So after a collision there may be half a dozen data points, for half a dozen data items, accounting for half a dozen seconds pre-collision. It might record it for a couple of seconds, at most maybe 15 or 20 seconds worth. The SDM may receive and record this data maybe once a second. This data would be sent from the ECM/PCM to the SDM over a much higher speed data bus than ALDL, eg. For example, vehicle speed, brake and accelerator pedal position, steering angle input. The data would include a few basic things only. That's the module that senses a collision and actually deploys airbags and pretensioners. I don't know for sure but I imagine the data stored would be stored in the SRS module (called SDM module in the GM world). This certainly isn't the case for VX/VY commodores. Some more modern vehicles may record some crash data when there is an SRS deployment.
#Aldl scan software#
Just as with the PCM, there is no software within the BCM that would trace its RAM locations either. Some of that data may be able to be logged from the BCM via ALDL, but it would be very slow and congest the ALDL bus. Not necessarily controlled by the BCM, but the BCM may have an input to know what some of them things are doing. Most or some of the things you have mentioned would include the BCM (body control module) in their circuit. Its purpose is engine and transmission related (powertrain). The PCM stands for Powertrain Control Module. Monitor the change in the software and if it repeats constantly on/off with each on/off of the switch, its a good chance that is the location in the memory of the PCM thats for that switch.ĭoes that make sense or am i off track in my explanation. Run the monitoring search software for say a memory location (which has knowledge of dash switches) and press a switch for say whippers. Sitting in the vehicle, connected up to the PCM via the OBD connector (ALDL) in my case. I just visulised this scenario, so it doesnt need to be instant i guess. So I just presumed it''l be the PCM that has knowledge of this somewhere within it at some time. I know that on some vehicles there can be such feedback via the OBD connections to show if there are things like dash switches operations on/off ect. I know there is things like last few minutes records on the PCM which can and sometimes is used in vehicle accidents by the police. Thanks antus and j_ds_au for the feedback and advice,Īntus, i presumed that the PCM monitors or at least would know whats happened/happening to the vehicle, or am I far off track there? I guess what i am asking, is if there is software out there which either already does this or even something i can work on to get my end results?Īppreciate thoughts and advise as always. Of course it will only monitor that of those which go through the PCM (i think even if via the BCM). My intent would then be, I can say monitor a range of address location at a time that monitors for example the Park lights, head lights, A/c switch, brake pedal switch, door lock switches, etc. With my ALDL cable connected to the working PCM in my car, i would like some software that I can tell to scan or monitor a range of memory locations, so if any of those monitored locations change, it flags and displays that location as it changes. I am not 100% sure where to start or what i really require, as something may already be freely available for me to do it that i am yet to know about. I want to ideally be able to note changes in a PCM's memory locations live at the time via the ALDL connection in my car. Hi, this might be a very straight forward issue to deal with by the guru's, so i am hoping i can get some guidance here please. : LEDs to indicate power on and ALDL bus activity
#Aldl scan android#
: Logs four external analog signals when used with our 'ALDL Scan' Android App. : Switch selectable 10K resistor across A and B pins (required on certain vehicles to enable ALDL mode) : Compatible with most 1982-1995 General Motors (GM) vehicles.
#Aldl scan windows#
: Most MS Windows applications that use a COM port to communicate to ALDL at 9600 baud : ALDLDroid (Demo Video) Get ALDLDroid here! Analog channels can be monitored and recorded right along with the ALDL data being read by the application. This allows for the connection of devices such as wide band oxygen sensors. When used with our 'ALDL Scan' application, the user can also log four additional analog data channels via the rear RJ45 connector.
#Aldl scan Bluetooth#
The adapter can also connect via Bluetooth to laptop computers for use with computer applications such as 'TTS Datamaster'. This adapter can be used with our own 'ALDL Scan' Android application.
#Aldl scan code#
Our '12 Pin ALDL OBD1 Bluetooth Scanner / Code Reader / Adapter' allows for the monitoring and recording of General Motors (GM) vehicle performance data to the user's Android device. : 12 Pin ALDL OBD1 Bluetooth Scanner / Code Reader / Adapter (MK II)