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Wireless front parking camera with monitor for front bumper protection
- Thread starter artsci
- Start date
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- Model S User Interface
To remove the big one you have to remove all of the smaller ones first. A real PIA. I'd keep probing the footwell wiring -- it would be a much better solution.
About to call it a day and start putting things back together. I probed for a few hours. No luck. Beginning to wonder if they switch using linbus or canbus rather than by supplying 12 volts.
Well things went back together okay. Unfortunately my quest was unsuccessful and I did not learn much other than how to open up the wrong part of the car.
So this is what I am thinking:
1) Although I cannot be 100% sure, as I might have missed a wire in the harness, it seems like the reverse light power is not provided as switched power down a wire. Measuring is a PIA as I had to make sure I made contact with my multimeter and then push the brake pedal and shift to reverse for each measurement. The bundle is tight and even though I stripped some of the insulation tape the inner wires were tough to get at.
2) My guess is that a lin bus is used to signal the tail light electronics to turn on the reverse light.
3) As Artsci said getting at the tail light in the tailgate looks like a real PIA. I do not feel comfortable attempting it.
I am really hope that there is an easier way to detect the reverse light than opening up the hatch and either installing a remote transmitter or running wiring. That is no DIY job. Monitoring the Lin bus using a micro is another option but that is a whole new engineering exercise and assumes that a Lin bus is being used in the first place.
I think we need expert advice. Ideally from an installer who has experience detecting reverse for rear parking assist.
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If your installer will share his secret it would be really helpful! Please see the latest posts.
So this is what I am thinking:
1) Although I cannot be 100% sure, as I might have missed a wire in the harness, it seems like the reverse light power is not provided as switched power down a wire. Measuring is a PIA as I had to make sure I made contact with my multimeter and then push the brake pedal and shift to reverse for each measurement. The bundle is tight and even though I stripped some of the insulation tape the inner wires were tough to get at.
2) My guess is that a lin bus is used to signal the tail light electronics to turn on the reverse light.
3) As Artsci said getting at the tail light in the tailgate looks like a real PIA. I do not feel comfortable attempting it.
I am really hope that there is an easier way to detect the reverse light than opening up the hatch and either installing a remote transmitter or running wiring. That is no DIY job. Monitoring the Lin bus using a micro is another option but that is a whole new engineering exercise and assumes that a Lin bus is being used in the first place.
I think we need expert advice. Ideally from an installer who has experience detecting reverse for rear parking assist.
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If your installer will share his secret it would be really helpful! Please see the latest posts.
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Was busy in the OR all day. Will contact Sound in Motion tomorrow. WhiteP85, where in Mass are you.....May be helpful for the guys at SIM to show you the wire tap in person, they are located in Brighton...great guys and. I am sure they would be happy to help and possible do installs for local owners who may not want to do this as a DIY.
Shipped the beta front license plate camera mount off to WhiteP85 today. As I have no front plate my hope is that he can successfully test it so we can put them into production for the folks who have a front plate and want the front camera. Plans now are that the mount will be a kit option.
I also tested this harness for a reverse signal (to silence front parking sensors while in reverse) a few months back. While I'm not 100% sure I got every pin, I couldn't find the one I wanted.
I only tested the driver side, the two huge connectors near the floor. As you noted, it's a real pain to test it as you have to have a connection and then turn the car on, press the brake pedal and set reverse for each test. Perhaps with two people it would go far faster. I haven't pulled apart the passenger side yet, but I think another harness might have it. Another project!
Seams to me (from this picture) that the wire harnest in the right side of the car is the one going to the rear (left on picture) - the wires in the left side seams to go to the front and back seats among other.
some wires seams to cross side in the midle of th car.
(picture is seen from infront of car)
side note: I belive minor difference exist between EU vs. US cars. EU cars does only have one reverse light - the US car have 2 reverse lights, right ?
some wires seams to cross side in the midle of th car.
(picture is seen from infront of car)
side note: I belive minor difference exist between EU vs. US cars. EU cars does only have one reverse light - the US car have 2 reverse lights, right ?
JerryNycom
Member
I can't answer for EU cars, but yes, US cars have two reverse lights. If EU cars have a single reverse light, is this a EU requirement?
Looking at this photo it may be that removing the rear seat (which is pretty easy to do) might expose the harness to the tail lights. That may enable some further testing.
The trunk lid has 2 wire rubber harnest going from the car in each side - afaik (guess) the left side (drivers) is where the reverse cams data + some other black wires goes (posible power).
The right side have alle the nice colored wires.
I just did som wire testing using a induction meter 1 wire at a time (not exact)
I did not measure all wires, but I got a clear signal on the Green/Brown wire when setting the car in reverse - this could indicate that a green/brown wire is used by the reverse light. other wires I mesured did not give a current indication - the white/blue did have some current while pressing the breake so posible this is the break light.
