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Precautions to take while servicing electronic components in an automobile

 

A good technician must take some necessary precautions before servicing the vehicle computer or any controlled systems. The BCM or ECM or any control module is designed to work and withstand maximum current draws associated with usual operations. However, Control modules might get damaged if overloading of any of the system circuits take place. So, follow these service precautions to prevent control modules and circuit damage:

1. Unless the service information instructs you to do so, do not ground or apply voltage to any controlled circuits.

2. It is always recommended to use only a high impedance multimeter (10 megaohm or greater) to test the circuits. The combined opposition to current created by the resistance, capacitance, and inductance of the meter is called its impedance. Unless specifically instructed to do so in the service information, it is suggested never to use a test light.

3. Before making or breaking electrical connections to the control module, do make sure the ignition switch is turned off properly before making or breaking electrical connections to the control modules.

4. Turn off the ignition switch before making or breaking any electrical connections to sensors or actuators unless instructed otherwise in the service information.

5. Turn off the ignition switch whenever connecting or disconnecting the battery terminals. It should also be turned off when pulling and replacing the fuse.

6. You should not connect any other electrical accessories to the insulated or ground circuits of the computer-controlled systems.

7. Use only manufacturer’s recommended specific test and replacement procedures for that specific model of vehicle that is being serviced.

8. To prevent static discharges that may damage electronic components, wear an electrostatic discharge (ESD) strap that grounds your body.

By following these precautions and manufacturer recommended service information, you can avoid having to replace expensive electronic components for cost effective and safe operation.

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