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I have a 97 ml320 and I had to have a key cut and programed…

Customer Question
Hey! I have a...

Hey! I have a 97 ml320 and I had to have a key cut and programed by a locksmith. No fob, blade only with chip. The key cranks the car and it drives but the locks all go crazy and the hazards won't stop flashing

Mechanic's Assistant: Have you checked the fob's battery?

There is no fob

Mechanic's Assistant: Are you fixing your ML320 yourself? What have you tried so far?

Yes. Like I said had the key cut and programmed. It starts the vehicle and it drives but the hazards won't go off

Mechanic's Assistant: Anything else you want the mechanic to know before I connect you?

That should be it

Submitted: 7 months ago.Category: Mercedes
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Answered in 8 hours by:
12/5/2017
Mercedes Mechanic: Pete, Mercedes Mechanic replied 7 months ago
Pete
Pete, Mercedes Mechanic
Category: Mercedes
Satisfied Customers: 32,975
Experience: Over 15 years experience as a Mercedes dealer technician
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My name is ***** ***** I am a professional here at Just Answer. I noticed that your question had not received a response and thought I would see if you still need help with this.I apologize for the delay and I hope I can still assist you with this here.

The first thing that needs to be done here is to have the fault codes read out/checked to see what codes are set to this issue here.This has to be done with a scan tool or computer plugged into your model that can read all computers in your vehicle.Once this is done any codes set then need to be diagnosed to then locate and repair this issue here.Usually having a new key won't cause these issues with the locks and hazards.It sounds like a fault with a control unit acting up or issue with a loose power or ground input.If you can get the codes read out and post the code info here this will help just let me know.

If more help is needed, use the reply tab to continue our conversation. If no further assistance is needed, kindly rate my service, your 5-star rating is appreciated ( should be a link to click on here or above).You can rate at any time and we can continue to work on your question as this will not close out your question.Keep in mind in some cases it can be difficult to fully diagnose or help repair your vehicle without seeing it and I work on delivering the best possible answer from what I see to work with.

Thanks Pete

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Mercedes Mechanic: Lou P. master tech, Mercedes Technician replied 7 months ago
Lou P. master tech
Lou P. master tech, Mercedes Technician
Category: Mercedes
Satisfied Customers: 6,094
Experience: 20 years Master Certified excellent fix rate and have access to factory wiring, and instructions.
Verified
Hello , Lou here, are you still needing assistance ?
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Mercedes Mechanic: Lou P. master tech, Mercedes Technician replied 7 months ago
Ok so where are you at at this point ?
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Customer reply replied 7 months ago

Hey! I have a 97 ml320 and I had to have...
Hey! I have a 97 ml320 and I had to have a key cut and programed by a locksmith. No fob, blade only with chip. The key cranks the car and it drives but the locks all go crazy and the hazards won't stop flashing

Mechanic's Assistant: Have you checked the fob's battery?

There is no fob

Mechanic's Assistant: Are you fixingyour ML320 yourself? What have you tried so far?

Yes. Like I said had the key cut and programmed. It starts the vehicle and it drives but the hazards won't go off

Mechanic's Assistant: Anything else you want the mechanic to know before I connect you?

That should be it
04 December 2017 10:02Pete Pete
Mercedes Mechanic
My name is ***** ***** I am a professional here at Just Answer. I noticed that your question had not received a response and thought I would see if you still need help with this.I apologize for the delay and I hope I can still assist you with this here.The first thing that needs to be done here is to have the fault codes read out/checked to see what codes are set to this issue here.This has to be done with a scan tool or computer plugged into your model that can read all computers in your vehicle.Once this is done any codes set then need to be diagnosed to then locate and repair this issue here.Usually having a new key won't cause these issues with the locks and hazards.It sounds like a fault with a control unit acting up or issue with a loose power or ground input.If you can get the codes read out and post the code info here this will help just let me know.If more help is needed, use the reply tab to continue our conversation. If no further assistance is needed, kindly rate my service, your 5-star rating is appreciated ( should be a link to click on here or above).You can rate at any time and we can continue to work on your question as this will not close out your question.Keep in mind in some cases it can be difficult to fully diagnose or help repair your vehicle without seeing it and I work on delivering the best possible answer from what I see to work with.Thanks Pete_____The car would not start and drive if it was a ground

