Great Wall Florid. Manual — part 47

GWFLORID Maintenance Manual

186

Immobilizer System

Immobilizer system composition

This vehicle's engine immobilizer system consists of a theft deterrent ECU assembly, a theft deterrent coil as-

sembly, and two theft deterrent converter assemblies. The theft deterrent coil assembly is put on the head of

ignition lock cylinder, with the other end connected to the theft deterrent ECU assembly. The two theft deterrent

converter assemblies are separately installed inside the plastic handles of the two keys.

1. Position diagram

All the components of immobilizer system are assembled on the overall vehicle except for the theft deterrent

converter assemblies inside the keys. They achieve communication functions via the wire harness connections.

The following figure shows the position of each component in the overall vehicle.

Theft deterrent controller

Ignition lock key

Theft deterrent coil

Steering column

2. Theft deterrent controller

The theft deterrent controller assembly mainly consists of a microprocessor and peripheral components. It com-

municates with the password transmitter assembly and engine ECU. The theft deterrent controller assembly

communicates with the engine ECU via the W wire, while communicating with the theft deterrent transponder

assembly via radio frequency. The theft deterrent controller connects with the scanner via the K wire. Through

the scanner, it can initiate matching, state controlling, and malfunction diagnostic on the immobilizer system.

3. Theft deterrent coil

The theft deterrent coil assembly is installed on the ignition lock cylinder, the other end of wire harness

plug is connected to the theft deterrent controller assembly. The theft deterrent coil assembly can generate

an electromagnetic field to achieve communication between the theft deterrent controller assembly and the

password transmitter assembly.

4. Transponder

The theft deterrent transponder is installed inside the key handle. It has no power supply, maintains a small size,

and long use life. It acquires electric energy and transmission signals using the stimulation of the electromagnetic

field generated by the theft deterrent coil, so as to communicate with the theft deterrent controller assembly.

187

Electrical Accessories

Diagnostic

scanner

Engine ECU

Battery

+

-

Ignition switch

LED

620 Ω

LED

ON

ANTA

GND

ANTB

Battery

Ground

W wire

R wire

K wire

A4

A3

A1
A2

A8

A5

A7

B3

B2

B1

Coil

6. Theft deterrent controller's connecting plug

The theft deterrent controller has two connecting plugs: an 8-core A plug and a 3-core B plug.

Pin

Pin definition

B1

Coil terminal A

B2

Coil terminal B

B3

GND

Theft deterrent controller

8-core A plug

Coil 3-core B plug pin definition

7. Immobilizer system matching

System matching is defined as a composition of independent immobilizer system components: The theft deter-

rent controller assembly, theft deterrent transponder, theft deterrent coil assembly, and engine ECU are com-

bined into a immobilizer control system through relevant downline matching equipment or scanners.The engine

can only start up when the well matched immobilizer system works normally.

Engine immobilizer system fault diagnostic and troubleshooting

Immobilizer system failure will lead to the engine ECU being blocked and the engine unable to start up. It does

Pin

Pin definition

Rated working

voltage

Working

current

A1 Connected battery

positive pole

12 V

<200 mA

A2 Ground

0 V

<200 mA

A3 Connected LED

12 V

<50 mA

A4 Connected ON end

12 V

<50 mA

A5 Connected R wire

12 V

<200 mA

A6 No connection
A7 Connected K wire

12 V

<200 mA

A8 Connected W wire

12 V

<200 mA

Note: Do not connect the A3 pin if the vehicle does not

have a theft deterrent indicator lamp

5. Immobilizer system wire connection diagram

GWFLORID Maintenance Manual

188

not necessarily mean that engine start failure is due to a immobilizer system malfunction. The reasons for start-

ing engine failures are numerous, including factors like fuel, gas, fire, electricity, wires, etc. If the engine cannot

start, first check if the immobilizer system is working normally. This can be judged by looking at the flashing

theft deterrent indicator lamp which is located on the dashboard in front of the driver seat: Insert the key into the

lock cylinder and turn it to the "ON" position. If a legal key is used to start the engine, once the warning lamp is

connected to the ON end and the transponder is confirmed, the LED will remain unlit. Then when the ON end is

disconnected and the key is pulled out, the LED will shine for 0.25 s and darken for 4 s, as to act as a warning.

If an illegal key is used to start up the engine or there is something wrong with the system, the alarm indicator

lamp will shine for 0.25 s and darken for 4 s. If all is normal, then check the other parts of the engine. If abnor-

mal, first perform immobilizer system troubleshooting. A scanner can be used to judge if the immobilizer system

is working normally, but the precondition is that the scanner must be able to establish communication with the

theft deterrent controller.

1. If communication cannot be established, consider the following:

(a) Check whether the battery voltage is higher than 9 V

(b) Check whether the scanner plug is well contacted to the vehicle socket

(c) Use a multimeter to check whether the 7 pin of the OBD-II plug (diagnostic plug) is connected to the theft

deterrent controller's A7 pin

(d) Check whether the power supply of the theft deterrent controller is normal. (Use a multimeter to measure

whether the voltage of the theft deterrent controller's socket A1 pin and A2 pin is higher than 9 V)

(e) Then adopt the substitution method, which is to replace the theft deterrent controller to check if there is

anything wrong with the theft deterrent controller.

