BMW 3 ELECTICAL SYSTEM Reparaturanleitung PDF herunterladen (Seite 8)

E90 Voltage Supply & Bus Systems

Intelligent Battery Sensor (IBS)

The Intelligent Battery Sensor (IBS) as a mechanical/electronic device which is connected

directly to the negative battery terminal.

The IBS contains a micro processor that is used to monitor/measure various battery con-

ditions such as:

• Terminal voltage via measurement from B+ to Gnd

• Charge/discharge current via integrated shunt resistor

• Temperature of battery acid via integrated temp sensor

Index Explanation

Battery Ground Lead

B+ Connection for IBS

Bit Serial Data Interface (BSD)

Intelligent Battery Sensor (IBS)

Index Explanation

B+

B-

Battery Voltage Measurement

Battery Temp Measurement

Current Measurement

Microprocessor

BSD

DME/ECM

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BMW 3 ELECTICAL SYSTEM Reparaturanleitung Seite 8