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Renault Laguna I - Phase 2 - Electronics - ABS Warning Light

15K views 19 replies 11 participants last post by  ArtfulBodger 
#1 ·
Hi,


I've got a renault laguna 1.6 sport 2002, the SERV and (ABS) light are showing up on the dashboard, normally these two go out when the car starts but are now present all the time.

Any ideas ?


thx in advance

Maz
 
#2 ·
Maz,

Your ABS system has sut down because a fault has been logged in the system ECU. The only way to sort this is to have the fault codes read (scanned) by a suitably equipped garage with the relevant diagnostic equipment (it doesn't have to be a dealer).

Have you done anything to the car recently in the area of the brakes or suspension? Is there anything else that has happened that could give a clue to this (driven through flood water, had new tyres fitted, etc). Anything at all might help.

Sam
 
#3 ·
ABS warning light

Thx for your advice,

I had the front tyres changed 2 days ago, on closer inspection I hanoticed a severed cablr which sits on the wishbone connected to the shaft of the passenger side front wheel, the drivers side is fine. Th cable looks to be some kind of electrical cable, I have no idea how it happedned.

thx
 
#4 ·
Maz,

It sounds like it's the left-hand front ABS wheel speed sensor wiring that has been severed. You will need a new sensor and you may need to have the fault code cleared using diagnostic equipment after the sensor has been fitted.

If this fault only occured after having the new tyres fitted, it seems that whoever refitted the wheels may have been a bit heavy handed.

Sam
 
#5 ·
i have this same problem but the abs light and serv light come on but eventually go off before coming on again later that day, we have just had a heat wave and this is when this started. i have had a friend put this on his diagnostic computer and no problems

can anyone advise

Thank you
 
#6 ·
I had ABS light showing on my wifes 02 1.8. After MANY garages saying it was the drivers side rear sensor faulty and changing it (even though Id told them other garages said the same) fault still showed. Eventually got recommended to a local auto elec (not Renault specialist) & he diagnosed corroded pins on ABS ECU. The ECU is in front of the passenger side front wheel, so probably got wet at some time. Changed the ECU (£50 from scrap yard), re-programmed to car & all OK. a few month on & fault re-appears. This time it needed another ECU & rear passenger side sensor. For now its sorted....
 
#7 ·
if it happens and you loose speedometer as well it is likely to be a 20amp fuse located in fuse box by the battery this distorts over time with heat causing intermittent contact with pins of the fuse holder, from experience as this happened on my car I racked my brain cheacked all the abs sensors wire etc eventually traced it back to this fuse replaced fuse he presto abs/speedo all working correctly
 
#9 ·
I played today with the battery box fuses, take them out and clean them searching for the front fog-lights relay ... now I have ABS lights ON and speedo does not work anymore.
I know I took out one of the 3 little fuses, I test it and when to put it back ... i couldn't find it's place anymore ... I thought it was a spare, and I left it out.
There are no connectors in the battery box for that one.
Can you take a picture from your fuse box and send it to me please? I am thinking now that maybe the connection fell of underneath the fusebox.
Thank you.
 
#8 ·
I just fixed mine. :)
It turned out to be the connector on one of the sensors. It had me fooled for a while. I tested from the connector to the sensor, mine are semiconductor types, and all were OK. So I tested back to the ABS computer, and all OK again. But the light was still on.
I removed the plug from the ABS computer and tested towards the sensors, and the fault showed up, open circuit on one sensor. The plug looks fine, clean and secure. But with a tweak of the pins the fault cleared.
The light goes out after a run, not immediately.

The pin out for the ABS computer plug is on the forum somewhere, I got it from here.
 
#10 ·
I have an 02 Laguna.
When the outside temperature is low I get the SERV and ABS lights on, but they go off when the temperature rises.
Any ideas?
I used to get a low tyre pressure warning light in cold weather, but it seems to have migrated to the ABS.
I have wondered if disconnecting the battery and reconnecting might help (in a switch it off and on again way)
Any advice welcome.
 
#11 ·
Would be looking for a corroded connection, damp getting in, and giving a false reading.
Because its going off when the car warms up. would go for the front wheels first.
These get hotter quicker than the rear, and heat will be drying the connections....
 
#12 ·
Thanks for that I will check.
It isn't the car warming up that makes it go off though it is the outside temperature.
If it's below zero outside the light is on. If it's above zero it stays off.
Oddly it started the day I got the car mot'ed.
I also jump started someone that day, so had all these panic thoughts about fried ECUs, but I'm not so freaked out now.
 
#14 ·
Oddly it started the day I got the car mot'ed.
I also jump started someone that day, so had all these panic thoughts about fried ECUs, but I'm not so freaked out now.
Have a look at the wheel bearings area. ABS sensors clip into place. One has Probably been disturbed by a fat fingered MOT Man.
Do the ABS lights Go out when engine Started? Then come on once moving, Or do they not extinguish at all?
Two Phases to test ABS. Ign on checks continuity, All present, light off. 2nd phase, ABS checks for pulses on all wheels when rolling, pulses missing, Alarms :frown2:
 
#13 ·
IF it was a fried ecu, your car wont go, as it would be your injection ECU.
See if this helps explain it better
If you think just outside the box.... Temperature drops, air is damper
As temperature warms up air not so damp.
So if we transfer these issues to your car, damp air inside the connection, as the wheel is moving you are braking, heat is formed (kinetic energy can not be destroyed), this then warms your connection, as though the weather has warmed up.
So as you drive your car with your light on, then the heat dries the connection.
Once the ignition goes off, then switched back on, your abs system does its own self test, no issues found, light stays off.
 
#15 ·
If it has the toothed reluctor rings behind the front brakes check they are
tight not cracked or covered with grease from a split cv boot.
 
#16 ·
It is intermittent.
The only consistent thing is that the lights stay on when it is cold outside.
The lights can be fine one day (i.e. they go off normally as part of the ignition sequence and stay off) or they can stay on from the minute I start up, which only seems to happen when the outside temp is below 0 degrees.
I have had the warning lights go off when the outside temp goes from -1 to 0 then come back on again when the temperature dips.
I don't think it is related to drying out as I haven't driven it far enough for that to happen.


Bizarrely, I used to get a similar fault on one of the tyre pressure sensors ( cold days only) which has stopped since the ABS lights started acting up.
 
#17 ·
Drive your car a quarter of a mile, and feel the heat generated, just by touching your wheel.
You will be surprised how hot the wheel will get...
Its an intermittent fault, so pointing to a connection issue, not a complete sensor failure issue...
 
#19 ·
If your light is on, once your car warms up, switch ignition off, take card out.
Then restart, self test will extinguish the light for you.
The connector pushes into the hub, just to the side of where the cv joint goes in.
 
#20 ·
Curious development.
Drove 25 miles on Tuesday night, no warning lights.
Picked son up for 200 mile drive to Birmingham, ABS lights stayed on for 120 miles or so. (Raining fairly heavily, and outside temp 3 degrees or so)
I stopped the car in traffic and switched ioff / removed key card and started up again.
Lights were on when I started but went out shortly after.
Stayed off all the way to Birmingham.
No issues at all on Wednesday.


Will check connections at first opportunity.
 
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