As long as you have 12V on that wire no need to unpin it, that 12V is sent by the SLABS ECU to extinguish the LED cos it has positive feed one side from the IP and once positive is applied to it's other side it should go out, that's how all the warning lamps are working... IMO the problem is in the IP... i presume that the 12V drops there if you apply the handbrake?
I haven't tested for voltage drop but will do shortly however.
Yes, it's quite possible cos as long as you have 12V on the wire to the brake warning it should deffinitely be off, it's supposed to come on when it gets earth from the handbrake or reservoir's switch or if the 12V is cut by the SLABS ECU... then the IP's internal logic circuit brings the light on like on the self test... the warning lights are made to work this way as to come on if a system remains without power due to a blown fuse or the power is cut on the warning lamp's wire by the diagnostic protocol due to a fault if you see what i mean
Have now cut the wires from the trans temp sensor and the overheat lamp has gone out but the handbrake light remains.
Voltage drops to 10v on handbrake wire and also on reservoir wire.Have now cut the wires from the trans temp sensor and the overheat lamp has gone out but the handbrake light remains.
Will continue to see what I can find
Thanks again for your input, very valuable
It's a drop along the wiring not a problem, it should drop completely when the handbrake is on.... here's about the brake warning
Doesn't drop below 10v, it's always live handbrake on or off
Then there is another issue too there cos the handbrake switch should close to earth when it's applied
Will keep looking and testing.
Both the handbrake and reservoir switches work as they should returning the values they should.Will keep looking and testing.
Thanks again for all your time and input, very much appreciated
It's C0504 pin 9 , appears in the ABS system's diagram but as long as the warning stays on when it's +12V on that wire the problem is in the IP for sure
Thank you
Thank you, will study them later
You Sir, are right on the money. Plugged in another IP and all is well, handbrake light goes off when released.
Thanks for that.
And the next fault is now showingThanks for that.
Luckily the mileage was lower so have done a sync with BCU and all is normal again.
Until the next fault
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