Rob W

sorry, i have been away for a while. i have put everything back together now. i'm confident that the wiring to the ABS ECU is fine now. annoyingly, after it was all put back together last week, i was able to drive it for some time at speeds upto 60mph without the light coming on. it was only when i stopped that the light came back on. i am know getting feed back through the pedal and can hear the pump working. same fault is back. frustrating!!! i have already sent my ABS Pump to be checked and it was returned saying that all the valves are working correctly. as the fault is intermittent, i feel that the fault still lies within the pump. i'm aiming towards the PCB drying up. I'm taking it of on Wednesday to have a look, hopefully remove any oxidation deposits, then i am giving it another full bleed. i know it will pass an MOT with this intermittent fault, but its so annoying when you can't find the fault to repair it.

do you have a UK electrical diagram, i could probably use that right now. my issue is the light coming on intermittently. the sensors are all good. the hyd unit is good. looking at the wiring going into the ABS control unit, it looks like some one has soldered some wires together. so i'm a little concerned that their is a fault in the wiring somewhere, i just don't know where right now.

I am currently chasing electrical faults around the car, but looking at the electrical diagrams i have (Bentley and Mitchell Repair), they both seem to be the same, but the reality of the wiring going into the unit is somewhat different. i am concerned that a previous owner replaced the Control Unit, which differs from the original, and has tried to re-wire it to work (but failed). the serial number at the bottom is 1H0 907 379 E (10.0941-0321.4 3X1559). i have attached the wiring going into the unit and how it differs from the circuit diagrams i have. i feel that i need to start to chase wires to ensure that it is the same as the 2x diagrams i have. if any of you are able to assist or offer any thoughts or experiences with similar issues, i'm all ears. i only need to get this sorted, then MOT here i come. many thanks in advance.

Well, i think I'm getting somewhere. just been able to get back to working on the Rado as i've been away with work for a while. i sent the ABS Pump off to the company used on 'wheeler Dealers', unfortunately/fortunately, they informed me that the pump was all ok. Now i have it all fitted, and bleed the system and i still had feed back coming through the brake pedal whilst driving and the light came back on. it was then i realised that there is a bleed valve on the M/C. well, i didn't know that. so much air came out of it there was a sense of relief. Finally, the feed back form the pedal has now gone. the light still remains. i looked at the ECU this afternoon and noticed that the pins were badly corroded. this was due to the heater matrix fault when i acquired the Rado. all cleaned up and and all back together. from there i checked all the sensors resistance from the ECU harness back and found the F/L sensor is only reading 780 ohms, not the 1-1.3k ohms required. F/L sensor is now on route and i am hopeful that this all the issues dealt with for the ABS. Fingers crossed, i'll have my Rado in for its MOT within the next few weeks. i hope!!!

im in Wiltshire. thanks anyway. i renewed discs all round and new rings when i changed the rear hubs.

just been in touch with the company, 160 for them to collect, repair and deliver. seems a bargain. hopefully gonna get it plugged in to a decent OBD1 next week and check the faults over first.

all tyres are the same all round. What do you mean 'Scanned it', are you talking about plugging the diagnostics into it? if yes, then i have plugged it in but i think i bought a crappy one from china, it won't let me erase all faults to conduct a full check. I'm getting a friend to lend me theres hopefully next week to see if i can get any other feedback.

Yeah, i had that in mind, but I'm hoping to cover all the easy bases before i start to take the ABS pump of to repair/overhaul. Just by chance, do you know of anyone who does the ABS pump overhaul?

I've checked the ABS Cage and there was no distortion. I've checked the circuit board on the light and all seems fine, annoyingly the ABS works fine! but still, once i go over 10-15cmph, the light comes on and i know that once its on the MOT roller brake test the light will come on and FAIL!!! thanks for the above ideas, but it seems that neither have sorted my issue out. id be glad for any other thoughts out there.

