JasonW202
New Member
I have a 1997 W202 that turns over but will not start. I noticed that the rear view mirror LED stays solid red after unlocking with the remote. Could this be why it will not start?
W202 Rear View LED Stays Red
- Thread starter JasonW202
- Start date
Stratman
MB Enthusiast
It's possible. From what I remember when I had a '97 202, the key and car can get out of sync with their security handshaking. When that happens the car doesn't see the correct key code and will not start. The process for synchronisation is detailed in the owner's handbook. If you don't have one I have no doubt the interweb will be the fount of all knowledge.
RogerSausage
Active Member
Re-sync process...
W202 C-Class
93-96 See note 2.
97 See note 1.
Note 1: Aim transmitter at a receiver and briefly press the transmit button twice. Within 30 seconds, insert new key in steering lock and turn to position 2.
Note 2: Aim transmitter at inside rear view mirror receiver and briefly press transmit button twice. Within 30 seconds, insert key in the steering lock and turn to position 2.
W202 C-Class
93-96 See note 2.
97 See note 1.
Note 1: Aim transmitter at a receiver and briefly press the transmit button twice. Within 30 seconds, insert new key in steering lock and turn to position 2.
Note 2: Aim transmitter at inside rear view mirror receiver and briefly press transmit button twice. Within 30 seconds, insert key in the steering lock and turn to position 2.
OP
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JasonW202
New Member
If I manage to sync it will the LED go from 'red' to 'green' to show it was successful do you know?
Much appreciated you getting back to me btw
Much appreciated you getting back to me btw
RogerSausage
Active Member
It should flash green when unlocking if all is well yes.
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JasonW202
New Member
It flashes green like you've said above and now the remote central locking works fine but alas the red LED on the rear view mirror remains constantly on.
Should it remain constantly on?
It turns over no problem but it won't fire up, all the while the red LED stays on.
Should it not go out or perhaps should be green for go to fire up?
Should it remain constantly on?
It turns over no problem but it won't fire up, all the while the red LED stays on.
Should it not go out or perhaps should be green for go to fire up?
RogerSausage
Active Member
Very strange. No, the red light shouldn't stay on.
In normal operation, the red light will flash when locking and then go out. The green will flash and go out when unlocking, and they will flash alternately for a short while if the key fob battery is low. I've never known one to have the red light just constantly on
.
Definitely sounds like the cause for your won't start, but it's not a normal fault.
In normal operation, the red light will flash when locking and then go out. The green will flash and go out when unlocking, and they will flash alternately for a short while if the key fob battery is low. I've never known one to have the red light just constantly on
.Definitely sounds like the cause for your won't start, but it's not a normal fault.
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- E63s s213 2019, E55 2004 Silver-SOLD, E63 w212 Weistec AMG-SOLD, E55 2004-SOLD, C36 1997-SOLD
there is a Diode in the rear view mirror, I recall this happened to my old C36 and my local indie opened the rear view mirror and replaced the diode. its all linked to the immobiliser
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JasonW202
New Member
I replaced the fuel pump and filter thinking it might be that. i couldn't hear the pump making any noise on ignition position 2. (like my motorcycle does) Replacing the fuel pump cured the start up problem and now it runs. Hurrah. However, the red LED is stil staying on, bizarre, thanks for your help Alps and RogerSausage and I'll look into the diode in the mirror at some point but just chuffed it now goes