Customer reply replied 7 months ago
Pete seemed to be more interested in my rating than getting the answer to my question
Mercedes Mechanic: Lou P. master tech, Mercedes Technician replied 7 months ago
Gotcha, ok so does the fob lock and unlock the doors ?
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Mercedes Mechanic: Lou P. master tech, Mercedes Technician replied 7 months ago
Lets go over a few basics to see what is going on .
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Customer reply replied 7 months ago
There is no fob. Lost the keys. No extras. Had new one cut. It starts the car but the hazards and locks and radio go crazy as if it's a security system issue
Mercedes Mechanic: Lou P. master tech, Mercedes Technician replied 7 months ago
Ok, so only the hazards should flash along with alarm.
So when do the locks go crazy?
When you start the car or when you drive off or when you lock the doors ?
Also was everything fine up until this new key? Can you send me a picture of it ?
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Customer reply replied 7 months ago
There was no key when I got it. It was towed to my house. The lights do this when I start the car. I don't know if the horn works so that may be going off too and I don't know it. The car starts and drives but the hazards won't go off and the locks keep going offand it never accelerates fully (maybe unrelated).
Mercedes Mechanic: Lou P. master tech, Mercedes Technician replied 7 months ago
Ok sounds like you have a whole slew of problems. Lets talk about the locks, when do they act up?
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Customer reply replied 7 months ago
At the same time as the lights when the car is started
Mercedes Mechanic: Lou P. master tech, Mercedes Technician replied 7 months ago
Ok, so i thing we have a power supply problem. I am currently commuting i will be back soon
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Mercedes Mechanic: Lou P. master tech, Mercedes Technician replied 7 months ago
Ok so in my experience and thought its not the alarm or else the car would not start. Does this happen when the key is turned to the first ignition position? The second position? Or only when the car is running?
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Customer reply replied 7 months ago
It happens in all key positions
Customer reply replied 7 months ago
I read somewhere that if there is another key somewhere in or on the vehicle then the two signals would make it act up
Mercedes Mechanic: Lou P. master tech, Mercedes Technician replied 7 months ago
Ok, so then i would be interested in powers and grounds and checking for water marks inside the drivers side engine bay fuse box
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Mercedes Mechanic: Lou P. master tech, Mercedes Technician replied 7 months ago
Also the only thing inside the car that recognizes a key is the ring around the ignitikn switch. Nothing else. So no two signals are not affecting anything. Also if there were a security issue the car would start and then die. I think the from AAM module which is actually attached to the underside of your fuse box eithet got damaged or has water in it .
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Customer reply replied 7 months ago
How do I address these issues so that I can drive down the road without the flashers on?
Mercedes Mechanic: Lou P. master tech, Mercedes Technician replied 7 months ago
Ok so it all depends on if you know how to work on cars and what we can do to fix this. Would definitely need a test light and possibly a meter but a test light is always helpful. We would need to see where the signal is coming from.
We would need to pull a few relays to see if it will stop the flashing lights and locks. The relays are all labeled under the lid of the engine bay fuse box
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Customer reply replied 7 months ago
Let's say I don't know how to work on cars but I'm good at following directions. I'd be happy to rate you and you don't have to wait on any more responses from me if you could just walk me through what comes after checking the relays.
Mercedes Mechanic: Lou P. master tech, Mercedes Technician replied 7 months ago
No worries I am in no hurry for rating even though you might be getting emails about it so no worries there and as far as following directions we can do some simple things to try without needing expensive equipment
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Mercedes Mechanic: Lou P. master tech, Mercedes Technician replied 7 months ago
I am not near my computer currently but is soon as I am in the next few hours I will go over the wire diagram and give you some things to try if you could I will need the build date of your car off of the sticker on the driver side door
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Mercedes Mechanic: Lou P. master tech, Mercedes Technician replied 7 months ago

OK SO relay K15, K20, K23,K24

all affect locking and unlocking, so lets pull one at a time to see if the lock issue changes.

like first pull out k15 and turn the key on, if the issue does not change, put it back and then remove k20 and recheck, so on and so forth.

lets see if we can get the locks to stop cycling.

for the hazards i will check.

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Mercedes Mechanic: Lou P. master tech, Mercedes Technician replied 7 months ago

K7 and K4 are for the turn signals left and right.

i am not sure if there is an additional relay but i am still checking

the signals are actuated by the aam module.

aam stands for all activity module

i think the module is faulty myself.

