C4 ABS & PSM - Geniscan reports nothing

[ainged]

Hi all,

I'm having a prob with my UK 2001 manual C4 which I hope someone can shed some light on. Whenever I set off as soon as I press the foot brake I get the ABS & PSM lights come on. Turning off the ignition & then restarting clears these, but when I touch the brake again - on they come.

I bought a Geniscan GS1000 to try and read the fault code but it comes back with "No Codes", so from reading on the forum I doubt its the MAF. Engine wise the car seems to be running fine.

what else could it be ? or have I just bought the wrong OBDII reader that can't read what the problem is ?

All help much appreciated

Cheers

Dave

[Loren]

A generic scanner will not read ABS or PSM fault codes they will only read DME (engine) fault codes.

This can sometimes be caused by either a bad MAF sensor or a bad brake light switch -- both should be checked.

[ainged]

i've read up on things to check regarding the MAF, but what is involved in checking the brake light switch ?

Cheers

Dave

[Loren]

Have someone check to see that your brake lights come on when step on the brake pedal and/or check the switch itself with an ohm meter.

[ainged]

It is the brake light switch :D i've ordered a replacement from Euro Car Parts, so should be here soon.

Thanks for your advice

cheers

D

[ainged]

Brake light switch has arrived.

Sorry to have to ask - how do I replace it ?

having a look around the drivers side well and brake lever hasn't helped

[Izzy]

Use the search function and type "brake light switch", you will get all the info, and pictures