Establishing unfused components with excessive quiescent current consumption - AR54.10-P-1030-06AB

Fig 1: Identifying Electrical Connection Set (201 589 00 99 00)

1. Establish unfused components. These are, for example:

   Consumers of exhaust gas recirculation (EGR) assembly.

   Consumers of airbag (AB) assembly.

   Consumers of knock sensor system (KSS) assembly.

   Consumers of electronic ignition system (HFM/PMS/EIS) assembly.

   Break-in warning and anti-theft systems, e.g. ETW and immobilizer.

   Consumers of idle speed control (ISC) assembly and generator, starter, ignition switch assembly.

See "Wiring diagrams, model 163, 170, 202, 208, 210" or Diagnosis Manual.

Model 129: See wiring diagram binder "Wiring diagrams for passenger vehicles"

Observe after-run time for electronic components:

Model 129, 202, 208, 210 approx. 4 min., Model 170 approx.

10 min. Model 163: 5 min. if engine temperature is < 100°C,

10 min. if engine temperature is > 100°C.

2. Read off total quiescent current on multimeter connected to battery. Note down value.
3. Disconnect coupler and connectors from any quiescent-current consumers, and tie back so that they cannot be inadvertently touched.

   The radio may cause quiescent-current consumption to increase by approx. 0.240 A (240 mA).

   The increase in quiescent-current consumption can be rectified by switching the radio on and off.

   In the case of vehicles with auto-pilot system (APS), an increase in quiescent-current consumption of approx. 800 mA occurs after the APS computer is connected and persists for the time taken for the computer to run-up (approx. 30 min.).

4. Read off total quiescent current from multimeter and note down. If the drop in quiescent current is 0.02A (20mA,) or ≥ 0.035 A (35 mA,) for the immobilizer control module: Component is OK.
5. Reconnect coupler or connector to component.
6. Repeat test on all quiescent current consumers as described above.

If the drop in quiescent current is >0.02 A (20 mA) or >0.035 A (35 mA) for the immobilizer control module:

Replace component.

To check, re-test quiescent current.