Service air bag b0100 - 2005 GMC Sierra

What code ? Plugging in a scan tool to check codes is how it's done , not by the light blinking an then staying on . Your best bet , take it to a qualified repair shop.

AIR BAG Indicator
The AIR BAG indicator, located in the IPC is used to notify the driver of SIR system malfunctions and to verify that the SDM is communicating with the IPC. When the ignition is turned ON, the SDM and the IPC are supplied with ignition 1 voltage. The IPC responds by flashing the AIR BAG indicator seven times. While the IPC is flashing the AIR BAG indicator, the SDM conducts tests on all SIR system components and circuits. If no malfunctions are detected, the SDM will command the IPC to turn the AIR BAG indicator OFF via Class 2 serial data. The SDM provides continuous monitoring of the inflator module circuits by conducting a sequence of checks. If a malfunction is detected, the SDM will store a 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 inflator modules in the event of a collision, or deployment of the inflator modules without the event of a collision. The AIR BAG indicator will remain ON until the malfunction has been repaired.


Code's on a factory or professional scan tool look like this
DTC B0012, B0013, B0014, B0016, B0017, or B0018
DTC B0022, B0024, B0026, B0042, B0043, or B0044
DTC B0028, B0029, or B0030
DTC B0040, B0041, or B0045
DTC B0051
DTC B0053
DTC B0057, B0058, or B0059
DTC B0064, B0065, or B0066
DTC B0077, B0078, B0079, B0080, B0081, or B0082
DTC B0100, B0101, B0102, B0103, B0104, or B0105
DTC B1001


Doesn't do the flashing light code thing .

B0100 refers to your air bag system and the others refer to your air con and blowers.

Don't you DARE even try to mess with the airbag system AT ALL!!!!

Air bag systems use a POWERFUL EXPLOSIVE CHARGE behind them to inflate the air bags, and that explosive charge can be easily set off by a NOVICE messing with the system!!!!!!!!!!

Air bag systems, and even the housings in which they are enclosed should ONLY BE serviced by factory trained/qualified technicians!!!!!

Several people have been KILLED via unauthorized, untrained personnel messing with air bag systems/components!!!!! Don't do it!!!!!

Take your vehicle to a service center AUTHORIZED to service YOUR MAKE of vehicle!!!!!!

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factory service manual

B0100:
Perform trouble checking for the following: the front end sensor, the SDM module, the SDM wiring harness connector. Damage to the following parts needs replacement or repair. For the DTC B0100, detach the front end sensor1 connector and also detach the SDM connector. Perform trouble checking of the signal and voltage circuits between the SDM and the front end sensor for a short to voltage and for a short to ground. Reconnect all the SIR components and if the DTC B0100 is present then the front end sensor1 has to be changed.
B0104
Perform trouble checking for the following: the front end sensor, the SDM module, the SDM wiring harness connector. Damage to the following parts needs replacement or repair. For the DTC B0104, detach the front end sensor1 connector and also detach the SDM connector. Perform trouble checking of the signal and voltage circuits between the SDM and the front end sensor for a short to voltage and for a short to ground. Reconnect all the SIR components and if the DTC B0104 is present then the front end sensor2/right has to be changed.
i could not find anything on the B0140 code so i included the B0104 incase of typo

Hi there:
DTC B0100 - Electronic Front End Sensor 1 Performance

The following can cause an intermittent condition:

• A short between the front end sensor signal and low reference circuits
• High or low resistance in the front end sensor signal and low reference circuits
• Inspect the front end sensor signal and low reference circuits carefully for cutting and/or chafing
• Verify that the correct front end sensor is installed in the vehicle

Hope helps.

B0100 is an airbag sensor problem front left sensor -but your vehicle should have one which should be located behind bumper center by bottom of radiator support

Sometimes the wiring under the passenger seat can become compromised from objects in floor becoming wedged under the seat.May need to be reconnected if possible..Usually if the air bag light remains on , it means the air bag will not engage if needed. Should have the dealer service department check for you.

