S000003179 Mercedes Trunk Gate Control Module A1648203185 | Fits W164 W251 X164

🔧 Description & Function

This is the power liftgate control unit (also called control module, controller, or control unit) responsible for the automatic opening and closing of the rear tailgate. It manages motor operation, pin wiring, and safety interlocks.
Built with a 7-pin female connector, supports up to 164 A load.
Electronically programmable—may require dealer-level coding to integrate with your specific vehicle setup.

✅ Compatible Vehicles

Specifically designed for Mercedes vehicles with power liftgate and matching part number:

2006–2009 ML‑Class (W164): ML 320, ML 350, ML 500, ML 550, ML 63 AMG
2006–2009 R‑Class (W251): R 320, R 350, R 500, R 550, R 63 AMG
2007–2009 GL‑Class (X164): GL 320, GL 350, GL 450, GL 550
May also fit later years (2010–2011) on R, ML, GL as per overlapping part numbers:
- A164 820 48 26, A164 820 49 26, A164 870 11 26 etc.
- Important: Confirm physical connector type and part number match (A164 820 31 85, A164 820 48 26, 49 26, 87 011 26) before purchasing. Programming/coding may be needed.

Confirm part number compatibility: ensure module part matches any of the interchange numbers above.
Connector inspection: verify the 7‑pin connector and mounting style matches your vehicle’s existing module.
Plan for programming: budget time/funds for coding after installation (dealer or qualified shop).

Feature	Details
Part Number	A164 820 31 85 (plus interchange 48 26,49 26,87 011 26)
Fitment	2006–2009 ML/W164, R/W251, 2007–2009 GL/X164 (power liftgate models)
Connector	7‑pin female, 164 A max
Condition	Used/OEM; inspect for corrosion or damage before purchase
Additional Needs	On‑car programming required

Specifically designed for Mercedes vehicles with power liftgate and matching part number:

2006–2009 ML‑Class (W164): ML 320, ML 350, ML 500, ML 550, ML 63 AMG
2006–2009 R‑Class (W251): R 320, R 350, R 500, R 550, R 63 AMG
2007–2009 GL‑Class (X164): GL 320, GL 350, GL 450, GL 550
May also fit later years (2010–2011) on R, ML, GL as per overlapping part numbers:
- A164 820 48 26, A164 820 49 26, A164 870 11 26 etc.
- Important: Confirm physical connector type and part number match (A164 820 31 85, A164 820 48 26, 49 26, 87 011 26) before purchasing. Programming/coding may be needed.

Send us your VIN and we confirm fitment before shipping. See our shipping policy and return policy.