T100 Extra Cab Pickup 4WD V6-3.4L (5VZ-FE) (1997)
Four Wheel Drive Indicator Lamp: Testing and Inspection
4 WD Indicator Switch
INSPECT SWITCH
1. Check that the there is continuity when the switch pin is pushed.
2. Check that there is no continuity when the switch is free.
If operation is not as specified, replace the switch.