Fused Components

References (WH), Commercially Available Tools:

1 Determine possible quiescent current loads connected to fuse in question. See assignment and wire connections for fuse blocks, see "Electric wiring diagrams models 163, 170, 202, 208, 210".


NOTE: See "Electric wiring diagrams, models 163, 170, 202, 208, 210" or location of components.


2 Disconnect coupling at the likely quiescent current consumer.
3 Read off quiescent current on second multimeter.


NOTE: If measured at the radio fuse or if the radio connector is separated It must be taken into consideration that the quiescent current increases by approx. 0.240 A (240 mA) when the radio is reconnected. Switching the radio on and then back off eliminates the increased quiescent current consumption.


NOTE: On vehicles with auto-pilot system (APS) the quiescent current Increases to approx. 800 mA while the processor is booting (approx. 30 minutes) after inserting the APS processor fuse. This also applies when the radio connector is disconnected and reconnected.


Quiescent current > 0.02 A (20 mA):
Quiescent current fault still present after disconnecting connector. Component is okay, reconnect connector to component checked.


4 Perform test with all the components of the faulty fuse, as described.


Quiescent current <= 0.02 A (20 mA):
Quiescent current fault eliminated after disconnecting connector from affected component. Component defective, replace:

To check measure total quiescent current again.