The cheapest (free) thing to try but may not work and make things worse – do a passlock relearn – see below for how and why/why not. What to look at in the H3 if you have security system problems by symptom: Next most likely is the BCM – this is the real "brains" of the security system in the H3 – it is doing all the figuring out if it likes the signals coming from the ignition and enabling or disabling the starter and sending the OK signal or not to the ECU. Part three: the ECU (engine management computer) looks at the signal coming from the TDM (in the H3 that is the BCM) and if it does not get the OK signal it shuts off the fuel injectors.Īny of these three parts can fail, but the most likely one is the ignition because that has moving parts and due to the design of the ignition and how it is connected. Also in the H3, in addition to not sending the OK signal to the ECU if it does not like the signals coming from the ignition, the BCM will disable the starter. In the H3 the TDM is not a separate piece, it is integrated into the BCM. Part two: The Theft Deterrent Module (has been called multiple different names over the years – I will call it the TDM) – reads the signals from the ignition and if that signal matches what it is expecting then the TDM sends a signal to the ECU saying – "OK".
*** Apparently export H3's (non-US sold) may have a chipped key (resistor in the key) - *** thanks Mark. In the H3 the key is just a plain key – there is no chip, resistor, or anything else in the key. Part one: the ignition – there is a resistor, or a chip, or a radio transmitter in either the key itself or the ignition. but they all work in basically the same way. It has many different names and versions – VATS, Passlock, Passlock II, Passkey, etc. GM has used the same security model for decades. I would not claim to be an expert on this, this is just what I have been able to piece together from all the info I could find out there, I could be wrong about any number of things and any corrections or additions are welcome. This is my understanding of how the security system works and what the different parts of it are and what to look at if it fails. Here is what I have learned about the H3 security system: It has been 2 weeks now and I have had zero issues since installing the newrockies module. Posts: 76 Joined: Wed 4:14 pm Vehicle: 2008 H3 Alpha I just installed the module yesterday, but with a 50% chance of no crank like I had, it does not take more than one day to confirm that the situation is different now.
#Export passlocker update#
If it fails or starts acting squirrely in the future, I will update this, so far so good. There are mixed reviews of the newrockies modules, some say they work great, some can't get them to work. It is not clear from newrockies docs if it works with the Alpha, but it works fine on my 2008 Alpha. Depending on exactly what part of the system has failed, sometimes this can be fixed much cheaper means, but I just wanted the whole system bypassed so I would never have to worry about any part of it failing in the future and leaving me stranded somewhere.
#Export passlocker install#
Anyway just followed the instructions to install it and did the security system relearn and it fires right up now every time. Not too difficult to install, but it is a little awkward because the BCM is below the glove box on the right side and I am right handed.
#Export passlocker pro#
After doing a lot of googling and reading about all the different ways to fix this I decided to get a newrockies pro module. You had about a 50% chance of no crank every time you tried to start the H3. This has happened in the past, just once in a blue moon it would do this but about a month ago it started doing it all the time. So I had the classic dying passlock problem that plagues GM vehicles, go to start the truck, turn the key and no crank and security light blinking.
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