Power Distribution Module: Description and Operation
Multifunctional control units
9710 Elec. system control unit
The vehicle electrical system control unit converts various analogue signals from the functional groups
- exterior lights
- front/rear lid opener
- rear window release
into digital CAN messages and outputs them on the CAN bus. At the same time, the vehicle electrical system provides the switching outputs for the functional groups
- Interior light
- Filler flap lock/unlock
- Heated rear screen
- Heated seats
- Chassis wake-up
- Front wiper/washer system
- Headlamp cleaning system.
either in part or in their entirety. As functions of relevance to the customer are controlled and activated via the vehicle electrical system control unit, a large number of input data are required on this unit. The following main inputs are involved here:
Analogue
- Automatic lights (coming home lighting)
- Fog light
- Rear fog light
- Reversing light
- Terminal 30
- Electronic ignition lock (terminal 15)
- Terminal 15 redundant
- Ground
- Ground 2 (terminal 31 redundant)
- Terminal 50 (if not via CAN)
- Button - front lid opener
- Button - rear lid opener
- Button - rear window release
- Button - rear spoiler (voltage-encoded input)
- Button - Sport (voltage-encoded input)
- Rain sensor, line 1
- Rain sensor, line 2
- Rain sensor, line 3
Signals via CAN
- Terminal 50
- Key contact (terminal 86S)
- Driver's door open/closed
- Front passenger door open/closed
- Driver's door locked/unlocked
- Front passenger door locked/unlocked
- Interior light afterglow
- Dimming value, orientation light
- Sun intensity
- Status, anti-theft alarm system
- Filler flap locked
- Filler flap unlocked
- Status, button for left seat heating
- Status, button for right seat heating
- Interior temperature
- Status, rear spoiler function
- Button - flick wiping
- Switch - intermittent wiping
- Switch - wiper level 1
- Switch - wiper level 2
- Button - washing
- Step switch - interval sensitivity
- Headlight washer system
- Dipped beam
- Outside temperature
- Button - rear window heating
- Tank check value from instrument cluster
- Vehicle speed
Internal connection
- Terminal 15
- Terminal 30 (internal power supply)
Bidirectional connections
- CAN Comfort high
- CAN Comfort low
Outputs
Analogue
- Interior light (terminal 30 G)
- Interior light, dimmable, LowSide switch
- Orientation light (dimmable)
- Drive motor, filler flap lock
- Heated rear screen
- Seat heating, left
- Seat heating, right
- Function light, rear spoiler button
- Function light, Sport button
- Wake-up signal, chassis
- Wiper motor, level 1
- Wiper motor, level 2
- Washer pump
- Headlight washer system pump
Signals via CAN
- Status - automatic lights switch
- Status - fog light switch
- Status - rear fog light switch
- Status - reversing light switch
- Status - central locking button
- Status - front lid opener button
- Status - rear lid opener button
- Status - rear window release button
- Functional check, left seat heating
- Functional check, right seat heating
- Rear window heating
- Status - tank check on instrument cluster
Diagnosis
The diagnosis interface is provided on the diagnosis plug via a diagnosis CAN bus and provides the PIWIS tester with access to control unit data and functions. All input signals on the control unit can be read out and all actuating elements can be operated via the interface. Any stored faults can also be read out and deleted. Vehicle-specific parametric data can be encoded via the Porsche tester.
Some functional features of the vehicle electrical system are restricted or disabled in production and transportation mode.
97 Front-end control unit
The front-end control unit converts various analogue signals from the functional groups
- Exterior lights with direction indicator functions
- Outside temperature detection
- Front lid monitoring
into digital CAN messages and outputs them on the CAN bus.
At the same time, the front-end system provides some or all of the switching outputs for the functional groups
- Exterior lights (front)
- Fanfare horn
- Luggage compartment lighting (front)
- Indicator lights
- Luggage compartment release (front)
- Safety catch release
- Automatic headlight beam level adjustment
- Fan output stage.
either in part or in their entirety. As functions of relevance to the customer are controlled and activated via the front-end control unit, a large number of input data are required here.
The following main inputs are involved here:
Analogue
- Switch, marker light
- Driving lights (dipped/high beam)
- Button, hazard warning lights
- Power supply
- Front lid switch
- Outside temperature sensor
- Emergency release inside luggage compartment
- Sensor system, axle sensors (front/rear)
- Wheel speed
Signals via CAN
- Parking light on (left/right)
- Switch, automatic lights
- Switch, front fog light
- Switch, rear fog light
- High beam switch
- Headlight flasher button
- Direction indicators (left/right)
- Crash intensity
- Hazard warning lights
- Driver feedback, automatic coming home function
- Door open (left/right)
- Sun intensity
- Afterglow time, automatic coming home function
- Daytime running lights active
- Engine running
- "Engine" message failure
- Terminal 50
- Terminal 86S
- Horn button
- Load switch-off
- Vehicle reference speed
- "Brake" message failure
- Button - front lid opener
- Remote control for front lid opener
- Radiator fan control
Internal connection
- Terminal 15
- Terminal 30 (internal power supply)
Bidirectional connections
- CAN Comfort high
- CAN Comfort low
Outputs
Analogue
- Indicator light - hazard warning lights
- Side direction indicators/side marker lights
- Direction indicators (front/rear)
- Side lights (front)
- High beam
- Dipped beam
- LED - direction indicators (front)
- Fog light
- Fanfare horn
- Luggage compartment light
- Luggage compartment release/catch
- Radiator fan output stage
- Stepping motors for automatic headlight beam level adjustment
- Safety catch release
Signals via CAN
- Switch - parking light
- Switch - dipped beam
- Left/right marker lights
- Activation of instrument and location lighting
- Status - dipped beam
- Status - high beam
- Hazard warning lights button
- Bulb failure
- Left/right direction indicators on
- Daytime driving lights off
- Status - front lid
- Status - PWM signal for left radiator fan (PWM - pulse width-modulated)
- Status - PWM signal for right radiator fan (PWM - pulse width-modulated)
- Outside temperature, unfiltered
- Automatic headlight beam level adjustment defective
Diagnosis
As for the vehicle electrical system control unit, diagnosis is carried out via the diagnosis CAN bus at the diagnosis plug.
Some functional features of the vehicle electrical system are restricted or disabled in production and transportation mode.
NOTE: See page 6 - Vehicle electrical system control unit.
When terminal 15 is OFF, the actuator test (actuator only - not the diagnosis) is aborted, i.e. the actuator is restored to its original state.
97 Rear control unit
The rear control unit converts various analogue signals from the functional groups
- Tray/glove compartment lock
- Rear lid lock
- Spoiler control
- Interior sensor system
- Inclination sensor system
into digital signals and outputs them on the CAN bus.
At the same time, the rear control unit provides some or all of the switching outputs for the functional groups
- Hazard warning lights
- Sliding/tilting roof control
- Spoiler control
- Rear lights.
either in part or in their entirety.
Diagnosis
As for the vehicle electrical system control unit, diagnosis is carried out via the diagnosis CAN bus at the diagnosis plug.
Some functional features of the vehicle electrical system are restricted or disabled in production and transportation mode.
NOTE: See page 9.5 - Vehicle electrical system control unit.
