S 500 Coupe (140.070) V8-5.0L (119.980) (1997)
Test cable (6) and test adapter
connect to second multimeter.
Multimeter
switch on (Mode: Amps).
Faulty fuse (from test step 1)
remove.
Multimeter
connect in place of fuse and read off quiescent current after waiting 5 seconds.
Quiescent current <= 0.02 A (20 mA):
-
Fused circuit okay.
-
Reinsert fuse, wait 5 seconds and then check all other fuses according to test step 1.
NOTE: After inserting a fuse the quiescent current for the connected components may be higher briefly. For the radio this may be as much as
0.240 A (240 mA).
This high quiescent current consumption can be eliminated by switching the radio on and off again.
NOTE: After inserting the fuses for the auto pilot system (APS) 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):
-
Determine fused components whose quiescent current consumption is too high, See: Testing and Inspection/Determining Source of Increased
Quiescent Current/Fused Components
Fused Components
Preliminary work:
Total quiescent current consumption tested, See: Testing and Inspection/Testing Quiescent Current Consumption/Testing Quiescent Current
Consumption
Circuit with increased quiescent current consumption determined, See: Testing and Inspection/Determining Source of Increased Quiescent
Current/Circuits
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 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.
NOTE: 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.