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Old 08-03-2012, 02:44 PM   #1
mansaturn
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Default airbag light

05 ion 2, airbag light has come on and stayed on solid after the key on self test. 3 codes present: airbag deployment commanded, left seatbelt pretensioner low resistance, right seatbelt pretensioner low resistance. we have tried to clear the codes with our scanner, but they stay there. checked the connector inside right kick panel, and it's tight. airbag fuse is good. checked for a seat sensor, but i don't see any wires under the passenger seat. i know we got the seats pretty wet while cleaning them, but i would have expected a seat sensor code rather than deployment codes if the sensor got wet. any suggestions would be greatly appreciated.

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Old 08-03-2012, 07:46 PM   #2
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2003 L-Series 3.0L Sedan
Default Re: airbag light

From the service manual;

The supplemental inflatable restraint (SIR) system supplements the protection offered by the occupants Seat Belt System (2). The SIR system may contain several inflator modules located throughout the vehicle, i.e. steering wheel module (1), instrument panel (I/P) module (1), or roof rail modules. In addition to inflator modules, the vehicle may contain seat belt pretensioners that tighten the seat belt in the event of a collision, thus reducing the distance between the occupant and the seat belt when an inflator module is deployed. 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 located at strategic points on the vehicle. When the SDM detects a collision, it will process the information provided by the sensors to further support air bag or pretensioner deployment. The SDM will deploy the frontal air bags and pretensioners if it detects a collision of sufficient force. 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 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.

The frontal supplemental inflatable restraint (SIR) system consists of the following components:
  • AIR BAG indicator located in the instrument panel cluster (IPC)
  • Driver and front passenger knee bolsters
  • Inflatable restraint sensing and diagnostic module (SDM)
  • Inflatable restraint instrument panel (I/P) module
  • Inflatable restraint steering wheel module
  • Inflatable restraint steering wheel module coil
  • Inflatable restraint seat belt retractor pretensioners
  • Inflatable restraint wiring harnesses
  • Steering wheel and column
AIR BAG Indicator

The AIR BAG indicator, located in the instrument panel cluster (IPC) is used to notify the driver of SIR system malfunctions and to verify that the sensing and diagnostic module (SDM) is communicating with the IPC. When the ignition is turned ON, the SDM is supplied with ignition positive voltage. The SDM requests the IPC to flash the AIR BAG indicator seven times. While flashing the indicator, the SDM conducts test on all SIR system components and circuits. If no malfunctions are detected the SDM will communicate with the IPC through the class 2 serial data circuit and command the AIR BAG indicator OFF. The SDM provides continuous monitoring of the air bag circuits by conducting a sequence of checks. If a malfunction is detected the SDM will store a diagnostic trouble code (DTC) and command the IPC to turn the AIR BAG indicator ON via class 2 serial data. The presence of a SIR system malfunction could result in non-deployment of the air bags or deployment in conditions less severe than intended. The AIR BAG indicator will remain ON until the malfunction has been repaired.


The above is only a partial reprint. Unless you're familiar with the airbag system and familiarity with servicing them, this may be best left to GM service.

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Old 08-08-2012, 11:37 AM   #3
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Default Re: airbag light

update: i found that both front pretensioner connectors were cracked and not well plugged in. makes me think that maybe they were deployed once and the pretensioners replaced. so i replaced the connectors, it got rid of both pretensioner codes, but the unclearable "deployment commanded" B0051 code remains. looks like a trip to the local gm dealer is in order.

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Old 08-08-2012, 04:21 PM   #4
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2003 L-Series 3.0L Sedan
Default Re: airbag light

From the service manual;

DTC B0051

Circuit Description

The inflatable restraint sensing and diagnostic module (SDM) contains a sensing device that converts vehicle velocity changes into an electrical signal. The SDM compares this electrical signal to a value stored in memory. When the generated signal exceeds the stored value, the SDM performs additional signal processing and compares the generated signals to values stored in memory. When 2 of the generated signals exceed the stored values, the SDM will cause current to flow through the deployment loops, deploying the air bags and/or pretensioners causing DTC B0051 to set.


Important

The seat belt pretensioners may deploy for impacts that are not severe enough to warrant frontal or side air bag deployment. The SDM is capable of sustaining 3 pretensioner deployment events, or 1 frontal or side deployment event. After the maximum number of deployments has occurred, DTC B0051 becomes a latched code, which cannot be cleared.

DTC Descriptor

This diagnostic procedure supports the following DTC:

DTC B0051 Deployment Commanded

Conditions for Running the DTC

Ignition 1 voltage must be within the normal operating range.

Conditions for Setting the DTC

The DTC will set if one of the following conditions occurs.

The SDM detects a frontal impact of sufficient force to warrant deployment of the frontal inflator modules and/or pretensioners.
The SDM detects a side impact of sufficient force to warrant deployment of a roof rail inflator module.
Action Taken When the DTC Sets

The SDM commands the AIR BAG warning lamp ON via Class 2 serial data.
The SDM records crash data.
Conditions for Clearing the DTC

DTC B0051 can be cleared if the following conditions are met.

Three consecutive seat belt pretensioner deployment events have not occurred
One frontal or side air bag deployment has not occurred.
The condition responsible for setting the DTC no longer exists and the scan tool Clear DTCs function is used.
A history DTC will clear once 255 malfunction-free ignition cycles have occurred.
DTC B0051 becomes a latched code after 3 consecutive pretensioner deployments or 1 frontal or side air bag deployment. You cannot clear a latched code. Replace the SDM after following the instructions in the diagnostic table.

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Old 08-09-2012, 03:08 PM   #5
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Default Re: airbag light

yep, and i have a good sdm out of an undeployed system, but i'm going to wait until they tell me it definitely needs an sdm to try it. i'm assuming that if it does work, they will still have to program the bcm to accept it. will keep you posted.

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Old 08-09-2012, 04:18 PM   #6
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2003 L-Series 3.0L Sedan
Default Re: airbag light

I do not think there's any programming needed for the bcm since the sdm is an independent unit that controls the airbag system. About the only thing the sdm has in common with the bcm is to communicate to it as the bcm provides all the interface requirements to communicate through the diagnostic port under the steering wheel for either GM's Tech II reader/scanner/programmer or any reader on the market capable of decoding OBD II DTC's. Better readers will have ABS and possibly airbag reading abilities. ABS and airbags are not emissions related so general off the shelf readers won't have the capability to read ABS or airbag codes. You'd have to wade through the hundreds of available readers to find one capable of decoding ABS and/or airbag codes.

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Old 08-11-2012, 06:56 AM   #7
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Default Re: airbag light

local dealer will look at it monday. here's hoping we don't have to buy an sdm

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Old 08-14-2012, 10:22 AM   #8
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Default Re: airbag light

well, dealer was unable to match up the used sdm with our car. needs new sdm to the tune of $450. i'll avoid boring everyone with my standard diatribe about cars being made way over-complicated by government regulations, not to mention electronic parts that are specifically designed by the vehicle manufacturers to fail and become completely unserviceable.

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