BMW 3 ELECTICAL SYSTEM Reparaturanleitung PDF herunterladen (Seite 12)

E90 Voltage Supply & Bus Systems

Terminal 15 Wake-up Signal Faults

The IBS recognizes wake-up line faults. The IBS can detect a wake-up line error under

the following conditions:

• DME “ON”

• Terminal 15 “ON” (voltage high at IBS)

• Terminal 15 running via BSD

If Terminal 15 at the IBS and Terminal 15 via the BSD are not equal, a fault is indicated in

the BSD line or an IBS Fault.

IBS Wake-up

The IBS constantly monitors the SoC, even when the vehicle is a sleep, a wake-up signal

is sent to the DME via the BSD if the SoC falls below the preset threshold. Upon obtain-

ing the wake-up from the IBS, the DME obtains information on the current SoC of the

battery from the IBS and requests that auxiliary electrical loads be switch off.

The IBS may only wake-up the vehicle once during a key off cycle, once awakened the

vehicle will again return to the sleep mode.

Ignition Off

No Terminal 15

DME sends data to IBS

DME in Sleep Mode

With

Auxiliary Loads

Not OK

Without

Auxiliary Loads

IBS Monitors current

drop and SoC

SoC

Load Cut-out after

16 minutes

Wake - Up

DME

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BMW 3 ELECTICAL SYSTEM Reparaturanleitung Seite 12