Safety Warning
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Hybrid System Activation, Basic Function - GF08.30-P-1008A
Model all (CAR)
with code ME05 (Hybrid drive 85 kW-94 kW variant (incl. plug-in))
Model all (CAR)
with code ME08 (Hybrid drive 75-84 kW VARIANT (INCLUDING PLUGIN))
Model all (CAR)
with code ME10 (Hybrid vehicle)
Overview
This document contains information on:
- General
- Function requirements
- Activation of hybrid system
General
The activation function in the powertrain control unit requests the precharging of the high-voltage intermediate circuit and the switching on of the contactor. Next, it assesses the status of the contactor and reports the system readiness.
Function requirements
- Circuit 15 ON
- No crash signal in this ignition cycle
- Active and trouble-free CAN bus connections to all high-voltage components
- High voltage security checked and released (no crash in interlock circuit error, no insulation fault)
Activation of hybrid system
The activation function checks the following requirements:
- Engine clutch, status
- High-voltage battery voltage
- Temperature of high-voltage battery
- Status of electrical machine
- Contactor status
When circuit 15 is switched on, the activation function in the powertrain control unit requests the precharging of the capacitors in the high-voltage intermediate circuit. After precharging is complete and the appropriate feedback, it requests that the contactor be switched on.
The battery management system control unit reports in the status signal that the contactor has been switched on. If the status signal fails, the activation function sets the status of the contactor internally to a substitute value.
After successful activation of the high voltage on-board electrical system, the powertrain control unit sets the status of the hybrid drive system to "operational."
The powertrain control unit transmits this status to the instrument cluster control unit, which displays a corresponding message in the instrument cluster.
| Function schematics | |||
| Function schematic for hybrid system activation | Model 167 with code ME05 (Hybrid drive 85 kW-94 kW variant (incl. plug-in)) Model 213 as of model year 2021 with code ME05 (Hybrid drive 85 kW-94 kW variant (incl. plug-in)) Model 213 as of model year 2021 with code ME08 (Hybrid drive 75-84 kW VARIANT (INCLUDING PLUGIN)) | PE08.30-P-2500-97A | |
| Model 177, 247 with code ME08 (Hybrid drive 75-84 kW VARIANT (INCLUDING PLUGIN)) | PE08.30-P-2500-97B | ||
| Model 206 with code ME10 (Hybrid vehicle) Model 223 with engine 256 with code ME10 (Hybrid vehicle) | PE08.30-P-2500-97C | ||
| Control units | |||
| Power electronics control unit, basic function | GF08.20-P-9891A | ||
| Powertrain control unit, basic function | GF54.21-P-9894A |
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.