Hyundai Azera: Description and Operation
Fifth generation HG (2011–2024) / Hyundai Azera 2011-2024 Service Manual / Body Electrical System / Button Engine Start System / Description and Operation
Fifth generation HG (2011–2024) / Hyundai Azera 2011-2024 Service Manual / Body Electrical System / Button Engine Start System / Description and Operation
| Description |
System Overview
The System offers the following features:
| - |
Human machine interface through a 1-stage button, for terminal switching and engine start. |
| - |
Control of external relays for ACC / IGN1 / IGN2 terminal switching and STARTER, without use of mechanical ignition switch. |
| - |
Steering column locking with an ESCL device; Monitoring of the vehicle status to insure safe activation of the ESCL. |
| - |
Indication of vehicle status through LED or explicit messages on display. |
| - |
Immobilizer function by LF transponder communication between fob and start/stop button. |
| - |
Redundant architecture for high system dependability . |
| - |
Interface with Low Speed CAN vehicle communication network. |
| - |
Interface with LIN vehicle communication network depending on platform . |
The RKE and SMART KEY functions are not considered part of
this Button Engine Start system and are specified in separated system.
System Main Function
| - |
Steering column locking/unlocking with ESCL. |
| - |
Switching of ACC / IGN1 / IGN2 terminals. |
| - |
Control of the STARTER relay BAT line (high side) based on communication with EMS ECU. |
| - |
Management of the Immobilizer function. |
| - |
Management of BES warning function. |
Button Engine Start System
The Button Start System allows the driver to operate the
vehicle by simply pressing a button (called as SSB) instead of using a
standard mechanical key. It also manages the locking and the unlocking
of the steering column (called as ESCL)without any specific actions by
the driver.
If the driver press the SSB while prerequisites on brakes,
fob authentication and transmission status are satisfied, the BES System
will proceed with the locking/unlocking of the steering column, the
control of the terminal, and the cranking of the engine.
The driver can release the SSB as soon as this sequence
initiated. After positive response from immobilizer interrogation, the
system will activate the starter motor and communicate with the EMS to
check the engine running status for starter release.
The driver will be able to stop the engine by a short push on
the SSB if the vehicle is already in standstill. Emergency engine stop
will be possible by a long press of the SSB or 3 consecutive presses in
case the vehicle is in ENGINE RUNNING.
If the conditions for engine cranking are not satisfied while
a push on the SSB is detected and a valid fob authenticated, the system
will unlock the steering column and switch the terminals to IGN.
Another push on the SSB will be necessary to start the engine.
In case of a vehicle equipped with SMART KEY system, fob
authentication will not require any action from the driver. For limp
home start or in case of vehicle without SMART KEY, the driver will have
to push the start / stop button.
| • |
Control Ignition and engine ON/OFF by Sending signal to IPM. |
| • |
Display status by LED Lamp ON/OFF. (Amber or Blue) |
Indicator ON/OFF Condition At Ignition Key Off Condition
| No. | Character lamp | Conditions |
| 1 | Indicator Lamp ON | Door open, Tail lamp ON, ACC, IG ON |
| 2 | Indicator Lamp 30sec ON > Lamp OFF | Door close, Tail lamp OFF, IG OFF |
| 3 | Indicator Lamp OFF | Remote LOCK, Passive LOCK |
| 4 | Rheostat at tail lamp ON (Illumination lamp) | |
Indicator ON/OFF Condition According To Ignition Key's Position
| No. | Ignition conditions | Start Button LED status |
| 1 | IG OFF | LED OFF |
| 2 | IG ACC | Amber color LED ON |
| 3 | IG ON (Engine OFF) | Blue color LED ON |
| 4 | Cranking | Maintain LED status before cranking |
| 5 | Engine running | LED OFF |
Wireless Communication
Electromagnetic waves are used to exchange information
between the vehicle and the FOB. Two types of RKE Key can supplement the
BES system:
| - |
Non-smart key RKE |
| - |
SMART KEY FOB |
Currently the BES system comprises with SMART KEY FOB always.
The transmitter, receiver and antennas required for the
communication between the fob and the vehicle will differ depending on
functionalities and regional areas.
The RKE and SMART KEY functions are in separated documents.
Refer to Smart key system for more detailed information about SMART KEY
function.
Smart Key
The SMK manages all function related to:
| • |
"Start Stop Button (SSB) monitoring", |
| • |
"Immobilizer communication" (with Engine Management System unit for immobilizer release), |
| • |
"ESCL control", |
| • |
"Authentication server" (Validity of Transponder and in case of Smart Key option Passive Fob authentication ), |
| • |
"System consistency monitoring", |
| • |
"System diagnosis", |
| • |
Control of display message / warning buzzer . |
The unit behaves as Master role in the whole system.
