imadison

I have a GL 450 with an ISM issue, Itried to start the vehicle, but it wouldn't start as it displayed on the multi-function display that I should remove key and later displayed that the vehicle is not in PARK. It indicated "P" position which made it all the more confusing. I checked with a diagnostic tool and it said that it shut-down due to a defect on component A80 (Intelligent Servo Motor). This fault does not make the vehicle start. What is the ISM and where is it located?

reddog

Could it be the "Intelligent Servo Module" located at the rear of the transmission case?

alx

this. ism is intelligent servo module (a80). about $500 for the part. code is 1922 (shut down due to ism a80)

imadison

Yes, its the intelligent servo module (A80), code 1922. How do I get a new order?

alx

huh? bring it to the dealer or buy it from parts.com and bring it to your indy.

kingscarnotmech

the intelligent servo module (A80) fault? Instrument cluster display "Drive to workshop without selecting gear". also with continuos beeping sound. I changed to a new ISM into the vehicle GL 450 Mercedes truck but vehicle start and return back to the same performance as above with continuous beeping sound and other displays on the Instrument cluster with sometime no crank from the engine.

imadison

Did you change with a new ISM and was it programmed after the change? Because I changed mine and it was initialised with a diagnostic tool and it is ok now. I hope this solves your problem.

Gani

I have a C240/2005 model that is recently giving me serious headache. Sometimes if I park the car, it didn't start till I open the bonnet and it cools off, for like 5 - 10 minutes before it will start. It so embrassing that I don't want to be driving the car sometimes.

alx

Wrong forum. And if you car cranks but doesn't catch it is most like a crank position sensor. When they start to go bad they first quit when engine is hot/ heat soaked.

abtabor6

ISM must be programmed by Mercedes shop. Most indy Mercedes shops can't program the ISM, ISM is considered to be an anti left device and Mercedes won't let other work on them unless you have a locksmith license.

Khadari7

I don't have the ISM issue, but my 2008 GL450 still wont crank even though everything has power. After changing the two batteries, I still get all the dash lights as if it wants to start but there's no sound from the starter. Not even a click. I checked all fuses, used the iCARSOFT MBII scanner, reset the fault codes and ran the diagnostic a total of three times. Even though my key fob works fine for EVERYTHING else, I bought another one with the EIS and the ECU from the same vehicle. The gateway has no signs of burns or shorts and I'm ready to install the replacement parts. Anything else I should know?

TX07GL450

Anything else you should know? maybe how to start a new thread.
How about directly touching starter with battery voltage to confirm if it is working?

Sorani Sorani

Check the starter fuse possible short somewhere.

Billmiranda

Luckily,.. I bought the extended CPO warrantee because i just had this issue yesterday. I managed to get home but this morning had issues with it not wanting to shift out of park. I have a higher end Autel scanner and saw that I have steering issues,.. parking system issues... Motronic issues... safety system issues... but when I go through and check all the warnings and codes,.. they all cascade back to the ISM. Going into the dealer tomorrow morning and hopefully... it'll be done by monday. As it's a CPO claim,.. "they" have to diagnose it (of course) but they can get the part in Saturday. I was going in anyway as the rear air suspension is sagging a little on one side and even after I leveled it using my Autel,.. it still gives me that little car with the up arrow symbol. Now to see if they'll claim it's not a warrantee issue... sigh. This site has me terrified 90% of the time, lol.

progonat

My ISM module went bad. I was able to find a shop that coded a used ISM to work with my car. They had to wipe the existing data and code my vin.

Here is some excellent information that describes this issue.

https://www.youcanic.com/wiki/merced...t-servo-module

konigstiger

Deleted.

GelandewagenNub

I'm looking for a place who virginizes and preprograms the vin into the ism so i can buy a new one, anyone have any leads on a place that provides this service?