Cannot Central lock and set the alarm using the remote-control key?

Tiny
IVAN MCDOUGALL
  • MEMBER
  • 2002 MERCEDES BENZ 500SL
  • 5.0L
  • V8
  • 2WD
  • AUTOMATIC
  • 32,000 MILES
I can't Central Lock and set the Alarm using the remote control key. I have charged the batteries (Engine and Consumer) and replaced the remote key batteries also, but nothing happens when I press the remote any of the 3 buttons. The remote light (red) does come on, on the remote.
Monday, March 10th, 2025 AT 2:41 AM

4 Replies

Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 54,137 POSTS
The remote is bad if the red light does not come on which is common. Here is a replacement which you can reprogram for $29.00 from amazon:

https://amzn.to/3FfrYVI

The instructions are included with the new fobs. Please let us know what happens.
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Monday, March 10th, 2025 AT 1:00 PM
Tiny
IVAN MCDOUGALL
  • MEMBER
  • 3 POSTS
Hi Ken L, I did say the red light comes on as a process of elimination but I'm delighted to know I can get a replacement from you.
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Monday, March 10th, 2025 AT 10:10 PM
Tiny
IVAN MCDOUGALL
  • MEMBER
  • 3 POSTS
Sorry, I should have added to the last post that I am still without a solution.
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Monday, March 10th, 2025 AT 10:22 PM
Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 54,137 POSTS
Opps, sorry read it too fast. I would check the fuses #16, # 5 and #6 in the trunk for the security system and if they are okay let's do a CAN scan, this video will help:

https://youtu.be/u-4syLc-ifQ

Here are the wiring diagrams for the system. Here are the fuse locations. Check out the images (below). Please let us know what happens.
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Tuesday, March 11th, 2025 AT 12:38 PM

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