With Scan Tool
METHOD OF READING THE DIAGNOSTIC TROUBLE CODESWhen using the scan tool
1. Connect the scan tool to the data link connector (16-pin) underneath the instrument under cover.
CAUTION: Connection and disconnection of the scan tool should always be carried out with the ignition switch in the OFF position.
2. With the ignition switch in the ON position, turn the auto-cruise control main switch to ON and take a reading of the diagnostic trouble codes.