Without Using SUZUKI Scan Tool

Check that "Clock/Temp, display" (1) comes ON when ignition switch is turned to ON position.
Using service wire (2), ground diagnosis switch terminal in monitor coupler (3).

Fig 1: Using Service Wire (2), Ground Diagnosis Switch Terminal In Monitor Coupler

Courtesy of SUZUKI OF AMERICA CORP.

With the ignition switch ON position and leaving engine OFF, read DTC from "Clock/Temp, display". Refer to "DTC TABLE ".
After completing the check, turn the ignition switch OFF position and disconnect service wire from monitor coupler.