AR54.10-P-1030-06I Establishing Unfused Components With Excessive Quiescent Current Consumption

AR54.10-P-1030-06I Establishing Unfused Components With Excessive Quiescent Current Consumption

Special Tools:

Commercially Available Tools:

1. Determine non-fuse protected components, they are for example:
^ Consumers of the exhaust gas recirculation (EGR) assembly
^ Consumers of the airbag assembly (AB)
^ Consumers of the anti-knock control (AKC) assembly
^ Consumers of the electronic ignition system assembly
^ Devices for protecting against breaking and entering and theft, e.g. anti-theft alarm system (ATA).
^ Consumers of the idle speed control (ISC) assembly and
^ Alternator, starter, ignition switch.

See "Wiring diagrams, models 215, 220, 230 " or STAR diagnosis. Observe run-on time for electronic components: approx. 20 minutes.

2. Read and note the value of the total standby current on the multimeter that is connected to the battery.
3. Separate coupling or connection on potential closed-circuit accessories and tie back in a manner which avoids contact if necessary.

The radio may cause quiescent-current consumption to increase by approx. 0.240 A (240 mA). By switching the radio on and off the standby current draw is raised.

On vehicles with navigation system after the navigation computer is connected an increased quiescent current of approx. 800 mA occurs for the duration of the computer run-up (approx. 20 minutes).

4. Read and note total standby current on the multimeter.
Is there a decrease in the standby current ≤ 0,020A ( 20 mA): Component is OK.
5. Connect coupling or connection to component again.
6. Repeat testing with all closed-circuit accessories as described.
If the drop in quiescent current >0.020A (20 mA):
7. Replace component. To check, re-test quiescent current.