Continental Automotive Technologies 5WK47631 Immobilizer System 5WK4 7631 User Manual Func Immobiliser 2nd Gen
Continental Automotive GmbH Immobilizer System 5WK4 7631 Func Immobiliser 2nd Gen
User Manual
Siemens VDO Automotive AG SV C BC P2 RF TG
File: S:\Postzula\OPEL\Immo2Gen\Func_Immobiliser_2Gen.doc Page 1 of 3
User Manual
of the
Siemens VDO
OPEL Immobiliser
type 5WK4 7631
Siemens VDO Automotive AG SV C BC P2 RF TG
File: S:\Postzula\OPEL\Immo2Gen\Func_Immobiliser_2Gen.doc Page 2 of 3
System description of the Opel Immobilizer 2nd Generation
Redesign
The immobilizer 2nd generation prevents drive away car theft powered by its
own engine without having a valid key. It uses an inductive data transmission
between transponder (mounted inside the key) and the control unit. This data
link is working with a carrier frequency of 125 kHz and uses amplitude
modulation for transmitting data to the transponder. For the direction from the
transponder to the control unit damping modulation with pulse duration coding
is used.
Functional description
After switching on the ignition the immobilizer transmits a random number to
the transponder. It calculates a result and transmits it back to the immobilizer.
The result is checked and if it is correct, the engine will be released. After that,
the immobilizer is switched off until another start is attempted. The longest
period for transmitting 125 kHz is 3 seconds.
Typical usage pattern (for Europe only)
15 operations in 24 hours with a transmission duration of 2 seconds.
→ total transmission duration of 1.25 seconds within 1 hour
Transmitter ON 1.25 seconds / hour
Transmitter OFF 3598.75 seconds / hour
Duty Cycle: TON / T (ON+OFF) x 100% = 1.25 / 3,600 x 100 % = 0.03 %
Technical Data
Carrier frequency: 125 kHz ± 5kHz
Field strength: < 40 dBµA/m @ 10m
Type of modulation ASK
Number of channels: 1
Power supply: 12 V DC
Type of battery: car battery
Transmission range: 20 cm
Siemens VDO Automotive AG SV C BC P2 RF TG
File: S:\Postzula\OPEL\Immo2Gen\Func_Immobiliser_2Gen.doc Page 3 of 3
Block diagrams of the transmitter:
ECU
Ubat
Transponder
Antenne
Kl. 30
Kl. 31
Kl. 15
Relais
DWA
W-Leitung
Motor-
kontrolleuchte
K-Leitung
Motorsteuerung
Kl. 30
Kl. 30
510 Ohm
Tester
10 kOhm
Label design
European Community:
Siemens VDO
5WK4 7631
USA/CAN:
Siemens VDO
5WK4 7631
IC: 267T-5WK47631
FCC ID:KR55WK47631
This device complies with part 15 of
the FCC Rules and RSS-210.
Operation is subject to the following
two conditions: (1) This device may
not cause harmful interference, and
(2) this device must accept
interference received, including
interference that may cause
undesired operation.
NOTE:
Changes or modifications not expressly approved by the manufacturer could
void the user´s authority to operate the equipment.
125kHz