Circuits

Determine Circuit With Increased Quiescent Current Consumption










References (WH), Commercially available tools.







1 Check trunk or cargo space illumination, replace defective parts, if applicable.


NOTE: Unclip trunk lamp, disconnect insulated cable terminal and measure power consumption with multimeter (amps DC mode). After testing observe shut-off delay of approx. 4 min.
Total quiescent current <= 0.05 A or <= 0.085 A (vehicles with immobilizer) reached, end of test.


Specified total quiescent current exceeded:

2 Open fuse box F1, F4 and cover on light module (N7-1) (model 210).
3 On vehicles with ATA lock engine hood lock with screwdriver.
4 Lock vehicle.
5 Open cover on overvoltage protector.


NOTE:
Observe information UPDATE!
First check component circuits listed in information update.


6 Remove fuse for component affected.


NOTE: Remove fuse for ATA only with vehicle unlocked (alarm signal).

7 Connect test cable (6) and test adapter (13) to second multimeter (12) (amps DC mode).
8 Remove first fuse, connect second multimeter in its place and read off quiescent current after 5 sec.

Quiescent current <= 0.02A (20 mA):
Fused circuit okay.

9 Reinstall fuse, wait 5 seconds.
Then measure quiescent current consumption on all fuses according to test step 8.


NOTE: After installing the fuse or test adapter the connected components may have an increased quiescent current for a short time, for the radio this may be as high as 0.240 A (240 mA). The increased quiescent current consumption can be eliminated by switching the radio on and back off.

Quiescent current > 0.02A (20 mA):
The fused circuit is defective:

Determine fused components in which quiescent current is too high.

If the nominal value for the quiescent current is still too high:
Determine unfused components for which quiescent current consumption is too high.