With Generic Scan Tool

How To Clear Trouble Codes
Trouble codes can only be cleared by using a Scan Tool. If a "scan tool" is not available then inform the owner of the stored codes and suggest that the codes are cleared upon the next visit to an Isuzu/Isuzu dealership.

Scan Tool Diagnostics
A scan tool can be used to read current and history codes and to clear all history codes after a repair is complete. The scan tool must be updated to communicate with the SRS through a replaceable cartridge or a manufacturer's update before it can be used for SRS diagnostics. To use the scan tool, connect it to the DLC connector and turn the ignition switch "ON". Then follow the manufacturer's directions for communication with the SRS. The scan tool reads serial data from the SDM "Serial Data" output (terminal 24) to the DLC connector (terminal 9).