Sounds good, I’ll give it a try tomorrow. Fingers crossed. Many thanks

although I've been through this thread many times, it seems that the dreaded ABS light issue won't go away. i am getting my Rado (VR6 1994) ready for MOT, and all it needs, other than a bit of welding, is for me to get the ABS light to go away for good. on initial start up, light goes on, then off. then after a short period comes back on. i have from time to time felt the pedal vibrate as it pushes back at low speeds, but this has only happened after it has been sat for a while. all sensors are new, showing >1K Ohms when checked. the sensor cages are also new. the 30A fuses under the left dashboard seem to be good. I've tried to give the brakes a good pressing when driving to try and 'un-stick' the valves in the ABS pump, but still, no change. i see that some of you on this thread may have had this issue, albeit, a few years ago, is there any other areas to look at before i start to look at getting a refurbished ABS pump. many thanks in advance.

Do you have the Front Indicators, the clear ones?

Do you have the Front Indicators (Clear)?

Rob, do you still have a front left indicator unit/lense. Mine has a crack all the through and i'm trying to get it ready for its MOT.

just checked, due to some of the terminals, it can't go in the right way. never the less, its in and it works. more fault finding needed. Thanks for your help !

mines a 1994. if you have a 109 (upside down) on yours and all is fine, i dare say that mine should be the same.

I'm hoping someone out there could help a newby!! My VR6 is running fine, but i recently tried to put an OBD diagnostic system on my car to check out an ABS fault (light stays on) and it wouldn't connect to my car. After a quick look at a few simple areas i thought could be at fault, i noticed that Relay 3 (ECM) was a 109. After looking at the repair manual i have for it, it says it should be Relay 30 or 32. having purchased a Relay 30, i replaced it and the engine cut out after 2 - 3 seconds (i suspected the fuel pump had its feed cut). Is Relay 109 the correct one and the manual is incorrect, or, is it possible that someone has changed the wiring on the ECM circuit which now requires Relay 109 for it to work.

many thanks, i'll take that into conciderstion. i think i've got all the numbers need now.

Many thanks, i must have tried the wrong web sites last night.

Hoping that someone out there could help me in getting the drawings of the Dashboard, with a breakdown of which screw goes where (with Part Numbers for each screw). i know i'm missing quite a few but want to get the interior spot on. i'd like to pop down my local VW store (who only speak German due towering out here) and give them a list of part numbers and quantities. If there is anyone who has access to the VW Corrado Parts catalogue it would be greatly appreciated. Its a 1994 VR6.

Currently working in Germany, but back in the Wiltshire area as of August. once i'm back in the UK, i'll start the search for a dashboard, touch wood i'll be able to find one. regards to my heater control, i've just repaired it by using an old Golf Mk 3 and cutting and gluing the tabs. gonna fit it this Friday, so touch wood all works.

Its the dial type, but i may have made a good un out of golf mk3 control and my old one. some delicate cutting and precision gluing. i'll leave the control for now, unless the glue fails me and i'll give you a shout.

Hi everyone. Me and my 10 YO son have been doing a lot of work on it over the last couple of months. Although we haven't had the facilities that some of you may have had, we've been able to in my spare time, remove the Engine & Gbox, renew Gbox, clutch, clutch cylinder, front suspension (except shocks & springs), brakes complete, ABS sensors, Heater Matrix (with was an absolute Bitch of a job), and a few other menially jobs. Although its not complete yet, Brake MC, Front Camber Angle & Heater Motor, there are a few items which i am finding hard to find. if any of you are able to help, it'd be greatly appreciated. -Dashboard (had a accident when i removed the heater matrix and it won't sit right any more, definitely not repairable). -Heater Control, mine works but there are a few tabs snapped off for the mounting screws an the cable clamps. i'm sure i will be scrolling through the many threads on this site and asking many questions, probably bone obvious ones, but i'm looking forward to learning as many tricks as possible about my Rado.

Hi, i don't suppose you still have the front grille and the heater controls?

I have just replaced the heater matrix. PITA, and i think the dashboard may have been damaged in the process. once i put it all back together and find its not fitting properly, i will give you a shout. what price were you thinking of selling it for? also, do you have the center piece which holds the heater controls and stereo?