Service manual

94
Switched Outputs
The switched outputs should operate each time a button is pressed, whether the igni-
tion is on or off. To check their operation, press a button while listening to the relays in
the Smart Fuse Block Plus. The Relays will operate even if the associated fuses are
opened. Power for these circuits comes from the OEM battery circuit. If the relays do
not operate, check for the presence of battery voltage at the module before going fur-
ther. Each of the four-switched circuits is fused individually. If there is a problem with a
particular circuit, check the fuse associated with that circuit.
Courtesy Lights
The courtesy lights output should be on when the doors are opened. If the doors are
left opened for more than 20 minutes, they will go off. (If the ignition is on and the doors
are opened, the lights will never go off). To check this output, open the door and turn
the ignition on. Power for this circuit comes from the OEM battery and Ignition circuits.
Check the Courtesy Light fuse and the presence of these voltages before going further.
Trouble Shooting
Problem Possible
Cause/ Solution
Lights or TV do not
come on.
Fuses F3, F4, F6 or F7 7.5 amp open. Check and replace fuse
Listen for relays clicking in module when buttons are pressed. Clicking re-
lays indicate module is working.
Faulty OEM battery feed. Check for power coming from the OEM battery
feed at J6
Check signal line for switch voltage on J7-2. Should be 12 volts and should
drop when button is pressed. If not, check wiring and switch panel.
Short signal line, J7-2, to ground, Lights 1 should switch.
Replace Module.
Lights and TV do not
go off when ignition is
turned off.
Check ignition input at J3. Should be 12 volts with ignition on and 0 volts
with ignition off.
Courtesy Lights won’t
come on when doors
are open.
Courtesy Light fuse, F2, open, Replace fuse.
Door pin switches not working. Check for 12 volts between pins of J2 when
doors are open.
Check Courtesy Defeat Switch on dash (GM only).
Courtesy Lights won’t
go off when doors are
closed.
Door pin switch stuck or shorted. Unplug J2, lights should go off in 12 sec-
onds.
Check courtesy light switch on head light switch.
Replace module.
Courtesy Lights do not
stay on for 12 seconds
Check ignition feed. Should be 0 volts with ignition off. If not check wiring.
Panel back lighting not
working.
Check fuse F10. Replace if open.
Replace Module.