Keyless Go, function (MODEL 204.0/2, 204.3, 204.9) - GF80.61-P-0005CE
MODEL 204.0/2 with CODE (889) KEYLESS-GO as of model year 2009/YoM 08
MODEL 204.3 with CODE (889) KEYLESS-GO.
MODEL 204.9
Vehicles up to 30.11.09
Vehicles as of 3.12.09 up to 31.5.10
Vehicles as of 1.6.10
KEYLESS-GO (KG), general
With the convenience function it is possible to lock/unlock, start and shut off the vehicle without key, without inserting the transmitter key into the electronic ignition lock control unit. It is sufficient to just carry the transmitter key
Operation of the central locking (CL) via the transmitter key remains possible parallel to the Keyless Go functions.
The anti-theft alarm system (ATA) (with code (551) Anti-theft alarm system (ATA)) functions in the same manner as when locking/unlocking the CL with the transmitter key.
The KEYLESS-GO control unit transmits coded queries to determine the location of the transmitter key. The transmitter key decodes the queries and transmits corresponding coded responses, unless it is located in areas A, B, C or D.
The KEYLESS-GO control unit receives the responses from the transmitter key via the TV 2 and KEYLESS-GO antenna amplifier (model 204.0/3/9) or KEYLESS GO antenna amplifier (model 204.2) and evaluates them. If the evaluation is positive, the KEYLESS-GO control unit authorizes the transmitter key.
The KG system comprises the following partial functions:
- Function sequence for position definition of transmitter key
- Function sequence for locking/unlocking:
- Function sequence for engine start/stop
Function sequence for position definition of transmitter key
To reliably or securely realize the locking/unlocking and engine start/stop function, it is necessary to determine the position of and authorize the transmitter key.
The following diagrams show the components with the KEYLESS-GO control unit determines in which area around the vehicle or in the vehicle the transmitter is located.
If the vehicle is loaded with unusual material (high volumes of metal) the long wave frequencies emitted by the antennas for the KEYLESS-GO control unit are reflected or absorbed to a high degree, which can lead to erroneous detection. The maximum overlap between the detected inner and outer area (measured at sides, windshield and rear window) is approx. s = 10 cm. This means the transmitter key is located definitely inside or outside the vehicle above s = 10 cm. Below 10 cm (gray zone) position recognition of the transmitter key can be faulty. In everyday situations this ensures that the driver can fill the fuel tank and that child sitting on the inside cannot start the engine as long as the driver has the transmitter key with him.
Model 204.0/2/9
Additional function requirements for locking/unlocking
- Transmitter key located outside of vehicle (max. approx. distance to one of the control elements s = 1 m)
- Circuit 15C OFF
The electronic ignition lock control unit transmits the circuit status circuit 15 via the interior CAN.
Function sequence for locking/unlocking:
The locking/unlocking function allows the vehicle to be opened and closed with the CL.
The following control elements are available:
- To lock and unlock:
Left front KEYLESS GO door handle
Right front KEYLESS GO door handle
- Left rear door KEYLESS GO door handle (on model 204.0/2/9)
- Right rear KEYLESS GO door handle (on model 204.0/2/9)
- To unlock:
- Trunk lid external operation switch (model 204.0/3)
- Liftgate external operation switch (model 204.2/9)
The sensor units in the KEYLESS-GO door handles are switched off when circuit 15 is switched on. Activation takes place when circuit 15 is switched off and then a door is opened.
The locking/unlocking function comprises the following subfunctions:
- Function sequence for preadjustment of unlocking mode
- Function sequence for locking/unlocking one vehicle door
- Function sequence for visual locking feedback
- Function sequence for acoustic locking feedback (as of 1.6.10)
- Function sequence for unlocking trunk lid (model 204.0/3) or liftgate (model 204.2/9)
Function sequence for preadjustment of unlocking mode
Basically the following types of unlocking are differentiated:
- Global unlocking:
The entire vehicle can be unlocked by gripping and pulling a KEYLESS GO door handle.
- Selective unlocking (only possible on driver door):
Only the driver door and the fuel filler flap are unlocked by gripping and pulling the left front KEYLESS GO door handle.
Simultaneously pressing the lock/unlock buttons on the transmitter key for t = 5 s, switches the system between two types of unlocking. The LED on the transmitter key comes on twice to confirm this change.
Function sequence for locking/unlocking one vehicle door
Unlocking possibilities:
- Engaging any KEYLESS-GO door handle
- Engaging and pulling any KEYLESS-GO door handle
Locking possibilities:
- Touching outside of KEYLESS GO door handle or
- actuating convenience sensor on KEYLESS GO door handle
Function sequence for unlocking left front door globally:
When the left front KEYLESS-GO is held, the capacitive sensor in the door handle recognizes this.
