a. Set ignition switch at LOCK position,
b. Loosen the cathode cable of battery and keep this state for one minute at least,
c. Disassemble glove box,
d. Loosen the connector of safety airbag assembly at the side of passenger,
e. Is the connector of safety airbag assembly at the side of passenger normal?

Normal: make next step,
Abnormal: change the wiring harness

(2) Confirm malfunction reason is on safety airbag assembly at the side of passenger or on other parts.

a. Connect a good assembly on connector pin A and B of safety airbag assembly at the side of

passenger,

b. Connect the cathode cable of battery,
c. Set the ignition switch at ON position,
d. Is there the display of malfunction code? Or could the malfunction code be removed?

No: make next step
Yes: change the safety airbag assembly at the side of passenger.
Refer to safety airbag system, disassembling/assembling of safety airbag assembly at the side of
passenger.

(3) Check the wiring harness between safety airbag assembly at the side of passenger and electronic

control unit of safety airbag system.
a. Set ignition switch at LOCK position,
b. Loosen the cathode cable of battery and keep this state for one minute at least,
c. Disassemble the shell body of steering column,
d. Loosen the connector of helix cable,
e. Loosen the connector of safety airbag assembly at the side of passenger and driver,
f. Disassemble left inner trim board,
g. Loosen the connectors of all safety airbag system units,
h. Check the circuit between connector pin of safety airbag system electronic control unit and the

circuit between connector pin of safety airbag assembly at the side of passenger, and the circuit
between connector pin of safety airbag system unit and safety airbag assembly at the side of
passenger has following situation:

Earth
Short connection with power supply
Open circuit

i. Are the wiring harnesses above normal?

Normal: malfunction diagnosis ends
Abnormal: change related wiring harness.

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Malfunction of pre-tension safety belt (resistance is too big or too small, short circuit,

grounding and so on)

Test condition

Warning

If the treatment is wrong, safety airbag assembly and pre-tension safety belt might be

triggered to unfold to make heavy human hurt, so, before the treatment, it is necessary

to read repairing warnings carefully.

Refer to repairing warning of safety airbag system.

If having pre-tension safety belt

The resistance between connector pin 1, 2 or pin 3, 4 of safety  airbag system unit is

not in regulated scope.

The wiring harness between connector pin 1, 2 or pin 3, 4 of safety airbag system unit

happens short circuit.

The wiring harness between connector pin 1, 2 or pin 3, 4 of safety airbag system unit

happens open circuit, if there is not safety airbag at the side passenger.

Possible reason

Safety belt pre-tension has malfunction.

Connector between safety belt pre-tension and electronic control unit of safety airbag

system has malfunction.

Connector between safety belt pre-tension and grounding position has malfunction.

The circuit between safety belt pre-tension and electronic control unit of safety airbag

system happens open circuit or short circuit.

Circuit between safety airbag system unit and grounding position happens open circuit

or short circuit.

Safety airbag system unit has malfunction.

7. Malfunction of pre-tension safety belt

Diagnostic procedure

(1) Check the connector warning of safety belt pre-tension

If the treatment is wrong, pre-tension safety belt might be triggered to unfold to make heavy hu-
man hurt, so, before the treatment, it is necessary to read repairing warnings carefully.
Refer to repairing warning of safety airbag system.

a. Set the ignition switch at the LOCK position,
b. Loosen the cathode cable of battery and keep this state for one minute at least,
c. Disassemble B column defending board
d. Loosen the safety belt pre-tension connector
e. Is the safety belt pre-tension connector normal?

Normal: make next step
Abnormal: change the wiring harness

(2) Confirm malfunction reason is on pre-tension safety belt or on other parts.

a. Connect a good pre-tension safety belt on safety belt pre-tension connector,
b. Connect cathode cable of battery,
c. Set ignition switch at ON position,
d. Could the malfunction code be removed?

No: make next step,
Yes: change pre-tension safety belt.
Refer to safety airbag system, disassembling/assembling of pre-tension safety belt.

(3) Check the wiring harness between the pre-tension safety belt at the side of passenger and electronic

control unit of safety airbag system
a. Set ignition switch at LOCK position,
b. Loosen the cathode cable of battery and keep this state for one minute at least,
c. Loosen the connector of safety belt pre-tension module,

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d. Loosen the connectors of all safety airbag system units,
e. Check whether the connector between electronic control unit of safety airbag system and the

circuit between connector of safety belt pre-tension have following situations:

Earth
Short connection with power supply
Open circuit

f. Are the wiring harnesses above normal?

Normal: malfunction diagnosis ends
Abnormal: change related wiring harness.

8. Malfunction of impact output

Malfunction of safety airbag assembly at the side of passenger (resistance is too big

or too small, short circuit, grounding and so on)

Resting condition

Warning

If the treatment is wrong, safety airbag assembly and pre-tension safety belt might be

triggered to unfold and tighten  to make heavy human hurt, so, before the treatment, it

is necessary to read repairing warnings carefully.

Refer to repairing warning of safety airbag system.

Possible reason

Connector between impact output circuit and electronic control unit of safety airbag sys-

tem has malfunction.

Connector between safety airbag system unit and grounding position has malfunction.

The circuit between impact output circuit and electronic control unit of safety airbag

system happens open circuit or short circuit.

Circuit between safety airbag system unit and grounding position happens open circuit

or short circuit.

Safety airbag system unit has malfunction.

    (1)   Check whether this airbag controller has impact output function

a. Set ignition switch at LOCK position
b. Loosen the cathode cable of battery and keep this state for one minute at least
(2)  Check whether the connection of impact output connector is good,

    (3)  Check whether the impact output connecting wire is earth or is short connecting with other wires,
    (4)  Check whether impact output connecting wire is open circuit,
    (5)  Check whether the central control door lock control system or electric injection control system of

engine has   been changed,
Note: If repairing it by the steps above and requirements, indicating light or diagnostic tool

could display the mistakes before repairing all the time, please do not change it by
yourself, you should contact with the manufacturer as soon as possible avoid wrong
explosion or no explosion when using airbag.

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Diagnosis of impacted automobile

No matter whether the safety airbag has been unfolded, the inspection and maintenance for impacted auto-

mobile should be made by following sequence.

1. Check the ECU diagnostic signal.

(1) Connect the diagnostic joint of diagnostic tool,
(2) Use diagnostic tool to read the diagnostic result.

2. Repair sequence

Note: For the impact, when power supply of battery is lack, diagnostic tool could not communicate

with ECU, at this time, it is necessary to check and maintain the wiring harness of panel or use

exterior power supply.

(1) When safety airbag has been unfolded,

Following parts should be changed with new ones
a. Safety airbag assembly at the side of passenger
b. ECU
c. Safety airbag assembly at the side of driver
d. Pre-tension safety belt at the side of driver and passenger
Check the following parts, if they are abnormal, change them with new ones
a. Helix cable
b. Steering wheel, steering column, combination switch
Assembling state for steering wheel of safety airbag assembly at the side of driver
a. Check whether there is any abnormal noise in steering wheel, its action is flexible and clearance is

normal.

b. Check whether the joint of wiring harness is damaged or terminal is distorted.

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