H3 Remote start

[Romeo]

For the past 6-8 months my remote start was not working. As I would try to start it using the remote the truck would try to start then fail and the alarm goes off. If was having misfire issues during this time as well. I noticed when I changed all my spark plugs with OEM AC Delco and installed Supermodulation Super Sparxx the misfires went away. One day I unintentionally remote started the truck after fixing the misfire and it worked just fine but the alarm still came on for a couple minutes then shut off again. Yesterday it was cold out and i decided to remote start the truck; it started fine but the alarm came on for a couple of minutes again then shut off all while the truck was still started. Then when I started driving I noticed this icon on the dash (see pic). The icon looks to be an alarm icon I'm assuming and as I tried to unlock or lock the truck it stayed on.Any insight on this? ----- On a side note my alarm isn't working properly and seems to be stuck in valet mode and can't get it off, the red alarm button thingy by the steering wheel is also stuck and not sure how to get my alarm to work again.

 

[Ghostbuster]

hmmm I say take it off and live without remote start. Or pay the big bucks and have someone do it right.

 

[steelcityk9cop]

Are you noticing the same issue with a key start at all? At times will it "misfire" and fail to start for 10 minutes with the security light on? If so it's a bum ignition cylinder.

Sent from my KFTT using Tapatalk

 

[Humvdood]

Hello, I've posted a few times regarding remote starts for H3s.
Hummers are one of the harder installs because the passlock system is a multiplex circuit.
I can't really troubleshoot from all the way down here in Texas but it sounds like a short if you're getting these type of issues.
Before you go do any of this - if you're not at all confident in your tech saaviness take it to a car alarm shop.
That being said, the immobilizer bypass units on these cars don't hold up. I tried 3 different bypasses on mine and they all crapped out - I ended up using 2 relays and a resistor instead of the bypass and have had zero issues since.
You could just do a relearn on the bypass module for starters. If you look wherever your control units are - the bypass will usually be the smaller black box. Depending on the brand there will be a process you'll have to go through. If you have trouble locating instructions let me know and I'll look up the procedures.
Check your grounds. Look where wires from the modules are grounded out at the chasis and make sure they are making contact.
Check the fuses on the remote start system itself. There are usually four of them and maybe one on the bypass module. Make sure they are seated well.

 

[Romeo]

Nope, key ignition is fine. Today again when I remote started the light stayed on. I turned it off and started with the key the light went off. No missfires since I changed plugs.

 

[Romeo]

Are you noticing the same issue with a key start at all? At times will it "misfire" and fail to start for 10 minutes with the security light on? If so it's a bum ignition cylinder.

Sent from my KFTT using Tapatalk

Hello, I've posted a few times regarding remote starts for H3s.
Hummers are one of the harder installs because the passlock system is a multiplex circuit.
I can't really troubleshoot from all the way down here in Texas but it sounds like a short if you're getting these type of issues.
Before you go do any of this - if you're not at all confident in your tech saaviness take it to a car alarm shop.
That being said, the immobilizer bypass units on these cars don't hold up. I tried 3 different bypasses on mine and they all crapped out - I ended up using 2 relays and a resistor instead of the bypass and have had zero issues since.
You could just do a relearn on the bypass module for starters. If you look wherever your control units are - the bypass will usually be the smaller black box. Depending on the brand there will be a process you'll have to go through. If you have trouble locating instructions let me know and I'll look up the procedures.
Check your grounds. Look where wires from the modules are grounded out at the chasis and make sure they are making contact.
Check the fuses on the remote start system itself. There are usually four of them and maybe one on the bypass module. Make sure they are seated well.

Thanks Humvdood, Ill try my best to follow along your post. Hopefully I get this sorted out soon.

 

[rascole]

Sounds like the dreaded "Passlock" problem is starting with you.

 

[Brent Whitfield]

Been having the same issue lately with my h3 as well. Sometimes remote start works fine but others it wont crank then have to let h3 sit for 10 minutes before I can crank with key