Service Precautions

Before proceeding with diagnosis, observe the following precautions:

• Ensure vehicle has a fully charged battery and functional charging system.
• Visually inspect connectors and circuit wiring being worked on.
• DO NOT cause short circuits when performing electrical tests. This will set additional DTCs, making diagnosis of original problem more difficult.
• DO NOT use a test light in place of a voltmeter.
• When a vehicle has multiple DTCs, always repair lowest number DTC first.