Lifan 620. Service manual - part 69

Table 5-2 (Continued) 

S/N 

Possible 

Faults 

Areas 

Fault Clearing Methods 

4 

PAB 

inexistence 

Front passenger 

air bag module 

Harness 

Air bag ECU 

1. Preparation before checking; 2. Check the front passenger 

air bag circuit, if normal, go to 3; if not, repair or renew the 

harness or interface between the air bag ECU and front 

passenger air bag module; 3. Check the air bag ECU, if 

normal, go to 4; if not, renew the air bag ECU; 4. Check the 

front passenger air bag module, if normal, the parts with faults 

5 

6 

7 

 
 
 
 
 
 
 
 
 
 
 

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1. Air bag circuit 

(as shown in Fig. 5-7 and Table 5-3) 

 

 

Driver safety belt switch 

A12 Power 

line 

A14 

Driver’s safety belt reminder warning lamp 

A15- 

A16+ 

Driver air bag module 

A17+ 

A18- 

Front passenger air bag module 

A19- 

A20+ 

Driver safety belt pre-tensioner 

A21+ 

A22- 

Passenger side safety belt pre-tensioner 

A23 GND 
A24 

To air bag indicator 

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2. Preparation before checking 
Before maintenance, carefully read the section 1.3 about the safety rules for air bag maintenance. 
In addition, following preparation work shall be carried out. 
(1) Remove the negative ground wire from the battery and wait for at least 3min. 
(2) Remove the driver and front passenger air bag modules, keep the air bag module upwards 
when storing the module (See the removal methods in Section IV). 
(3) Disconnect the interface of the driver and front passenger air bag modules, air bag ECU 
interface, as shown in Fig. 5-8. 
 

 

Fig. 5-9 

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(4) Connect the negative ground wire on the battery and wait for at least 3min. 
(5) Turn the ignition switch to the position of ACC or ON and wait for at least 20s. 
(6) Eliminate the flash DTC by the diagnostic instrument and read out the flash DTC. 

7. Check for driver air bag circuit 
(1) Measure the resistance between the DA+ and DA- at one side of the clock spring. Normal 
resistance shall be above 1MΩ. 
(2) Measure the resistance between the DA+ at one side of the clock spring and DA+ at one side 
of the air bag ECU. Normal resistance shall be within 1MΩ. 
(3) Measure the resistance between DA- at one side of the clock spring and DA- at one side of the 
air bag ECU. Normal resistance shall be within 1MΩ. 

 

Fig. 5-10 

 
(4) Connect the negative ground wire on the battery and wait for at least 3min. 
(5) Turn the ignition switch to the position of ACC or ON and wait for at least 20s. 
(6) Eliminate the flash DTC by the diagnostic instrument and read out the flash DTC. 

 

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