Examination
To test the switch, disconnect the electrical connector and use an ohmmeter to check if the switch contacts close (resistance should be zero) when reverse gear is engaged. Otherwise, the switch is defective and must be replaced.
Removal and installation
1. To improve access to the switch, remove the air lines to the engine, battery, and battery stand.
2. Disconnect electrical connector (indicated by an arrow), unscrew the switch and remove it together with the O-ring.
3. Installation is made in sequence, return to removal.