Toyota Hilux Surf 1993 Owner's Manual page 854

Check for Tester connection
Voltage
BODY ELECTRICAL SYSTEM
(Relay Circuit/Connector connected)
Connect the wire harness side connector to the relay and
inspect wire harness side connector from the back side
as shown.
Light control switch
position
Light control switch
position
Headlight dimmer
switch position
If circuit is as specified, replace the relay.
4. INSPECT PARKING BRAKE SWITCH
(See page BE–39)
– Lighting System
Condition
OFF
TAIL or HEAD
OFF
TAIL or HEAD
Low beam or High beam
Flash
BE–21
Specified value
No voltage
Battery positive voltage
No voltage
Battery positive voltage
No voltage
Battery positive voltage