Measurement of closed-circuit current: Measurement
- Select a measuring range which ensures that the pointer of the instrument is in the upper third of the scale, as far as possible. Switch over measuring range without interruption. Read off the measured value only when 30 minutes have passed since the vehicle was locked.
- Do not switch on any electrical loads during measurement. (opening the central locking system, etc.).
NOTE:
- If the value of the closed-circuit current is higher than the value determined in the table, the cause must be established systematically.
- The recommended troubleshooting procedure: with the measuring instrument connected, remove the fuse of terminal 30 and the relays one after the other.
Observe the display values of the measuring instrument when removing in order to recognize a reduction in current.
- After troubleshooting, screw the ground strap back onto the body in the proper manner.
- The measured values could vary by approx. 20%.
- The values listed in the table depend on the condition of the battery, the room temperature, and the engine temperature.
CLOSED CIRCUIT CURRENT MEASUREMENT
| M number | Designation | Closed-circuit current [mA] |
|---|---|---|
| Standard | Generator, Motronic, Instrument cluster, | 14 |
| 531 | immobilizer/ central locking, | |
| 651 | rear power window | |
| 249 Tiptronic | Tiptronic control unit (after the battery has been disconnected, terminal 15 must have been connected to the control unit at least once). | 1 |
| Cabrio | Rear power windows, convertible top control module | 3 |
| 534 | Alarm system with passenger compartment monitoring and radio remote control | 7 |
| 537 | Seat memory | 1 |
| 662 | Radio or PCM | 4 |
| 692, 490, 680 | CD changer and sound package | |
| Total | (max. 30) | |
| + 20% tolerance | (max. 6) | |
| Maximum value | (max. 36) |