Lou

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Mercedes Mechanic: Lou P. master tech, Mercedes Technician replied 7 months ago

what i want you to do with the k4 and k7 relays are the same as the other, take one out turn the key on and see what changed.

then reinsert it and take the other one out and then turn the key back on and see what changes.

Lou

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Customer reply replied 7 months ago
You're awesome. Sorry show kept me from responding. Not used to it in Georgia.Built 10/98
Customer reply replied 7 months ago
I'm about to rate you but does that mean we won't be able to talk anymore
Mercedes Mechanic: Lou P. master tech, Mercedes Technician replied 7 months ago

did you mean snow? lol

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Mercedes Mechanic: Lou P. master tech, Mercedes Technician replied 7 months ago

oh no, rating just pays me for helping. it will not close us out.

there is no time frame. we are good until you are satisfied.

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Customer reply replied 7 months ago
snow ha. You're a nice guy. Okay so I'm doing the relay thing now
Mercedes Mechanic: Lou P. master tech, Mercedes Technician replied 7 months ago

ok sounds good.

well thanks for the compliment.

too many people get taken advantage of with cars . I am just one tech fighting the good fight to let people know that there are caring, compassionate techs out there with actual knowledge. I love to help and this site gives me the chance to help others.

plus i dont get dirty typing on a keyboard :)

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Customer reply replied 7 months ago
The relay for the anti-theft is out of it. So how do I get the anti theft to stop?
Mercedes Mechanic: Lou P. master tech, Mercedes Technician replied 7 months ago

what do you mean out of it? its not there? or you removed it and nothing changed?

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Customer reply replied 7 months ago
Also when I start it the miles spot comes up with a wrench and the numbers 23400
Customer reply replied 7 months ago
It's not there. It was already out.
Customer reply replied 7 months ago
Can you call me? It will save so much time but I don't have the money to click the button
Mercedes Mechanic: Lou P. master tech, Mercedes Technician replied 7 months ago

cant without the phone option, against company policy.

the wrench and miles is just saying that the service is overdue

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Mercedes Mechanic: Lou P. master tech, Mercedes Technician replied 7 months ago

ok can you upload some pictures of your fuse box?

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Mercedes Mechanic: Lou P. master tech, Mercedes Technician replied 7 months ago

if the relay is missing i wonder if that can be causing our issue as well.

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Mercedes Mechanic: Lou P. master tech, Mercedes Technician replied 7 months ago

and looking over my info i dont think i mentioned a anti theft relay.

so if you can explain that a little more i would appreciate it

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Customer reply replied 7 months ago
I know but as I was trying to figure out which relays were the ones you listed I noticed that there were a few missing. I looked at the lid where the diagram is and it says they are the rear fog light and anti theft
Customer reply replied 7 months ago
I'll send you a pic of the lid too
Customer reply replied 7 months ago
My phone won't let me upload the pic of the lid not enough memory. The car is not stolen. I'll send you the vin
Mercedes Mechanic: Lou P. master tech, Mercedes Technician replied 7 months ago

ok the fuse box picture came through.

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Mercedes Mechanic: Lou P. master tech, Mercedes Technician replied 7 months ago

ok i see something that sparks my interest.

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Mercedes Mechanic: Lou P. master tech, Mercedes Technician replied 7 months ago

the corner of the fuse box near the red wires , there is a missing relay next to the big 40 amp fuse, it looks like there is green powder around the connections on the top of the fuse box.

let me know if you see what i am talking about,

also did you remove the covers or were they already loose?

