Hello,
I have just spent the weekend changing the rear bump stops and front shock absorbers on my 2000 Golf MKIV TDI GT. After much effort the job is done. One problem I have is that the ABS light is permanently on! I think that it started when I accidentally unplugged the front wheel sensors and brake pad wear sensor with the ignition on.
I have:
- Measured the resistance across each front wheel sensor terminal (1000 Ohms)
- Measured the DC voltage on the disconnected loom terminals which feed the wheel sensors (2.5V)
- Carefully cleaned the face of each sensor and the perforated disk
- Checked the condition of the wiring terminals and cleaned their contacts.
- Disconnected the negative terminal on the battery in an attempt to clear any memory.
- I drove up and down my drive slamming on the breaks to see if this would help.
No joy:( - Switching on the ignition without starting the engine still results in an ABS warning.
Unplugging either front wheel sensor causes the ESP warning light to illuminate. This is not too surprising as both the ABS and ESP systems use the wheel sensors. Interestingly, the passenger side results in an audible warning when the sensor is unplugged. The driver's side does not. Is this a clue? The fact that the computer seems to know that the wheel sensors are connected/disconnected (ESP light follows their connection status) makes me think that they are not broken.
My suspicion is that the ABS computer stores a fault condition, which needs to be reset. Has anyone had a similar experience? I am loathed to go to the dealer and pay for him to reset the computer or to read the fault code.
Thank you very much for your help,
Glen.