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Diagnostic Trouble Code: B0055
Diagnostic Trouble Code Name: Side Airbag Deployment Commanded
Vehicle Make: Chevrolet
Vehicle Model: Lumina (VE)
Diagnostic Code Entered By: ZerOne
Diagnostic Code Entered On: Wed Oct 06, 2010 11:00 pm
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Please Note: The DTC Information provided has been randomly generated.
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Diagnostic Trouble Code Description:
Driver Seat Position Sensor Circuit
Possible Sensor Faults
SDM - Sensing and Diagnostics Module (Airbag Black Box)
Possible Related Diagnostic Trouble Codes
DTC B0079
Circuit / System Description
The inflatable restraint seat position sensor is used to determine the proximity of a front driver or passenger seat position with respect to the frontal air bag. The seat position sensor interfaces with the sensing and diagnostic module (SDM). The state of the seat position sensor allows the SDM to disable stage?2 of the frontal air bag for a front seat that is forward of a forward/rearward point in seat track travel. The seat position sensor is a hall effect sensor that is mounted on the outboard seat track of the driver and passenger seats. The seat track includes a metal bracket that shunts the seat position sensor magnetic circuit creating 2 states of seat position. The shunted state represents a rearward seat position. The non-shunted state represents a forward position. The seat position sensor provides 2 current ranges, one range for the shunted state and a second range for a non-shunted state. These 2 states are inputs to the SDM, state?1 (shunted) being the rearward threshold and state?2 (non-shunted) being the forward threshold. When the SDM receives input from a seat position sensor that state?1 threshold is reached (seat is rearward), the SDM will not disable stage?2 deployment, if required by the deployment sensors. When state?2 threshold is reached (seat is forward), the SDM will disable stage?2 deployment on the side the seat is forward. The SDM monitors the seat position sensor circuit and if a fault is detected, the SDM will set codes B0079 and defaults to disabling stage?2 frontal deployment.
Circuit / System Testing
1) Ignition OFF, disconnect the harness connector at the seat position sensor.
2) Test for less than 1?? between the low reference circuit terminal B and ground.
* If greater than the specified range, test the low reference circuit for an open/high resistance. If the circuit tests normal, replace the SDM.
3) Ignition ON, test for 1.2-2.0?V between the signal circuit terminal A and ground.
* If greater than the specified range, test the signal circuit for a short to voltage. If the circuit tests normal, replace the SDM.
* If less than the specified range, test the voltage reference circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the SDM.
If the circuits test normal, replace the seat position sensor.
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