88 XJS ABS, how do I read codes?

I have an 88 model XJS with Bosch ABS and the ABS light is on. Can anyone please tell me how to extract codes from the system ? There is plenty of info on the TEVES system in the later cars on the internet, but I can’t find anything on the Bosch system.
Thanks, Evan from Oz

You better check with the appropriate list, Evan - it’s sort of outside our official ken…

xj6 85 Sov Europe (UK/NZ)

Moved to the correct forum