Wednesday, June 11, 2014

Keyless entry replacement on the W124

My wireless entry failed recently due to the siren wiring short circuiting and thus I am no longer able to use my remote to unlock or lock the doors.

Not too much of a problem as I'd always wanted to replace the system as the range of the old one was quite limited.

I had bought a keyless entry system from Aliexpress since 2 years ago and had no good reason to install it until a week ago when it rained so heavily that it shorted my siren +12V wire to ground and rendered the old keyless entry system useless.

This was the system that was purchased and the instruction manual looks like this.

Honestly, even for an electrical engineer, the instructions were quite useless...

Then I found help,at Peachparts forums, where many classic Mercedes owners, contribute technically to helping other owners, in this thread.

Monday, June 2, 2014

Flickering headlamp aka dash bulb warning light

If your W124 is experiencing a dash bulb warning light that comes on and off, it may be a hint that your headlamp connectors is not as tight as it should be anymore.

If the cause is not an actual faulty bulb, it is likely a loose connector.

This connector is one of the causes of a flickering bulb warning on your dashboard.

W124 Euro Headlamp Connector
It is the connector that connects to the headlamp.

After 20 or more years, the connectors might be slightly deformed and may not latch as well onto the male pins. A simple solution will be to add a layer of material on the non-conducting pin as shown below. This will introduce some friction and tightness onto the way the plug connects and will also increase the contact of the conducting pins. The material used was a 5mm diameter heat shrink.

DIY increase contact and better latch for headlamp connector

If this had solved your issues with the dash warning indicator, do share with other W124 owners!