AR54.10-P-1030-04I Determine Circuit With Excessive Quiescent Current Consumption

AR54.10-P-1030-04I Determine Circuit With Excessive Quiescent Current Consumption

Special Tools:

Commercially Available Tools:

Component Identification:

1. Check trunk illumination, if necessary replace defective parts and close trunk lid.
2. Unclip trunk illumination, detach insulated cable lugs and measure power consumption with multimeter (measuring range in amp (s)).
After testing observe renewed run-on time of approx. 20 minutes.

Total quiescent current ≤ 0.050A achieved, end of test.
Specified value Total specified current not achieved: (Down Arrow)

3. Open fuse box in engine compartment (driver/front passenger) and fuse panel in rear (panel in rear right footwell illumination).
With measurements on the fuse box in the rear, observe that the door contact switch is operated (e.g. with adhesive tape).
4. On vehicles with code (551a) anti-theft alarm system (ATA), operate engine hood contact (e.g. with adhesive tape).
5. Open overvoltage protection cover.
6. Lock vehicle.
Observe Up-to-date Information (AI) bulletin. First of all, check circuits of the components which are listed in the Information Update.
7. Connect measurement cable (6) and test adapter (13) to a second multimeter (12) (measuring range in amp(s)).
Remove the fuse for the ELECTRONIC ALARM SYSTEM only on unlocked vehicles (alarm signal).
8. Remove the first fuse and connect the second multimeter and read the standby current after 5 seconds.

Standby current ≤ 0.020A (20 mA):
The fuse-protected circuit is in order.

9. Insert fuse again and wait for 5 seconds.
10. Check quiescent current consumption at all fuses.
After inserting the fuse or test adapter, the connected components can briefly exhibit an increased quiescent current, the radio up to 0.240 A (240 mA). By switching the radio on and off the standby current draw is raised.

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

Standby current >0.020A (20 mA):

Wait for 20 minutes, then read off again
The fused circuit is faulty: (Down Arrow)
Determine fuse-protected components with increased quiescent current consumption.
The specific value is not of the entire standby current achieved: (Down Arrow)
Determine non-fuse protected components with increased quiescent current consumption.