Laguna Late Mk1 abs ECU can be fixed - Renault Forums :: Independent Renault forum

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post #1 of 3 (permalink) Old 27th March 2007 Thread Starter
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Talking Laguna Late Mk1 abs ECU can be fixed


My abs stopped working a few weeks ago and had STOP,SERV,Handbrake and ABS lights on.

I have spend the last two weeks searching for information on the system and how to fix it.

After paying a garage £45 for codes to be read, they said power relay fault and would probably need new unit at £500 plus labour.....not likely as the cars only worth 1.5k at best.

I took the ABS controller out (Teves MK20i), easier than it looks and spent the last week fixing it. You can still drive without the abs ECU as the brake circuit is sealed.

Took me 1 day to get inside the thing (well sealed), not a power relay in sight (all done with power mosfets). Found the fault easy, bad connection on power pins, resoldered all connections and the stop light went out on the bench but still had abs light.

After a week of searching for info on reading codes from it, found out that all you have to do is simulate driving above 12 mph and the damn light went out.

So in conclusion :-


Power fault on pins 3 or 4 or blown fuse F18/F24.


Bad connection at abs ECU on multiplug ( bugger to disconnect )

ABS/SERV lights can be lots of different problems :-

Fuse F9/F10 blown or bad connection (these are 30A in the engine comp)

Wheel sensor open circuit/dirty

Pump open circuit

Solenoid open circuit (can only be checked by opening ecu )

Internal track fault as mine was (again, can only be found by opening)

When you have the unit disconnected, quite easy to check some of above and find the probable cause.

Hope this helps someone else avoid costly rip off......
Currently in stevedrink's garage:
2000 Laguna I 1.9DTi
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Laguna Late Mk1 abs ECU can be fixed Electronics Richardw 2 2514 27th March 2007 07:20 PM
LagDti - Do you have any info on teves ABS Electronics stevedrink 3 1166 24th March 2007 01:56 AM
Laguna ABS warning lights Cars & motoring stevedrink 5 4469 10th January 2007 11:58 PM
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post #2 of 3 (permalink) Old 28th March 2007
Let's be carefull out there
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great post Steve.
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2000 Scenic 2.0 16v Monaco, BMW 3 Series, Pug 206
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post #3 of 3 (permalink) Old 30th August 2009
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Did the unit reset automatically or did it need to be reset by a dealer .....?

Thanks in advance for reply.
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abs , ecu , fixed , laguna , late , mk1

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