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Customer reply replied 7 months ago
They were already loose.
I'm going to check the powder situation now
Mercedes Mechanic: Lou P. master tech, Mercedes Technician replied 7 months ago
Ok someone has been messing with this . I fear i was close and thet water got into the control units
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Customer reply replied 7 months ago
I don't see any green powder :/
Customer reply replied 7 months ago
How do I get the anti theft to stop?
Mercedes Mechanic: Lou P. master tech, Mercedes Technician replied 7 months ago
Pick up the fuse box and you will see a black module box hanging off the side, i want you to unplug a few connections one at a time and see if there is green or white powder or corrosion on the terminals
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Customer reply replied 7 months ago
Okay how do I pick up the fuse box? Should it be loose?
Mercedes Mechanic: Lou P. master tech, Mercedes Technician replied 7 months ago
Ok so we are on the same page im talking about the fuse panel not the actual box that the fuse panel is in . And i can tell its loose from your picture
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Mercedes Mechanic: Lou P. master tech, Mercedes Technician replied 7 months ago
Should just pull up
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Mercedes Mechanic: Lou P. master tech, Mercedes Technician replied 7 months ago
If not just two screws in front of the panel
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Customer reply replied 7 months ago
Here I think
IMG_20171124_160822.jpgIMG_201...jpgIMG_20171124_160826.jpgIMG_201...jpgIMG_20171124_161045.jpgIMG_201...jpgIMG_20171124_161054.jpgIMG_201...jpgIMG_20171124_161244.jpgIMG_201...jpgIMG_20171124_161248.jpgIMG_201...jpgIMG_20171124_161301.jpgIMG_201...jpg
Mercedes Mechanic: Lou P. master tech, Mercedes Technician replied 7 months ago
Not sure what is happening but you just uploaded a bunch of personal pictures
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Customer reply replied 7 months ago
Also wanted to make sure you saw the part about the wrench code 23400
IMG_20171124_161302.jpgIMG_201...jpgIMG_20171124_161304.jpgIMG_201...jpgIMG_20171124_161305.jpgIMG_201...jpgIMG_20171124_161308.jpgIMG_201...jpgIMG_20171124_161309.jpgIMG_201...jpgIMG_20171124_161312.jpgIMG_201...jpg
Customer reply replied 7 months ago
Uh oh nuh uh
Customer reply replied 7 months ago
Omg I'm so embarrassed
Mercedes Mechanic: Lou P. master tech, Mercedes Technician replied 7 months ago
dogs and land and a few selfies. No worries i can have them removed
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Mercedes Mechanic: Lou P. master tech, Mercedes Technician replied 7 months ago
Not a single picture was of the car :)
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Customer reply replied 7 months ago
Nbd nothing embarrassing except me with no makeup haha here you go
Mercedes Mechanic: Lou P. master tech, Mercedes Technician replied 7 months ago
Lol, all good ;)
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Mercedes Mechanic: Lou P. master tech, Mercedes Technician replied 7 months ago
Wait a minute!!
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Mercedes Mechanic: Lou P. master tech, Mercedes Technician replied 7 months ago
Was that green circuit board exposed !!??
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Customer reply replied 7 months ago
put it back on
Mercedes Mechanic: Lou P. master tech, Mercedes Technician replied 7 months ago
Ok so did you unsnap that module from the side of the fuse box ?
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Mercedes Mechanic: Lou P. master tech, Mercedes Technician replied 7 months ago
Ok unplug a few of the connections and check for corrosion
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Mercedes Mechanic: Lou P. master tech, Mercedes Technician replied 7 months ago
Corrosion looks like green crust or white powder
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Customer reply replied 7 months ago
Okay
IMG_20171212_130705.jpgIMG_201...jpgIMG_20171212_130708.jpgIMG_201...jpgIMG_20171212_130716.jpgIMG_201...jpgIMG_20171212_130848.jpgIMG_201...jpg
Mercedes Mechanic: Lou P. master tech, Mercedes Technician replied 7 months ago
I truly feel that water got into the fuse box and thats why the car is acting up
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Customer reply replied 7 months ago
Even though the security relay is unplugged?
IMG_20171212_130705.jpgIMG_201...jpgIMG_20171212_130708.jpgIMG_201...jpgIMG_20171212_130716.jpgIMG_201...jpgIMG_20171212_130848.jpgIMG_201...jpg
Customer reply replied 7 months ago
Oh crap I accidentally requested a new mechanic!
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Disclaimer: Information in questions, answers, and other posts on this site ("Posts") comes from individual users, not JustAnswer; JustAnswer is not responsible for Posts. Posts are for general information, are not intended to substitute for informed professional advice (medical, legal, veterinary, financial, etc.), or to establish a professional-client relationship. The site and services are provided "as is" with no warranty or representations by JustAnswer regarding the qualifications of Experts. To see what credentials have been verified by a third-party service, please click on the "Verified" symbol in some Experts' profiles. JustAnswer is not intended or designed for EMERGENCY questions which should be directed immediately by telephone or in-person to qualified professionals.

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