Where is the computer?
Race Director
Joined: Mar 2005
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From: Austin Texas
Which computer? the ECM (Engine Control Module) is in the passenger side wheel well. the BCM (Body Control Module) is under the passenger side floor.
Shouldn't it be under Warranty for a 2010?
Shouldn't it be under Warranty for a 2010?
Team Owner
Joined: Oct 2004
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From: San Clemente CA
Tech Contributor
Joined: Oct 1999
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From: Charlotte, NC (formerly Endicott, NY)
It should be if it has failed. However if his issue is due to an accident it will not be covered by warranty. Air bags are controlled by the Sensing and Diagnostic Module (SDM). ECM and BCM don't have anything to do with it other than the BCM will unlock the doors after the SDM sends it an unlock doors command. After an accident where one or more air bags are deployed the SDM has to be replaced.
The supplemental inflatable restraint (SIR) system supplements the protection offered by the occupant's seat belt system (2). The SIR system may contain several inflator modules located throughout the vehicle, i.e. steering wheel module (1) and instrument panel (I/P) module (1). Each inflator module has a deployment loop that is controlled by the sensing and diagnostic module (SDM) mounted inside the vehicle. The SDM determines the severity of a collision with the assistance of various sensor inputs. When the SDM detects a collision of sufficient force, it will process the information provided by the sensors to further support air bag deployment. The SDM performs continuous diagnostic monitoring of the SIR system electrical components. Upon detection of a circuit malfunction, the SDM will set a DTC and inform the driver by turning the AIR BAG indicator ON. The steering column (1) and knee bolsters (3) are designed to absorb energy and compress during frontal collisions in order to limit leg movement and decrease the chance of injury to the driver and passenger. After an air bag deployment, the SDM will send out a post-air message to the body control module (BCM). The BCM will unlock the doors and turn ON the interior lights 15 seconds after receipt of this message.
The sensing and diagnostic module (SDM) is a microprocessor and the control center for the supplemental inflatable restraint (SIR) system. This SDM has 2 fused power inputs: one fuse is for the battery voltage and the other fuse is for the ignition voltage. The SDM uses vehicle battery voltage as its main power input. The SDM then uses the vehicles serial data communication line and the ignition voltage logic input for enabling or disabling the SIR deployment loops. The SDM contains internal sensors along with several external sensors, if equipped, mounted at strategic locations on the vehicle. In the event of a collision, the SDM compares the signals from the internal and external sensors to a value stored in memory. When the generated signals exceed the stored value, the SDM will cause current to flow through the appropriate deployment loops to deploy the air bags or seat belt pretensioners. If the force of the impact is not sufficient to warrant inflator module deployment, the SDM may still deploy the seat belt pretensioners. The SDM records the SIR system status when a deployment occurs and turns the AIR BAG indicator located in the instrument panel cluster (IPC) ON. As soon as 3 distinct deployment commands, representing different events, have been issued to any belt pretensioner, or the SDM commands any front and side air bag to deploy once, the SDM shall be considered to not be reusable. The SDM performs continuous diagnostic monitoring of the SIR system electrical components and circuitry when the ignition is turned ON. If the SDM detects a malfunction, a DTC will be stored and the SDM will command the AIR BAG indicator ON, notifying the driver that a malfunction exists. In the event that ignition positive voltage is lost during a collision, the SDM maintains a 23-volt loop reserve (23 VLR) for deployment of the air bags. It is important when disabling the SIR system for servicing or rescue operations to allow the 23 VLR to dissipate, which could take up to 1 minute.
Here is where the various so called air bag system components are located in the car.
(1) Right Front End Sensor--Located on the front of the vehicle in the engine compartment
(2) Front Hood Assist Rod--A gas shock located under the front hood on the passenger side
(3) Vehicle Battery--Located under the hood on the right side (LS2), in the trunk on the right side (LS7)
(4) Instrument Panel (I/P) Air Bag--Located at the top right under the I/P
(5) Sensing and Diagnostic Module (SDM)--Located underneath the vehicle center console in front of shifter
(6) Passenger Presence System (PPS)--Located in the passenger seat under the seat trim
(7) Seat Belt Pretensioner--Located on the inboard side of the passenger seat
(8) Side Impact Sensor (SIS)--Located inside passenger/right door near rear of door
(9) RF Side Impact Air Bag--Located on the seat back of passenger seat
(10) Rear Compartment Lid Assist Rod--A gas shock is located under the rear trunk lid on the passenger side
(11) Rear Compartment Lid Assist Rod--A gas shock is located under the rear trunk lid on the driver side
(12) Side Impact Sensor (SIS)--Located inside driver/left door near rear of door
(13) LF Side Impact Air Bag--Located on the seat back of driver seat
(14) Seat Belt Pretensioner--Located on the inboard side of the driver seat
(15) Steering Wheel Air Bag--Located on the steering wheel
(16) Front Hood Assist Rod--A gas shock located under the front hood on the driver side
(17) Left Front End Sensor--Located on the front of the vehicle in the engine compartment
If removing this module the OP should make sure the battery is disconnected for at least a minute before attempting removal. It stores a temporary electrical charge to fire the air bags in case battery power is lost during an accident. It takes at least a minute without battery power to be sure the charge bleeds off.
Bill
Last edited by Bill Dearborn; Jan 31, 2012 at 03:10 PM.
Tech Contributor
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Bill
