Hyundai Venue: Immobilizer System / Description and operation
The immobilizer system will disable the vehicle unless the proper ignition key
is used, in addition to the currently available anti-theft systems such as car
alarms, the immobilizer system aims to drastically reduce the rate of auto theft.
1. |
Transponder (TP) – IMMO ECU Communication

TP Read Protocol
(1) |
IMMO_ECU after IGN on(or CPU Reset cancellation) is sent Challenge
to TP and confirmed Serial Number and Signature.
|
(2) |
When response of input transponder is not correct, input is
retry.
|
(3) |
When response of input transponder is correct, The data that
calculate Encryption operation in the EEPROM program compared
with received data from TP.
When Codes is same, input is finished.
If the codes are not same, input are continued until when codes
are same.
|
(4) |
If IMMO_ECU EEPROM code is not programming, when correct transponder
is inputted (CRC Check OK), input is finished.
|
(5) |
After IGN1 on(CPU Reset cancellation), IMMO_ECU is reading the
maximum 5times Transponder Code
|
|
PCM (Power Train Control Module)
1. |
The PCM(ECM) (A) carries out a check of the ignition key using a special
encryption algorithm, which is programmed into the transponder as well
as the PCM(ECM) simultaneously. Only if the results are equal, the engine
can be started. The data of all transponders, which are valid for the
vehicle, are stored in the PCM(ECM).
ERN (Encrypted Randorm Number) value between EMS and encrypted immobilizer
unit is checked and the validity of coded key is decided by EMS.

|
Immobilizer Unit (IBU)
The IMMOBILIZER carries out communication with the built-in transponder in the
ignition key. This wireless communication runs on RF (Radio frequency of 125
kHz). The IMMOBILIZER is mounted behind of the crash pad close to center cross
bar.
The RF signal from the transponder, received by the antenna coil, is converted
into messages for serial communication by the IMMOBILIZER device. And, the received
messages from the PCM(ECM) are converted into an RF signal, which is transmitted
to the transponder by the antenna.
The IMMOBILIZER does not carry out the validity check of the transponder or
the calculation of encryption algorithm. This device is only an advanced interface,
which converts the RF data flow of the transponder into serial communication
to the PCM(ECM) and vice versa.

TRANSPONDER (Built-in keys)
The transponder has an advanced encryption algorithm. During the key teaching
procedure, the transponder will be programmed with vehicle specific data. The
vehicle specific data are written into the transponder memory. The write procedure
is once only; therefore, the contents of the transponder can never be modified
or changed.
Antenna Coil
The antenna coil (A) has the following functions.
– |
The antenna coil supplies energy to the transponder.
|
– |
The antenna coil receives signal from the transponder.
|
– |
The antenna coil sends transponder signal to the IMMOBILIZER.
It is located directly in front of the steering handle lock.
|

Inspection
The following section describes how to diagnose faults using a diagnostic instrument.
1.
Connect the cable of GDS to the data link connector in driver side crash
pad lower panel, and turn on the GDS...
Other information:
This type of seat belt combines the features of both an emergency locking retractor
seat belt and an automatic locking retractor seat belt. Convertible retractor type
seat belts are installed in the rear seat positions to help accommodate the installation
of child restraint systems...
Trouble Symptom Charts
Trouble Symptom 1
Trouble Symptom 2
Trouble symptom
Probable cause
Remedy
The set vehicle speed varies greatly upward or downward
"Surging" (repeated alternating acceleration and deceleration) occurs after
setting
Malfunction of the vehicle speed sensor circuit
Repair the vehicle speed sensor system, or replace the part
Malfunction of ECM
Check input and output signals at ECM
Trouble Symptom 3
Trouble symptom
Probable cause
Remedy
The CC system is not canceled when the brake pedal is depressed
Damaged or disconnected wiring of the brake pedal switch
Repair the harness or replace the brake pedal switch
Malfunction of the ECM signals
Check input and output signals at ECM
Trouble Symptom 4
Trouble symptom
Probable cause
Remedy
The CC system is not canceled when the shift lever is moved to the "N" position
(It is canceled, however, when the brake pedal is depressed)
Damaged or disconnected wiring of inhibitor switch input circuit
Repair the harness or repair or replace the inhibitor switch
Improper adjustment of inhibitor switch
Malfunction of the ECM signals
Check input and output signals at ECM
Trouble Symptom 5
Trouble symptom
Probable cause
Remedy
Cannot decelerate (coast) by using the "SET/–" switch
Temporary damaged or disconnected wiring of "SET/–" switch input circuit
Repair the harness or replace the "SET/–" switch
Malfunction of the ECM signals
Check input and output signals at ECM
Trouble Symptom 6
Trouble symptom
Probable cause
Remedy
Cannot accelerate or resume speed by using the "RES/+" switch
Damaged or disconnected wiring, or short circuit, or "RES/+" switch input
circuit
Repair the harness or replace the "RES/+" switch
Malfunction of the ECM signals
Check input and output signals at ECM
Trouble Symptom 7
Trouble symptom
Probable cause
Remedy
CC system can be set while driving at a vehicle speed of less than 40km/h
(25mph), or there is no automatic cancellation at that speed
Malfunction of the vehicle-speed sensor circuit
Repair the vehicle speed sensor system, or replace the part
Malfunction of the ECM signals
Check input and output signals at ECM
Trouble Symptom 8
Trouble symptom
Probable cause
Remedy
The cruise main switch indicator lamp does not illuminate (But CC system
is normal)
Damaged or disconnected bulb of cruise main switch indicator lamp
Repair the harness or replace the part...