www.jec.org.uk

I am (very) slowly building a 1975 XJ12C that I purchased a number of years ago as a rolling chassis and a flat-bed full of bits - transpiring to be quite a challenge! Anyway, the boxes included the ABS system from a 1991 Series 3 where the issue I am having is that I don't know where the bits fit as there seem to be no wiring diagrams or pictures available anywhere. Hence, this post for your assistance.

The ABS Pump is easy because it mounts in place of the battery under the bonnet (battery to be relocated in boot). Equally, the ABS Sensors fit into the front and rear hubs and the wiring loom passes through the engine bulkhead at a specific obvious location. What I don't know are the following:

1. Where exactly the ABS ECU is mounted ... under the passenger seat somehow or under a foot-rest panel?
2. Where (and in which orientation) the (presume) G-Sensor or Motion Sensor is mounted ... absolutely no idea here, but important!
3. Wiring Diagram for the rest of the ABS Loom:
a. Inside the car, a wire in the loom must provide power to an ABS Light.
b. Under the bonnet, there are 2 wires that look like one connects to the +12V Power Stud (on the bulkhead) whilst the other might connect to the Starter Motor or Starter Motor Solenoid. Anybody able to confirm?

With this being my latest challenge, I would be pleased to hear from anybody (reasonably local) that might own one of these rare 1991 cars so that I can have a closer look, or anybody who can answer my questions posed above. Thanks in advance.

Regards
Wolfgang Souter
Westbury, Wiltshire, UK
1975 XJ12C with upgrades from a Series 3

I'm no expert myself although I did have a S3 V12 Sov at one time, but there is a lot of info at http://www.jagrepair.com/ including the ABS and wiring on later models.

Have a trawl through and see if it is of any use.

Thanks poprivet. I had a quick look through the information in your link where the 1991 Jaguar XJ info would seem to refer to the later XJ40 and not the Series 3. In particular, the Series 3 ABS Pump to ABS ECU Loom is only long enough to position the ABS ECU either around the passenger seat or in the passenger foot-well - certainly not long enough to reach the boot where the linked Jaguar-Repair information states the ECU is located. Thanks again, but link does not help me with this issue.
Regards, Wolfgang Souter