The KEYLESS-GO control unit reads in the signal from the capacitive sensor and transmits a wake-up signal to the transmitter key via the left rear door KEYLESS GO antenna (model 204.0/2/9) or left door KEYLESS GO antenna (model 204.3).
The transmitter key transmits its access authorization code and position via the TV 2 and KEYLESS-GO antenna amplifier (model 204.0/3/9) or KEYLESS GO antenna amplifier (model 204.2) to the KEYLESS-GO control unit. The KEYLESS GO control unit transmits the access authorization code to the electronic ignition lock control unit via interior CAN.
If the access authorization code is valid, the electronic ignition lock control unit transmits the command "Unlock CL" to the following control units:
- Front SAM control unit (up to 30.11.09)
- Rear SAM control unit
- Left front door control unit
- Right front door control unit
- Left rear door control unit (on model 204.0/2/9 as of 3.12.09)
- Right rear door control unit (on model 204.0/2/9 as of 3.12.09)
They then unlocking the following components:
- Left front door lock
- Right front door lock
- Left rear door lock (on model 204.0/2/9)
- Right rear door lock (on model 204.0/2/9)
- Trunk lid central locking motor (model 204.0/3) or liftgate central locking motor (model 204.2/9)
- Tank cap central locking motor
The external operation switch is enabled to unlock the trunk lid or the liftgate by the rear SAM control unit. If the KEYLESS-GO door handle is pulled within t = 0.5 s after opening the CL, the Hall sensor senses this in the left front KEYLESS-GO door handle. DAS
The KEYLESS-GO control unit reads in the signals from the Hall sensors in the left front KEYLESS-GO door handle and actuates the left front door opening assist motor (A85m2) on vehicles up to 2.12.09. The rotary tumbler in the left front door control lock is unlocked and the door opens.
Function sequence for visual locking feedback
After successful locking or unlocking the CL, a visual locking feedback takes place via the following components:
- Left turn signal indicator lamp (A1e1) and right turn signal indicator lamp (A1e2) (function feedback)
- Left front turn signal lamp (E1e5)
- Right front turn signal lights (E2e5)
- Left rear turn signal lights (E3e1)
- Right rear turn signal lights (E4e1)
- Left outside mirror turn signal lamp (E6/5)
- Right outside mirror turn signal lamp (E6/6)
The function is controlled by the SAM front control unit, transmitting the corresponding flasher frequency as blinkmaster via the interior CAN:
Number of visual signals:
- Locking: three times
- Unlocking: once
If a door or the liftgate is still open on model 204.2/9, there is no visual locking feedback.
Detailed information on turn signal light actuation is described in the document "Turn signal light actuation function".
Function sequence for acoustic locking feedback (as of 1.6.10)
The acoustic locking feedback can be selected and activated in the IC via the left multifunction steering wheel button group.
The instrument cluster reads in the control signals for the left multifunction steering wheel button group via the following path:
- Left multifunction steering wheel button group
- Direct line
- Steering wheel electronics
- Steering LIN
- Steering column module control unit
- Chassis CAN
The instrument cluster transmits the status of the acoustic locking feedback via the body CAN to the front SAM control unit. When the acoustic locking feedback function is activated, the horns are actuated momentarily after successful locking or unlocking. With a valid transmitter key and activated acoustic locking feedback the electronic ignition lock control unit transmits the command "Lock or unlock" via the body CAN to the front SAM control unit. As a result of this the front SAM control unit actuates the horns briefly via the horns relay.
Number of acoustic signals:
- Locking: three times
- Unlocking: once
If a door or the liftgate is still open on model 204.2/9, there is no acoustic locking feedback.
On vehicles up to 31.5.10 with code (494) USA version, the acoustic locking feedback via the horns replaces the acoustic locking feedback via the alarm siren (H3/1).
Function sequence for unlocking trunk lid (model 204.0/3) or liftgate (model 204.2/9)
The rear SAM control units directly reads in the status of the trunk lid external operation switch and transmits it to the KEYLESS-GO control unit via the interior CAN. The KEYLESS-GO control unit then actuates the trunk KEYLESS-GO antenna, which transmits a wakeup signal to the transmitter key.
The transmitter key transmits its access authorization code and position via the TV 2 and KEYLESS-GO antenna amplifier (model 204.0/3/9) or KEYLESS GO antenna amplifier (model 204.2) to the KEYLESS-GO control unit. The KEYLESS GO control unit transmits the access authorization code to the electronic ignition lock control unit via interior CAN.
If the access authorization code is valid, the electronic ignition switch control unit transmits the command "Unlock trunk lid or liftgate" to the rear SAM control unit.
