Testing for a Short to Voltage

Special Tools

EL-39200-B Digital Multimeter (DMM)

For equivalent regional tools, refer to Special Tools.

Danger: This procedure should not be performed on high voltage circuits. Performing this procedure on high voltage circuits may result in serious injury or death.

Caution: Refer to Test Probe Caution.

The following procedure tests for a short to voltage in a circuit.

  1. Remove the power feed (i.e. fuse, control module) from the suspect circuit.
  2. Disconnect the load.
  3. Set the digital multimeter (DMM) to the V (DC) position.
  4. Connect the positive lead of the DMM to one end of the circuit to be tested.
  5. Connect the negative lead of the DMM to a good ground.
  6. Switch the vehicle power mode to Vehicle in Service Mode and operate all accessories.
  7. If the voltage measured is greater than 1 V, there is a short to voltage in the circuit.