Description
Mercedes ISM Programming Service / Virgin / Reset / Unlocking – Intelligent Servo Module (FBS3)
Is your Mercedes Benz displaying an error message “Drive to the workshop without changing gear”? Then you have a faulty ISM.
Other symptoms include car not shifting gears between P, R, N, or D.
The Intelligent Servo Module’s (ISM) main purpose is to enable the system to read the selected drive position via electrical signals and to engage the drive position via a mechanical interface on the transmission. The Mercedes ISM system is located on the driver’s side on the transmission housing.
This service is suitable if you have any of the symptoms listed below:
- The vehicle hardly starts.
- The vehicle’s gear won’t shift.
- Revs at high rpm.
- The cluster light goes off.
- The vehicle won’t crank due to loss of communication from the Transmission Control Module.
- Error data from the actuator motor in the component A80 of the Intelligent Servo Module (ISM)
- Car shakes badly in idle.
Common fault codes are:
- 1904 The internal mechanism in component A80 for engaging select or lever position P is not in the correct position.
- 1974 Selector lever position P was engaged due to a fault occurring in component A80 (intelligent servo module for DIRECT SELECT) or in the vehicle communications
- 1922 System shut down due to an internal fault
- 1994 Component A80 (Intelligent Servo Module for Direct Select) is defective
Information that we need:
- Part number of your unit
- Short description of the problem
- Diagnostic report or diagnostic error/trouble codes with transcriptions of the errors
According to your diagnostic error/trouble codes, we will decide where and what the problem is and advise how to proceed.
How does this service work?
You will need to send us your replacement ISM, and we will unlock the used module where it can be programmed to your vehicle using dealer level programmer or diagnostic tools such as Autel 908 / Launch Pro – under the Adaptation menu.
If you are experiencing any of the above-listed issues with your car, contact us and see how we can help.