The rear SAM control unit then actuates the rotary tumbler in the trunk lid central locking motor (model 204.0/3) or liftgate central locking motor (model 204.2/9) and unlocks the trunk lid or the liftgate.
Additional function requirements for engine start/stop
- The transmitter key is located in the vehicle interior
- KEYLESS-GO start/stop button inserted in electronic ignition lock control unit
Function sequence for engine start/stop
The function engine start/stop enables to engine to be started and switched off via the KEYLESS-GO start/stop button.
The engine start/stop function comprises the following subfunctions:
- Function sequence for interrogation of transmitter key
D Function sequence for starting engine
D Display of fault messages function sequence
D Function sequence for circuit switching
D Function sequence for shutting off engine
Function sequence for interrogation of transmitter key
The KEYLESS-GO control unit starts the check for an authorized transmitter key under the following conditions:
- During start-up (v > 0 km/h)
- After closing the last door if a door was previously opened when the vehicle is standing still and the engine is running.
The trunk lid and the liftgate are evaluated as door.
If during the interrogation of the transmitter key no transmitter key is detected in the vehicle interior, the IC issues the message "Key not detected" in red text. In this case it is possible to switch off the engine, however, it cannot be started.
Additional function requirements for starting engine
- Selector lever in position "P" or "N"
- Foot brake actuated
Function sequence for starting engine
The engine start function is activated by pressing the KEYLESS-GO start/stop button.
The electronic ignition lock control unit senses this request and transmits the status "Start/stop button pressed" to the KEYLESS-GO control unit via the interior CAN. The KEYLESS-GO control unit evaluates this and transmits a wake up and location finding signal to the transmitter key via the KEYLESS-GO antennas.
The transmitter key transmits its access authorization code and position via the TV 2 and KEYLESS-GO antenna amplifier (model 204.0/3/9) or KEYLESS GO antenna amplifier (model 204.2) to the KEYLESS-GO control unit. The KEYLESS GO control unit transmits the access authorization code to the electronic ignition lock control unit via interior CAN.
If the access authorization code is valid, the electronic ignition lock control unit transmits the circuit status 50 ON to the CDI control unit or ME-SFI control unit via the chassis-CAN and the engine is started.
The electronic selector lever module control unit transmits the current selector lever position to the electronic ignition lock control unit via the drive CAN, CDI control unit or ME-SFI control unit. The status of the service brake is sensed by the brake light switch (S9/1) The brake light switch is supplied using circuit 15 by the front SAM control unit.
When the service brake is being operated, the voltage that is present is switched through to the Electronic Stability Program control unit. The electronic stability program control unit transmits the status of the service brake to the electronic ignition lock control unit via the chassis CAN.
Display of fault messages function sequence
If the transmitter key is not recognized in the interior compartment when an attempt is made to start, the message "Key not recognized" (A1p7) (model 204.0/2/3 (except 204.077/277/375), model 204.9 without code (442) Comfort multifunction steering wheel) or in the multifunction display (A1p13) (with code (442) Comfort multifunction steering wheel, model 204.077/277/375) appears in the instrument cluster. The start attempt is interrupted. The status of the circuit remains unchanged.
If, during a start attempt, the selector lever is in position "P" or "N", a chime sounds. A corresponding note is indicated in the travel distance or multifunction display.
Function sequence for circuit switching
If the foot brake is not depressed when the KEYLESS GO start/stop button is actuated, only circuit 15R is switched on. Repeated actuation of the KEYLESS-GO start/stop button activates circuit 15. Actuating again, switches off circuit 15R and circuit 15. If the driver door is closed, circuit 15C remains switched on for t = 30 min.
Function sequence for shutting off engine
When the KEYLESS-GO start/stop button is pressed when the engine is running, an engine shutoff request is output. The electronic ignition lock control unit senses when the KEYLESS-GO start/stop button is pressed and transmits the status "Start/stop button pressed" to the KEYLESS-GO control unit via the interior CAN. The KEYLESS-GO control unit evaluates it and transmits the request to switch off via the interior CAN to the electronic ignition lock control unit, which passes on the request via the chassis CAN to the CDI control unit or to the ME-SFI control unit.
The CDI control unit or ME-SFI control unit then shuts off the engine depending on the vehicle speed.
Switching off engine depending on vehicle speed:
- Speed below v = 3 km/h: Engine switched off immediately.
- Speed above v = 3 km/h: Engine is switched off after pressing KEYLESS-GO start/stop button for t > 3 s.
The instrument cluster transmits the vehicle speed information to the KEYLESS-GO control unit via the interior CAN.
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| Function schematic for electric KEYLESS-GO engine start/stop | PE80.61-P-2052-97FAB | ||
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