dpAtlanta
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- Apr 30, 2019
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- Atlanta, GA
- First Name
- Dave
- Vehicle(s)
- 2019 GT350 (#K2503), 2017 Cayman
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- #1
The data in the Mustang Airbag Control Module (ACM) has evolved over time and a lot more data is available.
Here is what was available in the first year it became available in 2001:
o The number of restraint system diagnostic trouble codes (DTCs) present when the event occurred
o Time from algorithm enable to driver’s and passenger’s seat belt pretensioner deployment enable (msec)
o Timing of the deployment command for various restraint systems including the driver’s and passenger’s first and, where applicable, second stage airbags and belt pretensioners for buckled occupants (msec)
o Longitudinal Crash Pulse data including a data table and data graph showing the longitudinal acceleration and resulting change in forward velocity (delta-V, MPH) versus time (Acceleration and delta-V polarity conforms to SAE J211)
o The module contains 116 milliseconds of acceleration data at 1ms intervals. Users should be aware that most crashes last 100 to 150 milliseconds, and that the limited time duration of data may not be sufficient to capture the entire crash.
There was no pre-crash data, so if someone downloaded the ACM, there is no recorded pre-impact speed.
Starting in 2005, pre-crash data became available.
The amount of pre-crash data has continued to expand.
The 2019's have all of this data;
§ Faults Present at Start of Event
§ Longitudinal and Lateral Delta-V
§ Pre-Crash Data (-1 Second)
§ Ignition cycle, crash
§ Frontal air bag warning lamp, on/off
§ Occupant size classification, front passenger (Child size Yes/No [Hex value])
§ Safety belt status, driver
§ Seat track position switch, foremost, status, driver
§ Seat track position switch, foremost, status, front passenger
§ Safety belt status, front passenger
§ Brake Telltale
§ ABS Telltale
§ ESC/TC Telltale
§ ESC/TC Off Telltale
§ Speed Control Telltale
§ Powertrain Wrench Telltale
§ Powertrain Malfunction Indicator Lamp (MIL) Telltale
§ Pre-Crash Data (-5 Seconds to 0, 2 samples/sec)
§ Speed, vehicle indicated MPH
§ "Accelerator pedal, % full"
§ Service brake, on/off
§ Engine RPM
§ ABS activity (engaged, non-engaged)
§ Brake Powertrain Torque Request (Yes, No)
§ Traction Control via Brakes (engaged, non-engaged)
§ Engine Torque (N-m)
§ Driver Gear Select (Auto Trans)
§ Pre-Crash Data (-5 Seconds to 0, 10 samples/sec)
§ Stability Control Lateral Acceleration (g)
§ Stability Control Longitudinal Acceleration (g)
§ Stability Control Yaw Rate (deg/sec)
§ System Status at Time of Retrieval
§ VIN as programmed into RCM at factory
§ Current VIN from PCM
§ Ignition cycle, download (first record)
§ Ignition cycle, download (second record)
§ Restraints Control Module Part and Serial Numbers
§ Restraints Control Module Software Part Number (Version)
§ Restraints Control Sensor Serial Numbers
§ System Status at Event
§ Complete file recorded (yes,no)
§ Multi-event, number of events
§ Time from event 1 to 2 (msec)
§ Lifetime Operating Timer at event time zero (seconds)
§ Key-on Timer at event time zero (seconds)
§ Vehicle voltage at time zero (Volts)
§ Energy Reserve Mode entered during event (Y/N)
§ Parameters reporting time RCM and satellite sensors lost relative to time zero (if applicable)
§ Deployment Data
§ Supported airbag and associated stage deployment times in (msec)
§ Supported pretensioner deployment times in (msec)
§ Maximum delta-V, longitudinal (MPH[km/h])
§ Time, maximum delta-V longitudinal (msec)
§ Maximum delta-V, lateral (MPH[km/h])
§ Time, maximum delta-V lateral (msec)
§ Supported parameters reporting satellite sensors discriminating deployment (if applicable)
§ Supported parameters reporting satellite sensors safing or confirming deployment (if applicable)
Law enforcement will routinely get a court appointed search warrant in the event of a fatality and get the data from the vehicle. They almost always leave a copy of the warrant on the floor board after they have downloaded the ACM. From this data they will know the vehicle speed 5 seconds prior to impact. The first years actually stored that data in the Power-train Control Module (PCM). The PCM could store up to 25 seconds of data.
