Jeep KJ 2005 Service Manual page 507

8L - 70 LAMPS/LIGHTING - EXTERIOR
TRAILER TOW RELAY (Continued)
ergized, spring pressure returns the movable contact
back against the normally closed contact.
The inputs and outputs of the trailer tow relays
include:
• Common Supply Terminal (30) - The common
feed terminal is connected to the circuit connected to
the normally open terminal (87) when the relay is
energized, or to the circuit connected to the normally
closed terminal (87A) when the relay is de-energized.
• Coil Ground Terminal (85) - The coil ground
terminal is connected to a ground circuit at all times.
• Coil Battery Terminal (86) - The coil battery
terminal is connected to the circuit that controls the
relay output. When battery voltage is applied to this
terminal, the relay is energized.
• Normally Open Terminal (87) - The normally
open terminal is connected to the circuit connected to
the common supply terminal (30) whenever the relay
is energized.
• Normally Closed Terminal (87A) - The nor-
mally closed terminal is connected to the circuit con-
nected to the common supply terminal (30) whenever
the relay is de-energized.
The trailer tow relays can be diagnosed using con-
ventional diagnostic tools and methods. Refer to the
appropriate wiring information.
REMOVAL
WARNING: To avoid personal injury or death, on
vehicles equipped with airbags, disable the supple-
mental restraint system before attempting any
steering wheel, steering column, airbag, occupant
classification system, seat belt tensioner, impact
sensor, or instrument panel component diagnosis
or service. Disconnect and isolate the battery neg-
ative (ground) cable, then wait two minutes for the
system capacitor to discharge before performing
further diagnosis or service. This is the only sure
way to disable the supplemental restraint system.
Failure to take the proper precautions could result
in accidental airbag deployment.
CAUTION: Be certain any removed trailer tow relay
is replaced with the same relay size and type that
was removed.
NOTE: The trailer tow relay bank contains four
relays. The service procedures for each relay are
the same.
(1) Disconnect and isolate the battery negative
cable.
(2) Remove the trim from the right side quarter
inner panel. (Refer to 23 - BODY/INTERIOR/QUAR-
TER TRIM PANEL - REMOVAL).
(3) Reach through the access hole in the quarter
inner panel behind the right rear wheelhouse to
locate and retrieve the trailer tow relay connector
bank, which is wrapped within a foam rubber enve-
lope and placed on the top of the right rear wheel-
house between the quarter inner and outer panels
(Fig. 74).
Fig. 74 Trailer Tow Relay Wrap
1 - FOAM WRAP
2 - REAR BODY WIRE HARNESS
CAUTION: Use proper precautions to protect your
skin and the rear body wire harness from cuts or
scrapes caused by contact with the sharp edges of
the quarter inner panel sheet metal while servicing
the trailer tow relay connector bank.
(4) Pull the trailer tow relay connector bank into
the cargo area far enough to access the relays for ser-
vice.
(5) Carefully remove the trailer tow relay connec-
tor bank from the foam wrap.
(6) Remove the appropriate relay by grasping it
firmly and pulling it straight out from the connector
bank (Fig. 75).
KJ