Just replaced the ABS Block in my 1994 XJS and now the ABS Light stays ON. The ABS Block was replaced to resolve a pull-to-the-right under hard breaking, which it did. The car brakes straight, good pedal, everything works well but the light stays ON. Any thoughts out there?

 

Hi XJS Rookie

Job number1. Check the Fuse.

It could be Blown or Dirty and though unlikely may have fallen out.

On my 1989 its under the Knee Pad on the Passenger Side.



Knee Pad on the Passenger Side of my 1989 underneath which are the Fuses for the Brakes




These are the Brake Fuses
One is for the Brake Pump while the other is for the ABS (So don't go and pull the wrong one!)

But much more likely is that you could have a Bleeding problem, if your Master Cylinder looks like this?



Does your Master Cylinder look like this?

Are you absolutely sure that you bled the Brakes properly, especially the rear ones, as there are two different Braking Systems that both work in

unison with each other.

Where the Front ones are Bled in the Normal way by pumping the Brake Pedal, while the Rear ones rely on the Electric Brake Pump, that have to be

Bled on the Key with the Ignition ON (But don't Start the Car)

Though if this is not done Correctly, then it is perfectly possible, that only your Front Brakes are Working while the rear ones are not, which could be

the reason that the ABS Light is still on.

This is a sort of a Jaguar Safety feature, so if your Brake Pump goes on the Blink then you 'May' be able to limp home just using the Front Brakes.

So next time you turn the Key on, listen to the Brake Pump and in the event it doesn't Stop after 30 Seconds Turn it off.

Or you could burn out the Brake Pump, which is very expensive to replace.

And so my educated guess, would be that you may need to bleed all your Brakes again.

 

so of the two fuses which is which, I cant see a number on them although 8, 9 are shown on the plate. I want to check the ABS

 

Ive checked the fuses and both OK. Ive clamped the battery connections for 3mins to drain the alarms/ecu. Ive pressed the brake pedal 12 times with ignition off. None of these stopped the ABS light coming on on the dash board, so I am going to do the "blink test". However I am still very puzzled as to why with the "new" Teves unit fitted, the ABS light now comes on yet the brakes are wonderful, whereas before the light was off yet the car pulled violently to the right. My garage MOT tester says it must be a wheel sensor but that doesnt make sense.

 

maccasa,

The light is being triggered by the ABS ecu based on a fault condition being signalled to the ecu. I'm, sure that when you've done teh Blink Test you'll have a better awareness of the problem.

Good luck

Paul