A1644460610 / A2C53163028 – ISM Electronic Module for 722.9 Transmission Mercedes ML W164 and R W251
The offered ISM (Intelligent Servo Module) gearbox controller with part numbers A1644460610 and A2C53163028 has been fully prepared for reinstallation. The unit is clean, factory-reset and ready for programming using the original Mercedes Star Diagnosis tool.
The ISM module supports the 7-speed automatic transmission 722.9 Direct-Select and is used in a wide range of Mercedes-Benz models:
- ML-Class W164 (2005–2011) – V6 3.0 l, 3.5 l and V8: 4.0 l, 4.6 l, 5.0 l, 5.5 l, 6.3 l
- R-Class W251 (2005–2011) – same engine variants as ML
- S-Class W221 (2005–2011) – L4 2.2 l, and V6/V8 up to 5.5 l
The module has been tested and is fully functional. It is ready for reinstallation without additional configuration — it only needs to be paired with the vehicle according to Mercedes procedures.
Q&A – Frequently Asked Questions about ISM A1644460610 / A2C53163028
Is the ISM module ready for installation?
Yes. The unit has been factory-reset and is fully prepared for adaptation in the vehicle via Star Diagnosis.
Does this ISM fit only the 722.9 transmission?
Yes. This module works exclusively with the 7-speed 722.9 Direct-Select automatic transmission used in many Mercedes-Benz models.
Which cars does this module fit?
It is used in Mercedes ML W164, R-Class W251 and S-Class W221 from 2005–2011, depending on engine version.
Does the module require programming?
Yes, pairing and personalisation must be performed using Mercedes Star Diagnosis or Xentry.
Is the module tested?
Yes. Each unit undergoes full functional testing and communication verification before sale.
Can I install it myself?
Physical installation is simple, but adaptation requires professional diagnostic equipment.
Can the module be returned?
Yes, standard return policy applies.
Can a faulty ISM prevent the vehicle from starting?
Yes. The ISM controls the Direct-Select lever position, so a failure can block gear selection or prevent the vehicle from starting.
