Lifan 620. 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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