Chery Fora (Elara A520). Manual — part 191

①Rear window galvanothermy wire time control
②Rear trunk lock motor
③Rear trunk illumination lamp
④Reverse radar system
⑤Vehicle outside rear lamp （brakelamp、fog lamp、reverse lamp 、license

plate lamp and so on）

⑥The

left、right door window lifter motor

⑦Data transfer with front ISU

rear

The parts that controlled by the rear ISU have the following functions:

The Advanced reverse warning system is setted into The A5 , it is composed of

the following parts:

Figure15-3 Reverse Radar System Circuit

Figure15-2 Rear ISU Configuration

Radar Module

Right

Probe

Middle

Probe

Left

Probe

1

5

13

16

POWER

CLK DATA

GND

7
8

15

V/W
Lg/B
G

Y

L/W

Gr

A4

A19

Rear ISU

Y

L/W

B15

Gr

（1）Rear ISU

To 31st line

（2）Reverse radar system

Rear ground/
Rear fuse/E

Rear ISU fuse

（1）Reverse warning control unit
（2）Reverse warning R/L sensor

（5）Rear ISU computer
（6）Reverse switch
The 1st pin of the reverse warning control unit is the power supply pin, it connects the B15

pin of rear ISU; the 5th pin is

it connects to the A4 pin of rear ISU; the 13th pin is

The reverse warning system start to self-check when the ignition switch is turned on, if the

If the control unit finds trouble in the system during the self-check procedure, the buzzer will

generate a 5s continuous sound. When put into the reverse gear, and if the vehicle is 1.5m away from the
roadblock, the buzzer will start to warning. The sound frequency will increase with the shorten of the
distance. And when there is only 25mm, the buzzer will

continuous sound.

（3）Reverse warning m id sensor
（4）Reverse warning R/R sensor

CLK，

DAT， it

connects to the A19 pin of rear ISU;the 16th pin is GND； th e 7th pin connect to the reverse
warning R/L sensor; the 8th pin is connectted to the reverse warning mid sensor;the 15th pin is
connectted to the reverse warning R/R sensor.

ignition switch is not turned off, the reverse warning system will keep in active state, but the
distance control fuction could only be started when the vehicle is put into gear. When the reverse
warning system is in active state, the buzzer in the instrument will make a short signal sound.

generate

Rear ground/
Rear fuse/D

Reverse warning sensor

34

A wire plug 32

B plug 20

Cpower

D Ground

The 30th wire supplies power to the C1 pin of rear ISU via fuse Fb31, the rear ISU gets electricity. The B1 pin of rear ISU is connectted to the left brake

lamp、high-mounted brake lamp and right brake lamp; the B4 pin

to the

left turn lamp; the B 15 pin

to the

left

lamp、

right

lamp and the

r adar ; B16

to the

left dimmer、license plate lamp and

right dimmer.

is connectted

rear

is connectted

rear

reversing

rear

reversing

1st pin of reversing

is connectted

rear

rear

（3）Brake lamp and reversing lamp circuit

FB31
50A

C1

R

31

B4

B1

B13

Rear ISU

Br/B

L

Br

FR3

15A

B16

Br

B15

FR4

15A

Gr

Gr

L

Br

L

G

FR 5

15A

Y

Gr

Y

Rear Combination Light System

Gr

O/B

B5

O/B

30

Figure15 -4

L

a

R

ing L

C

Bra ke amp nd evers

amp ircuit

Rear fo g lamp

High -mounted brake lamp

Installa ti on positi on of

right lam p

rear

Positive fuse box

The in stallation p osition

of

left lamp

rear

Reversing lam p

Bra ke lam p (dimm er)

License plate lamp

Turn lamp

35

Instrument System

The A5 automobile c ombination instrum ent contains serie s of instruments

and meters that show the vehicle status、all k inds of warning lamp that supervise
the vehi cle to pre vent abno rmal performance and inform the driv er and indicator
lamps th at show the driver how each part works and also illume the instruments
and met ers. The c ircuit is shown as figure 16-1.

Th e Voltage of the battery supply to the 11th pin of combin ation instrument

via fuse FB22. The voltage of the 15 th wire which has gone thro ugh the ignition
switch supply to the 13th p in of com bination instrument via fuse FB3, it is for the
fuel warning lamp、 door open warn ing lamp、 engine oil warni ng lamp、 brake
system warning lamp、ABS warning lamp、ai r bag warning lamp and so on . Once
the othe r end of these indica tors gain electricity, they'll work.

The 29th、30th pin of the combination instrument are connectted to CA N wire,

instruments are c onnectted to engin e EMS、 ABS、 fro nt ISU co mputer by CAN
wire, they share data information. The instrument system ca n read D TC by
apparatus, the 15th pin of the combination instrument is diagnose wire.

