ESMD

Did you recently have the engine block heater replaced under the recall? Apparently, to do so, they have to drain the coolant. When I had mine done two weeks ago, I drove it home with no problems. The next day, got a low coolant warning. When I called the dealer, they told me sometimes when the refill the coolant, they force feed it in and the level can be off, or something like that! They gave me a gallon to put in and I topped off the tank. No problems since.

I had the same issue, wanted the LEDs in the mirror to activate automatically when putting the truck in reverse, but didn't want to get blinded in the face when I unlocked the truck at night. My solution was to install a relay. The relay is energized when the truck is running, deactivated when the truck is off. The coil on the relay is wired to terminal on the fuse block that changes the cigarette lighter plugs from batt to acc mode. The "jumper" between the white and brown plugs on the BCM are wired back to the relay to make/break the jumper. Truck is on - mirror LEDs follow the backup lights and/or cargo light switch Truck is off - mirror LEDs only follow the cargo light switch.

My wife drives a Ford F250 and my Chevy is parked right next to it. I had a bird make a nest in my rear bumper, didn't even go for the Ford!

It appears the updated module (version 3.0) has come out for the 2017 and up trucks. I was wondering if anyone has installed this updated one in their truck and what do you think? There appears to be a huge difference between the 2.0 and 3.0 versions in how they connect to the truck. The 2.0 being a direct plug-in to the OBD-II connector, the 3.0 being an in-line connection with three harnesses of the BCM. What worries me is that direct connection to the BCM - and the warning in the Speed Turtle instruction manual, "The use of the EFM 3.0 may shorten the life of the vehicle’s light bulbs, headlight assemblies, and electronic modules." I don't mind with playing around with most things on the truck, but I've always tread lightly around the BCM. Not exactly an inexpensive part to mess around with! So I guess the big question is, could the 3.0 module really cause damage to the BCM, connected up they way it's described?

Yeah, I haven't quite figured out what my truck is thinking. If I start the truck, leave it in Park, press (and hold) the button to turn the lights on, nothing. Put it in gear, press (and hold) the button, lights turn on. Then I put it in Park, thinking the lights will turn off automatically, they stay on. From there, I can turn them on and off at will with no problems, regardless of what gear it's in. Consequently, if I start the truck, leave it in Park, turn on the headlights manually, press (and hold) the button, lights turn on! So I don't know if it's a bug in the BCM or maybe a programming change when my truck was built, but trying it several times yields the same results. Just a a precaution, I triple checked all the connections both at the headlight switch and BCM and they are all where they are supposed to be. Again, works fine for me so I have no complaints!

Set the parking brake and put the truck in Neutral.

Installed my switch and harness this evening and noticed two things: 1.) Switch doesn't activate when in Park. Truck has to be out of Park in order for the switch to work. 2.) Switch will also turn the headlights and parking lights on too, just like if you press the fog light button. Overall, I'm happy with it. The instructions were perfect and it was great having the pre-made harness. On a side note, I do have an extra switch (blue color) because I accidentally ordered two. I did plug it in and test it and it does work. If anyone is looking for one, send me a PM.

The blue switch (left one) has the icon for "Rear Fog Light" where as the red switch (right one) has the icon for an "Off Road Light". Maybe the left switch is shared with another GM model or used on a European model? A Saab I had years ago had the same icon as the blue switch, basically a fog light icon (except the beams were pointing to the right and horizontal, as opposed to pointing to the left and at a slight down angle). When I would press that button, it would illuminate a bright red light at the rear of the vehicle on the left side, same intensity as a brake light but not the same bulb as the brake or turn signal. If you are ever driving down the road and see someone who looks like they are riding their brakes and have one light out, it's probably a rear fog light. Some vehicles use two lights, others use only one on the "passing" side of the vehicle. Rear fog lights are common on European vehicles I believe.