2007-2009 Mustang GT/CS California Special

Interior lights won't come on

Old 4/3/10, 03:23 PM
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Interior lights won't come on

Gang when I open the drivers to passengers door the interior lights do not come on. The map light is working but not when the doors open. It sounds like a switch is bad but do any of you have any idea to what the problem is?
Old 4/3/10, 04:09 PM
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Originally Posted by bztz4m
Gang when I open the drivers to passengers door the interior lights do not come on. The map light is working but not when the doors open. It sounds like a switch is bad but do any of you have any idea to what the problem is?
I'll look into that and see what I come up with,maybe its just burned out,hope its not a short somewhere,I have a good book on all 2005 to 2009 mustangs ,I'll get back to you on this,
Old 4/3/10, 04:24 PM
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Thanks
Old 4/3/10, 04:41 PM
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Originally Posted by bztz4m
Thanks
here are some interior electrical lighting system diagrams,some of this might be help,Interior lights won't come on-picture-001.jpg
Old 4/3/10, 04:44 PM
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Interior lights won't come on-picture-001.jpg
Originally Posted by ricksGT/CS
here are some interior electrical lighting system diagrams,some of this might be help,Attachment 74080
Old 4/3/10, 04:49 PM
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Originally Posted by bztz4m
Thanks
did you check all the fuses and relays,you might need a ( multimeter ) for doing this ,to make sure you do not have a short somewhere.,,I'm doing some more reseach and reading on this matter,
Old 4/3/10, 05:44 PM
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I don't have a mulitmeter to check the fuses.
Old 4/3/10, 07:41 PM
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Is no-interior-light-on-opening one of the many options controlled by some arcane set of switch sequences?
Old 4/4/10, 11:24 AM
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dimmer switch ?
yah it's silly but I've been there on that one !
Old 4/4/10, 11:45 AM
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Ron,

You can check the door switch circuit if you have the IUP. The message "door ajar" appears in the information window in the speedo when the car is on and a door is open. Compare the message response between the driver and passenger doors to verify that the Smart Junction Box (SJB) knows the door is open.

If the proper message doesn't appear, then there is a problem somewhere along the circuit from the SJB to the door switch. First place to look is at the door switch, second place to look is at the connector to the SJB.

Another possible cause for lighting issues has been the water infiltration problem that a number of people have experienced. The firewall water leak gets the SJB wet, and strange things start to happen later on.
Old 4/4/10, 05:37 PM
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Thanks for the info guys.
Old 4/5/10, 01:26 PM
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The problem is fixed

Well I took the car down to a friend who owns a Mustang repair shop, he checked all the fuses and they were fine. The problem was who ever wired the alarm from the dealer did not crimp the wire to the fuse box correctly causing the short to the door lamp.

Ron
Old 4/5/10, 01:30 PM
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Glad you got it resolved.
Old 4/5/10, 01:47 PM
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Yeah me too.
Old 4/6/10, 03:39 PM
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Originally Posted by bztz4m
Well I took the car down to a friend who owns a Mustang repair shop, he checked all the fuses and they were fine. The problem was who ever wired the alarm from the dealer did not crimp the wire to the fuse box correctly causing the short to the door lamp.

Ron
I thought was on your 07/09 Mustang that have factory alarms don't they if so and it was why would someone go after market ? Glad your good now.
Old 4/6/10, 04:50 PM
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My GT/CS did not have the factory alarm so I bought through the dealer who had someone they contract to do the installation.
Old 4/6/10, 10:54 PM
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Originally Posted by bztz4m
My GT/CS did not have the factory alarm so I bought through the dealer who had someone they contract to do the installation.
Well if under warenty still the dealer is on the hook are they not they farmed it out ?
Like when I had my rust proofing done the retards went mental I totally freaked about the crap work and was apploaded by some Ford staff and that farmed agent was siht canned right after.
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