Apply battery voltage to the connector, and check the LED illumination condition.

• OK:

• Measurement Condition	Specified Condition
  Battery positive (+) → Terminal 3 (ILL+) Battery negative (-) → Terminal 2 (ILL-)	Light illuminates

Measure the resistance according to the value(s) in the table below.

• Standard Resistance:

• Tester Connection	Switch Condition	Specified Condition
  4 (F) - 1 (E)	Hazard warning signal switch off	10 kΩ or higher
  4 (F) - 1 (E)	Hazard warning signal switch on	Below 1 Ω

If the result is not as specified, there may be a malfunction in the hazard warning switch.