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Hummer H2For those who like a little more gleam to their Hummer, the H2 offers a similar rugged look as the H1, but as a lower cost, and with more added features, making it almost a massive luxury SUV.
Hello, Bronxteck. I appreciate the feedback. I'll do what I can can on my own before having to take this H2 to a auto technician to figure out the issue. My last HUMMER H2 (2005 Model) SUT didn't have nowhere near the electronic issues I'm having with this 09 model, but these trucks are aging so problems will continue to occur. Once again, thanks for the feedback.
Mark,
On my list of cruise history I had 3 things that shut the cruise down
Brake pedal
Pedal Initialization (pressing the throttle while the cruise is on)
Steering wheel switch to shut it off
Neal
Neal.... How Can I say It,,,,???? YOU ARE THE MAN..!!! Thanks for taking the time to list the steps... I'll jump on that maybe Monday and give you a read back on what I got.
I'm working through a similar issue with my sons 99 silverado, we installed an LED 3rd brake light and it defeated the cruise control, validated by removing the LED and installing the OEM brake light and the cruise works. still working to understand this one.
What I don't get here is that the L E D 's should draw less current than the Filament Bulb types. What was the OEM brake lamp. Was it a L E D or Bulb. My 2 is L E D.
If it was L E D..the difference could be the type used. At 12 volts the L E D requires a Resistor in series before the LE D . That Value in the after market could make the difference in current draw.
Measure the OHM's load across the OEM one and compare it to the aftermarket.
Here's something from Google.... Hit the More Down Arrow.
@Mark R
That's a good point, and changes my thinking.
it's probably because LEDS present a higher resistance path to ground when not being driven.
Internally the EBCM will probably detect indicator presence by passing a small current through it, maybe around 1mA or less, but not enough to turn the indicator ON.
Also LED's are effectively diodes so tend not to conduct until a threshold voltage has been reached.
The modified circuit below may be how the EBCM operates internally, so V1 will be virtually 0V when a filament lamp is fitted but 12V if not i.e. with a LED
One day I hope to precisely work it out, it may involve monitoring the operating current as well, typical GM technique.
The question is what is the maximum value of shunt resistance that will keep the detection happy?
@Mark R
That's a good point, and changes my thinking.
it's probably because LEDS present a higher resistance path to ground when not being driven.
Internally the EBCM will probably detect indicator presence by passing a small current through it, maybe around 1mA or less, but not enough to turn the indicator ON.
Also LED's are effectively diodes so tend not to conduct until a threshold voltage has been reached.
The modified circuit below may be how the EBCM operates internally, so V1 will be virtually 0V when a filament lamp is fitted but 12V if not i.e. with a LED
One day I hope to precisely work it out, it may involve monitoring the operating current as well, typical GM technique.
The question is what is the maximum value of shunt resistance that will keep the detection happy?
Yep All good. Monitoring the trip Current or Voltage is the best way to go. Also are you using the diagnostic from the shop manual on this circuit? I have the manual but have not had the time to get into it. But it would be of great help to the H2 owners if you could plot that senecio out. Good Man..!!
most of my work is theoretical based on other GM modules I've studied in detail.
So far not seen anything in the manual or on the TECH2 that references this, when I get the chance I'll look further.
Cool,Well I sure it's not the steering wheel switches. The Cruise worked perfect all day from cold start thru hot running.. Then near the end of the day it stopped working. The switches responded with a light touch every time with the steering wheel straight. When I get a chance I'll dig out the manul and try and figure WTF is going on.I will check that rear Ground as we talked about. Sine your 2 is a 2005 they may have changed something in the 2009 2. Just need the weather and time to get into it. Got some electronic stuff I'm working on in the shop.
