Function to test malfunction indication lights and engine running detection

A1 Instrument cluster

B6/1 Camshaft Hall sensor

G2 Alternator

N3/9 CDI control unit

N3/10 ME-SFI [ME] control unit

N10/1 Front SAM control unit with fuse and relay module

CAN-B

CAN-C

A1

N10/1

G2

B6/1

N3/9

N3/10

Summary of conditions of indicator lamp tests described and engine running detection

Indicator lamp test

An indicator test is carried out with "circuit 15 ON". All the indicator lamps and warning lamps (in so far as these are present depending on the equipment variants and national versions) are actuated in this process with the exception of the following lamps:

 Left turn signal indicator lamp (A1e1)

 Right turn signal indicator lamp (A1e2)

 High beam indicator lamp (A1e3)

 Seat belt warning light (A1e9)

 Preglow indicator lamp (A1e16)

The indicator lamp test only takes place as long as the voltage which is applied to circuit 61 is < 9 V, the alternator (G2) is not operating yet and the engine speed is < 200 rpm.

If there is no fault present, the indicator lamps go out when the engine is running.

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Engine running detection circuit 61e

The instrument cluster (A1) links the Controller Area Network (data bus/CAN bus) (CAN) messages circuit 61 and engine speed to the CAN message circuit 61e engine running detection.

The signal circuit 61e is placed by the instrument cluster (A1) on the Controller Area Network bus Class C (engine compartment) (CAN-C).

The CAN message circuit 61e needed by the CDI control unit (N3/9) or by the motor electronics control unit (N3/10) and by the ESP and BAS control unit (N47-5).

The signal circuit 61e can assume the status "HIGH" or "LOW".

It is "LOW" precisely when the voltage which is applied to circuit 61 is < 9 V and the engine speed is< 200 rpm. In all other cases the signal status is "high".

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Networking

The following Controller Area Network (CAN) data are required:

 Circuit 61 (alternator check): The signal circuit 61 from the alternator (G2) is read in by the front SAM control unit with fuse and relay module (N10/1). The front SAM control unit with fuse and relay module (N10/1) then places the information "circuit 61 HIGH" (alternator operating) or "circuit 61 LOW" (alternator not operating) on the Controller Area Network bus class B (interior) (CAN-B).

 The engine speed is read in via the pulses of the crankshaft position sensor (B6/1) by the CDI control unit (N3/9) or by the motor electronics control unit (N3/10) and placed as a CAN message on the Controller Area Network bus class C (engine compartment) (CAN-C).

The instrument cluster (A1) receives these messages and evaluates them as described above.

 The same information is used for the warning message "BATTERY/ALTERNATOR - LOCATE WORKSHOP". This message appears in the multifunction display (A1p13) when "circuit 61 LOW" is present and the engine speed is
> 200 rpm.

Notice regarding the chart

The CAN message "term. 61" can have the status "high" and "low". The status depends on the actual voltage at the input of the front SAM control unit with fuse and relay module (N10/1). The status is "HIGH" when the voltage which is applied to circuit 61 rises above 9 V and it is "LOW" again when the voltage drops below 4.5 V.