ASSYST Reset

[nomad464]

Hi All,

I've been really happy with my purchase of a V plate A-Class last September but haven't had the chance to drive it much as I work away from home. The battery went flat a over the last week as it's been so out of use and now I get the ASSYST message telling me its 3800 miles over due a service! I categorically know that last weekend it flashed up with 7500 miles to go! Any ideas? Or am I going to have to fork out for a service?

Kind regards.

 

[pascal]

Why

It can be reset manually, but will then mess up the service records.

Do you know mileage & date of last service?

You can extend the service period by adding oil (not past maximum), as assyst measures oil quality.

I can tell you how it's reset in an SL(r129) if you really want to do that, but you should only do this if you have got the car serviced by someone whom has not got the re-set equipement after the service.

 

[nomad464]

Thanks for that. But I'd kinda like to know why, since the battery went flat, that ASSYST skipped forward 11300 miles. My point is that last weekend it was 7500 miles from a service and this weekend its 3800 miles over due. Surely this can't be right? I don't want to reset it if it's going to mess up the service history.

 

[SLinKyjoe]

I assume it has a full service history? I would be tempted to call in at a local MB dealer and ask kindly if someone will reset it for you. they can then adjust the count down to read the approx milage left for the next service due date......if they are expecting it to come to them they should be happy to do this for you. First thing in the morning or just befoe lunch will get best results.....not on your way home in the evening.

Unless some one posts the way to do they for you. it isnt that difficult but i notice the new manuals neglect to inform you how to do it.

 

[pascal]

Here

Nomad,

This is how you reset an SL assyst. Don't know about the A, I think some MBs count up instead of down

When you press the left button twice quickly, time or miles remaining before next service is displayed (also displays itself close to service due time). If there is a minus sign if front of the number, this is the overdue figuire. I doubt if the previous let it go 9k past service. He probably serviced it himself and did not know how to reset the assyst.
I think that you are correct in getting the car completely checked and serviced as a precaution.
I would give it a full service plus exta items, all fluid changes etc.
Also I would not bother going to a main dealer. A good local MB specialist will do all this work.
Sat nav CDs are available on Ebay. Good Luck with your new car.

RESETING ASSYST

• Turn key to position '2'
• Immediately press button 1 twice within 1 second (assyst displays)
• Within 10 secs, turn key back to '0'
• Press button 1 again and 'hold' whilst turning key back to '2'
• Keep button pressed till sound is heard
• Release button

Pascal

 

[nomad464]

Thanks.

Thanks very much. I'll probably try and drop in to an MB dealer at some point to get it sorted.

Kind regards.
8)

 

[philharve]

Resetting ASSYST and ASSYST operation

Hi All

I'm interested in the ASSYST system and what happens when it is reset. I'm not too concerned about how to reset it, just what happens when it is reset.

My perception of the ASSYST system is that is contains, among other things, a set of single-bit registers (flags), one for each subsystem capable of issuing a service request. If a subsystem detects that service is required, e.g. change the oil, replace the disc pads, check coolant level, change the spark plugs, change the air filter, etc., the associated subsystem sets its flag. If ANY flag is set, the service indicator (spanner) illuminates to indicate that a service is required. True, or false?

If a service is performed, e,g, oil changed, disc pads replaced, coolant topped up, new spark plus fitted, air filter replaced, etc., is each of the flags reset AUTOMATICALLY, or is a MANUAL reset required? I assume that only when ALL the flags are reset will the service indicator extinguish?

Take a particular example: suppose the disc pads are getting thin and must be replaced. There may be a timer associated with this subsystem which indicates how long before the pads MUST be replaced. When the 'disc pad wear' subsystem detects replacement is required, it sets its flag which also illuminates the service indicator. True or false?

Now ... assume the pads are replaced, does the 'disc pad wear' subsystem detect that new pads have been fitted and resets its own flag AND thereby extinguishes the service indicator IF no other flags are set? Or must action be taken by the service engineer to reset the flag(s)?

I assume that ASSYST system records information in its memory indicating when flags are set and reset and it is possible to examine these records using suitable diagnostic equipment?

