Headlight on warning chime mod.

Just for a lark, I thought I’d try and repurpose the seatbelt/key in ignition warning chime to make it work as “lights left on’ chime.

Funny thing is my van does not have a complete seat belt warning/key left in ignition circuit:

-it does not have a switch on drivers side seat belt latch for seat belt warning light

-warning light unit only has handbrake light and logo, seat belt space blank

-warning light unit does not have wire into connector for seat belt switch (yellow/red)

-door/seat belt warning relay missing

-relay socket  on top of fuse panel), has some wires to it, but not all. Missing black wire from fuse S18. only one grey wire from door switch the missing grey is for seat belt switch. Missing grey/red wire that is also part of seat belt switch.

So I thought I would use that incomplete socket to make a “lights left on chime” circuit. Turn out it is easier just to take another socket and slip it onto the relay panel, less fussing with pulling wires out of the relay socket, which is a bit of a pain.

Anyway, this is what I did… I had a 99 chiming relay, the “do-do-do, do-do-do” annoying tune, a spare socket, and a short length of 14 gauge wire with female spade connectors at each end.  I pulled the single grey wire from the incomplete seatbelt/key in ign socket (those of you with two wires there, you will have to cut the right wire, the one that leads to door switch, and put on a new female spade on) and this will connect to 86 on the chiming relay. See how the relay fits in the socket so you can get the spade connection into the right hole so it will connect with 86.

This is the switched ground, grey wire will connect to ground when door open,  drivers door only.

Now we need power to the 85 terminal of relay. But we only want power when lights are on, right?

I choose terminal G9 on back of relay panel. Its on the right hand side as you look at the panel, a group of 10 spade terminals. G9 gets power when license plate lights get power, so it will supply power to chiming relay when light switch is on.

So that’s pretty well it, get the female spades of both the grey door switch wire and the new wire to G9 in the relay socket so that the grey wire goes to 86, and the newly installed wire goes to 85.

When installed, the obnoxious chime will sing out whenever driver’s door is opened and the lights are on.

Pics below illustrate somewhat, see the incomplete wiring to the seat belt warning relay socket? Only a grey, a grey/black, and the double brown ground are installed.

Edit 29/05/2010: had pics of wrong relay. Of course its not a “99” relay, the “99” relay is the programmable intermittent wiper relay. Proper relay pics inserted.

  1. #1 by Mark on May 29, 2010 - 10:55 am

    The 99 relay shown is a wiper relay, not a chiming relay.

  2. #2 by albell on May 29, 2010 - 12:06 pm

    doh, of course… fixed now

  3. #3 by Old Fussbudget on August 19, 2010 - 1:38 pm

    This is a great hack — but for me it doesn’t work well because the attack isn’t abrupt enough. By the time the little tune gets from ears to brain I’ve already locked the door and am moving smartly away. For me the little 300-Hz Radio Shack buzzer works much better, even though it’s not so elegant. But that’s just me. I can hear Alistair gagging in the corner…

    • #4 by albell on August 19, 2010 - 2:03 pm


      you must leap out of the van like a shot! Maybe you really need an electric shock circuit in door handle 🙂

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