Diesail

Yes, they added a pine cone type fastener to the cover in '09. Anybody that has an '08 knows they had a habit of falling off. The pine cones can be a real pain to get out. They do simply pull out though. You can get a trim panel removal tool at an autopart store, I have always been able to lift them a little with a small pry bar or screw driver then get under them with a pair of needle nose pliers and grip and pry.

Yep, any standard bosch style relay will work just fine.

Yep

Just rotated my tires yesterday, here are the steps I took 1) Got in the truck and set the parking brake. 2) Turned the key on, yes on and not running. Repeat, not the accessory position. 3) Pushed and held the lock and unlock buttons on the FOB until the horn beeped twice. 4) Stepped out and went to the driver's side front and using the end of a tire gauge deflated the front tire until the horn beeped. 5) Moved to passenger side front and repeated, then passenger rear and finally driver's rear. After the last tire it beeps twice. 6) Went back around and deflated or inflated accordingly. One observation I did make, I have a 2500HD and tires are 80 rear and 60 front. The tires with 80 PSI deflated much faster and it took just a few seconds get a beep. The tires at 60 took MUCH longer to get the beep, so at the lower pressure of a 1500 I would think it would take even longer. Also you have a 2 minute limit per tire so that is why I think it much easier to deflate then to inflate as you can move around the truck faster.

They are located in the underhood fuse block. They 15 amp circuit is labeled SEO B1 and the 30 amp fuse is SEO B2.

I think it works great. I do the key fob thing and make a quick lap around DEFLATING each tire until I get the beep. Now that it has learned I make one more lap and adjust them to there correct PSI. Couldn't be easier IMO.

Glad to hear it worked out for you. When doing this sorta project a test, whether a simple lamp or a multi-meter, is key. Being able to test along the whole circuit for voltage can save a lot of time and hair.

Sounds like it is time to break out the test lamp or meter and start checking where you have power. The blue wire should have power ALL the time. If there is no power then you blew fuse or have the wrong pin. The Wite wire should only have power when RAP is pressent. But becare not to connect anything more than a meter, test light or relay to this pin as you can do damage if you overload it. Then check your ground wire as well as the output of the relay.

I used a relay with a mounting tab and simply ran a wire tie through the tab and around one of the larger wire bundles up and under the dash.

For the price of them I simply bought ten for the same reason.

Without seeing the directions for your monitors I would guess that the black wire is ground. If so then no, only the red wire to yellow. Also anything connected to the circuit should be fused.

It lists for only $12.10 and I almost ordered it from GMParts direct but with there shipping price went up to $24 bucks. Since I hadn't made it to my dealer to order and I needed to get the project done I elected to finish without it. I may order one next time I'm in the dealer and peel the heat shrink and install it just to make it look a little more complete. The connector comes with only a single wire in the ground positions so you still need the other parts.

The two circuits outlined are part of the provisions for upfitters and are already fused at the 15 and 30 amps described. In my installation the output from the relay feeds an accessory fuse block giving me four fuse locations with a total of 15 amps available. Currently I am powering two items, a GPS and a cigarette lighter output that is RAP instead of always on.

The question of where to locate RAP (Retained Accessory Power) on the NBS trucks seems to come up often so I thought I would post this info for everybody. RAP is available to us in the MBEC (Mid-Bussed Electrical Connector) located behind the instrument panel to the left of the brake pedal. The MBEC has 10 positions and the one we are going to us is X14. The problem is that RAP here is limited to only 300 milliamps but there are two other battery feeds in the location as well, one is 15 amps and the other 30. So to use the RAP power for anything but the smallest loads is going to require a relay. Here are the parts you are going to need and the source that I purchased them from but they are available from many other sources as well. 3 Female GT 280 terminals Delphi Part number 15304711 Mouser part number 829-15304711 1 Relay pigtail Parts express part number 330-075 1 Bosch style relay Parts express part# 330-079 1 GM Connector 20791502 (optional) Here is the relay harness, relay and connectors. This image has been resized. Click this bar to view the full image. The original image is 800x471 pixels and 37KB in size. There are 5 wires in the harness connected as follows. White wire – Relay trigger positive – relay pin 85 Black wire – Relay trigger ground – relay pin 86 Blue – Constant 12v source – relay pin 30 Yellow – NO (normally open) circuit – relay pin 87 Red – relay pin 87a, this wire is not used and needs to be removed. You will need to install the female terminals on the white, black and blue wires. Since I elected not to spend money for the GM Connector I went ahead and covered my connectors with shrink wrap. I may still pickup the connector but needed to get this done and hadn’t had a chance to get to the dealer and didn’t want to pay GMPartsDirect their freight charges. Here are my finished cable ends. This image has been resized. Click this bar to view the full image. The original image is 1024x833 pixels and 54KB in size. Remove the cover to the MBEC, it looks like this This image has been resized. Click this bar to view the full image. The original image is 761x508 pixels and 43KB in size. Here is a diagram of the MBEC connectors; we need to use X14 A close-up of X14 The connections will be as follows White wire to Pin 8 - RAP feed Black wire to Pin 1 - Ground Blue wire to Pin 2 or Pin 5. Pin 2 has 15 amps which was plenty for my needs. Pin 5 has 30 amps. - Battery feed The remaining yellow wire will feed your accessories. Enjoy….