Mercedes-Benz BENZ-VEHICLES S 500 - Manual (Page 78)

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Charge Indicator Lamp
Should the charge indicator lamp fail to
come on prior to starting when the key
is in steering lock position 2 or should
it fail to go out after starting or come
while the engine is running, this
indicates a fault which must be repaired
at an authorized Mercedes-Benz dealer
immediately.
If the charge indicator lamp comes on
while the engine is running, this may
indicate that the poly-V-belt has broken.
Should this condition occur, the poly-V-
belt must be replaced before continuing
to operate the vehicle. Otherwise, the
engine will overheat due to an
inoperative water pump which may
result in damage to the engine.
Do not continue to drive the vehicle
with the charge indicator lamp
illuminated. Doing so could result in
engine damage that is not covered by
the Mercedes-Benz Limited Warranty.
Oil Pressure Gauge with Oil
Pressure Warning Lamp
With the key in steering lock position
2, the oil pressure warning lamp comes
on and should go out when the engine
is running.
The oil pressure at idle speed may drop
if the engine is at operating temperature.
This will not jeopardize the engine's
operational reliability.
Pressure must, however, rise
immediately upon acceleration.
Note:
If the oil pressure warning lamp does
not go out after starting the engine or
comes on while driving and the oil
pressure gauge needle drops to "0",
then damage to the engine may occur
with continued operation. Turn off
engine immediately and contact an
authorized Mercedes-Benz dealer. Do
not operate the car until the condition
is repaired.
There is no need for concern should the
oil pressure warning lamp light up
briefly, (for example, in sharp turns or
hard braking) provided the lamp goes
out immediately. We recommend you
to drive to the nearest service station
where the engine oil should be topped
to the "full" mark on the dipstick with
an approved oil.