Safety Regulations for Electrical/Electronic Systems: Diagnosis

WARNING: This page is about a different car, the 2017 Chevrolet Spark. However, it is still accessible from the selected car via links, so may be relevant.

For testing purposes, use only a high-resistivity voltage tester.
The pyrotechnic system (such as airbags) may only be tested using the scan tool. In order to prevent unintentional deployment, never use a test lamp or multimeter to perform measurements on the pyrotechnic units - danger of injury.
The test operations during which wiring harness plug contacts or control units are connected to ground or the battery voltage (+12 V) must be performed with extreme care and concentration. A wrong contact can destroy internal circuits in the relevant control units.
The battery must be in good condition and adequately charged when performing diagnosis on electrical / electronic systems.
Only suitable test probes may be used for measuring so as to avoid damage to the contacts.