Speedo not working, but no ABS light!

[Savestones]

Time for another update:
Replaced the ABS sensor on the front right, speedo is still not working. Interestingly, it jumps back to life when giving a bang on the dash while going in a straight line.

With the build in test of the dials everything works perfectly, but I now thing it is probably some connection to the speedometer. A second option is that the previous owner messed some wiring up installing a new radio (with gps), as there are a while bunch of cut up wires hiding behind the radio.
Now I'm wondering if someone has some picture/a wiring diagram of the wiring between the ABS sensor and the speedometer. Then I know what to expect when taking out the dialbox.

[SD1too]

Originally Posted by Savestones

... speedo is still not working. Interestingly, it jumps back to life when giving a bang on the dash while going in a straight line.

It does sound like a poor connection to the IPK doesn't it Nathan.

Looking at the wiring diagram, the ABS sensors are wired directly to the ABS modulator. From there a single slate (grey) wire runs to the instrument pack (and the diagnostic socket). This is the DS2 data bus. There are no intermediate connectors to give trouble between the ABS modulator and IPK.

Due to the successful banging on the dash, you might like to withdraw the IPK and re-seat the 12 pin connector on the left-hand side as you view the rear of the unit.

Simon

[Savestones]

Originally Posted by SD1too

It does sound like a poor connection to the IPK doesn't it Nathan.

Looking at the wiring diagram, the ABS sensors are wired directly to the ABS modulator. From there a single slate (grey) wire runs to the instrument pack (and the diagnostic socket). This is the DS2 data bus. There are no intermediate connectors to give trouble between the ABS modulator and IPK.

Due to the successful banging on the dash, you might like to withdraw the IPK and re-seat the 12 pin connector on the left-hand side as you view the rear of the unit.

Simon

Single grey wire you say? I think I found my problem, which has been caused by some creative wiring by the previous owner! Pulled the IPK, and noticed a green wire spliced into the grey wire, wrapped up in a bunch of isolating tape. The other end of the wire was not connected to anything (at this moment), but was completely exposed. I guess this was shorting over all the exposed metal back there, only giving me the speedometer those brief moments bumps and turns caused it to hang loose. Drove around for a bit with the exposed end wrapped in some tape and the speedo is working fine again.






In hindsight my issues started about 2 kms after I'd changed the radio. I think in the process of changing this, I accidentally janked this (non original) wire from some harness/connector, leaving it to hang around!


Wheel bearings had to be changed anyway, bit of a pity about the working ABS sensor I changed, but I still believe this was the correct order of doing things.


Thanks everyone for their help!

[Mike Noc]

Well done for sorting that - Can be a right pain sometimes having to get to the bottom of non standard faults added by a previous owner!

[SD1too]

Yes, I second Mike's congratulations (above).

Nathan, don't worry about the ABS sensor. You did approach this unusual problem in the right way. Sometimes a sacrifice has to be made in order to reach the truth and the important thing is that your persistence paid off!

Simon