Testing Quiescent Current

201 589 00 99 00 Electrical connecting set

Commercially Available Tools:

NOTE: Observe limit value of multimeter for voltage measurements. A current of approx. 20 A flows when the central locking starts operating.


NOTE: Do not activate any other consumers during the test, otherwise observe new after run time of approx. 4 minutes.


1 Connect multimeter to negative terminal and positive terminal of battery.
2 Lock vehicle and wait for approx. 4 minutes (afterrun time for electronic components).

Display <= 0.05 A (<= 0.085 A on vehicles with immobilizer) = specified value achieved:
- Carry out work step 3.

Display >= 0.05 A (>= 0.085 A on vehicles with immobilizer):
- Carry out work step 4.

3 Unlock vehicle and wait for approx. 4 minutes (afterrun time for electronic components).

Display <= 0.05 A (<= 0.085 A on vehicles with immobilizer) = specified value achieved:
- End of test.

Display >= 0.05 A (>= 0.085 A on vehicles with immobilizer):
- Carry out work step 5.

4 Unlock vehicle and wait for approx. 4 minutes (afterrun time for electronic components).

Display <= 0.05 A (<= 0.085 A on vehicles with immobilizer):
- Note displayed value. Determine circuit with higher quiescent current.

Display >= 0.05 A (>= 0.085 A on vehicles with immobilizer):
- Carry out work step 5.

5 Open trunk lid. Operate microswitch on trunk lock and wait for approx. 4 minutes (afterrun time for electronic components).

Display <= 0.05 A (<= 0.085 A on vehicles with immobilizer:
- Adjust switch (trunk illumination) on trunk lock, replace if necessary and carry out work step 2 again to check.

Display >= 0.05 A (>= 0.085 A on vehicles with immobilizer):
- Note displayed value. Determine circuit with higher quiescent current.