2002 ML320 Electrical Problems
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2002 ML320
2002 ML320 Electrical Problems
Hello Everyone,
I've been a frequent reader, but I'm a first-time poster.
I am have several issues with what seems to be unrelated electrical systems. I'm hoping that someone can help point me in the right direction.
I'll start with a list of symptoms:
My first thought is that it might be the AAM, but then I've been reading that there could be some ground issues. Perhaps a mixture of both?
I'm not an electriction, but I'm not afraid to try new things.
Thank you so much for your help!
I've been a frequent reader, but I'm a first-time poster.
I am have several issues with what seems to be unrelated electrical systems. I'm hoping that someone can help point me in the right direction.
I'll start with a list of symptoms:
- rear o2 sensors not recognized
- all break lights come on occasionally
- ESP (orange triangle) will engage on dry asphalt
- driver door does not lock
- cruise control does not engage
- FM tuner does not work, but CD and AM work fine
- volume will change itself
- sometimes vehicle will stall and then go when try to begin accelerating
- EGR code has been thrown, but no mechanical diagnosis has found anything
My first thought is that it might be the AAM, but then I've been reading that there could be some ground issues. Perhaps a mixture of both?
I'm not an electriction, but I'm not afraid to try new things.
- Has anyone else had these problems?
- What types of tools do I need to diagnose?
- If I have the tools, where should I start?
Thank you so much for your help!
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Joined: Oct 2011
Posts: 7,107
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From: Bronx, N.Y.
2002 ML 320 & 2006 ML500
- rear o2 sensors not recognized What do you mean by not recognized? What are the code numbers?
- all break lights come on occasionally See below.
- ESP (orange triangle) will engage on dry asphalt See below.
- driver door does not lock Is it that the button does not go down?
- cruise control does not engage See below.
- FM tuner does not work, but CD and AM work fine Possibly an internal fault in the radio.
- volume will change itself Does the volume change to high?
- sometimes vehicle will stall and then go when try to begin accelerating Explain in detail.
- EGR code has been thrown, but no mechanical diagnosis has found anything You must post the exact code/s.
Remove the panel under the driver's instrument panel and access the brake light switch. First check to see that it is partially blue in color. The blue colored switch confirms that it was replaced per a recall.
Regardless if it is blue or not, remove the elec. connector and twist the switch clockwise and remove. Then follow the instructions in the pdf. Pull the pin out all the way, manually press down on the brake pedal and insert switch and lock in place. Then release the pedal and pull up on the brake pedal and connect the connector. Then see if any or all of the problems recur.
If you do not have a blue switch, go to a dealer and purchase the latest one, #001 545 95 09 and install the new one the same way as above.
https://mbworld.org/forums/m-class-w...ml#post5812567
https://mbworld.org/forums/m-class-w...ml#post5039586
Thread Starter
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2002 ML320
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From: Brisbane, Australia
2002 ML320, 2003 A160
This is a feature. Stops you locking yourself out by pressing the dashboard lock button with the door open, leaving the key in the ignition, and closing the door behind you.
So is this. Your ML may have an emergency call system that mutes your radio so the call centre operator can hear you. Sometimes the e-call module thinks you've crashed and starts calling.
If you don't have an owner's manual, you can download one.
- volume will change itself
If you don't have an owner's manual, you can download one.
Thread Starter
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2002 ML320
Your ML may have an emergency call system that mutes your radio so the call centre operator can hear you. Sometimes the e-call module thinks you've crashed and starts calling.
Last edited by zebtesstwiletey; Aug 7, 2015 at 01:58 PM. Reason: add quote
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From: Harare, Zimbabwe
2003 ML55,2007 ML63
There is......Read post #9. Buy the loop, install it, then remove the module & throw it away.
I have edited my post. I forgot the OP is still going to use the MCS.
I have edited my post. I forgot the OP is still going to use the MCS.
Last edited by art_arev; Aug 9, 2015 at 03:16 PM.
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2002 ML 320 & 2006 ML500
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