For 1990-2009 cars

Notice: Refer to Test Probe Notice in the Preface section.

The following procedure measures the voltage at a selected point in a circuit.

1. Disconnect the electrical harness connector for the circuit being tested, if necessary.
2. Enable the circuit and/or system being tested. Use the following methods:

• | Turn ON the ignition, with the engine OFF.

• | Turn ON the engine.

• | Turn ON the circuit and/or system with a scan tool in Output Controls.

• | Turn ON the switch for the circuit and/or system being tested.

3. Select the V (AC) or V (DC) position on the DMM.
4. Connect the positive lead of the DMM to the point of the circuit to be tested.
5. Connect the negative lead of the DMM to a good ground.
6. The DMM displays the voltage measured at that point.