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How to bypass some of the features

I had this stereo installed, and different options that I was told it had were not available unless the E Brake was engaged, when I asked about it I was told for $100.00 they could bypass everything so that all the functions would work all the time. Is there any way that I can do it myself without giving them the $100.00, since they didn't mention any of that before the system was purchased and installed. Thank You.

It is a Pioneer Premier AVIC-F90BT

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Don't let them rip you off for $100 - all they're doing is changing the spot that they connect one harness wire into the car:)

DVD head units have one extra wire in their wiring harnesses, compared to a standard CD head unit. On mine, it's a peach-colored wire, and is the activation wire for the DVD feature. During the installation, the instructions call for this wire to be tapped into the emergency brake indicator light wire. The reason is this:

The e-brake indicator light is what is called a "ground complete" circuit. That means that the bulb always has power applied, but when you pull the brake, that puts a ground to the wire and completes the circuit, allowing it to illuminate. The head unit sees this ground, and activates the DVD player.

In my Jensen unit, I simply ran this wire to a ground (I used a screw near the fuse box), and I put a switch on the wire, so I could break the ground contact at will. Jensen calls for a procedure to activate DVD playback. In their instructions, they tell you to select DVD from the option menu, and when the "lawyer screen" comes up (the one warning you to park before you watch a movie), you release the e-brake for 3-5 seconds, and then reapply it. To simulate that with the switch I used, I leave the switch closed (activated), and select DVD. Then I flip the switch "off" for 3-5 seconds, and flip it back "on". This tricks the head unit into thinking I put the e-brake off for a few seconds and then put it back on, and the movie will start. Then I can drive away.

Basically, ground the wire that is used for DVD activation, and put a switch inline on it. Then you can break and reapply the ground in whatever manner is required by the manufacturer of your head unit. If there is no off/on sequence with yours, as there is with mine, simply ground the wire to a screw inside the dashboard and you're done.

Posted on Jul 23, 2008

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