Try clearing the codes & see if it returns. I do not see a code fault 10. Starts at 12.

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Section 01-20B: Restraints, Passive — Supplemental Air Bag System 1995 Town Car, Crown Victoria, Grand Marquis Workshop Manual DIAGNOSIS AND TESTING Diagnostic Trouble Code Clearing Procedure to Clear Diagnostic Trouble Codes from Diagnostic Monitor Non-Volatile Random Access Memory.
Normal Operation
The air bag diagnostic monitor (14B056) continually checks the air bag system for readiness. When a fault condition is detected, the DTC associated with that fault is stored in the air bag diagnostic monitor's Non-Volatile Random Access Memory (NVRAM). After writing the DTC to NVRAM, the air bag diagnostic monitor signals the fault by flashing the appropriate diagnostic trouble code on the air bag indicator. The diagnostic trouble code written to NVRAM is permanently stored in the air bag diagnostic monitor until cleared by the diagnostic trouble code clearing procedure.

• Upon each cycle of the ignition switch (11572) , the air bag diagnostic monitor checks for diagnostic trouble codes written in NVRAM. If any diagnostic trouble codes exist in NVRAM, the air bag diagnostic monitor will then check to see if these fault conditions are still present.
• If the conditions of the diagnostic trouble code in NVRAM are still present, then the air bag diagnostic monitor will use the air bag indicator to flash out the diagnostic trouble code number that was written in memory.
• If the conditions of the diagnostic trouble code are not still present (indicating an intermittent or serviced fault), the air bag diagnostic monitor will use the air bag indicator to flash out a DTC which is the sum of the diagnostic trouble code in NVRAM plus 40.

Example: Due to corrosion, high resistance develops on the driver side air bag circuit. The air bag diagnostic monitor stores a diagnostic trouble code 32 in NVRAM. Upon each cycle of the ignition switch , the air bag diagnostic monitor checks the resistance of the driver air bag circuit.

• If the resistance is still high, the air bag diagnostic monitor causes the air bag indicator to flash out a DTC 32.
• If the resistance falls within the normal range due to service or an intermittent condition, the air bag diagnostic monitor causes DTC 72 to be flashed on the air bag indicator.

Once a fault has been serviced, the associated diagnostic trouble code may be cleared from NVRAM. Only diagnostic trouble codes that the air bag diagnostic monitor sees as repaired or intermittent may be cleared (diagnostic trouble codes 52 and above). In no circumstances can hard fault conditions (diagnostic trouble codes 45 and below) be cleared.

1. Follow the diagnostic procedures as outlined to service the fault condition flashing on the air bag indicator.

1. Cycle the ignition switch to OFF and then to RUN.

1. Observe air bag indicator prove-out (six ± two seconds) followed by diagnostic trouble code (52-85) flashing completely one time.

1. Locate the Diagnostic "Trouble Code Clear" Connector located underneath the glove compartment (06010) containing Circuits 631 (T/R) and 57 (BK).

1. Use a jumper wire to short Circuit 631 (T/R) to Circuit 57 (BK) or to another good ground. This short must be made after the diagnostic trouble code flashes completely one time, but before the warning light stays on continuously.

1. Hold short until air bag diagnostic monitor tone sounds (approximately five seconds).

1. Release short on Circuit 631 (TAN/RED STRIPE) to Circuit 57 (BLACK). This short must be released within 25 seconds after the diagnostic monitor tone sounds. Diagnostic trouble code is now cleared from NVRAM. Next highest priority diagnostic trouble code stored in NVRAM (if one exists) will begin flashing.
   

first, code b0100 is a fault in the restraint system. front end sensor, restraint sensing diagnostic module or communication between the 2 are suspect problems po420 is an efficiency problem with catalytic converter. most likely would need new converter, but exhaust leaks and oxygen sensor malfuctions can also set code. if this vehicle is under 80,000 miles and does need converter, dealer should repair for free under warranty. that is federally mandated.