Operation CHARM: Car repair manuals for everyone.

Adjusting DIP Switches

When this alarm is installed in a 3 Series Convertible or a Z3 Roadster, the alarm's sensitivity to noise is increased as a result of less insulation from external noise (due to the fabric top). The Glass Breakage Sensitivity Switches can be reset to "low" or "super low" (depending on the severity of noisy environmental factors) if false alarms are experienced in a specific environment in a particular vehicle.

Sensitivity can be set to one of four levels as follows:

Sensitivity Switch 1 Switch 2

High Off Off
Mid On Off
Low Off On
Super Low On On

The following are the recommended sensitivity settings:

Model Sensitivity

Z3 Roadster Mid
Convertible Mid
318ti High
318/328, (2- and 4-door) High