10

6

10

3

30

15

ACC1

ACC2

ILLUM

31

FB22

7.5A

FB3

7.5A

ECU/A2/ 6

11

13

12

17

16

27

18

7

32

3

5

30

29

9

2

26

24

15

To Combination Instrument

Instrument/Front
Ground/13

To Brake Shoe

Thickness Sensor

To

ECU 59#

To

Handbrake

Instrument/Air
Conditioner/1

To Air Conditioner

Control

Panel Module 10#

Instrument/

FrontGround/2

Front

Ground/Roof/4

To

Sunroof

Module 3#

To

Dynamo

To Air Bag

Module

10#

Fuse Box L
Plug-In Unit 10#

Fuse Box G

Plug-In Unit 4#

Fuse Box G

Plug-In Unit 7#

Instrument/Front
Ground/B5

Instrument/Front

Ground/B4

To Front I SU
Plug-In Unit

11#

To Combination

Switch2#

Instrum ent/Air
Bag/D#

ECU/A2/16

Brake
Shoe

Alarm

Vehicle
Speed

Signal
Output

Handbrake
Indicator

Light

Vehicle
Speed

Signal
Input

Charge
Indicator

Light

Air Bag
Alarm

Backl ight
Power

Supply

Ignition
Switch

Power
Supply

Normal
Live

Wire

Engine Oil

Pressure

Alarm

Brake Fluid
Level Alarm

Side Air Bag
Warning Lamp

Diagnosis

Line

To

Diagnosis

Port 7#

Instrument/

AirBag/B#

TO

Bag Module

47#

Brake Fluid

Level

Sensor

Engine Oil

Pressure

Switch

Figure16-1

Ci rcuit Diagram

Instrument System

Instrument/Front
Ground/1

ECU/A2/11

ECU/A1/ 15

Position of combination Ins trument

8

21

Oil Level

Signal Input

Fuel

Level Sensor

Instrument/Front

Ground/12

Front Ground/Rear
Ground B/D#

31

CAN Line
Wake Input

To

Front ISU PEI

Plug-In Unit 2#

Engine Oil Pressure Switch

30

15

ACC1

ACC2

ILLUM

31

Circuit Analysis：

Fuel Leve l Sensor

Brake Fluid Level Sensor

36

Ground

CAN-H

CAN-L

Front ISU

A15

B23

C17

C19

C18

The wiper system ciruit is shown as figure 17-1 .
The ACC2 power supply w ire supplies power to the C19 of front ISU、the

3rd、7th、8th pin of wiper switch via fuse FB12.

When the wiper switch is set at the HI positio n, the 2nd、3rd pin of the

wiper switch are conne ctted, the ACC2 power supply wire→the 3rd pin of wiper
switch→the 2nd pin of wiper switch→the 2 nd pin of wiper motor→the 5th pin of
wiper motor→ the 31st line are connectted to ground. The wipe r motor will work
in high speed then.

When the wiper motor is set at the position o f LO, the 3rd、 4th pin of

wiper switch are conne ctted, the ACC2 power supply wire→the 3rd pin of wiper
switch→the 4th pin of wiper switch→the 4 th pin of wiper moto r→the 5th pin of
wiper motor→ the 31st line are connectted to ground. The wipe r motor will work
in low speed then.

When the wiper switch is set at the WASH position, the 8th and 9th pin are

connectted, the ACC2 power supply wire→8th pin of wiper switch→9th pin of wiper
switch→washing motor→the 31st line are connectted to ground. The washing motor
will spew water then.

When the wiper switch is at the position of INT, the 4th、 5th pin are

connectted, 6th、7th pin are connectted, when the wiper switch input intermission
signal to the front ISU via A15pin, the inner relay of front ISU will electrify for 0.5s.
After 0.5s,The ACC2 power supply wire→the 1st pin of wiper Motor→the 3rd pin of
wiper Motor→ the C18 pin of front ISU→the C17 pin of front ISU→ the 5th pin of
wiper switch→the 4th pin of wiper switch→the 4th pin of wiper motor→the 5th pin
of wiper motor→the 31st line are connectted to ground. The wiper motor will work
in low speed then. the motor will operate for one circle and stop at the stop position
with the control of wiper motor cam plate switch circuit.

If the input time of washer switch is over 0.3s, the inner washer o f front

ISU will elec trify. Whe n the washer switch is in the connect position, the wiper
motor will continue to work. If the washer switch is disconn ected aga in, the
motor will co ntinue to o perate for 2 circles.

Wiper Switch

Figure17-1

Circuit Diagram

Wiper System

Wiper System Circuit Analysis:

W iper Moto r Pla ce

Wiper Mo tor

Wiper Motor build in Place

Wiper System

MIST

OFF

INT

LO

HI

M

2

3

4

5 6

7

8

9

2 4

5

FB12
15A

M

3 1

30

15

ACC1

ACC2

31

ILLUM

WASH

Wiper

Switch

Wiper

Motor

Washer

Motor

3 7