1. Visually check the bulb for blowout.
2. Check the bulb specification. 
3. If NG, replace the bulb with a new part.
Measure the resistance between room light switch terminals.
|
Switch position |
Terminal No. |
Standard |
|
OFF |
— |
1 MΩ or more |
|
ON |
1 and 3 |
1.5±0.5 Ω |
|
DOOR |
2 and 3 |
1.5±0.5 Ω |