Question about 2003 Dodge Caravan

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Do the backup lights work off the transmission or a switch on the column

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I can relate ... been without reverse lights for a while.
Here's my understanding of the communications that take place in this process: when you put the vehicle in reverse, there is a backup light switch on the transmission that sends a signal to the Transmission Control Module (TCM), that then forwards that information to the BCM, and the BCM sends the signal to the backup lights.

Have had different diagnoses for the problem ranging from BCM (body control module), to FCM (front control module), to the standard bulb, wiring, etc. Dealer wanted to do a $1000+ job thinking it could be the BCM. Being cheap decided to do some troubleshooting on my own ... with help from another site where I contacted a Dodge Expert.

In my case, we tested wiring, and found there was a fault in the wire ... replaced with a new wire.
So sending 12V to from the battery to the lights made the reverse lights come on -- so wiring and bulbs good.

Didn't fully fix the issue ... tested the pin from the BCM that carrys the signal to the backup lights to come on and found that the BCM is NOT sending out the signal. Looks like it is a BCM issue but want to check to make sure the BCM is getting the right input signal. So that is now where my testing will go.

Hope that helps.

Posted on Oct 06, 2008

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I think they work off the transmission as the dealer fixed mywife's last year and it was covered unde rthe powertrain warranty. Unfortunately, they are not working again this year at inspection time...dealer said that it may be the body control module going bad. I disconnected the neagative battery terminal for 20 minutes to reset it and see if the reverse lights came on, but no luck...you may try it though. I'm still stuck without reverse lights...let me know if you find anything xxxaperdikes@hotmail.comxxx

Posted on Aug 31, 2008

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There are two sets of two wires across this combined neutral safety and backup light switch, for a total of 4 wires. Photos are at the end of this post.

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http://www.ford-trucks.com/forums/287185-back-up-light-and-neutral-safety-switch-2.html#post5601846

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C7TZ-7A247-A .. Neutral/Backup Switch (Motorcraft SW-600)

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Neutral switch location 1967/77:

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D0TZ-7B097-B .. Lever, Neutral Switch Actuator = From FTE sponsor DIRECT FORD PARTS: Ford suggested retail price: $18.72 / FTE member net: $13.23.

The switch is also still available from Ford, but the website is down so I can't post the list & net prices. .

1978 is the FIRST year the F100/350's have the neutral switch mounted on the transmission. __________________

Bill // Retired Ford Parts Manager // SoCal Chapter member // Part Number Research: 1928/2001 FoMoCo vehicles.

IMAGES
jim_pivonka.jpg
Driver side of the neutral / reverse switch showing the travel slot for the switch arm, the return tensioning spring, and the arm.

jim_pivonka_0.jpg
The front, steering wheel side of the neutral / reverse switch after removal from the steering column. The switch's two functions are actuated when the lever in the column moves the switch lever shown here to different positions as gears are selected.

jim_pivonka_1.jpg
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jim_pivonka_2.jpg
Back of neutral / reverse switch, showing the wiring attachments. Black with red stripe is the backup light wiring, Orange with blue stripe is the neutral safety switch, it prevents starting in gears other than neutral & park.

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