Chery A15. Manual — part 155

Chery A15 Maintenance Manual

Chapter Four: Airbag System

Section One: Operating Precautions

I. Preventive Measures to be Taken in Operation

Improper maintenance will cause the incidental inflation of airbag and serious

consequential accidents, which may lead to trigger failures of airbag when needed. Do

read carefully following instructions before maintenance (including disassembling,

assembling, checking and replacing parts) and operate in accordance with proper

procedures specified in Maintenance Manual.

(1). Sometime the symptoms of SRS (auxiliary protection system) are difficult to

diagnose, therefore fault code is the most important information source of diagnosis.

Always check against fault code first before disconnecting battery when diagnosing

auxiliary protection system.

(2). Always start maintenance after ignition switch is turned to LOCK position and

battery cathode (-) terminal has been disconnected for five minutes, for auxiliary

protection system is equipped with a backup power source.

(3). In case SRS is not activated in slight collision, check steering wheel airbag

assembly and airbag sensor assembly.

(4). Do not use SRS parts from other vehicles. Always use new parts for replacement.

(5). Do not repair steering wheel airbag assembly or airbag sensor assembly for reuse.

(6). Do not shake steering wheel pad nor place a magnet close to the pad. Do not

expose steering wheel pad or airbag sensor assembly in hot air or flame.

(7). If steering wheel pad or airbag sensor assembly falls off, or casing, bracket or

connector has defects like crack and dent, replace them with new parts. Any liquid

such as grease, detergent, engine oil or water spilled on steering wheel pad shall be

wiped off immediately with dry cloth.

Chery A15 Maintenance Manual

(8). Steering wheel pad shall be placed on a stable place with the top surface upward.

Do not place any other objects on the pad.

(9). Always dispose of airbag before abandoning vehicle or steering wheel pad.

(10). The inflating device in steering wheel pad will be hot after airbag is inflated.

Dispose of the device after it cools down.

(11). Circuitry faults shall be diagnosed with a high-impedance (min. 10kΩ/V)

volt-ohmmeter.

(12). Follow the precautions specified on the rating plates of SRS parts.

(13). Check SRS warning light performance after maintenance of auxiliary protection

system.

II. Spiral Cable

Spiral cable (as shown in figure below) serves as circuit connection between vehicle

body and steering wheel. Steering wheel must be installed on steering post properly

with the spiral cable at the middle position; otherwise the spiral cable might come off

or cause other faults. Please refer to this manual for proper installation of steering

wheel.

III. Steering Wheel Pad

Chery A15 Maintenance Manual

1. SRS airbag is fitted in steering wheel. Airbag includes a trigger, an ignitor, a gas

generator, etc. When airbag sensor assembly sends a signal, the trigger will activate

inflation of airbag.

2. Steering wheel pad shall be placed with top surface upward when disassembling or

replacing. Lock the locking bar of dual-lock connector and handle with care to avoid

damaging connector. Do not place a steering wheel pad over another (If the pad is

placed with the metal surface upward, the airbag might be incidentally triggered and

cause serious accidents).

Wrong

Correct

3. Do not measure the trigger resistance (to avoid incidental trigger, which is

extremely dangerous).

4. Do not apply grease on steering wheel pad, nor clean it with detergent of any kind.

5. Store steering wheel pad in an ambient temperature lower than 93ºC (200ºF) and

humidity lower than 40%, and keep it away from electric noises.

6. Disconnect airbag connector before any welding operation.

7. Trigger the airbag with a special tool before disposing of the vehicle or the steering

wheel pad.

IV. BCM (Airbag Control Module)

1. BCM (airbag control module, as shown in the figure) is located on the floor under

warm air water tank. BCM consists of airbag sensor, safety sensor, diagnostic circuit,

ignition control, driving circuit, etc. BCM receives signal from airbag sensor and

Chery A15 Maintenance Manual

determines whether to activate SRS.

BCM

2. If the airbag is triggered due to collision, do not reuse airbag computer.

3. Maintenance (including loosening the set bolt of airbag central sensor assembly)

may be started only after ignition switch is turned to LOCK position and battery

cathode terminal has been disconnected for five minutes.

V. Wiring and Connector

SRS wirings are all held in a yellow corrugated tube, and all connectors are

standard-yellow colored. In case wiring comes off or connector is damaged due to

incident, repair or replace as per corresponding instructions.

VI. SRS Connector

All SRS connectors are yellow-colored to be distinguished from other connectors.

SRS connectors with special functions and designs ensure high reliability by using gilt

terminals. A dual-locking pin locks the electronic connector lug mechanism to prevent

terminals from sliding out, as the figure shows.

Dual-locking pin

Airbag connector