C. Testing coolant level indicator - ra2000601c440x(0440)

WARNING: This page does not describe the selected car, but rather 42 other vehicles, including the 1999 Mercedes-Benz S600, 1999 Mercedes-Benz S500, 1999 Mercedes-Benz S420, 1999 Mercedes-Benz S320, and 1999 Mercedes-Benz CL600. However, it is still accessible from the selected car via links, so may be relevant.

Engine 603 in Model 140

Model 140

Fig 1: Engine Oil Level Indicator, Coolant Level Indicator, Windscreen Washer Level Indicator - Wiring Diagram

Courtesy of MERCEDES-BENZ OF NORTH AMERICA.

Wiring diagram of engine oil level indicator, coolant level indicator, windscreen washer level indicator

(See Wiring diagram Volume 1, Model 140, Group 54 for further information)

TEST DATA

Resistance at coolant level sensor with "max" coolant level	∞ Ω
Resistance at coolant level sensor with "min" coolant level	approx. 15 Ω
Battery voltage	approx. 12 V

COMMERCIAL TOOL

Multimeter

e. g. SUN, DMM-5

Complaints

Indicator lamp remains on when engine running and coolant level correct.
Indicator lamp does not light up when key in position "2".
Indicator lamp does not light up when engine running and coolant level below "min".

Testing

Indicator lamp remains on when engine running and coolant level correct.

Fig 2: Diagnostic Flow Chart
Courtesy of MERCEDES-BENZ OF NORTH AMERICA.
Indicator lamp does not light up when key in position "2".

Fig 3: Diagnostic Flow Chart
Courtesy of MERCEDES-BENZ OF NORTH AMERICA.
Indicator lamp does not light up when engine running and coolant level below "min". Control function section "B" in order.

Fig 4: Diagnostic Flow Chart

Courtesy of MERCEDES-BENZ OF NORTH AMERICA.