Electrical 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:
Analog
• 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)
Electrical System Control Unit Cont.
• 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 – 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
Signals via CAN Cont’d
• Outside temperature
• Button – rear window heating
• Tank check value from instrument cluster
• Vehicle speed
Internal connection
• Terminal 15
• Terminal 30 (internal power supply)
Electrical System Control Unit Cont.
Bidirectional connections
• CAN Comfort high
• CAN Comfort low
Outputs Analog
• Interior light (terminal 30 G)
• Interior light, dimmable, Low Side 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
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:
Front-end control unit Cont.
The following main inputs are involved:
Analog
• 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
• Switches, front and rear fog lights
• 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
Front-end control unit Cont.
Outputs Analog
• 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
Rear control unit
The rear control unit converts various analog 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.
Gateway controller
- The gateway controller is actively involved with all CAN buses in the 911 Carrera.
- The gateway controller is a separate unit, rather than being integrated into the instrument cluster as on the Cayenne. It relays all messages and signals which are transmitted by control units for transmission via various buses. The transfer protocol of the gateway controller is defined in a so-called routing table.
- It also supports the test unit in diagnosing the vehicle by transmitting, collecting and supplying numerous items of information on the vehicle.
The individual items of information concerned here are:
• Transmission of specified installation information on all bus systems
• Provision of actual installation information (CAN control units)
• Collection and provision of error bits for tester
• Acquisition and provision of information on control units which do not switch
to sleep standby mode after terminal 15 “off”
• Acquisition and provision of general CAN bus information (e.g. single-wire
operation, fault location info, etc.)
Gateway controller operation
1 – CAN display
2 – CAN Comfort
3 – CAN diagnosis
4 – CAN drive
5 – Source network
6 – Target network
7 – Wake-up line
NOTE: Parameterization is carried out with the aid of the PIWIS tester.
The following operations and settings require to be carried out with the diagnostic tester when putting the gateway into operation in the vehicle:
• Check identification
• Encode specified installation
• Encode vehicle data (e.g. vehicle type etc.)
• Delete overflow counter (warning thresholds of an internal counter for storage overflows)
• Encode overshoot time
• Delete fault codes
Data bus system in the 2005 911 Carrera
Basic topology
A – CAN drive
B – CAN Comfort
C – CAN display
D – K-line
E – Gateway controller
Data bus system in the 2005 911 Carrera
Legend
1 – Park Assist control unit
2 – Motronic control unit
3 – Transmission control unit
4 – PSM control unit
5 – Yaw velocity/lateral acceleration sensor
6 – PASM control module
7 – Airbag control unit
8 – Electromechanical steering lock
9 – Driving authorization control unit (PAS)
10 – Steering column switch module
11 – Sliding roof control unit
12 – Rear control unit
13 – Vehicle electrical system control unit
14 – RDK control module
15 – Air conditioning control module
16 – Seat control unit
17 – Door control unit (driver’s side)
18 – Door control unit (passenger side)
19 – Front-end control unit
20 – Radiator fan control unit
21 – Bi-Xenon control unit
22 – Gateway – CAN display
23 – Gateway – CAN drive
24 – Gateway – CAN Comfort
25 – CAN diagnosis
26 – Instrument cluster
27 – Analog clock (Sport Chronometer)
28 – PCM 2.1
29 – Gateway – PCM
30 – MOST bus
31 – Amplifier
32 – Telephone module
33 – CD auto-changer
34 – Navigation module
Thank you for sharing Tony!