The lamps and the hard wired circuits between components related to the interior lighting system may be
diagnosed using conventional diagnostic tools and procedures. Refer to the appropriate wiring information. The
wiring information includes wiring diagrams, proper wire and connector repair procedures, details of wire
harness routing and retention, connector pin-out information and location views for the various wire harness
connectors, splices and grounds.
However, conventional diagnostic methods will not prove conclusive in the diagnosis of the interior lighting
system or the electronic controls or communication between modules and other devices that provide some
features of the interior lighting system. The most reliable, efficient, and accurate means to diagnose the interior
lighting system or the electronic controls and communication related to interior lighting system operation
requires the use of a diagnostic scan tool. Refer to the appropriate diagnostic information.
COURTESY LAMP CIRCUIT
wheel, steering column, airbag, seat belt tensioner, impact sensor, or
instrument panel component diagnosis or service. Disconnect and isolate
the battery negative (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 SRS. Failure to take the proper
precautions could result in accidental airbag deployment.
NOTE: When diagnosing the inte rior lighting circuits, remember that high generator
output can burn out bulbs rapidly and repeatedly; and, that dim or flickering
bulbs can be caused by low generator output or poor battery condition. If one of
these symptoms is a problem on the vehicle, be certain to diagnose the battery
and charging system, then repair as necessary.
NOTE: A good ground is necessary for proper lighting operation. If a lighting problem
is being diagnosed that involves multiple symptoms, systems, or components,
the problem can often be traced to a loose, corroded, or open ground.
CONDITION POSSIBLE CAUSES CORRECTION
A SINGLE LAMP IN THE
COURTESY LAMP
CIRCUIT DOES NOT
ILLUMINATE
1. Ineffective or missing bulb.1. Test and replace the courtesy lamp
bulb if required.
2. Ineffective lamp switch.2. Test and replace a map/reading lamp
switch if required.
3. Ineffective ground circuit.3. Test and repair the open ground circuit
if required.
4. Ineffective feed circuit.4. Test and repair the open feed circuit if
required.
ALL LAMPS IN THE
COURTESY LAMP
CIRCUIT DO NOT
ILLUMINATE
1. Ineffective ground circuit.1. Test and repair the open ground circuit if required.
2. Ineffective feed circuit.2. Test and repair the open feed circuit if
required.
3. Courtesy DEFEAT feature 3. Turn courtesy DEFEAT feature OFF.
2009 Jeep Patriot Limited
2009 ACCESSORIES & EQUIPMENT Lamps/Lighting - Interior - Service Information - Compass & Patriot
a
Saturday, September 08, 2012 1:47:12 PM Page 5 © 2006 Mitchell Repair Information Company, LLC.