Question about 2002 Mercedes-Benz M-Class

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2002 ML500 will randomly not start. Battery check shows its fine. Also have trouble at times with electric windows for driver and front passenger randomly not working. Battery connections checked okay. Any information out there?

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You might need to tap on relays,if it solve problem replace them

Posted on Nov 11, 2013

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are the battery terms clean, this is a service point.

will it not crank or not start, your no start makes no sense.
no car can start if it cant crank, so..... (i can push start mine,with stick shift tranny)

random sux. it's the most expensive word in the eng. language.
ILL pretend you meant ,IT WILL NOT CRANK.
well we do know 4 things and that is
1: the battery can bad, why not use a substituted, (#1 all time failure rate on all cars since 1920 to now, ) barrow one.
2: it has bad connections.
3 bad starter or soleniod.
4: bad key line (small wire on solenoid running back...all can fail)
you can guess, and go broke, or do that tests.
it is your choice, all time record forums is

the other things dead means the connections are bad.
called Main power DC distrutution.
did the windows fail , key on, or only cranking.
ill guess at only key on. they fail. (key point that)
in fact I alway fix power loss to the most basic simple devices.
#1 is head lights fail or dim with fan/and defrost (year) on.
i load up the bus and see if my HL have full brightness.
the fan , is it weak., with all major loads on>?
I fix that first.
and is childs play simple using any voltmeter 20v.
you go to the battery, and across it its 12.6v rested at bat. lugs!
you then turn on fan,defrost and HL.
the battery can do 2 things.
1: say above 12v.
2: drop way low, say below 11v.

if the battery drops its bad, (cranking can in fact drop a battery to 10 or if in alaska 9v)
but if the lamps dim and the batter is 12v
you have bad wiring, no ifs, ands or buts.
ok the wiring is bad, move the red lead down stream from
the bat, PLUS lug, to the fuse Engine bad fuse box.
this is MAIN box. it must have 12v with loads stated.
what i do with schematic in hand is follow that path
the whole way to the head lights.

The stater will not engage if the key line does not go to 12v
10 -18v is the spec on all cars. running.
the starter solinoid coil dies, at 8v,and starts clatttering.

ok lets say the HL are full bright under full loads.
A/T tranny on MB no sticks id bet. (transmission = tranny)
wiggle the brake pedal, the gear shift in park, does it crank>? now
or try starting in Neutral, (this picks off fresh brass in the PRNL switch (yes, ive cleaned many) and does it crank now?
no , then take a small hammer and hit the side of the starter
does it crank now.?
a mech,does all this, with out thinking,its, same o, same o.

then i hot wire the starter soleniod
crank now? (bad key line)
no?, bad starter, bad battery or bad cables. (in truth?, i do this first ,no crank, if terminal on battery are clean.)
if i walk up to battery and it reads 10v, a cell is open.
(or is grossly discharged)
i also have a huge inductive amp clamp meter, (they are cheap today) and check starter current. 100amps is a hot day 1.6L cars
and up to 500 amps on a big engine in Alaska. dead winter.
if the current goes to (tries) to infinity the starter is shorted.
or jammed the engine is seized.
only 2 tools, a volt meter and an ammeter and the truth be known.

Posted on Oct 10, 2013

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Posted on Jan 02, 2017

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SOURCE: I have a 1998 Mercedes

Probably a short in wiring. Vibration are causing contact to go on and off, check circuit and connectors with a tester.

Posted on Aug 14, 2008

  • 6966 Answers

SOURCE: 1998 Mercedes Electrical / Electronic Issues


From all indications, most of your devices are controlled by a common module. This would be similar to the engine management computer but has the responsibility for all those mentioned and then some. if you would notice, most if not all are non essential to the engine's performance. Initial suspect would be such a module and/or the sensors, connectors to it. Being such as multi input and multi output, it is perhaps to your advantage to seek the services of a qualified professional. If you are considering a DIY (do-it-yourself), then access to a full service manual would make things doable if not easier.

Often this control module would be under the dash or on any of the kick panels.

Hope this be of initial help/idea. Pls post back how things turned up or should you need additional information.

Good luck and kind regards. Thank you for using FixYa.

Posted on Aug 14, 2008

  • 2 Answers

SOURCE: drivers side front electric window

The common factor to them is they are in one wireing harness going into the door. Has something crimped it or pulled the connections apart?

Posted on Oct 10, 2008

  • 194 Answers

SOURCE: A160 classic model 2002

starter could need to be replaced just getting to week

Posted on Dec 05, 2008

  • 580 Answers

SOURCE: No power to electric windows and interior courtesy lights

This is a common problem, but I've never seen a window regulator go bad in a Mercedes, the problem is probably the switch, you can check his by removing both working and nonworking window switches from the console, and plug in the other side or rear to roll the windows up/down,you will need to disassemble the switch that does not work and clean it well then, it will work again I've done it to my Mercedes

Posted on Jul 15, 2009

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Dec 10, 2009 | 2002 Chevrolet Tracker

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Hi Ethel101
I think that what has happened with your vehicle, is that the master (driver control) switch has become defective....If you have a friend who is good with electronics you may be able to ask for help in getting it fixed....otherwise a new unit is needed.

Best regards


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