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 B0100 : Front EndSensor 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
Short to Ground
Short to Voltage
Front End Sensor Left Signal Circuit
Front End Sensor Left Voltage Circuit
Front End Sensor Right Signal Circuit
Front End Sensor Right Voltage Circuit
The inflatablerestraint front end sensor utilizes a unidirectional 2-wire circuit. The frontend sensor modulates current on the interface to send ID, State of Health, anddeployment 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 theSDM. The SDM considers the ID to be valid if the response time is less than 5seconds. The front end sensor continually communicates status messages to theSDM, 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 removingand reapplying power to it. If the fault is still present, the SDM will set aDTC.
Conditions forRunning the DTC
Ignition voltage isbetween 9-16 volts.
Conditions forSetting the DTC
All of the followingconditions exist for 2.5 seconds:
B0100 for Front EndSensor 1 or B0103 for Front End Sensor 2
A valid ID message is not received within 5 seconds of thefront end sensor being powered up.
The SDM has not received a message from the front end sensorfor more than 375 milliseconds.
The SDM has reset the front end sensor twice withoutdetecting 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 endsensor, which does not match the ID stored in the SDM memory.
The SDM has reset the front end sensor twice withoutdetecting a correct ID message.
B0102 for Front End Sensor 1 or B0105 for Front End Sensor 2
The SDM has receiveda NOK message from the front end sensor.
Action Taken When theDTC Sets
The SDM commands the AIR BAG indicator ON via serial datacommunications.
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.
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
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.
Repair Instructions for connector location.
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.
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.
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.
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.
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?
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