Schematic or high beam trigger for lights?
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Mountain Pass
Joined: Jun 2010
Posts: 185
Likes: 3
From: Scenic Vermont
Schematic or high beam trigger for lights?
If anyone could provide info on where to tap into the high beam hot to use as a trigger for the relay on my spots I would greatly appreciate it. I could obviously do it at the headlight but would much prefer to do it at the box. (NOT the passenger compartment fuse box, the one in the engine compartment.) Many people must have done this, right? I wish that manufacturers wouldn't relegate a simple freaking schematic as some sort of holy grail. It's like a state secret or something. They don't even include a full chassis wiring schematic for cab/chassis upfitters on their owner site. This should be included as very basic and necessary information for anyone who drops too much money on a pickup. (Not that it wasn't money well spent on this most awesome truck.) Jeez, Louise!
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Joined: Jan 2005
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From: BC Canada
Do you have the upfitter switches? For what it's worth, I would directly wire hot to the lights on up fitters and not touch the wiring harness. Especially if you have auto high beam and LED lights. I know that's not necessarily possible on the Supercab, but just saying, I have always done direct wiring via up fitters, and not used the trigger wire. This way you can use as work lights and separately from headlights if ever needed.
Mountain Pass
Joined: Apr 2011
Posts: 167
Likes: 8
In the schematic for the Upfitter relay box is a note that shows a Fuse at F4C and F4A.
Only ONE fuse may be installed. The default is F4A which powers Upfitter switches 5 & 6 in RUN or START. Change the Fuse from F4A to F4C and Upfitter switches 5 & 6 will be powered ALL the time.
Only ONE fuse may be installed. The default is F4A which powers Upfitter switches 5 & 6 in RUN or START. Change the Fuse from F4A to F4C and Upfitter switches 5 & 6 will be powered ALL the time.
Thread Starter
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Mountain Pass
Joined: Jun 2010
Posts: 185
Likes: 3
From: Scenic Vermont
Do you have the upfitter switches? For what it's worth, I would directly wire hot to the lights on up fitters and not touch the wiring harness. Especially if you have auto high beam and LED lights. I know that's not necessarily possible on the Supercab, but just saying, I have always done direct wiring via up fitters, and not used the trigger wire. This way you can use as work lights and separately from headlights if ever needed.
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Mountain Pass
Joined: Jun 2010
Posts: 185
Likes: 3
From: Scenic Vermont
In the schematic for the Upfitter relay box is a note that shows a Fuse at F4C and F4A.
Only ONE fuse may be installed. The default is F4A which powers Upfitter switches 5 & 6 in RUN or START. Change the Fuse from F4A to F4C and Upfitter switches 5 & 6 will be powered ALL the time.
Only ONE fuse may be installed. The default is F4A which powers Upfitter switches 5 & 6 in RUN or START. Change the Fuse from F4A to F4C and Upfitter switches 5 & 6 will be powered ALL the time.
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Mountain Pass
Joined: Jun 2010
Posts: 185
Likes: 3
From: Scenic Vermont
Thanks.
Thanks, I hadn't found this. I'll check it out. Hopefully I can buy and download and not wait for a disk. Thanks again! 👍🏼
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Mountain Pass
Joined: Jun 2010
Posts: 185
Likes: 3
From: Scenic Vermont
Feel like giving it a look? I would appreciate it. It's probably the only time I'll ever have to use a full schematic.
Mountain Pass
Joined: Apr 2011
Posts: 167
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The High Beam wire comes out of the Body Control Module on Pin 11 on a GY-BN wire.
A micro controls this wire so there is nothing upstream to connect to. There are separate wires for each headlight with some types of Headlights, but it appears like 11 is common to all of them.
A micro controls this wire so there is nothing upstream to connect to. There are separate wires for each headlight with some types of Headlights, but it appears like 11 is common to all of them.
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Mountain Pass
Joined: Jun 2010
Posts: 185
Likes: 3
From: Scenic Vermont
Holy smoke. PAPER?!?! REALLY?!?!
I ordered it. I'm getting PAPER schematics! Isn't that the thin, white leafy stuff made out of trees? Really surprising that this isn't available in any digital format whatsoever. The shop manual is available for $177.00 on CD but only includes partial schematics. The multi year collection is available on DVD for over $2K (!!) but you MUST buy the wiring diagram in paper. Strange. At least it was available. And thanks for the tip.
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Mountain Pass
Joined: Jun 2010
Posts: 185
Likes: 3
From: Scenic Vermont
Outstanding!
The High Beam wire comes out of the Body Control Module on Pin 11 on a GY-BN wire.
A micro controls this wire so there is nothing upstream to connect to. There are separate wires for each headlight with some types of Headlights, but it appears like 11 is common to all of them.
A micro controls this wire so there is nothing upstream to connect to. There are separate wires for each headlight with some types of Headlights, but it appears like 11 is common to all of them.
And just to clarify, that's grey /brown from pin 11? Does it suggest it's 12 volt? If not I'll test it. MAJOR help. 
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Mountain Pass
Joined: Jun 2010
Posts: 185
Likes: 3
From: Scenic Vermont
That makes sense. If you had the auto-dim it would be switched upstream of that at the PCM. Perfect.