Airbag control unit with part number A1648209726

What does the airbag control unit A1648209726 do?

The airbag control unit A1648209726 is the central control of the restraint system (SRS) for Mercedes-Benz. It evaluates the crash sensors, determines in an impact which airbags and seatbelt pretensioners are triggered, and monitors the entire system. After an accident it stores crash data and locks itself.

The manufacturer number Bosch 0285001998 is also printed on the housing. The system reports faults via the airbag warning light in the instrument cluster, so that the driver is informed.

Why does the control unit A1648209726 fail?

The most common cause is crash data stored after an accident, even if no airbag has deployed; a normal diagnostic tool cannot erase it. Further causes are ageing electronic components, cold solder joints, moisture and corrosion at plug connections and voltage spikes. Airbag24 erases the crash data during the repair.

Crash data is created as soon as the unit registers an event, and it stays stored even when the vehicle drives normally again afterwards.

Ageing components, cold solder joints and corrosion at plug connections can only be reliably identified by an examination of the unit. Voltage spikes, for example from a weak battery or jump-starting, can also harm the electronics. Which cause applies is shown only by reading the fault memory together with the examination.

How can you tell that the A1648209726 is defective?

The airbag warning light in the instrument cluster stays on constantly or comes on intermittently, and an error message appears in the instrument cluster. The diagnostic tool gets no connection to the control unit, and the fault memory cannot be cleared. In an emergency, airbags and seatbelt pretensioners may then fail to trigger.

• Airbag warning light in the instrument cluster stays on constantly or comes on intermittently
• Error message in the instrument cluster
• no connection from the diagnostic tool to the control unit
• Fault memory cannot be cleared

Remember under which circumstances the light comes on, and write down the wording of the message.

Which vehicles is the A1648209726 fitted in?

The control unit A1648209726 is fitted in these vehicles: Mercedes-Benz ML-Class W164 SUV (2005-2011); Mercedes-Benz GL-Class X164 SUV (2006-2012).

The overview shows which vehicles are recorded for this part number.

• Mercedes-Benz ML-Class W164 SUV (2005-2011)
• Mercedes-Benz GL-Class X164 SUV (2006-2012)

Comparing the part number on the label of the removed unit with this page only confirms that you have the right unit. Have the fault memory read out beforehand, because only the log shows whether the control unit is defective or whether a plug or cable is the cause.

For the same vehicles, we also repair control units with the part numbers 1648209826, 285001535, 285001993, A 164 820 57 85, A1648204326, A1648204426.

How does the repair of the A1648209726 work?

Processing at Airbag24 for checking, repair and function test usually takes 3–4 working days. Before removal, have the fault memory read out and attach the log; then disconnect the battery.

The control unit is removed afterwards, then you create a repair order online and pack the unit well before sending it in.

Airbag24 checks the unit on the test bench, replaces defective components, clears the crash data and carries out a function test. Afterwards your own unit is sent back to you. Our repairs come with 2 years' statutory liability for defects. The repaired control unit comes back with all vehicle data and is ready for use as soon as it is refitted — no coding or programming is required.

How does the control unit A1648209726 get to Airbag24?

You send the unit in as a parcel or book a UPS collection for an extra charge. After the repair Airbag24 returns it to you by UPS.

Put the printed repair order into the parcel and pack the unit shock-proof.