2009 Forester Auto- NonNavigation Reverse wire

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Cervera
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2009 Forester Auto- NonNavigation Reverse wire

Post by Cervera »

I've done many radios in the past along with remote starters etc so pretty okay with this stuff but I'm stumped...I went to install a Pioneer- Avh-4201nex on our 09 Forester along with a Pioneer Backup Camera (ND-BC8) using a maestro rr and SU T-harness. Everything looked good but the radio's screen would not flip over(trigger) to the reverse camera screen when putting the car in reverse. I did connect the purple/white wire from the hu to the purple/white wire on the SU T-harness. Is there anything else I have to do? Do I need to tap any wires from the kick panel or should I be receiving the reverse trigger from the t-harness which is connected to the factory radio harness? I did set the radios setup menu for the camera to detect on +. so the radio should be trying to detect it correctly.

I assume the camera's power/ground do not have to be connected in order for the radio to be triggered into the reverse camera screen, I should just get a black screen....correct?

I see also that the obd connector has a purple/white wire with a pinkish connector....does that have to be connected anywhere? It says it's for a manual transmission but my car is automatic.

I ran out of time so couldn't take out my multimeter to troubleshoot but will continue it soon and looking for ideas......

I also assume I can feed some 12v power to the reverse wire on the radio and see if it triggers the screen to change and that would rule out a defective radio..... correct?

Any help/ideas are greatly appreciated!!

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JustinFerroni
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Re: 2009 Forester Auto- NonNavigation Reverse wire

Post by JustinFerroni »

looks like you are on the right path. before we start heading down the wrong rabbit hole let us know what you find with your meter on the purple/white. Thanks!
Justin Ferroni
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Cervera
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Re: 2009 Forester Auto- NonNavigation Reverse wire

Post by Cervera »

So finally got a few minutes to test it. I disconnected the purple/white wire between the t-harness and the pioneer radio harness. When testing the purple/white wire coming from the T-harness which is connected to the maestro and the car harness, it is always hot even when the car is off! Should this be happening? I thought that cable was supposed to be only hot while in reverse?


Thank you!

Chris LaRoche
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Re: 2009 Forester Auto- NonNavigation Reverse wire

Post by Chris LaRoche »

Something is off, if the radio isn't switching to the camera input and that wire is 12v all the time.

What was the NDBC8 connected to for power/ground? When we say the wire is 'hot', do we mean physically hot...or are we reading some level of voltage?
Chris LaRoche
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Cervera
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Re: 2009 Forester Auto- NonNavigation Reverse wire

Post by Cervera »

I need to reset the radio. It’s stuck on rear camera mode when booting up now.

I have not connected the power or ground on the camera yet, I’m first trying to get the radio to trigger when in reverse. Ie change to the camera mode when in reverse.

My concern is why does the purple white cable always have voltage? Even when the car is off. Can something be wrong with the maestro? I plan on resetting it and reflashing it to see if it clears any thing out. It’s a big mystery to me so far.

Chris LaRoche
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Re: 2009 Forester Auto- NonNavigation Reverse wire

Post by Chris LaRoche »

Purple/white should not have power with the car off, or unless the car is in reverse. What are you seeing, as far as voltage?
Chris LaRoche
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Cervera
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Re: 2009 Forester Auto- NonNavigation Reverse wire

Post by Cervera »

I have the system working now. I ended up disconnecting the purple/white wire from the T-harness and the Pioneer radio harness. I then just tapped the reverse wire on the car and connected it to the reverse wire on the Pioneer radio harness. Basically bypassing the maestro for the reverse functionality. Not the best solution, but it works.

For some reason, the purple/white wire from the maestro always shows voltage (12+) when the car is on so maybe the maestro is defective. The warranty is expired (Purchased I believe in 2019, over 18 months ago) so out of luck on that part.

Will having that purple/white wire on the maestro always live(showing voltage) harm anything? I have capped it.

Thanks!

Chris LaRoche
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Re: 2009 Forester Auto- NonNavigation Reverse wire

Post by Chris LaRoche »

No issues there. What typically happens is if a camera is wired on to the purple/white (or it's grounded), the transistor that controls this output fails and outputs all the time like this. Capping it off will be fine.
Chris LaRoche
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Cervera
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Re: 2009 Forester Auto- NonNavigation Reverse wire

Post by Cervera »

I have to double-check if the purple/white wire has voltage while the car is off. It definitely has it when the car is on and in park.

Chris LaRoche
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Re: 2009 Forester Auto- NonNavigation Reverse wire

Post by Chris LaRoche »

I can't recall, but feel like it drops out with IGN off. But either way, with it not being supplied a trigger to turn on, just internally it's "shorted" to this condition if this did happen. With nothing connected to it, being capped off, it won't cause any issues.
Chris LaRoche
Automotive Data Solutions
Technical Support - Maestro
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