Testing quiescent current consumption - ra540c1401030x(1030)

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.

C. Determining fused components with increased quiescent current consumption Model 140

Preliminary work:

Testing battery charge state.

All assemblies and components in vehicle operating properly.

Operation no. of operation texts and work units or standard texts and flat rates:

C. Determining fused components with increased quiescent current consumption

Preliminary work:

Total quiescent current consumption tested (A).

Circuit with increased quiescent current consumption determined (B).

Test cable (6) and test adapter	connect to second multimeter.
Multimeter	switch on (Mode: Amps).
Possible quiescent current consumers connected to fuse in question	determine according to chart in fuse box or wiring diagram file "Electric wiring diagrams, passenger cars" and disconnect connector.

Quiescent current	read off on second multimeter.
	Quiescent current >0.02 A (20 mA): Component okay, reconnect connector to component checked. Perform test in same manner on all possible components in circuit in question. NOTE: When measuring at the fuse carrier for the radio or when the connector for the radio is disconnected, the quiescent current consumption can increase by approx. 0.240 A (240 mA).
	This high quiescent current consumption can be eliminated by switching the radio on and off again.
	If the fuse carrier for the auto pilot system (APS) is measured or the APS connector disconnected, the quiescent current increases by approx. 600 mA, a waiting time of approx. 30 minutes must then be observed.
	Quiescent current ≤ 0.02 A (20 mA): Replace component.

Total quiescent current on multimeter (2) connected to battery	check again.
	Readout ≤ 0.05 A (50 mA ) or ≤ 0.085 A (85 mA) on vehicles with immobilizer End of test. On vehicles with anti-theft warning system unlock engine hood lock on right.
	Readout >0.05 A (50 mA) or >0.085 A (85 mA) on vehicles with immobilizer Continue to check quiescent current consumption on next fuses not yet tested (B).