66
Lit. No. 21857
June 15, 2003
VEHICLE HEADLAMP TEST
1.
Verify correct wire installation to
relays. See the Headlamp Test
Diagram.
2.
Turn ignition and headlight switch
on.
3.
Disconnect all harnesses at the
grill.
4.
All bulbs must be good.
At each relay, is there 12v at
terminal 30 with green (high
beam) or yellow (low beam)
wires?
Apply 12v to relay terminal
87a with red (high beam) or
orange (low beam) wires. Do
vehicle headlamps
come on?
Unplug plug-in harness
connectors at each vehicle
headlamp. Is there 12v at
the red wire (high beam) and
orange wire (low beam)?
Red or orange wires
open in plug-in
harness. Repair wire
or replace harness.
YES
NO
NO
Check vehicle output from
headlight connector to plug-in
harness. Repair vehicle
system or open wires in plug-
in harness.
Remove 12v jumper from
terminal 87a. Disconnect the
black/orange wire from
terminal 85 of both relays.
Do vehicle headlamps come
on?
Blue ground wire in plug-
in harness is open.
Repair wire or replace
harness.
NO
YES
YES
Black/orange wire in vehicle
harness is shorted to ground.
Repair wire.
Replace relay
YES
NO