9.3.5 Schematic
9.3.5.1 Schematic

Airbag Control Module

Instrument Cluster

Dedicated Data Cable

Instrument Panel

Passenger Recognition Sensor

Driver Seat Belt Switch

Passenger Seat Belt Switch

CAN Bus

FE09-5201b

Safety Protection Device

Pretension Seat Belt System

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9.3.6 Diagnostic Information and Procedures
9.3.6.1 Visual Inspection

–

Confirm Fault Symptom

In diagnostic, the most difficult situation is that there is no symptom. In this case, technician must thoroughly analyze the described
fault, and then simulate the fault occurring conditions and environment. Even for a very experienced technician, if carry out
diagnostics without verifying the fault, it is likely to ignore a number of important things, and even make misjudgments. This will
result in the diagnostic can not be continued.

–

Check the easy to access system components to identify whether there is a significant damage or a potential malfunction.

–

Connectors  pivot  and  vibration  support  parts  should  be  thoroughly  examined.  If  possible,  for  vibration  caused  failure,  it  is
recommended to use vibration method:

1. With a finger, gently shook the part that may be faulty and check for malfunction.

2. Gently shake the connector vertically and horizontally.

3. Gently shake the wiring harness vertically and horizontally.

–

Vehicle Inspection

A. Check the driver seat belt warning lamp:

a. Turn the ignition switch to "ON".

b. When the driver seat belt is released, check whether the driver seat belt warning lamp is flashing.

c. When the driver is seat belt fastened, check whether the driver seat belt warning lamp is off.

B. Check the passenger seat belt warning lamp:

a. Turn the ignition switch to "ON".

b. When the passenger seat belt is released, check whether the passenger seat belt warning lamp is flashing.

c. When the passenger is seat belt fastened, check whether the passenger seat belt warning lamp is off.

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Pretension Seat Belt System

Safety Protection Device

9.3.6.2 Driver Seat Belt Warning Lamp Inoperative

Schematic:

Safety Protection Device

Pretension Seat Belt System

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Diagnostic Steps:

Step 1

Use scan tool to access airbag control module.

(a)

Check for DTC.

Yes

Repair according to the DTC.

Yes

Step 2

Use scan tool to carry out active test.

(a)

Use "active test" function to control the driver seat belt
warning lamp, while observing whether the warning lamp
status (ON / OFF) is changed.

No

Replace the instrument cluster assembly

Yes

Step 3

Check the driver seat belt lock assembly.

(a)

Disconnect the driver seat belt lock connector SO21.

(b)

Test whether the driver seat belt switch status meets the
following requirements with a multimeter.

(c)

Release the seat belt, measure resistance between terminal
1 and 2.
Standard Resistance: Less than 1 Ω

(d)

Fasten the seat belt, measure resistance between terminal 1
and 2.
Standard Resistance: 10 kΩ or higher

Data normal?

No

Replace the driver seat belt lock assembly

Yes

Step 4

Check the wiring harness (driver seat belt lock to airbag control module).

1 2

Passenger Seat Belt Switch Harness 
Connector SO21

FE09-5202b

(a)

Disconnect the driver seat belt lock connector SO21 and the
airbag control module connector SO08.

(b)

Measure resistance between the connector SO21 terminal 2
and the connector SO08 terminal 10 with a multimeter.

(c)

Measure resistance between the connector SO21 terminal 1
and the connector SO08 terminal 9 with a multimeter.
Standard Resistance: Less than 1 Ω

(d)

Measure resistance between the connector SO21 terminal 2
and the body ground with a multimeter.
Standard Resistance: 10 kΩ or higher

Data normal?

No

Repair or replace the wiring harness or
connector.

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Pretension Seat Belt System

Safety Protection Device