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

1999 MERCEDES BENZ C230
145,000 MILES • 4 CYL • 2WD • AUTOMATIC
Avatar
UP29BALNE1
  • MEMBER
  • 65 POSTS
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
Apr 2, 2018 at 2:59 PM
Advertisement
Avatar
STRAILER
  • CERTIFIED EXPERT
  • 53,854 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
Apr 4, 2018 at 10:58 AM
Avatar
UP29BALNE1
  • MEMBER
  • 65 POSTS
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
Apr 6, 2018 at 12:14 PM
Advertisement
Avatar
STRAILER
  • CERTIFIED EXPERT
  • 53,854 POSTS
Is the headlight switch on when the doors are closed?
Apr 7, 2018 at 11:55 AM
Avatar
UP29BALNE1
  • MEMBER
  • 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.
Apr 14, 2018 at 10:13 AM
Avatar
STRAILER
  • CERTIFIED EXPERT
  • 53,854 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
Apr 14, 2018 at 10:20 AM
Avatar
UP29BALNE1
  • MEMBER
  • 65 POSTS
It doesn't have the xenon lights, so would it still be the same thing
Apr 14, 2018 at 11:33 AM
Avatar
STRAILER
  • CERTIFIED EXPERT
  • 53,854 POSTS
It should be can you look to see if you have the lighting module in the location?
Apr 16, 2018 at 8:53 AM
Avatar
UP29BALNE1
  • MEMBER
  • 65 POSTS
No, there is no module that I can tell.
Dec 19, 2018 at 10:32 PM
Avatar
STRAILER
  • CERTIFIED EXPERT
  • 53,854 POSTS
Here is a picture of the module below. Try replacing it to see what happens.
Dec 20, 2018 at 9:39 AM