CONDITION POSSIBLE CAUSES CORRECTION
HEADLAMPS (HIGH &
LOW) DO NOT
ILLUMINATE
1. No voltage at either headlamp. 1. Voltage should always be present. Trace
short circuit and replace BOTH headlamp
fuses. Refer to Group 8W. Check wiring
circuit from Right headlamp fuse to
headlamp. (Repeat for Left side)
2. No ground for high and low beam
circuit.
2. Ground should always be present
according to switch position. Check ground
at headlamp switch. Check wiring circuit
from headlamp switch to Multifunction
switch. Check headlamp switch and
Multifunction switch continuity. Repair circuit
ground, refer to Group 8W.
3. Headlamp bulb(s) defective. 3. Replace bulb(s).
4. Faulty headlamp switch. 4. Replace headlamp switch.
5. Faulty headlamp dimmer
(Multifunction) switch.
5. Replace Multifunction switch.
6. Broken connector terminal or wire
splice in headlamp circuit.
6. Repair connector terminal or wire splice.
HEADLAMPS (LOW
BEAM) DO NOT
ILLUMINATE.
1. No ground for low beam circuit. 1. Ground should be present according to
Multifunction switch position. Check wiring
circuit from Multifunction switch to
headlamp. Trace open circuit in wiring and
repair. Refer to Group 8W.
Check Multifunction Switch for continuity.
HEADLAMPS (HIGH
BEAM) DO NOT
ILLUMINATE.
1. No ground for high beam circuit. 1. Ground should be present according to
Multifunction switch position. Check wiring
circuit from Multifunction switch to
headlamp. Trace open circuit in wiring and
repair. Refer to Group 8W.
Check Multifunction Switch for continuity.
HEADLAMPS (LOW
BEAM) ALWAYS
ILLUMINATE AND CAN
NOT BE SHUT OFF.
1. Low beam circuit from bulb to
Multifunction switch is shorted to
ground.
1. Ground should be present according to
Multifunction switch position. Check wiring
circuit from Multifunction switch to
headlamp. Trace short circuit in wiring and
repair. Refer to Group 8W.
HEADLAMPS (HIGH
BEAM) ALWAYS
ILLUMINATE AND CAN
NOT BE SHUT OFF.
1. High beam circuit from bulb to
Multifunction switch is shorted to
ground.
1. Ground should be present according to
Multifunction switch position. Check wiring
circuit from Multifunction switch to
headlamp. Trace short circuit in wiring and
repair. Refer to Group 8W.
HEADLAMP SWITCH OFF
HEADLAMPS AND
HIGHBEAM INDICATOR
REMAIN ON AND ARE
DIM.
1. Headlamp switch feed circuit
shorted to ground.
1. Check wiring circuit from right headlamp
fuse to headlamp. Repeat for left side.
Trace short circuit in wiring and repair.
Refer to Group W.
DN LAMPS 8L - 3
DIAGNOSIS AND TESTING (Continued)