General Instructions / Safety Measures
- Never disconnect or connect wiring harness plugs from/to a control unit or an other electronic component with ignition switched on.
- Never disconnect the battery from the vehicle electrical system while the engine is running.
- Never start the engine without the battery properly connected.
- Before charging or quick-charging, disconnect the battery from the vehicle electrical system.
- Never use the battery quick-charger for starting.
- Before welding on the vehicle, disconnect battery and remove control units.
- With temperatures greater than 80 �C (176 �F) (i.e. paint oven) remove control units.
- Use only high-resistance voltage testers for checking.
- For test steps in which connection contacts of wiring harness plugs or control units are to be connected to ground or battery voltage (+12V), proceed with utmost care and concentration. An incorrectly selected contact can lead to destruction of internal circuits in the control units in question.
- After reconnecting the battery, volatile memories must be reprogrammed. With radio coding and station programming, inform the customer about the decoding and deleted station memories.
- If the engine or the automatic transmission have been removed, ensure that all ground connections have correctly connected after installation. If the engine is started despite a loose ground connection, this can cause damage to or destruction of the control unit.