Here is what was available in the first year it became available in 2001:
o The number of restraint system diagnostic trouble codes (DTCs) present when the event occurred
o Time from algorithm enable to driver’s and passenger’s seat belt pretensioner deployment enable (msec)
o Timing of the deployment command for various restraint systems including the driver’s and passenger’s first and, where applicable, second stage airbags and belt pretensioners for buckled occupants (msec)
o Longitudinal Crash Pulse data including a data table and data graph showing the longitudinal acceleration and resulting change in forward velocity (delta-V, MPH) versus time (Acceleration and delta-V polarity conforms to SAE J211)
o The module contains 116 milliseconds of acceleration data at 1ms intervals. Users should be aware that most crashes last 100 to 150 milliseconds, and that the limited time duration of data may not be sufficient to capture the entire crash.
There was no pre-crash data, so if someone downloaded the ACM, there is no recorded pre-impact speed.
Starting in 2005, pre-crash data became available.
The amount of pre-crash data has continued to expand.
The 2019's have all of this data;
§ Faults Present at Start of Event
§ Longitudinal and Lateral Delta-V
§ Pre-Crash Data (-1 Second)
§ Ignition cycle, crash
§ Frontal air bag warning lamp, on/off
§ Occupant size classification, front passenger (Child size Yes/No [Hex value])
§ Safety belt status, driver
§ Seat track position switch, foremost, status, driver
§ Seat track position switch, foremost, status, front passenger
§ Safety belt status, front passenger
§ Brake Telltale
§ ABS Telltale
§ ESC/TC Telltale
§ ESC/TC Off Telltale
§ Speed Control Telltale
§ Powertrain Wrench Telltale
§ Powertrain Malfunction Indicator Lamp (MIL) Telltale
§ Pre-Crash Data (-5 Seconds to 0, 2 samples/sec)
§ Speed, vehicle indicated MPH
§ "Accelerator pedal, % full"
§ Service brake, on/off
§ Engine RPM
§ ABS activity (engaged, non-engaged)
§ Brake Powertrain Torque Request (Yes, No)
§ Traction Control via Brakes (engaged, non-engaged)
§ Engine Torque (N-m)
§ Driver Gear Select (Auto Trans)
§ Pre-Crash Data (-5 Seconds to 0, 10 samples/sec)
§ Stability Control Lateral Acceleration (g)
§ Stability Control Longitudinal Acceleration (g)
§ Stability Control Yaw Rate (deg/sec)
§ System Status at Time of Retrieval
§ VIN as programmed into RCM at factory
§ Current VIN from PCM
§ Ignition cycle, download (first record)
§ Ignition cycle, download (second record)
§ Restraints Control Module Part and Serial Numbers
§ Restraints Control Module Software Part Number (Version)
§ Restraints Control Sensor Serial Numbers
§ System Status at Event
§ Complete file recorded (yes,no)
§ Multi-event, number of events
§ Time from event 1 to 2 (msec)
§ Lifetime Operating Timer at event time zero (seconds)
§ Key-on Timer at event time zero (seconds)
§ Vehicle voltage at time zero (Volts)
§ Energy Reserve Mode entered during event (Y/N)
§ Parameters reporting time RCM and satellite sensors lost relative to time zero (if applicable)
§ Deployment Data
§ Supported airbag and associated stage deployment times in (msec)
§ Supported pretensioner deployment times in (msec)
§ Maximum delta-V, longitudinal (MPH[km/h])
§ Time, maximum delta-V longitudinal (msec)
§ Maximum delta-V, lateral (MPH[km/h])
§ Time, maximum delta-V lateral (msec)
§ Supported parameters reporting satellite sensors discriminating deployment (if applicable)
§ Supported parameters reporting satellite sensors safing or confirming deployment (if applicable)
Law enforcement will routinely get a court appointed search warrant in the event of a fatality and get the data from the vehicle. They almost always leave a copy of the warrant on the floor board after they have downloaded the ACM. From this data they will know the vehicle speed 5 seconds prior to impact. The first years actually stored that data in the Power-train Control Module (PCM). The PCM could store up to 25 seconds of data.
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