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Old 05-29-2014, 01:33 PM   #31
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The Sienna tow package does not include a 7 pin connector, in fact, unless I'm wrong, it does not include wiring for even a 4 pin connector, although there is a harness available that provides 4 pin wiring.

If you have a 7 pin connector (necessary for both brakes & 12V power to the trailer), it must have been a user add on. The best way to tell if they included a solenoid to cut off power when the engine is stopped it to check the voltage between pins 1 (Ground) & 4 (12V Battery). If you measure 12V with the ignition off, no solenoid, if it goes off when the ignition is switched off, you have one.

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Old 05-29-2014, 06:50 PM   #32
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I believe that mine came with a 4 pin connector along with the hitch that had a 1 1/4" receiver. There was no included information regarding the hook-up. I added the 7 pin wiring along with a new hitch only because I needed the WDH and at the time (and maybe even now), there was no WDH that worked with that size receiver.

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Old 05-29-2014, 07:57 PM   #33
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Originally Posted by Sandra L View Post
I do not know if I have this cut-off feature on my 2005 Sienna w/tow package. Will I need to contact Toyota to find out?
Toyota does not offer pre-wiring for any trailer feature on the Sienna (lights, brake control, or battery charging). The factory-installed "towing preparation package" is all durability features (mostly transmission cooling on the 2005), while dealer-installed (or port-installed) accessories include a hitch and a trailer lights wiring package. The wiring package doesn't have any brake control or battery-charging features at all, so if you have either of those they were a custom installation - Toyota won't know anything about any custom installation which may have been done.

My 2004 Sienna's trailer lights wiring package is the dealer-installed accessory. I added trailer brake control and trailer battery charge wiring myself, and I did include an isolation (cut-off) relay so the van and trailer batteries are only connected when the van's engine is running.
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Old 05-29-2014, 08:00 PM   #34
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Sorry, I posted the above before seeing the last page of posts. I agree with Jon's comments, and Sandra's 4-pin connector and 1-1/4" hitch receiver (and the lack of information) are typical of the dealer-installed accessories.

As far as I know, WD hardware continues to be available only for 2" (or larger) receivers.
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Old 05-31-2014, 12:36 AM   #35
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Liz and I headed out to Escape today and signed off on the Build Sheet. Thanks to everyone for your comments and interest. Our build sheet changed because of your help.

I'm still confused about the isolator switch. But it occurs to me that questions like this are why I am happy one of my son-in-laws is a licensed mechanic. I'll ask him what I need.

Thanks again. Larry
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Old 05-31-2014, 08:17 AM   #36
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The "isolated" electrical circuit is in the tow vehicle. If the TV does not have a towing package a 12V circuit is added to provide voltage to the trailer (pin 4). A solenoid or relay is turned on or off using voltage from the ignition switch. When the ignition switch is in the on position the solenoid or relay is energized and allows voltage to pass through it. When the ignition switch is off the relay or solenoid is not energized. The purpose is to keep the tow vehicles battery from being depleted by the trailer.
There are different wiring options depending on how your vehicle is equipped.

"Never argue with an idiot. They only bring you down to their level and beat you with experience." George Carlin
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