GF07.61-P-5001R Voltage Supply of ME-SFI Control Unit, Function

GF07.61-P-5001R Voltage Supply Of ME-SFI Control Unit, Function
- up to model year 08

Component Identification:

The power supply is via the front prefuse box (F32), the rear prefuse box (F33), the passenger-side fuse and relay module (K40/4) and the rear fuse and relay module (K40/5).

Voltage supply: refer to Wiring Diagrams, Group 54.

The ME control unit features a short-circuit protection as well as a reversed polarity protection in the operating voltage section.

If all prefuses are OK, the motor electronics/chassis relay (K40/4kK) is connected to terminal 30.

If the relay has closed the power contact, power is supplied via the relay from circuit 30z via two fuses as tml. 87 engine 1 (required for engine running) and tml. 87 engine 2 (not essential for engine running) to ME control unit and engine control.

The motor electronics/chassis relay are actuated by the ME control unit on the ground side when the incoming signal "tml. 15 fused On" from EIS control unit is detected by the ME control unit.
If the ME control unit detects the signal "tml. 15 Fused Off" from the EIS control unit, the motor electronics/chassis relay continues to be actuated by ME control unit until computer power down is complete. In this way, the ME control unit determines pick-up and holding of the relay for the motor electronics/chassis relay.
Once the computer has powered down, the relay is disconnected and the ME control unit and engine control are isolated from the on-board electrical system.