The vehicle has a number of computers that record information about the vehicle's performance and how it is driven. For example, the vehicle uses computer modules to monitor and control engine and transmission performance, to monitor the conditions for airbag deployment and deploy them in a crash, and, if equipped, to provide antilock braking to help the driver control the vehicle. These modules may store data to help the dealer technician service the vehicle.
Some modules may also store data about how the vehicle is operated, such as rate of fuel consumption or average speed. These modules may retain personal preferences, such as radio presets, seat positions, and temperature settings.
Reporting Safety Defects to
General Motors
Event Data RecordersHood Ajar Indicator Description and Operation Panels
Hood Ajar SwitchThe body control module (BCM) applies B+ to the hood ajarsignal circuit and monitors the voltage to determine the positionof the hood. When the hood is closed, the switch is open andvoltage remains high. When the hood is open, the switch is closedand the voltage is pulled low.The BCM ...