E 420 (210.072) V8-4.2L (119.985) (1997)
Keyless Entry Transmitter Battery: Testing and Inspection
AR80.35-P-4205E Checking Remote Control Key Batteries
Checking
Hold unlock button (1) or lock button (2) or remote trunk lid release button (3) for longer than 1 second
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The LED in the view window (4) should light up momentarily
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If not replace batteries for remote control key