• If the failure is related to the theft deterrent controller, change it and initiate re-matching.

• If the failure has nothing to do with the theft deterrent controller, remove the electronic controller which

is connected to the alarm's K wire, such as the ABS controller, engine electrojet controller, airbag ECU

assembly, etc., as to ascertain if the present fault is caused by the wire harness connected with the theft

deterrent controller's K wire.

2. If communication can be established

Connect the scanner to the vehicle diagnostic port. Insert the key into the steering lock, and turn it to the "ON"

position, then select the scanner to check the immobilizer system's trouble code.

3. Security system troubleshooting

Investigate the problem and perform troubleshooting according to the trouble code on the scanner:

Trouble

code

Code

significance

Failure cause

Troubleshooting methods

B1000

Theft deterrent

controller

internal

malfunction

Theft deterrent coil open

circuit or short circuit. Theft

deterrent controller internal

malfunction.

Check whether the theft deterrent coil's connecting plug and

1.

the theft deterrent controller is well connected.

Check whether the theft deterrent coil's wire harness plug is sliding

2.

or touching each other.

Remove the theft deterrent coil plug, and then use a

3.

multimeter to check the resistance between the B1 and B2

pins. The normal resistance is about 5-30 Ω. If the resistance

is close to zero, that means the coil has been short circuited.

If the resistance is infinite, then it means the coil's circuit is

open. Measure the resistance between pins B1 and B3, and

B2 and B3, normally they are infinite. If the resistance gains

a certain value, then it means the coil is short circuited or

leaking electricity.

If there is nothing wrong with the coil, the next step is to

4.

check the theft deterrent controller. Adopt the substitution

approach, replace it with a non-matched new theft deterrent

controller or an theft deterrent controller which has been

reset (please refer to the immobilizer system component

replacement). Insert the key into the ignition lock and turn it

to the "ON" position and read the trouble code. If there is no

9000 failure, it means the replaced controller has an internal

malfunction, and the new replaced controller must be re-

matched.

189

Electrical Accessories

Trouble

code

Code

significance

Failure cause

Troubleshooting methods

B3040

W wire failure,

communication

There is no response from

the electrojet controller after

the theft deterrent controller

sends out communication

requests.

First check whether the two failures B043 and B0422

1.

coexist. If so, first solve these two problems.

Check whether the 8-core plug of the theft deterrent

2.

controller is well connected. Check whether the wire harness

connecting the A8 pin (N wire) of the 8-core plug and

electrojet is well connected, not short circuited, and has no

poor contact. Check whether the electrojet wire harness and

the connector is well connected.

Replace the alarm (please refer to the immobilizer system

3.

component replacement). Check whether the above failures

exist. If they do not, the fault most likely exists in the alarm.

Replace the electrojet (please refer to immobilizer system

4.

component replacement). Check whether the above failures

exist. If they do not, the fault most likely exists in the

electrojet.

B3042

W wire

grounding

Short circuiting happens

between the W wire and the

ground

Check whether the theft deterrent controller's 8-core plug

1.

wire harness is touching each other.

Check whether the wire harness which connects the 8-core

2.

plug's A8 pin (W wire) and the electrojet is short circuited to

the ground.

Replace the alarm (please refer to immobilizer system

3.

component replacement). Check whether the above failures

exist. If they do not, the fault most likely exists in the alarm

Replace the electrojet (please refer to immobilizer system

4.

component replacement). Check whether the above failures

exist. If they do not, the fault most likely exists in the

electrojet.

B3043

W wire and

power is short

circuited

Short circuiting happens

between the W wire (A8

pin) and the battery positive.

Check whether the theft deterrent controller's 8-core plug

1.

wire harness is touching each other.

Check whether the wire harness which connects the 8-core

2.

plug's A8 pin (W wire) and the electrojet battery positive has

short circuited

Replace the alarm (please refer to immobilizer system

3.

component replacement). Check whether the above failures

exist. If they do not, the fault most likely exists in the alarm

Replace the electrojet (please refer to immobilizer system

4.

component replacement). Check whether the above failures

exist. If they do not, the fault most likely exists in the

electrojet.

B3045

(vehicles

without

the theft

deterrent

indicator

lamp will

show this

trouble

code, but

it will

not affect

immobilizer

system

validation.)

LED has a

short circuit or

open circuit,

LED operates

abnormally

The wire harness (A3

pin) connected to the theft

deterrent indicator (LED)

has short circuited to the

ground. The wire harness

(A3 pin) connected to

the immobilizer indicator

(LED) has an open circuit.

Check whether the theft deterrent controller's 8-core plug

1.

wire harness is touching each other.

Check whether the wire harness which connects the 8-core

2.

plug's A3 pin and the immobilizer indicator has short

circuited to the ground.

Check whether the wire harness which connects the 8-core

3.

plug's A3 pin and the immobilizer indicator has an open

circuit.