8-6
BODY ELECTRICAL SYSTEM
DIAGNOSIS
HEADLIGHT
Trouble
Possible Cause
Correction
Headlights do not light up
Bulb blown
Headlight switch faulty
HEAD R and L fuses blown
Wiring or grounding faulty
Replace bulb
Replace headlight switch
Replace fuses to check for short
Repair circuit
Only one headlight does
not light up
Bulb blown
HEAD R or L fuse blown
Wiring or grounding faulty
Replace bulb
Replace fuse to check for short
Repair circuit
Only one beam (“Hi” or
“Lo”) does not light
Bulb blown
Lighting or dimmer switch faulty
Wiring harness faulty
Replace bulb
Replace switch
Repair circuit
TURN SIGNAL AND HAZARD WARNING LIGHTS
Trouble
Possible Cause
Correction
Flash rate high or one side
only flashes
Bulb blown on “flash rate high”-side
Incorrect bulb
Turn signal/hazard warning relay faulty
Open circuit or high resistance
existing between combination switch
(turn signal/hazard warning switch) and
light on one side
Wiring or grounding faulty
Replace bulb
Replace bulb
Replace relay
Repair circuit
Repair circuit
No flashing
HAZARD HORN and/or TURN BACK
fuse blown
Open circuit or high resistance existing
between battery and switch
Turn signal/hazard relay faulty
Combination switch (turn signal/hazard
switch) faulty
Wiring or grounding faulty
Replace fuses to check for short
Check bulb and check circuit
Replace relay
Replace switch
Repair circuit
Flash rate low
Supply voltage low
Turn signal/hazard relay faulty
Check charging system
Replace relay
CLEARANCE, TAIL AND LICENSE PLATE LIGHTS
Trouble
Possible Cause
Correction
All lights do not light up
Bulb(s) blown
TAlL STOP fuse blown
Combination switch (lighting and dim-
mer switch) faulty
Wiring or grounding faulty
Replace bulb (s)
Replace fuse to check for short
Replace switch
Repair circuit
Some lights do not light up
Bulb(s) blown
Wiring or grounding faulty
Replace bulb (s)
Repair circuit