GF54.30-P-2014TX Indicator Lamp Test and Engine Running Detection, Function

GF54.30-P-2014TX Indicator Lamp Test And Engine Running Detection, Function

Component Identification:

Indicator lamp test
An indicator lamp test is performed via the instrument cluster at "circuit 15 ON". All available indicator and warning lamps are actuated, except:
^ Left turn signal indicator lamp (A1e1)
^ Right turn signal indicator lamp (A1e2)
^ High beam indicator lamp (A1e3)
^ Seat belt reminder light (A1e9)

The indicator lamp test occurs only for as long as the Controller Area Network (data bus/CAN bus) (CAN) message "circuit 61 < 9 V" is present at the instrument cluster.

Engine running recognition "circuit 61e"
The instrument cluster links the CAN messages "Circuit 61" and "Engine speed" to a CAN message at "Circuit 61e" (engine operation detection). This CAN message can have either a "HIGH" or "LOW" status.

It is "LOW" when the status is "Circuit 61 < 9 V" and the engine speed is below 200 rpm.
If the engine speed is > 200 rpm, the CAN message "HIGH" is sent. The signal "Circuit 61e" is placed by the instrument cluster on the Controller Area Network bus class C (engine compartment) (CAN-C) and as a result is available to the control units which need this CAN message.

Networking
The signal for circuit 61, from the alternator (alternator check), is read in by the driver-side SAM control unit with fuse and relay module. The driver-side SAM control unit with fuse and relay module then places the message "Circuit 61 HIGH" (alternator operating) or "Circuit 61 LOW" (alternator not operating) on the Controller Area Network bus class B (interior) (CAN-B).

Engine speed
The pulses from the crankshaft position sensor (engine 113) or from the crankshaft Hall sensor (engine 272, 642) are read by the ME-SFI [ME] control unit or CDI control unit (N3/9). These control units place the "Engine speed" message on the CAN-C. The instrument cluster receives these messages, evaluates them and outputs the value via the tachometer (A1p5).

The same CAN messages are used for the charge circuit warning "BATTERY/ALTERNATOR SERVICE REQUIRED." This message appears in the multifunction display (A1p13) if "Tml. 61 LOW" exists and the engine speed is greater than 200 rpm.