UKKid35

My Speedo has failed, this happened shortly after I fixed some dash illumination issues

I found the 4 pin connector in the wheel well, pins 3 & 4 for the reverse switch and pins 1 & 2 for the sensor



With the car on axle stands and the car running in forth at idle there is a variable resistance across pins 1 & 2 so I'm assuming this means the reed switch is working

I've also taken out the dash and soldered the speedo connections as mentioned by Dwayne's Odo documentation, and checked continuity to the edge connector




However, all to no avail

What should I check or try next?

Jaxley

I would check the continuity from the ribbon board edge all the way to the rivets you soldered. I had to add small pieces of wire to mine because the small "circuit board" the rivets attach to was not making connection. If remember right, the rivets should have connection straight across to the backs of the pins. They are in your last picture, near the top.

UKKid35

Thanks, I did check from the ribbon board edge to the rivets, however I haven't checked all the way to the connector in the wheel well, as I didn't have a long cable with croc clips to hand

Jaxley

@UKKid35 this is what I’m referring to.

Not sure on the yellow vs red line on that last rivet

Hey_Allen

If you look closely, the picture faintly shows the trace on the bottom of the flexible PCB going straight up to the pin following the red line.

The one next to it appears to connect above the row of pins, and the last one on the right goes down to the one with the question mark next to it.