06 silverado service brake system

Good afternoon all. I just finished an install on an 06 Silverado/Duramax. I am using a Viper 5301 and an XK01 in D2D mode. Locks work, remote start works. Remote start is causing a "Service Brake System" message to be displayed in the DIC and a DTC P0650 (Malfunction Indicator Lamp (MIL) Control Circuit Function). I believe the DTC is being thrown due to the low system voltage. There is also a TSB on the "Service Brake System" message that points towards poor grounding/low voltage. So the common theme is low voltage. I have the second ignition hooked up, but not the second accessory (brown wire in the ignition harness). I have the WTS light hooked up and diode isolated. I am using the white tach wire behind the cluster. Has anyone run into any similar issues, and have any suggestions? Remote start works great other than the irritating code... FWIW. Thanks for the help.

how is it that you know this is caused by the remote start?

Regardless of what wires are hooked up and what aren't, the first step will be to put your meter or test light DIRECTLY to the white Ignition 2 wire on the truck, and verify that it gets power during remote start. Again, not a visual inspection, and not a test at the brain of the remote starter. Testing directly at the wire in the truck will give you 100% certainty if it's getting Ignition 2 or not.

@ckeeler The problem did not appear until the RS was installed. It followed immediately. @Chris Will do. I am fairly certain that ignition 2 is powered during remote start, but checking that is easy enough and can't hurt. Do you know if the second accessory wire needs to be powered also? Thanks guys.

I believe i remember a bulletin on this truck stating ones with 4 wheel antilock must have both accessory wires connected(brown and orange) or the brake service light would trigger...Mike M2

Tech Manager

CS Dealer Services

Thanks Mike. I will check that out as well. I was wondering about the 2nd accessory. In fact, I even asked about it here https://www.the12volt.com/installbay/forum_posts.asp~TID~116934~PN~2 You wouldn't happen to know where I could find a copy of that bulletin would you? Chris, It looks like the 2nd ignition is good. I pierced the wire with a test light and hit the RS button. The 2nd ignition is powered the whole time. Also, it looks like my batteries, or at least one of them, are bad. The truck sat all night and remote started fine this morning. I had the doors open for about 30 minutes with the dome lights on, and the batteries are now dead. I have to believe that if the drain was coming from the RS system, it would have drained the batteries overnight. The truck fired right up this morning at 30 degrees F. But, after having the doors open for 30 minutes with the engine off, there was nothing but clicking (actually on this truck it looks more like there is some sort of disco going on in the instrument cluster). Guys, thanks again for the help on this.

We had this happen to us last year as well on the same body style truck and diesel as well. The problem was the bypass module was taking up too much bandwidth on the databus wire and causing dummy lights to turn on ( we had more than just the brake system check ). We had iDatalink look into this and they fixed the problem but in the meantime we used just a Passlock bypass ( without door lock interface ) and this worked liked a charm, no dummy lights ). We reinstalled the module after the new firmware and this worked as well. Just a thought for your issue, try another module that has addressed this problem and it should solve your problem.Jeff

Velocity Custom Home Theater

Mobile Audio/Video Specialist

Morden, Manitoba CANADA

So, what are the odds that calling Xpresskit would yield any results?

50-50. Not sure if they have a firmware for this or not. The one way to figure this out for sure is to get another bypass only module and try it and see if this is the same problem as I had... chances are it is because I've helped quite a few other installer's all over Canada and the US with the same problem or very similiar to this.Jeff

Velocity Custom Home Theater

Mobile Audio/Video Specialist

Morden, Manitoba CANADA