Don't forget that the rear sensor is the speedo sensor, the wiring splits at the A-post with under bonnet ABS units such as yours. ABS works on front wheels independently and rear wheels together all at same time. Your ABS CU is on driver's side on mounting tray under dash near steering column mounted with the ABS relay which has a fuse attached to it's case. If you access the VOC forums on their website you can pose your question there and get an answer. It is possible that the fuse may have blown due to water ingress.
Cheers, Peter.
: > I have a 760 Volvo GLE. 1989 / 90 Right Hand Drive England. : > The problem is I cannot find the On Board Computer for the ABS Brakes. Bosch : > 2E. : > You see the ABS light will not come on until I Move forward, It should come : > on when Ignition is turned for 10 Secs then go out. But after moving forward : > say 5 Yards it comes on and stays on. : > I have changed the 2 Wheel sensors as only ABS on the front. But the problem : > is still with me. I have had into a Volvo dealer and he cannot find it : > either, : > Unless it is hidden. Tried Under Glove compartment, Under Driver and the : > boot. No such luck! : > Can anyone place me to sight that deals in Old Volvo's 760 GLE Electrical : > lay out. : > Many thanks for taking the time to read this. : > Yours in hope Phil. City of Preston, England. : : If I remember correctly the ABS control unit is under the dash on the : driver's side (LHD of course) on a bracket with 2 relays clipped to it. : Can't your dealer read the trouble codes? : : -- : Mike F. : Thornhill (near Toronto), Ont. : : Change cant to ca and remove parentheses to email me directly.