Brake light always on jaguar s type 3l year 2000
 

Hi
Brake lights stay on, check switch, it’s in position and checked with circuit tester and it’s working, also the red park light is lit on dash even though hand brake not on, and the DSC light is on,

Any ideas

Thanks in advance

Adey

You posted on wrong forum thread; this one is for X Types.

Adey200, from what you are describing, this pretty much only leaves one thing that it can be. To give you a little detail about how the brake lights work, you have the switch under the dash that sends a 12VDC or no voltage signal to the rear electronics control module (RECM). This tells the RECM whether to turn the stop lights on or off. The RECM then applies power to 3 different lines (high center brake light, left side brake light, and right side brake light).

If you look at the switch underneath the dash, you should see 2 wires going to the switch, an orange wire with a green stripe and an orange wire with a blue stripe. The orange/green wire is your 12 VDC supply. So, you need to look at the orange/blue wire to see if toggles between 12 VDC and 0 VDC as you depress the brake pedal. If this wire does this, then this pretty much confirms that you have a bad RECM. If you don't see a changing voltage, then your brake switch is toast.

With all this being said, it could be the wiring between the switch and the RECM. You can rule this out by simply repeating the voltage check at the RECM by going to Pin 13 (orange wire with no color stripe) and seeing if it changes voltage with depressing the brake pedal. If no change, then you have a bad wire between the switch and module. if it changes voltage, then this only confirms that the issue is the module. Please keep in mind that you do have a few plugs that the orange wire goes through and if you have recently done some work in the door sill area, these plugs may have come undone.