Scan Tool Does Not Power Up

Fig 1: Scan Tool Does Not Power Up Schematic

Courtesy of GENERAL MOTORS CORP.

Most Scan tools use the battery power supply as well as the ground circuits at the DLC. This chart will only diagnose the vehicle, not the Scan tool. Before using this chart, make sure that the Scan tool operates correctly on another vehicle.

Fig 2: Scan Tool Does Not Power Up Chart

Courtesy of GENERAL MOTORS CORP.