JLD-4G24/JLD-4G20 

NL11-3021b

CAN总线

倒车雷达指示灯

背光调节开关

前照灯光轴调节开关

发动机防盗模块

 

Combination 

instrument

Headlampoptical axis adjusting switch 

Back-light adjusting switch 

Reverse radar indicator 

Engine coolant temperature sensor

Speed sensor 

Fuel fluid level sensor

Brake fluid level sensor

Oil pressure sensor 

Park brake switch 

Generator

Headlamp

Engine anti-theft module

Front fog lamp relay

Rear fog lamp relay

CAN main 

wire 

Radio-cassette player

Multifunction instrument 

2339

 

11.7.6 Diagnostic information and steps (JL4G18-E) 

11.7.6.1 Diagnosis descriptions 

Refer to 11.7.2 description and operation to get familiar with the system functions and operation 
before starting system diagnosis, so that it will help to determine the correct diagnostic steps, more 
importantly, it will also help to determine whether the situation described by the customer is 
normal. 

11.7.6.2 Visual inspection 

–  Inspect installed aftermarket equipment that may affect the operation of the instrument 

system. 

– 

Inspect components easy to access system to identify whether there is a significant damage 
that may lead to the fault. 

– 

Inspect whether the sensors for each instrument to display information are normal. 

11.7.6.3 Instrument active test list 

Testing part 

Test Items 

Beep when the lampet does not turn off. 

Beep when the key is not pulled out. 

Beep when the lampet does not turn off. 

Safety belt buzzer 

Co-driver safety belt buzzing 

Door open with buzzing 

Overspeed Buzzing 

Buzzer testing 

Parking motor buzzing 

Vertical section, horizontal section, special 
section and sign section. 

Clear away all of them. 

Warning of driver safety belt 

Co-driver safety belt warning, ABS 
warning ,and EBD warning 

LC testing 

Low oil mass warning 

Left water temperature alarm steering lamp 

Right steering lamp 

Opening alarm of trunk 

Low brake oil warning 

Digital output 

 

Airbag warning mi warning 

2340

SVS alarm 

Beep when the lampet does not turn off. 

Beep when the key is not pulled out. 

Beep when the lampet does not turn off. 

Safety belt buzzer 

Co-driver safety belt buzzing 

Buzzer testing 

Door open with buzzing 

11.7.6.4 Instrument terminal list 

NL11-3022b

16

1

2

3

4

5

6

7

8

9

10

11

12

13

14

15

17

32 31 30 29 28 27 26 25 24 23 22 21 20 19 18

IP01 组合仪表线束连接器1

 

Terminal 

No. 

Terminal Definition 

Terminal 

Status 

Specified conditions (voltage, 

current and waveform, etc.) 

1 Battery  Input 

12V/1A 

2 Ignition 

(+)  Input 

12V/1A 

3 

Instrument ground (-) 

Input 

GND/1A 

4 

Fuel signal 

Input 

Resistance value 

5 

Water temperature signal 

Input 

Resistance value 

6 

Sensor ground wire (-) 

Input 

GND/1A 

7 Parking 

motor  Input 

Pulse 

8 Empty 

 

/ 

9 

Park brake(low effective) 

Input 

GND/20mA 

10 

Communication port 

(instrument for testing) 

 / 

IP01 combination instrument harness 

connector1 

2341

11 Empty 

 

/ 

12 

ESP fault (Low and 

suspended) 

Input GND/20mA 

13 

EBD malfunctions (active 

suspension) 

Input 12V/20mA 

14 

Engine emission fault (low 

effective) 

Input GND/20mA 

15 

Four-wheel drive lock (low 

effective) 

Input GND/20mA 

16 4WD(low 

effective)  Input 

GND/20mA 

17 

Fuel consumption pulse 

signal 

Input Pulse 

18 

Disp button (low effective)

Input 

GND/20mA 

19 

Overspeed alarm dead 

(reserved) 

 

 

20 Empty 

 

/ 

21 Empty 

 

/ 

22 

Engine oil pressure alarm 

(low effective) 

Input GND/20mA 

23 Empty 

 

/ 

24 Empty 

 

/ 

25 

Safety belt unsecured(low 

effective) 

Input GND/20mA 

26 

Oil-water seperation（High 

effective  ） 

Input 12V/20mA 

27 

Pre-heating filament (low 

effective) 

Input GND/20mA 

28 

Right steering indication 

(high effective) 

Input 12V/20mA 

29 

Position lamp (high 

effective) 

Input 12V/20mA 

30 

Auxiliary safety belt 

unsecured(low effective) 

Input GND/20mA 

31 

ABS fault (high and 

suspension has effective ) 

Input 12V/20mA 

2342