Measuring Voltage

WARNING: This page does not describe the selected car, but rather 8 other vehicles, including the 2007 GMC Yukon XL, 2007 GMC Yukon, 2007 Chevrolet Tahoe, 2007 Chevrolet Suburban, and 2007 Chevrolet Avalanche. However, it is still accessible from the selected car via links, so may be relevant.

NOTE: Refer to Test Probe Notice .

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

Disconnect the electrical harness connector for the circuit being tested, if necessary.
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.
Select the V (AC) or V (DC) position on the DMM.
Connect the positive lead of the DMM to the point of the circuit to be tested.
Connect the negative lead of the DMM to a good ground.
The DMM displays the voltage measured at that point.