Service Precautions

Before proceeding with diagnosis, following precautions must be observed:

• 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.