Use Diagnostic Trouble Codes (DTCs) (from the DTC checks) in the table below to determine the trouble area and proper inspection procedure. The Supplemental Restraint System (SRS) diagnostic trouble code chart is shown below as an example.

Symptom simulation
Problem symptoms tableOn-vehicle inspection
1. CHECK BATTERY ELECTROLYTE LEVEL
(a) Check the electrolyte quantity of each cell.
Maintenance-free battery:
If it is under the lower level, replace the battery.
Except Maintenance-free battery:
If it is under the lower level, add distilled water.
2. Except Maintenance-free battery:
CHEC ...