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Topic: Driver Side Parking Lights staying on Reply to Thread
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  Topic Review (Newest First)
05-29-2019 03:56 PM
Hutcho85 Dom, Take it to an Auto Sparky, they'll find it and fix it for maybe $100.00. It is certainly NOT a $600.00 repair.
05-29-2019 03:49 PM
domwild Thanks for help. As there is no after-market light switch available, I have to buy a Merc one from Hawaii and the cost + postage is AUS$600 or US$360, and that is mucho dinero. If the flaw perists, I will have to fork that out obviously as draining a battery is also not wise, that reduces the life.

One hopes that a faulty light switch is the problem as paying for a Merc technician to find rubbing wires somewhere must be very costly at AUS$270/hr. Due to the lack of rain here in Western Australia, rain having entered the front driver side SAM does not seem to the issue as told by a Merc mechanic.
05-28-2019 06:01 PM
Hutcho85 Most often the cause is an exposed wire on that circuit touching the body of the car. Find that and insulating will generally fix the issue.
05-13-2019 07:50 PM
KevinH2000

There is a torx fastener hidden under the parking brake handle.
05-13-2019 07:19 PM
rudeney Maybe this will help:

http://benzbits.com/w203/HeadlightSwitch.pdf
05-13-2019 02:52 PM
domwild Thanks Kevin. It looks like I need not ask for your help again as Dr Google has come up with two suggestions how to remove the switch. One video removes the panel on the side, the other just seems to use repeated twisting and turning to pull the switch out.
05-12-2019 08:10 AM
KevinH2000 My lights would turn on at random times with the switch in the off position. This would drain the battery and trigger an airbag warning due to low voltage. I looked at several potential sources for the problem. One of my diagnostic techniques included disconnecting the headlight switch every time I parked for more than a few minutes. Since the problem didn't happen with the light switch disconnected, I was fairly confident that the problem was due to a defective light switch. I replaced the light switch assembly in November, and I haven't had the problem since I replaced the switch.

Because the price of the switch at the dealer was about the same as an on-line seller after factoring in shipping, I bought the replacement part at the dealer. The parts specialist told me it was a common problem with the W203, and a service representative within earshot confirmed that guidance. I haven't been able to find that information on any of the forums, so you will need to reach your own conclusion.

If I had it to do over again, I would clean the switch with electrical contact cleaner before replacing the switch.

Good luck
05-10-2019 11:23 PM
domwild
Driver Side Parking Lights staying on

Whilst this is a desirable feature to allow you to turn the parking lights on for one side only, especially for Europe with its narrow roads, that seems to be a flaw with many Mercs and not just mine and it is not always the driver having switched them on by mistake:

I drive into the dark garage during the day, the "courtesy lights" come on and they look like standard driving lights, those driving lights go off after a few minutes BUT while the light switch is on zero AND if I am unlucky the RH parking lights come on later on to empty the battery, nasty! Suggestions here seems to be the faulty light switch or driver side fuse/relay box (SAM), both a dear solution.

From memory, it has been suggested rain may have entered the SAM?? Any idea what in the SAM does that evil thing so I can fix it? Or if it is easy to change the light switch?
01-30-2009 12:03 AM
FrankW
Quote:
Originally Posted by Black04C230 View Post
Hmm... Interesting, I was wondering what the actual use of this feature was.
parking on streets that are not lit.
01-29-2009 08:36 PM
Black04C230 Hmm... Interesting, I was wondering what the actual use of this feature was.
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