12 00... Information on working on ignition system

WARNING: This page does not describe the selected car, but rather 15 other vehicles, including the 2005 BMW 325xi, 2005 BMW 325i, 2005 BMW 325Ci, 2004 BMW 325xi, and 2004 BMW 325i. However, it is still accessible from the selected car via links, so may be relevant.

Safety Instructions:

Always switch off ignition before working on ignition system.

Use only test leads which have been approved and belong to the testing instruments (e.g. DIS Tester).

Comply with operating instructions of the respective testing instrument used.

Comply with the country-specific safety regulations.

Never touch components conducting current with engine running!

Comply with instructions of DIS tester.

Do not connect any suppression capacitors or inspection lamps to terminal 1 on the ignition coil.

Terminal 1 of ignition coil must not be connected to ground or battery positive lead.

If an alarm system is subsequently installed, lead of terminal 1 must not be used for start prevention.

When working on ignition system, always disconnect supply leads to ignition coils.

High Voltage! - Mortal Danger!

CAUTION: Hazardous voltages occur at:

Ignition lead.
Spark-plug connector.
Spark plug.
Ignition coil (high voltage at terminal 4 is approx. 40 kV).
Lead of terminal 1 from ignition coil to DME control unit (high voltage approx. 350 V).