Villager V6-201 3.3L SOHC VIN T SFI (1999)
Trailer Lamps: Initial Inspection and Diagnostic Overview
Inspection and Verification (Start Testing Here)
1. Verify the customer concern by operating the system.
2. Visually inspect for obvious signs of mechanical or electrical damage.
VISUAL INSPECTION CHART
Mechanical
^
Damaged trailer tow control unit
^
Damaged bulb(s)
^
Damaged tail lamp relay
^
Damaged headlamp switch
Electrical
^
Blown Central Junction Box (CJB) fuse:
-
F51 (15 A)
^
Damaged wiring harness
^
Loose or corroded connections
^
Damaged bulb(s)
^
Damaged tail lamp relay
^
Damaged headlamp switch
3. If the concern is not visually evident, determine the symptom and proceed to Symptom Chart. See: Symptom Related Diagnostic Procedures
Principles of Operation (How Does it Work?)
PRINCIPLES OF OPERATION
The trailer lamps 4-pin connector includes the following lamp outputs:
^
turn signals
^
stoplamps
^
tail lamps
^
hazard flasher lamps
The tail lamps output is directly from the tail lamp relay located in the fuse junction panel. The remaining lamp outputs are directly from the trailer
tow control unit.
Trailer Tow Control Unit
The trailer tow control unit (located behind the LR cargo shelf trim panel) directly controls the outputs to the following trailer lamps:
^
turn signals
^
stoplamps
^
hazard flasher lamps
The trailer tow control unit regulates the amount of voltage supplied to the trailer lamps when it receives an input from either turn signal, the
stoplamps or the hazard warning flasher lamps. If the trailer tow control unit receives a stoplamp input during either a turn signal or a hazard
flasher lamp event, it supplies more voltage to the trailer lamps to illuminate them brighter.
