1) Inspect the 4WD switch for illumination when turning the lighting switch ON.
1) Inspect for continuity between the connector terminals using a DMM when the 4WD switch is operated.

| Switch operation |
Terminal No. |
Continuity |
| 2H position |
1-2 |
Yes |
| 4H position |
2-4 |
|
| 4L position |
1-2 2-4 |