Mercedes-Benz E 320 Wagon 1999 ASR - Manual (Page 41)

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Change batteries (7), inserting new
ones under contact spring (8) with plus
(+) side facing up.
Return battery compartment into
housing until locked in place
Important!
Batteries contain materials that can
harm the environment if disposed of
improperly. Recycling of batteries is
the preferred method of disposal. For
disposal, please follow manufacturer's
recommendation on battery package.
Replacement battery:
Lithium, type CR 2025 or equivalent.
Synchronizing Remote Control
The remote control may have to be
resynchronized, if the vehicle cannot
be locked or unlocked.
To synchronize insert electronic key in
steering lock.
The remote control should once again
be operational.