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W168 (1997-2004)
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  • Ignition Key and Remote Control — Replacing Batteries

Ignition Key and Remote Control — Replacing Batteries (Mercedes-Benz A-Class W168)

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1. Use coin 1 to pry up cover 2 on the remote control that covers the battery compartment and remove it (see illustration).

1. Use coin 1 to pry up cover 2 on the remote control that covers the battery compartment and…


2. Remove both batteries 1 by prying them up with a screwdriver (see illustration).

2. Remove both batteries 1 by prying them up with a screwdriver (see illustration).


3. Install new batteries into the remote control compartment with the positive pole facing up. The polarity is indicated on the body of each battery.

4. Close the battery compartment lid, pressing down on the batteries to secure them in place.

Attention! Each time you press a button on the remote control, the control lamp on the remote control should flash. If the remote control does not work after replacing the batteries, it must be synchronized. After synchronization, the control lamp should light up.




Remote control synchronization



If the car cannot be locked or unlocked using the remote control, first check the batteries in the remote control.

If they are normal and the control light comes on when you press the button, then the remote control needs to be synchronized.

5. Point the remote control at the car and press the door lock or unlock button twice. After that, no later than 30 seconds later, insert the key into the lock and turn on the ignition. The remote control is ready for use again.
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A-Class W168 / Equipment and devices
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Checking the relay
Switches — Checking for Current Flow
Troubleshooting electrical equipment
Additional electrical equipment — installation
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Sound signal — removal and installation
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W168 (1997-2004) 
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