If someone is checking wires up front in the car, please messure a wire with green/brown color extra carefull.
this is the wire Im refering to:
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I guess Tesla might try follow some sort of a standard....
BS-AU7a 1983 Colour Code for Vehicle Wiring, from the British Standards Institution
acording to this green/brown is reverse light as well.
The right side have alle the nice colored wires.
I just did som wire testing using a induction meter 1 wire at a time (not exact)
I did not measure all wires, but I got a clear signal on the Green/Brown wire when setting the car in reverse - this could indicate that a green/brown wire is used by the reverse light. other wires I mesured did not give a current indication - the white/blue did have some current while pressing the breake so posible this is the break light.
If someone is checking wires up front in the car, please messure a wire with green/brown color extra carefull.
this is the wire Im refering to:
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I guess Tesla might try follow some sort of a standard....
BS-AU7a 1983 Colour Code for Vehicle Wiring, from the British Standards Institution
acording to this green/brown is reverse light as well.
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Hi Folks,
Been away for the last week so sorry about the silence. I am also off to CES show today through the weekend so I am afraid I will not have much Tesla time. Not much of an update on my side. The bracket Artsci sent has arrived but I have not had time to test it. I am still waiting for the latest set of PCBs.
Great feedback on the wiring. I will dig in more deeply when I get back.
Best,
WhiteP85
Been away for the last week so sorry about the silence. I am also off to CES show today through the weekend so I am afraid I will not have much Tesla time. Not much of an update on my side. The bracket Artsci sent has arrived but I have not had time to test it. I am still waiting for the latest set of PCBs.
Great feedback on the wiring. I will dig in more deeply when I get back.
Best,
WhiteP85
I spoke with my installer today who did the rear parking sensors. He tapped the rear backup light wire to engage the rear sensors. He said it was a purple wire with green stripe that is most easily tapped behind the rear passenger side C pillar near the rear seat latch. He just pried up the trim piece to access the wire as seat removal and reinsertion can be tricky with regards to the clips according to him. Unfortunately, he didn't have any pictures. Hope that is of some help.
I have been back to the car to meassure any current changes in this purple/green wire - but could not see any changes while switching my reverse light on/off - still measure only induction, so its not exact but will normaly give a good indication..
My car is a EU car produced in October 2013 - My car does only have 1 (single) white reverse tail light in the right side - it is posible that the US version have a different wiring - or tesla may have made a different wiring/colors for later VIN's - hint the missing 12 V permanent power supply in the roof in newer cars.
My car is a EU car produced in October 2013 - My car does only have 1 (single) white reverse tail light in the right side - it is posible that the US version have a different wiring - or tesla may have made a different wiring/colors for later VIN's - hint the missing 12 V permanent power supply in the roof in newer cars.
On the passenger side there is one bundle going to the back of the car. It splits at the front-bottom into a connector with 8 wires, and the rest go up somewhere else (no easily visible connector). Of the 8 wires, two are green/black, two are green, and one purple/black, one purple, one blue/black and one blue. While hard to tell, I didn't see any Green/Brown or Purple/Green wires in either bundle.
I tested all the greens and the purple/black and didn't see any change going from Off-On-Reverse-Drive-Park on each wire. While fairly easy to get to, it's a pain to close the door run around to the drivers side and go through the operations for each wire test. I'm about 95% sure I had a good connection (but not 100%) on each test. Usually you'd get a few millivolts when you had a good connection.
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My last post wasn't clear, but this was tested at the front pillar, not the rear C-pillar area as suggested by nkohlimd's installer.
I tested all the greens and the purple/black and didn't see any change going from Off-On-Reverse-Drive-Park on each wire. While fairly easy to get to, it's a pain to close the door run around to the drivers side and go through the operations for each wire test. I'm about 95% sure I had a good connection (but not 100%) on each test. Usually you'd get a few millivolts when you had a good connection.
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My last post wasn't clear, but this was tested at the front pillar, not the rear C-pillar area as suggested by nkohlimd's installer.
another "maybe usefull" information.
acording to this
http://geremology.com/files/Tesla%20Model%20S%20Tips%20and%20Tricks%20010514.pdf
on page 7 they claim cornering lights are switched on when in reverse - if not posible to find a wire for the reverse light, it might be posible to find both wires for the cornering light and make a "AND" input from those 2.
I haven''t veryfyedd this my self, and it is posible that future SW may change this behavier.
acording to this
http://geremology.com/files/Tesla%20Model%20S%20Tips%20and%20Tricks%20010514.pdf
on page 7 they claim cornering lights are switched on when in reverse - if not posible to find a wire for the reverse light, it might be posible to find both wires for the cornering light and make a "AND" input from those 2.
I haven''t veryfyedd this my self, and it is posible that future SW may change this behavier.
ken830
Model S 85, Model 3 Performance, Model X LongRange
