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Old 20th June 2020, 17:48   #1
sln8458
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Default 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
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Old 20th June 2020, 18:52   #2
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Originally Posted by sln8458 View Post
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
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Old 20th June 2020, 18:55   #3
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Default Pad Wiring

A senor may have failed but here you go.
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File Type: pdf Pad Sensor wiring.pdf (453.9 KB, 30 views)
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Old 21st June 2020, 08:48   #4
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Thanks Guys,


Maybe I didn't explain clearly
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


SteveN
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Old 21st June 2020, 09:26   #5
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Originally Posted by sln8458 View Post
The fault appears to be the wiring between the 2 sensors and the plug in the engine bay ...
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.

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Old 21st June 2020, 09:55   #6
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Thanks Simon,


You are a bit ahead of me here:
Quote:
front wheelarch (which you've removed).

SteveN
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Old 21st June 2020, 10:33   #7
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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.
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Old 21st June 2020, 12:54   #8
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Find the wiring break and just join the ends back together again.---
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Old 22nd June 2020, 08:51   #9
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Find the wiring break and just join the ends back together again.---

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


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Old 22nd June 2020, 08:58   #10
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That is the plan, but first I have to find the break


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.

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