Not using SUZUKI scan tool

WARNING: This page is about a different car, the 2006 Suzuki XL-7. However, it is still accessible from the selected car via links, so may be relevant.

Perform LOW TIRE PRESSURE WARNING LIGHT CHECK .
Open driver side door.
Perform the following Steps a) to c) within 18 seconds after ignition switch turned ON.
1. Press driver side door switch within 5 seconds after ignition switch turned ON. Keep the switch pressed for 2 seconds.
2. Release driver side door switch and then press driver side door switch for 2 seconds or more by hand.
3. Release driver side door switch and then press driver side door switch for 5 seconds or more by hand.
  
  Fig 1: Flashing Pattern - Low Tire Pressure Warning Light
  Courtesy of SUZUKI OF AMERICA CORP.
Read flashing pattern of low tire pressure warning light which represents DTC as shown in example below and write it down. When more than 2 DTCs are stored in memory, DTCs are indicated in ascending order.
NOTE:
- DTCs are indicated repeatedly until the ignition switch is turned OFF.
- DTCs are output after the low tire pressure warning light lights up for 5 seconds and turns off for 5 seconds. Also, when a DTC is indicated repeatedly, the low tire pressure warning light lights up and turns off for 5 seconds respectively before the same DTC is indicated again.
Fig 2: Flashing Pattern Of Low Tire Pressure Warning Light (Example)
Courtesy of SUZUKI OF AMERICA CORP.
After completing the check, turn ignition switch to OFF position.