Check the back-up light switch. 
1. Turn the ignition switch to OFF.
2. Disconnect the connector of neutral position switch.
3. Measure the resistance between neutral position switch terminals.
|
Gear shift position |
Terminal No. |
Specified resistance |
|
Neutral position |
1 and 2 |
Less than 1 Ω |
|
Other positions |
1 MΩ or more |
4. Replace faulty parts.