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ASEMaster35yrs
ASEMaster35yrs, Chevy Technician
Category: Chevy
Satisfied Customers: 2030
Experience:  ASE Certified since 1972,Master Auto tech,Heavy Truck Tech ,chev dealer tech
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Chevrolet Silverado 1500 Classic LT: I have a B0100 and a B0103

Resolved Question:

I have a B0100 and a B0103 code and was wondering what could cause both of these codes at the same time.
Submitted: 11 months ago.
Category: Chevy
Expert:  ASEMaster35yrs replied 11 months ago.

Hi, glad to be of help. I think your problem is in the SDM, however, check for shorts. These codes refer to your air bag and B103 refers to right front sensor.



info on the B0100



DTC B0100, B0101,
B0102, B0103, B0104, or B0105



DTC Descriptors





DTC B0100 : Front End
Sensor 1 Performance (Left)





DTC B0101 : Discard Front End Sensor 1 (Left)





DTC B0102 : Incorrect Front End Sensor 1 Installed (Left)





DTC B0103 : Front End Sensor 2 Performance (Right)





DTC B0104 : Discard Front End Sensor 2 (Right)





DTC B0105 : Incorrect Front End Sensor 2 Installed (Right)





Diagnostic Fault Information





.









Circuit









Short to Ground









High Resistance









Open









Short to Voltage









Signal Performance













Front End Sensor Left Signal Circuit









--









--









B0100









--









--













Front End Sensor Left Voltage Circuit









B0100









B0100









B0100









B0100









B0100













Front End Sensor Right Signal Circuit









--









--









B0103









--









--













Front End Sensor Right Voltage Circuit









B0103









B0103









B0103









B0103









B0103









Circuit/System Description





The inflatable
restraint front end sensor utilizes a unidirectional 2-wire circuit. The front
end sensor modulates current on the interface to send ID, State of Health, and
deployment commands to the inflatable restraint sensing and diagnostic module
(SDM). The SDM serves as a power source and a ground for the front end sensor.
When the ignition is turned ON and input power from the SDM is first detected,
the SIS responds by performing internal diagnostics and sending an ID to the
SDM. The SDM considers the ID to be valid if the response time is less than 5
seconds. The front end sensor continually communicates status messages to the
SDM, which determines if a fault is present in the front end sensor circuit.
When a fault is detected, the SDM resets the front end sensor twice by removing
and reapplying power to it. If the fault is still present, the SDM will set a
DTC.



Conditions for
Running the DTC





Ignition voltage is
between 9-16 volts.



Conditions for
Setting the DTC





All of the following
conditions exist for 2.5 seconds:



B0100 for Front End
Sensor 1 or B0103 for Front End Sensor 2















A valid ID message is not received within 5 seconds of the
front end sensor being powered up.















The SDM has not received a message from the front end sensor
for more than 375 milliseconds.















The SDM has reset the front end sensor twice without
detecting a valid ID message.





B0101 for Front End Sensor 1 or B0104 for Front End Sensor 2















The SDM has received an ID message from the front end
sensor, which does not match the ID stored in the SDM memory.















The SDM has reset the front end sensor twice without
detecting a correct ID message.





B0102 for Front End Sensor 1 or B0105 for Front End Sensor 2





The SDM has received
a NOK message from the front end sensor.



Action Taken When the
DTC Sets















The SDM commands the AIR BAG indicator ON via serial data
communications.















The SIR System is disabled and no deployments are allowed.





Conditions for Clearing the DTC















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.



 

Circuit/System Testing





1.

Important: When removing connectors inspect for damage or corrosion. Damage or corrosion in the following requires repair or replacement of the affected component/connector.











The front end sensor

















The SDM module:



The front end sensor wiring harness connector




The SDM wiring harness connector

  • Ignition ON, use the scan tool as clear SIR codes then recheck for DTCs. Verify that DTC B0101, B0102, B0104, or B0105 is not set.



If DTC B0101 or B0102 is set current replace the front end sensor 1/left.



If DTC B0104 or B0105 is set current replace the front end sensor 2/right.

  • If DTC B0100 is current, disconnect the front end sensor 1 connector, or if DTC B0103 is current disconnect the front end sensor 2 connector. Refer to front end sensor replacement in Repair Instructions for location of connector.



  • Remove the SDM connector, refer to SDM replacement in

Repair Instructions for connector location.



  • Test the signal and voltage circuits between the SDM and

front end sensor. Verify that a short to voltage, short to ground, or open/low resistance does not exist.



If any of the above conditions are found make the appropriate repair.



6.Reconnect all SIR components. Ignition ON, use the scan tool to clear the DTCs then recheck for DTCs. Verify no DTCs are set.



If DTC B0100 was current replace the front end sensor 1.

After replacement refer to Repair Verification.




If DTC B0103 was current replace the front end sensor 2.
After replacement refer to Repair Verification.













Repair Verification





Ignition ON, use the scan tool to clear the DTCs then recheck for DTCs. Verify no DTCs are set.















If DTC B0100 or B0103 was current replace the SDM.





Forum links

http://chevroletforum.com/forum/silverado-fullsize-pick-ups-21/2005-chevy-silverado-22679/




http://www.dieselplace.com/forum/76-gm-trucks/81-electrical/349100-air-bag-light-steady.html

Customer: replied 11 months ago.

I found out a little more about what might have happened......In a recent trailer connector wiring job, a couple wires were shorted together and fuses were blown. He thinks the air bag light came on shortly after that.

Expert:  ASEMaster35yrs replied 11 months ago.

I think you found the problem. Find the short and repair it. Use a short finder. you can get one here: http://www.tooltopia.com/tool-aid-25100.aspx?utm_source=pricegrabber&utm_medium=cse&utm_term=SGT25100&utm_campaign=pricegrabber_r1

Check google for best price, short finders can be found at any auto parts store. For a heads up, the people who did your trailer wiring are liable to pay for your problem. Contact consumer affairs.

Customer: replied 11 months ago.

Just for my information, what is the SDM and where is it located in this truck? And, do you happen to have a schematic of the Air bag circuit?

Expert:  ASEMaster35yrs replied 11 months ago.


Sensing and Diagnostic Module. The SDM is located under a flap of carpet under Driver seat. There is a service bulletin on this for 07-09. Check with your dealer to see if you are covered. New Recall #09184 - 07-09 Silverado/Sierra

Forum link

http://www.truckmodcentral.com/forums/f97/new-recall-09184-07-09-silverado-sierra-2620/

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ASEMaster35yrs, Chevy Technician
Category: Chevy
Satisfied Customers: 2030
Experience: ASE Certified since 1972,Master Auto tech,Heavy Truck Tech ,chev dealer tech
ASEMaster35yrs and 7 other Chevy Specialists are ready to help you
Expert:  ASEMaster35yrs replied 10 months ago.
Thank you for your positive feedback. Thank you for using just answer.
Expert:  ASEMaster35yrs replied 10 months ago.
Please let me know if your problem is fixed. I hope the air bag diagrams I sent you helped. Please rate my answer so I can get paid.

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