brake pad warning light wiring diagram
 

Hi All,


The brake pad warning light has been on for a while. Trikey has fitted a plug shorting the two wires together and put the light out, but I want to trace the broken wire and repair the wiring so I can re-instate the the plug and put the circuit back to 'factory'


So, does anyone have a wiring diagram of the two sensors up to the plug in the engine bay?


SteveN

It is the black plug, and simply unplug the shorting link, and plug in the new sensor, you don't need a wiring diagram.

The adjacent blue plug is for the ABS sensor ;)

Brian :D

Pad Wiring
 

A senor may have failed but here you go.

Thanks Guys,


Maybe I didn't explain clearly :shrug:
The shorting plug fitted by Trikey is in the engine bay.
The fault appears to be the wiring between the 2 sensors and the plug in the engine bay, not a faulty sensor.

I had the light come on for a while, then go off for a while, ....... Then came on and stayed on. Trikey fitted the plug to get the car through the MOT as having the warning light on is a failure regardless of how much meat is left on the pads.

So all the wires are the same colour, that makes life a little more fun when tracing the fault:duh:


SteveN

You're right Steve and I'd be very surprised if it wasn't in the front wheelarch (which you've removed). What happens is that the cable from the sensor pops out of the metal bracket on the suspension strut. When you then apply full steering lock the tyre makes contact with the cable, erodes the insulation and eventually severs the conductors inside and bingo, your brake pad warning light illuminates.

So begin your rectification work by buying a new sensor complete with cable and plug (aftermarket are cheaper) and fit it but use cable ties to ensure that it cannot be released from the retaining bracket. The odds are that this will solve your problem without any further work being necessary.

Simon

Thanks Simon,


You are a bit ahead of me here:
:D:D
SteveN

As in SD1too's post - the sensor wiring. The circuit is from the instrument panel, through the front sensor, through the rear sensor, and then to Earth. When the circuit is broken by the sensor wearing away, the Earth connection is broken and the warning light is switched on.
As shorting out the plug re-connects the circuit (in place of the break in the sensor cable) the Earth connection cancels the warning light.

That is the plan, but first I have to find the break:getmecoat:


SteveN

Take a look at the offside rear plug, it resides behind the back part of the arch liner.

If either is open circuit, the lamp lights, I have disabled both sensors on the entire fleet, it simply isn't required as I can see how much meat is left on the pads through the wheel.

Brian :D