In case of SMART KEY application, for example “Passive
Access”, “Passive Locking” and “Passive Authorization are
integrated for ESCL/Terminal switching Operations”.
It collects information about vehicle status from other
modules (vehicle speed, alarm status, driver door open...), read the
inputs (e.g. SSB, Lock Button and PARK position Switch), controls the
outputs (e.g. exterior and interior antennas), and communicates with
others devices via the CAN network as well as a single line interfaces.
The diagnosis and learning of the components of the BES System are also handled by the SMK.
Transponder
External Receiver(SRX)
The data transmitted by the RKE or Smart key Fob is received
by an external RF receiver called as SRX. This receiver will be same as
that one for the SMK applications, with respect to electronics, housing,
connector and software.
This receiver is connected to the SMK via a serial communication line.
Terminal And Starter Relays
Relays will be used to switch the terminals ACC / IGN1 /
IGN2. Those normally-open relays will be driven by the SMK unit and
located either in the passenger or engine compartment depending on the
vehicle architecture.
Only one relay coil is connected to the terminal outputs of the SMK unit.
Those relays should integrate a resistor connected in
parallel to the coil in order to reduce the transients during
commutation.
Start/Stop Button(SSB)
A single stage push button is used for the driver to operate the vehicle. Pressing this button allows:
| • |
To activate the power modes ‘Off’, ’Accessory’, ‘Ignition’ and 'Start' by switching the corresponding terminals |
| • |
To start the engine |
| • |
To stop the engine |
The contact will be insured by a micro-switch and a
backlighting is provided to highlight the marking of the button whenever
necessary.
Two (2) LED colors are located in the center of the button to
display of the status of the system. Another illumination LED is also
integrated into the SSB for the lighting of the "Engine Start/Stop"
characters.
Electronic Steering Column Lock (ESCL)
The ESCL is needed to lock the steering column in order to
prevent unauthorized usage of the vehicle. In order to achieve the
required safety integrity level, the ESCL is controlled and monitored by
the SMK. Such redundant architecture guarantees that the ESCL motor is
supplied only during locking/unlocking operation and that it is
disconnected from the battery and ground lines otherwise to avoid
unexpected operation while the vehicle is in motion.
Data are exchanged between the ESCL and SMK through an encrypted serial communication interface.
BES System State Chart
System STATES in LEARNT MODE
In learnt mode, the BES System can be set in 6 different
states, depending on the status of the terminals, ESCL and Engine
status:
| System State | Terminal Status | ESCL Status | Engine status |
| 1. OFF - Locked | OFF | Locked | Stopped |
| 2. OFF - Unlocked | OFF | Unlocked | Stopped |
| 3. ACC | ACC | Unlocked | Stopped |
| 4. IGN | IGN1, IGN2, ACC | Unlocked | Stopped |
| 5. Start | IGN1, Start | Unlocked | Cranking |
| 6. IGN - Engine | IGN1, IGN2, ACC | Unlocked | Running (means "self-running") |
Referring to the terminals, the system states described in
the table above are same as those one found in a system based on a
mechanical ignition switch. The one of distinction with
Mechanical-Ignition-Switch based system is that the BES system allows
specific transition from [OFF] to [START] without going through [ACC]
and [IGN] states.
System STATES IN VIRGIN MODE
The BES System can be set in 5 different states (OFF LOCKED
is not available in virgin mode), depending on the status of the
terminals, ESCL and Engine status:
| System State | Terminal Status | ESCL Status | Engine status |
| 1. OFF - UNLOCKED | OFF | Unlocked | Stopped |
| 2. ACC | ACC | Unlocked | Stopped |
| 3. IGN | IGN1, IGN2, ACC | Unlocked | Stopped |
| 4. Start | IGN1, START with special pattern of activation see Chap 6.2.1 for details | Unlocked | Cranking |
| 5. IGN - Engine | IGN1, IGN2, ACC | Unlocked | Running (means "self-running") |
Referring to the terminals, the system states described in
the table above are same as those one found in a system based on a
mechanical ignition switch. The one of distinction with
Mechanical-Ignition-Switch based system is that the BES system allows
specific transition from [OFF] to [START] without going through [ACC]
and [IGN] states.
Schematic Diagrams
Circuit Diagram
...
Start/Stop Button Components and Components Location
Component
...
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