Duramax Diesels Forum Truck of the Week
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Old 05-20-2018, 09:54 AM
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DAVe3283 DAVe3283 is offline
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Default Retained Accessory Power (RAP)

I wanted to get a high-amp Retained Accessory Power (RAP) source in the least ghetto method possible. I searched around online, and couldn't find a good guide, but I eventually figured out this method.

This replicates how GM supplies RAP to the sunroof. If you have a sunroof already, you will be able to splice in to the factory relay output and be done! See the attached schematic.

First, ensure your vehicle has the Sunroof fuse in the underhood fuse block!
Sunroof Fuse.jpg
Both my 2003's have it, despite not having a sunroof.

Tools & Parts Needed
  • Connector: 12193929 (OEM part, green color) or 12193930 (black equivalent)
    • If you have roof marker lights, you should already have this connector and can just add pins to it!
    • These are hard to find, but I have a bag of the black ones. If you need one, PM me. Or raid a junkyard, all the colors should interchange.
  • Terminals: 12129424 (3 needed)
    • Mouser electronics and Amazon carry these
  • Terminal crimper (or go nuts with some pliers)
  • Universal relay & relay socket
    • You can also use a GM relay & socket out of a junkyard
Locating the Connector
The connector we need is C6 in the Right IP Fuse Block.
Fuse Block Right IP Location.jpg

Pinouts
Fuse Block Right IP Top View.gifC6.gif
Fuse Block Right IP C6 Pinout.pdf

We only care about pins A, C, & D.
  • Pin A to relay pin 30
    • This is battery power from the sunroof fuse
  • Pin C* to relay pin 86
    • This is a ground for the relay
  • Pin D to relay pin 85
    • This is the RAP trigger from the body computer to the relay coil
*Pin C will have a wire in it already if you have roof marker lights. If so, remove that pin from the connector, and cut off the existing connector, & crimp that wire into the relay ground too. You can see where I did this in the photos below.
*If you need a ground for your accessories, you can add another ground wire here too, though it gets harder to crimp with more wires. I just grounded my toys elsewhere.

Fuse Block Right IP C6.jpgRelay & socket.jpg

Install the new relay
Right A-Pillar-Middle(c).gif
I installed the relay in the factory location (#2 in the diagram above). It gets taped to the roof marker harness (if you have one) and simply tucked up along the A-pillar beside the glove box.

You can now attach your accessories to pin 87 on the relay, and they will turn on/off with the RAP circuit! You might consider changing the Sunroof fuse from 25A to something smaller that matches your needs better.
Attached Images
File Type: jpg Power Sunroof Schematic.jpg (154.6 KB, 17 views)
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Old 05-20-2018, 09:15 PM
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Dave, you have any idea how to fix the corrupt coding for RAP on the 01-02 trucks when you flash a DSP OS in? Iíve been on single tunes since 2012 and it would be nice to have that back consistently, not when it feels like working.
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BIG THANKS TO: Mike L, Steve, Trent, Guy, Dan, Ruben, Josh H, Scott, Brian and everyone else who has put a hand in to help me.

best time to date: 12.39

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Old 05-20-2018, 09:53 PM
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Quote:
Originally Posted by Chevy1925 View Post
Dave, you have any idea how to fix the corrupt coding for RAP on the 01-02 trucks when you flash a DSP OS in? Iíve been on single tunes since 2012 and it would be nice to have that back consistently, not when it feels like working.
DSPís are for girls
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Old 05-20-2018, 11:21 PM
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Quote:
Originally Posted by Chevy1925 View Post
Dave, you have any idea how to fix the corrupt coding for RAP on the 01-02 trucks when you flash a DSP OS in? Iíve been on single tunes since 2012 and it would be nice to have that back consistently, not when it feels like working.
I'll have to troll through Techline tomorrow and see what I can find. On the 2003+ you'd just reflash the BCM with the stock program again to fix any corruption, but I'll see if anything different jumps out at me for the 2001-2002.
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Originally Posted by gmduramax View Post
DSPís are for girls
Yeah, I still have a DSP switch wired in to my truck, but switched back to a single OS when I built the motor. Why not tow on a 660 HP tune? I think James agrees with me there too, only more so.

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Old 05-21-2018, 07:10 AM
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Originally Posted by gmduramax View Post
DSPís are for girls


Quote:
Originally Posted by DAVe3283 View Post
I'll have to troll through Techline tomorrow and see what I can find. On the 2003+ you'd just reflash the BCM with the stock program again to fix any corruption, but I'll see if anything different jumps out at me for the 2001-2002.Yeah, I still have a DSP switch wired in to my truck, but switched back to a single OS when I built the motor. Why not tow on a 660 HP tune? I think James agrees with me there too, only more so.

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couldnt agree more Dave
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Originally Posted by JoshH View Post
Mike L is my role model. I want to be like him when I grow up.
James

02 LL7 2500HD CC/LB dmax/alli "The Limo"

BIG THANKS TO: Mike L, Steve, Trent, Guy, Dan, Ruben, Josh H, Scott, Brian and everyone else who has put a hand in to help me.

best time to date: 12.39

motor died/bent rods = 3/11/11
back from the dead 7:04pm 4/9/2012

Limo is back in the garage, now driving a built chevy tracker
Tailgate Crew Member #4
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Old 05-21-2018, 04:19 PM
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DAVe3283 DAVe3283 is offline
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The 2001-2002 uses external relays instead of data bus messages for most of the RAP features, but it is all still controlled by the BCM. I attached the diagnostics I found.

Really, it looks like the best bet is verify the door switches are all working, the ignition switch isn't flaky, and then reflash the BCM with the stock calibration and see what happens. That's what I'd do. You can also command the RAP relay on if you happen to catch it when it isn't working, and that will tell you if it is a programming glitch or hardware problem.
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Old 05-21-2018, 05:26 PM
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Chevy1925 Chevy1925 is offline
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You the man dave. Iíll play with it. The RAP either works or doesnít. When it doesnít, the radio and everything shuts off soon as you kill the ignition and never have touched the doors. Started right after I did the dsp flash. Ferm was saying when you flash the dsp os in, it corrupts some part of the bcm and makes it sporadic.
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Originally Posted by JoshH View Post
Mike L is my role model. I want to be like him when I grow up.
James

02 LL7 2500HD CC/LB dmax/alli "The Limo"

BIG THANKS TO: Mike L, Steve, Trent, Guy, Dan, Ruben, Josh H, Scott, Brian and everyone else who has put a hand in to help me.

best time to date: 12.39

motor died/bent rods = 3/11/11
back from the dead 7:04pm 4/9/2012

Limo is back in the garage, now driving a built chevy tracker
Tailgate Crew Member #4
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