Reversing Lamp Circuit Trigger?
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Fleet Owner
Joined: Aug 2010
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From: Reynoldsburg, Ohio
Reversing Lamp Circuit Trigger?
2005 E250, 5.4 gas engine................looking for a signal out of the Transmission Range Selector as it runs to the actual tail light housing to illuminate the reversing lamps. By my reckoning the Ford EVTM (Cell 93-1 & -2) the Black /Pink wire should be a positive VDC when the DTR shows reverse---is that correct?
I've tapped into the wiring harness just aft of the B Pillar but have only continuity to ground engine on, engine off and regardless where the shift lever is positioned (P, R, N, D, 2 & 1.)
I'm sure I'm missing something. I'm hoping to have reverse lamp operation trigger a back up camera. (Ecco Gemineye K7000B, already installed and operational apart from having a trigger circuit wired in.)
Thanks for looking--appreciate any help or direction!
I've tapped into the wiring harness just aft of the B Pillar but have only continuity to ground engine on, engine off and regardless where the shift lever is positioned (P, R, N, D, 2 & 1.)
I'm sure I'm missing something. I'm hoping to have reverse lamp operation trigger a back up camera. (Ecco Gemineye K7000B, already installed and operational apart from having a trigger circuit wired in.)
Thanks for looking--appreciate any help or direction!
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From: Virginia
I looked up the diagrams, if you have a torqshift transmission, there is a relay that this circuit goes through located in aux relay box 1. After the relay, it's a conventional black/pink wire going to the lights in the rear.
If you do not have a torqshift trans, the circuit comes directly from the DTR(digital transmission range sensor) and goes to the rear on the black/pink wire.
If you do not have a torqshift trans, the circuit comes directly from the DTR(digital transmission range sensor) and goes to the rear on the black/pink wire.
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Fleet Owner
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From: Reynoldsburg, Ohio
Thanks Franklin1---appreciate the reply! 
I don't have the TorqueShift trans, have tried tapping into the black/pink wire but in-line, not after the bulb in the tail light housing.
No---which did puzzle me since schematically there should be power anywhere along the circuit wire after the DTR. It finally dawned on me maybe I'll get needed + 12VDC by inserting a tap between the reverse lamp lead that is grounded.
When this van was new to me there was an inside cabin audible back up alarm, wired as described above. The alarm wasn't working so I removed it, taped the wire for insulation.
It also dawned on me I have a constant ground from my splice/tap in the wiring harness pre-lamps because I'm seeing a signal through the reverse lamp bulbs to the ground.
I looked up the diagrams, if you have a torqshift transmission, there is a relay that this circuit goes through located in aux relay box 1. After the relay, it's a conventional black/pink wire going to the lights in the rear.
If you do not have a torqshift trans, the circuit comes directly from the DTR(digital transmission range sensor) and goes to the rear on the black/pink wire.
If you do not have a torqshift trans, the circuit comes directly from the DTR(digital transmission range sensor) and goes to the rear on the black/pink wire.
When this van was new to me there was an inside cabin audible back up alarm, wired as described above. The alarm wasn't working so I removed it, taped the wire for insulation.
It also dawned on me I have a constant ground from my splice/tap in the wiring harness pre-lamps because I'm seeing a signal through the reverse lamp bulbs to the ground.
Fleet Owner
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From: 0,0,1
the Black /Pink wire should be a positive VDC when the DTR shows reverse---is that correct?
I've tapped into the wiring harness just aft of the B Pillar but have only continuity to ground engine on, engine off and regardless where the shift lever is positioned (P, R, N, D, 2 & 1.)
I've tapped into the wiring harness just aft of the B Pillar but have only continuity to ground engine on, engine off and regardless where the shift lever is positioned (P, R, N, D, 2 & 1.)
Thread Starter
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Fleet Owner
Joined: Aug 2010
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From: Reynoldsburg, Ohio
What I'm not getting is any voltage at my point of tapping or splicing. The lamps in the tail light housings do come on, go off as I'm shifting in and out of reverse. This is with key on in "run" so all is good there.
Thanks guys for looking in---appreciate the help!
Thanks guys for looking in---appreciate the help!
Fleet Owner
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From: 0,0,1
Then you've tapped into the wrong wire. It might be the right color, but it's still the wrong wire.
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Fleet Owner
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These PDFs show the location and connector face, just so you can verify the correct wire, which is pin 9.
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Fleet Owner
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From: Reynoldsburg, Ohio
I'll split the connector apart and look for voltages relative to the DTR sensor's location.
Thanks!
Hotshot
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From: St Louis
engine off and regardless where the shift lever is positioned (P, R, N, D, 2 & 1.)
I'm sure I'm missing something.
I'm sure I'm missing something.
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Fleet Owner
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From: Reynoldsburg, Ohio
I'll dig into the connector perhaps tomorrow after a bit of work early morning. It'll be interesting seeing which wire color actually comes from C3136. Removing the tail light housing will help too, checking the wire color to the reverse lamp socket(s).
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Fleet Owner
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From: Reynoldsburg, Ohio
Just a quick update----its taken me since Jan 6th to start running this problem down once again.
As it turns out the wire in C3136 Pin 9 is black with a red tracer---when calling for reverse I do have power that's on and off according to the DTR position. Goes to show the EVTM's don't always agree with the actual vehicle.
I did learn to follow the connector pin locations when tracing a wiring issue--color alone might not be 100% accurate.
Thanks to you all for the help, for pointing out what else to check!
As it turns out the wire in C3136 Pin 9 is black with a red tracer---when calling for reverse I do have power that's on and off according to the DTR position. Goes to show the EVTM's don't always agree with the actual vehicle.
I did learn to follow the connector pin locations when tracing a wiring issue--color alone might not be 100% accurate.
Thanks to you all for the help, for pointing out what else to check!
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From: Virginia
So the only discrepancy was the schematic called for a black/pink and you found it was a black/red wire? I can tell you from experience, these wires fade and change colors as they age. It can be very frustrating when troubleshooting. I do not think I have ever found a true white wire in the harness, they always fade to a shade of yellow, especially if it's a white stripe on a darker wire.
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Fleet Owner
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From: Reynoldsburg, Ohio
Definitely a wire color and tracer issue, age itself being the bigger factor rather than exposure to sunlight or other elements. These wires are pretty much totally covered buried behind trim panels etc. Later I'll try viewing these same wires under better light but still knowing some sort of color shift has taken place.
Sadly I assumed a black/pink wire wouldn't be in the same bundle as a black/red wire so that's on me.
So the lessons learned were: 1) Trace wire colors under good lighting & 2) Check connector locations first.
Thanks again Franklin2 and everyone else for their help here!
Sadly I assumed a black/pink wire wouldn't be in the same bundle as a black/red wire so that's on me.
So the lessons learned were: 1) Trace wire colors under good lighting & 2) Check connector locations first.
Thanks again Franklin2 and everyone else for their help here!
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