Is this, in essence, how the ASSYST system works? If it isn't, is there a technical description of how it operates somewhere? I haven't yet found a good description.

The reason for making this inquiry is to satisfy myself that if two or more flags are set, resetting the ASSYST system doesn't reset both flags unintentionally. For example, consider the 'disc pad wear' subsystem and 'coolant level' subsystem. If both there flags are set and the coolant level is topped up, there is no possibility that the disc pad wear flag will be inadvertantly reset too WITHOUT the disc pads being replaced? This could be expensive if new discs are required and potentially dangerous if no disc pad material is left.

REGARDS Phil

 

[steve_k243]

Phil

I would have thought that the brake pad thickness indicators simply cause the light to come on when the pad wears enabling the sensor to complete the circuit. Independent of ASSYST entirely. A dealer etc will not reset ASSYST for a brake pad change.

My way of thinking is that it will be entirely independent of ASSYST as brakes are an "on condition" service item, and as a safety measure should be changed ASAP after the light comes on. It would be pointless doing any other service tasks at this time, unless within, say 500/1000 miles of a predicted service.

IE you wouldn't want to change 8 litres of expensive Mobil 1 etc with only 2000 miles on it!

I think it unlikely that air filters, coolant level or spark plugs have a register (flag) on them.
Oil level, temp variables, driving style, oil viscosity and temp, oil quality, oil filter bypass valve would I reckon be some of the flagged items. Oh and mileage!

 

[steve hw]

anyone know if ressetting assist on ML320CDI possible manually. it has multi function steering wheel. Thanks

 

[Paul S320CDi]

You can extend the service period by adding oil (not past maximum), as assyst measures oil quality.

Is that true or are you just wishing that was the case? I have no inside knowledge so I am not saying you are wrong.


As regards each subsystem having it's own service flag... I thought ASSYST just worked on time/miles driven/type of miles driven and flagged for a serivce of type A or B or whatever when it thought it was needed. It would then assume that the service requested had been carried out and new oil/air filters/plugs etc had been fitted as per service schedule.

It would be impractical and financially ruinous from the owners point of view to have to take the car in because the spark plugs needed replacing then next week take it in for the pollen filter, then later that afternoon back in for brake fluid change.

 

[carabind]

assyst intervals vary tremendously - I can only speak for the E class, but driving style and adding new oil can entend levels on the 210.

On newer models, it seems fixed, despite what everyone tellyou. On my old 2005 211, it fell to 9500, but the current one (2007) it is 15k miles, and I believe this is fixed. Far better, and should save me 3 services or £1k over say 90k miles! Only downside is that I have to actually top up te oil at 10k miles. needed a litre at £15.00!

 

[ML320CDIssues]

Does anyone know how to Reset ASSYST on a ML320 CDi March 2008 model? Please note that I have a multifunction sterring wheel but have a R button within the cluster section.

I've tried the Turn Key to 2 approach and end up witha menu that I am finidng difficult to move within or select within. Whats concerning me is that the Service A is due within 20 days even though the car has only done 5k miles and within the display, it states that I have a further 10k to do before the service.

 

[Blobcat]

Does anyone know how to Reset ASSYST on a ML320 CDi March 2008 model? Please note that I have a multifunction sterring wheel but have a R button within the cluster section.

I've tried the Turn Key to 2 approach and end up witha menu that I am finidng difficult to move within or select within. Whats concerning me is that the Service A is due within 20 days even though the car has only done 5k miles and within the display, it states that I have a further 10k to do before the service.

Warranty issue, I would talk to your dealer about it. There is a reset procedure in the DIY section on the forum

 

[eddobd]

Hi all . My name is Edd and I need help .
I have a Mercedes E220 W211 Facelift in 2008.
Service message D appeared for 28 days. I tried to do the reset from FSS and it gives me service not confirmed message. What do you think should be done? Thanks

How can I do Reset Service D due to MB Star C4 or how can I reset this service if it doesn't work with FSS
i tried to reset the steering wheel but service not confirmed.

The reset is done with Xentry Das but I don't know how. You think there is someone who can help me with explanations to solve this problem with STAR DIAGNOSIS MACHINE.

Many thanks