GF80.57-P-4102-03I Electronic Ignition/Starter Switch Control Module, Purpose

GF80.57-P-4102-03I Electronic Ignition/starter Switch Control Module, Purpose

Purpose
The electronic ignition/starter switch control module (EIS) acts as the communication point between the passenger compartment bus (CAN B), the electronic engine control (ME-SFI) and the electronic transmission control (ETC).

Actuating electric suction fan
The electric suction-type fan is controlled infinitely by the electronic engine control (MF-SFI) (hardware signal to fan control module). The cooling version is stored in the EIS electronic ignition/starter switch control module. The signal flow is identical on both versions.

The AC pushbutton control module calculates the nominal fan speed depending on the refrigerant pressure and transmits the request to the electronic engine control (ME-SFI) via the electronic ignition/starter switch (EIS) control module.In the AC mode at an outdoor temperature of 15 degrees C and a vehicle speed of 70 km/h a basic ventilation of 40% is requested.

The electronic engine control (ME-SFI) calculates the nominal fan speed depending on the engine temperature and compares this speed with the request from the AC pushbutton control module.The higher of the two values is output by the hardware as a PWM signal.

Switch-on characteristics for AC
The AC can be switched on in two different ways:
- with circuit 15 ON (ignition)
- when residual engine heat utilization is activated (REST button [REST]) pressed, LED illuminated)

Since some of the connected air conditioning equipment consumers represent a heavy load on the vehicle electrical system (e.g. blower) a corresponding message is sent to the CAN B bus from the electronic engine control via the electronic ignition/starter switch control module (EIS) control module when the starter is actuated. As long as the starter operates the corresponding output stages (blower, hot water circulation pump, engine fan, AC compressor) are switched off by the AC pushbutton control module.

A fixed program is set on in the residual engine heat utilization mode

For example a set blower control voltage is output to avoid an excessively high load on the battery. The nominal temperatures can be varied.

Specific version coding for the automatic air conditioning is possible via the diagnosis assistance system (DAS). The following possibilities are available:

- Refrigerant fill level control
- INACTIVE
- ACTIVE

- Pollutant-dependent recirculated air circuit
- INACTIVE
- ACTIVE (with activated charcoal filter) STANDARD
- ACTIVE (without activated charcoal filter ACTIVE (with activated charcoal filter)

- Convenience locking (tunnel shift) (only on model 220)
- INACTIVE
- ACTIVE

- Beam indicator for blower in automatic mode
- Display
- Do not indicate

- REHEAT mode
- icing protection
- Standard

- 100% recirculated air possible
- YES
- NO

- Display: Night design
- Automatic
- Night design

- Display: Day design
- Automatic
- Day design

- Automatic basic adjustment for rear air conditioning (only on model 220)
- ACTIVE
- INACTIVE

- Main air flap with AC switched off
- CLOSED
- OPEN

- Suction fan control
- Remaining engines
- M 137, OM 613, OM 628

- National version for AC
- Remaining world
- Hot countries

The pushbutton control module reads these version codings in after ignition ON via the CAN bus.

The following parameters can be changed in the EIS control module in addition.
- Country versions
- Left-hand steering
- Right-hand steering
- Engine model designation
- Vehicle models
- Stationary heater or Telestart
- PRESENT
- NOT PRESENT

- Rear air conditioning (only model 220)
- PRESENT
- NOT PRESENT