Question about 1999 Mercedes-Benz S-Class

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ABS & ASR lights come on together intermittently and steering becomes heavier at the same time. After switching engine offf and on again both lights go out and normal service is resumed.... 1996 model mercedes benz S500. I have a 1997 S500 and the ABS & ASR lights come on intermittently when the car is turned off and turned back on they go off but after a while come back on

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Check the brake fluid. If it is ok, take it to the dealer and have the abs codes read.

Posted on Jan 05, 2009

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When your car loses power, that's your car going into limp mode home.

Alone that means your ASR is malfunctioning, obviously

And the unfortunate thing about ASR on these cars is that chasing down the problem is like finding a needle in a haystack, there's no finite way of determining the problem.

Best bet is to get your codes read and see if anything shows up there because it can be a modicum of things.

Speed sensors, throttle body, idle control, wheel sensors, even the entire ECU.

What's the condition of your wiring harness as that's the most likely source of the problem if it's original.

While ASR is very nice to have in the inclement of bad weather, it only is nice when it works.

Sorry to hear about the problem, but anything ASR related isn't usually very cheap.

Posted on Jan 05, 2009

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  • blueextc3221
    blueextc3221 Jan 05, 2009

    ASR stands for "Acceleration Slip Regulation" and it is Mercedes way of guarantying that the wheels have equal traction when you need to accelerate quickly. But the ASR system is tied to all of the electronic systems (EA and LH-SFI) in the car, so everything needs to be working otherwise the car is forced into the "limp-home" mode (LH).

  • blueextc3221
    blueextc3221 Jan 05, 2009

    This site may give you more insight on the problem.



    BTW, have you gotten engine codes yet?

  • blueextc3221
    blueextc3221 Jan 05, 2009

    Think of ASR on these cars as the glue for the entire electrical system; there is no way to just "disconnect" it from the car. You have to fix the systems/components that interoperate with it. Then, you're likely focusing on 2 culprits - either the harness or the actuator. Installed, that's about 2k in repairs total, unless you can DIY. These are 2 things that are must-fixes on the ASR-cars even as preventive items. Both these were done on my car right before I bought it, and I still got an ASR light, limp mode, and no cruise control - because of a faulty left taillight assembly. The contacts go bad on these, and can cause all kinds of ASR shenanigans. Cheap DIY reapair. After that, you are indeed looking at speed sensors, wheels sensors, all the small components that 15 years of the elements will eventually destroy - but I imagine these are relatively easy DIY repairs.



    Yours may be tied into the ABS Sensor malfunction. Get the codes checked and report back.

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There is some problem with wireing of car check them

Posted on Jan 05, 2009

  • rockfixya
    rockfixya Jan 07, 2009

    did you try the solution given to u.

    Thanks for using FixYa.

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SOURCE: ABS & ASR lights come

abs light comes on and off during normal driving conditions also surges forward when the ligt turns off

Posted on Dec 30, 2008

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Gear shift stays in park and abs esp and asr lights on


1) try to use the self diagnose.
2) place ignition swtuch in the start position, the lights coming on
3) engine starts, the brake light sould turn off inmediately. the ABS ligth will illuminate for aprox 6 seconds.
4) test drive the vehicle at speed above 20mph for a few minutes. during the test the both test lights should remain off, if any one of the warninign light utron, take note of the condition.
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Anti-lock system light on


Anti-Lock Braking System (ABS)
Purpose Anti-lock brake systems (ABS) - generally also referred to as anti-lock
systems (ALS) - are designed to prevent the vehicle wheels from locking
as a result of the service brake being applied with too much force, especially
on slippery road surfaces.
The idea is to maintain cornering forces on braked wheels to ensure that
the vehicle or vehicle combination retains its driving stability and manoeuvrability
as far as physically possible. The available power transmission
or grip between tyres and carriageway should also be utilised as
far as possible to minimise the braking distance and maximise vehicle
deceleration.
Why ABS? Although today commercial vehicle brakes are designed to a very high
technical standard, braking on slippery roads often results in potentially
dangerous situations. During full or even partial braking on a slippery
road it may no longer be possible to fully transfer the braking force onto
the road due to the low coefficient of friction (friction coefficient (k)) between
the tyres and the carriageway. The braking force is excessive and
the wheels lock up. Locked wheels no longer provide any grip on the
road and are almost incapable of transferring any cornering forces
(steering and tracking forces). This often has dangerous consequences:
- The vehicle becomes unsteerable
- The vehicle breaks away in spite of countersteering, and starts to
swerve.
- The braking distance is significantly increased
- Tractor-trailer combinations or semitrailer trains may break away or
jackknife.
Load sensing valve influence On dry roads today's load sensing valves (ALB) alone are often capable
of preventing the wheels from locking if the vehicle is unladen; they also
help the driver to effectively grade the braking process on wet road surfaces,
but they are unable to prevent locking as such (no slip monitoring).
In addition, they are unable to counteract any overreactions on the
part of the driver, or any variances in frictional or adhesion coefficients
which may apply to different sides of the vehicle, or indeed to its different
axles (?-split road surfaces).
Benefits of ABS: Only the Anti-Lock Brake System (ABS)
- guarantees stable braking characteristics on all road surfaces.
- maintains steerability and generally reduces the braking distance
- prevents vehicle combinations from jackknifing
- reduces tyre wear.
Limits of ABS Although ABS is an effective safety device, it can not suspend the limits
defined by driving physics. Even a vehicle fitted with ABS will become
uncontrollable if driven too fast around a corner.
So ABS is not a licence for a maladjusted style of driving or failure to observe
the correct safety distance.
4
ABS Training Anti-Slip Regulation (ASR)
Anti-Slip Regulation (ASR)
Why ASR? Increasing the engine output (accelerating) on a slippery road surface
can easily lead to the maximum adhesion on one or all powered wheels
being exceeded causing them to spin, especially if the vehicle is unladen
or partially laden.
Spinning wheels when driving off or accelerating represent a safety risk
just like locked wheel do when braking.
Reasons - Wheels that spin transfer just as little cornering force as locked
wheels.
- They also no longer transfer any tractive power onto the road.
Consequences - Vehicles that do not move or get stuck.
- Vehicles that can no longer be steered, jackknife on uphill uphill
gradients, or swerve in corners.
Benefits of ASR ASR prevents the powered wheel from spinning and provides the following
benefits:
- Tractive power and cornering forces are maintained.
- Stable driving behaviour is ensured when moving off, accelerating
and negotiating corners on slippery roads.
- The indicator lamp (if installed) is used to warn the driver of slippery
road conditions.
- Tyre wear is reduced to a minimum, and the motor vehicle's drive
train protected
- The risk of accidents is further reduced.
ASR and ABS: ASR represents a worthwhile addition to an ABS-controlled braking system.
All that is required to turn ABS control into full ABS/ASR control is
an ECU with the additional ASR function and a few additional components
for controlling the differential brake and the engine. This why ASR
is only available in combination with ABS.
Even a differential lock for off-road use and ASR do not exclude but complement
each other.
Limits of ASR The traction capacity of an all-wheel driven commercial vehicle can not
be achieved by a motor vehicle with only one driving axle - not even with
optimal ASR.

anti-lock-system-light-vi1ay411tmzjz03ru4fkmxgj-5-0.jpg

anti-lock-system-light-vi1ay411tmzjz03ru4fkmxgj-5-2.jpg

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