High and low beams are not work as well as rear taillight and turn signal drivers side

Tiny
UP29BALNE1
  • MEMBER
  • 1999 MERCEDES BENZ C230
  • 4 CYL
  • 2WD
  • AUTOMATIC
  • 145,000 MILES
Neither the hi beam nor the low beam on the driver's side turns on when you turn the lights on. I checked the bulbs and they appear to be okay. Then I checked the fuse under the hood and it was not blown. Can you tell me where I can find the relay for this? Also, today someone told me I had no rear taillight or turn signal on the driver's side. Can you point me in the right direction? Thank you for your help
Monday, April 2nd, 2018 AT 2:59 PM

9 Replies

Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 54,601 POSTS
Hello,

It sounds like you have a head light switch that is out. Here is a guide to help test to see where you are loosing power.

https://www.2carpros.com/articles/how-to-use-a-test-light-circuit-tester

Here are the headlight wiring diagrams to help you see how the system works no relay but a number of fuses. Also check for power back at the tail light bulbs to see whats going on there as well.

Check out the diagrams (Below)

Let us know what happens and please upload pictures or videos of the problem.

Cheers, Ken
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Wednesday, April 4th, 2018 AT 10:58 AM
Tiny
UP29BALNE1
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After some testing I happened to notice that both headlights would come on after the car was shut off and you closed the door. I would turn off the headlights and when I closed the door the delay will kick the lights on and during that period everything works fine. So I'm assuming you were correct and it is the headlight switch. Thank you
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Friday, April 6th, 2018 AT 12:14 PM
Tiny
KEN L
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Is the headlight switch on when the doors are closed?
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Saturday, April 7th, 2018 AT 11:55 AM
Tiny
UP29BALNE1
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  • 65 POSTS
Okay with the car running doors closed only passenger headlight on.
Engine off, key off, switch on, door closed only passenger headlight on.
Engine off, key out, door closed, light switch on after key but off before opening door both headlights come on.
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Saturday, April 14th, 2018 AT 10:13 AM
Tiny
KEN L
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  • 54,601 POSTS
If you have checked over all the wiring and its okay It sounds like you have an exterior lighting module that is giving you trouble I would try swapping it out. Here is the location.

Check out the diagrams (Below)

Please let us know what happens.

Cheers, Ken
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Saturday, April 14th, 2018 AT 10:20 AM
Tiny
UP29BALNE1
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It doesn't have the xenon lights, so would it still be the same thing
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Saturday, April 14th, 2018 AT 11:33 AM
Tiny
KEN L
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It should be can you look to see if you have the lighting module in the location?
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Monday, April 16th, 2018 AT 8:53 AM
Tiny
UP29BALNE1
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No, there is no module that I can tell.
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Wednesday, December 19th, 2018 AT 10:32 PM
Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
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Here is a picture of the module below. Try replacing it to see what happens.
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Thursday, December 20th, 2018 AT 9:39 AM

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