

I should also mention that I have a '97 SLK 230 that I can cannibalise for hazard module parts if they'd fit, so if that's an option I'll gladly go for it.

Would hugely appreciate any responses, thanks guys!

 

I'm not 100% sure but I think the relay is built into the hazard flasher switch assembly so you would have to replace the switch.

 

Is fuse 35 (underhood accessory block) blown?

Other than that, I got nothing. The emergency flasher circuit(s) as depicted in the 05 manual are a TOTAL MESS in my eyes.
It is POSSIBLE that the flasher switch is bad, other than that, I got nothing.

 

From the 2004 Crossfire Service Manual.

HAZARD FLASHER
DESCRIPTION
The hazard flasher (1) is integrated within the hazard switch
assembly (2) and cannot be adjusted or repaired. If faulty,
worn, or damaged, the entire hazard switch assembly must be
replaced. For complete hazard switch removal procedures, see
hazard switch removal in this section. Refer to Page 8L-100

If fuse 35 was blown other things would not work either.

http://www.ebay.com/itm/04-05-06-07-Chrysler-Crossfire-HAZARD-LIGHT-Switch-OEM-/200983064191?pt=Motors_Car_Truck_Parts_Accessories&hash=item2ecb862e7f&vxp=mtrThis part looks to be Crossfire specific as it has a 193 820 04 10 part number.

 

See, that is the thing I have with the service manual- 3800 + pages and so much is left out. There is no indication of what is in the switch assembly itself.

This is repeated thruout the service manual. This is NOT how service manuals are produced in MY industry...

 

Your industry has to deal with idiots maybe. Just joking.

The manual says it is integrated into the switch, pretty plain and simple to me in this case. But there is a lot not said elsewhere, but we are smart we can figure it out.

 

Wow, thanks for the flood of responses guys!

The car is in the garage currently so I presume the mechanic took a look at the fuses (I printed out the relevant sections of the manual for them: fuses, relays etc.), but I'll pick it up shortly and take a look at fuse 35.

@ onehundred80:

I believe the part is unique to the Crossfire but only because of the different icons and colour of the Crossfire button.

I think the only reason for the different part numbers is that the SLK buttons have "ASR OFF" written on them (and are black) rather than the 'skidding car' icon (and silver colour) for the traction control.

Judging from the pictures of the Crossfire hazard switch that you linked (thanks for that!) and the SLK hazard switches linked below it looks like it should be a straight swap, the only difference being the colour and icons of the ASR and lock buttons.

http://www.ebay.com/itm/98-03-Mercedes-Benz-R170-SLK230-SLK320-ASR-lock-hazard-switch-panel-/321232774010?pt=Motors_Car_Truck_Parts_Accessories&hash=item4acaf7237a&vxp=mtr
http://www.ebay.com/itm/2002-Mercedes-Benz-W170-SLK32-SLK-SLK320-AMG-Hazard-Switch-1708202410-OEM-/121259495328?pt=Motors_Car_Truck_Parts_Accessories&hash=item1c3ba10fa0&vxp=mtr
Mercedes part number is 170 820 17 10 which is quite similar to the Crossfire part number 193 820 04 10, though I'm not sure what minor differences there might be between the two. I reckon it's just the colour etc. but again, not 100% sure.

The Crossfire and SLK switches seem to have the same connectors, placement and dimensions. Do you guys think along the same lines, that it looks like they'd be swappable?

I could live with two different coloured buttons for the time being. I think I'll try switching them out myself over the weekend and see if that bears any fruit but I'd like to get your opinions on it before taking my centre console apart!

 

The first number 170, or 193 is the car model.
The second number means it's an electrical part and that is the only similarity.
We like things all the same so it would have to be silver for us. LOL
It would probably work fine.

 

Aha! Well, I'm certainly showing my ineptitude when it comes to part numbers!
Appreciate the response though, I'll give it a go over the weekend before pulling my hair out when I find out it doesn't fit!

 

It's probably the same basic part, different symbols and color. The numbering system is a bit wacky to me,probably easy when you get to know it though.

 

Here's the dealer's part# 5102614AA . It's around $70.00 for a new one.

 

Great, thanks robby363!

 

$51 here............

 

And thanks again, onehundred80!

 

Just a small update on this for anyone who might be having similar issues in future:

Fuse 35 is fine. The other things controlled by that fuse (instrument lights etc.) were all fine. I replaced the fuse just in case (because hell, why not!) but no joy.

I took the hazard switch out of the SLK and it's identical in form-factor to the Crossfire hazard switch. I haven't taken the Crossfire hazard switch out yet as it's a job for the daylight hours but the only difference with the two switches is going to be the fascias for the lock and ASR (traction control) buttons. On the SLK switch I have here those fascias are held on by two 'indent' type tabs so they're very easily popped off.

Assuming that the Crossfire button fascias are the exact same, which is almost certainly the case, then I can just swap the fascias from the Crossfire hazard switch over to this one and I won't need to buy another switch at all.

Fingers crossed that fitting the replacement switch will resolve the issue!

 

Update:

I didn't have any DIN tools to take the radio out yesterday so I tried making some out of old credit cards using pictures of the actual tool. That didn't work, so I tried some lengths of steel. That didn't work either, and I'd spent about an hour and half trying various things / making various things with no joy so I packed it in for the night.

Went to a local Mercedes mechanic today and he popped the radio out in 3 seconds with the correct DIN tools. Top tip: Get some DIN tools! :P

Once the radio came out I was able to undo the necessary screws (just inside the radio socket, directly in line with the centre air vents) and pull the bezel off granting me access to the hazard switch. The SLK switch is the exact same dimensions so it fit in without issue and that solved the problem.

I transferred the button fascias over but there is a minor aesthetic problem:

The white seat behind the fascia (the part inside the button that's used to actually hit the relevant switch, which the fascia clips over) is slightly different on both buttons. The Crossfire fascias won't fit on to the SLK seats so you have to take the Crossfire seats with the fascia attached and clip them onto the SLK button.

They snap in just fine but they're slightly thinner so when installed the buttons are slightly angled downwards. This also means that when you want to turn the traction control off / use the central locking button you have to push a little harder than normal but it'll do 'til I buy a new Crossfire switch.

The issue with the old Crossfire switch seems to be a spring issue in that the hazard button wasn't popping out when pressed (to turn it on). I prised the button out and it made a small *pop* noise and now it won't stay down when pressed meaning that the hazards would be stuck on if re-installed.

Not sure if I'm bothered taking it apart to find out exactly what the issue is with that - I think it's likely that a piece of plastic has worn down / snapped off so a new hazard switch would be required in any event.

Thanks to everyone for their input and help in getting this sorted!