Geely Emgrand X7. Manual part — 95

2.5.3 System operating principle

2.5.3.1 System operating Principle

When turn the key from “OFF” to “ON”, the electric anti-theft controller assembly output the
signal with the carrier frequency of 125 kHz. After passing through the EAS coil to generate the
magnetic field, the transponder gets energy and information from here to decrypt and encrypt the
information, output the magnetic field through the internal coil with the carrier frequency of 125
kHz. The EAS coil transfer the magnetic field generated by the transponder into electrical signal
and transmit this signal to the electronic anti-theft controller assembly. Electronic anti-theft
controller assembly decrypts the transponder information after reception and passes the
certification if the data match. Otherwise, the certification fails. Turn the key to start position, and
the engine ECU communicate with the electronic anti-theft controller assembly via the R and W
lines for certification. After passing the certification, the engine can start normally, otherwise, the
engine system will be locked.

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2.5.4 Component position

2.5.4.1 Part position figure

1

2

NL02-2273b

1. Engine Anti-theft System Control Module

2. Electronic

Anti-theft

Coil

380

2.5.5 Disassemble drawings

2.5.5.1 Disassembly diagram

NL02-2275b

1

2

1. Transponder

2. Remote Keyless Entry Transmitter

381

2.5.6 Electrical schematic diagram

2.5.6.1 Electrical schematic diagram

NL02-2188b

发
动
机
防
盗
控
制
模
块

电子防盗线圈

发动机控制单元

点火开关

诊断测试仪

+B

Ignition

switch

Eclectic anti-theft

coil

Engine anti-th

eft contro

l modu

le

Engine control unit

Diagnostic tester

382