ELECTRICAL 5 - 44
November 2007 GEM Service Manual
ACCESSORY SYSTEM TROUBLESHOOTING CHART
(CONTINUED)
Condition Possible Causes and
Diagnostic Steps
Correction
The tail lamps do not
work (when the lights
are turned on), but the
rear directional
indicators do work.
Disconnect the taillight harness
from the rear harness. Using an
ohmmeter, measure resistance
from pin 2, 3 or 4 to ground. The
resistance should measure no
more than 100 ohms.
If the resistance to ground is higher than 100
ohms for either pin 2, 3, or 4, check for a loose
ground connection.
The rear directional
indicators do not work,
but the front directional
indicators do work.
There is probably a loose or
broken connection between the
PSDM in the rear harness and
the taillight harness.
Use the Rear Lighting Circuit Diagram and a
voltmeter to isolate the problem.
Horn does not work. Visually inspect the fuse F1 or
measure with an ohmmeter to
determine if it is open.
Check voltage circuits, horn,
horn switch (part of the
multifunction switch), and
ground.
Replace the fuse if open.
Check for voltage at the horn when pressing the
horn switch. If voltage is not present, check the
horn switch and the circuit. If horn switch is
faulty, replace the horn switch. If horn switch is
OK, check the horn, horn ground and voltage
circuit. Use the Horn/Power Outlet Circuit
Diagram and a voltmeter to isolate the problem.
Heater does not work. Visually inspect fuse F2 or
measure with an ohmmeter to
determine if it is open.
Heater switch.
Blower motor.
Replace the fuse if open.
Use the Heater Circuit Diagram and a voltmeter
to check the wiring connections, the heater
switch and the blower motor to isolate the
problem.
Heater operates but is
blowing cold air.
Visually inspect fuse F12 or
measure with an ohmmeter to
determine if it is open.
Heater contactor.
Heater element.
Replace the fuse if open.
Use the Heater Circuit Diagram and a voltmeter
to check the wiring connections, the heater
contactor and the heater element to isolate the
problem.
Light bar does not
work.
Visually inspect fuse F8 or
measure with an ohmmeter to
determine if it is open.
Light bar switch. Light bar.
Replace the fuse if open.
Use the Security Light Bar Circuit Diagram and a
voltmeter to isolate the problem. Check the wire
connections, the light bar switch and the light bar.
Power outlet does not
work.
Visually inspect fuse F8 or
measure with an ohmmeter to
determine if it is open.
Replace the fuse if open.
Measure the voltage at the PSDM S, pin 3. If it is
12 VDC the power outlet has a loose or broken
connection to the ground or at PSDM S, pin 3.
If there is no voltage and the other accessories
work, replace the PSDM.
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