Technical Brake lights on permanently!

[Delux]

In the position of the plug in the pic I’ve indicated the two pins with battery voltage.

Is there a relay somewhere for the brakes?

 

[koalar]

Great

That's as expected

ok, I've tested both brake switches and got the same result:
.0001 resting
1 plunger depressed

Are you sure, thats not how it's drawn, normal open at rest and closed when pressed

Do the other two pins work the opposite way

 

[Delux]

Ok will double check.

To confirm, on the brake light switch I'm testing - the clip is at the top or the ridge?

 

[koalar]

1 and 3
2 and 4


With and without the switch pressed

Wish I still had a panda to test my own for comparison

 

[Delux]

Not sure which up to test - see orientation of switch below. Which way up?

 

[Delux]

With blades horizontal:
2 and 4 read 00.9 and when plunger pushed in it's 1

1 and 3 are the reverse.

 

[koalar]

That's great

Matches

Fiats circuit diagrams are misleading

 

[Delux]

That brake light switch in your pic definitely has a longer plunger than the two I have. See pic of mine below.

Should the plunger be compressed at rest and extended when foot on the brake?

 

[koalar]

That brake light switch in your pic definitely has a longer plunger than the two I have. See pic of mine below.

Should the plunger be compressed at rest and extended when foot on the brake?

Mmm good spot, don't know what it means

This is OEM of part number 46840510

New

And one off a vehicle

And third party

 

[koalar]

Should the plunger be compressed at rest and extended when foot on the brake?

Yes

The plunger is on a ratchet and needs adjusting

Discussion Thread: Brake Light Switch Replacement | FIAT Stilo

Just collected my new switch from my local dealer: £11.39 inc vat!!!!! still- cheaper than being rear-ended!

www.fiatforum.com

 

[Delux]

Oooo that’s interesting! So the plunger can be pulled out with long nose pliers to extend it enough to be compressed at rest!

Grabs pliers…gently pulls out plunger…



Result! The plunger now is compressed when fitted and extends fully when brake pedal is pushed.

Lights are no longer on permanently anymore!

Thank you @koalar

 

[A3jeroen]

Normally you pull up the pedal. Pull out the pin on the sensor. Gently release the pedal. Ready.

gr J

 

[Delux]

Thanks @A3jeroen - It's RHD so there's a shaft across under the dash.

 

[A3jeroen]

Still. Adjusting the switch should work the same. Maybe a 2 persons job?

gr J

 

[Delux]

All done now and working well!