B0100
DTC B0100, B0101, B0102, B0103, B0104, or B0105
Diagnostic Instructions
* Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure. Diagnostic System Check - Vehicle
* Review Strategy Based Diagnosis for an overview of the diagnostic approach.
* Diagnostic Procedure Instructions provides an overview of each diagnostic category.
DTC Descriptors
DTC B0100
- Electronic Front End Sensor 1 Performance
DTC B0101
- Discard Electronic Front End Sensor 1
DTC B0102
- Incorrect Electronic Front End Sensor 1 Installed
DTC B0103
- Electronic Front End Sensor 2 Performance
DTC B0104
- Discard Electronic Front End Sensor 2
DTC B0105
- Incorrect Electronic Front End Sensor 2 Installed
Diagnostic Fault Information
Circuit/System Description
The inflatable restraint electronic frontal sensor (EFS) utilizes a unidirectional 2-wire circuit. The EFS modulates current on the interface to send ID, state of health (SOH), and deployment commands to the inflatable restraint sensing and diagnostic module (SDM). The SDM serves as a power source and a ground for the EFS. When the ignition is turned on and input power from the SDM is first detected, the EFS will respond 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 EFS continually communicates status messages to the SDM, which determines if a fault is present in the EFS circuit. When a fault is detected, the SDM resets the EFS twice by removing and reapplying power. If the fault is still present, the SDM will set a diagnostic trouble code (DTC).
Conditions for Running the DTC
Ignition voltage is between 9-16 volts.
Conditions for Setting the DTC
DTC B0100 and B0103
* A valid ID message is not received within 5 seconds of the EFS being powered up.
* Status message is not received.
* The SDM has failed twice to reset the EFS.
DTC B0102 and B0105
* The SDM has received an ID message from the EFS that does not match the ID stored in the SDM memory.
* When 2 EFS resets are attempted without the correct identification being detected by the SDM.
DTC B0101 and B0104
Will set when the SDM has received a NOK (Not OK) message from the EFS.
Action Taken When the DTC Sets
* The SDM commands the AIR BAG indicator ON via class 2 serial data.
* The SDM attempts to reset the EFS.
Conditions for Clearing the DTC
* The condition responsible for setting the DTC no longer exists.
* You issue a scan tool CLEAR DTC command.
* A history DTC will clear once 255 malfunction-free ignition cycles have occurred
Diagnostic Aids
The following can cause an intermittent condition:
* A short between the EFS signal and voltage circuits
* High or low resistance in the EFS signal and voltage circuits
* Inspect the EFS signal and voltage circuits carefully for cutting and/or chafing
* Verify that the correct EFS is installed in the vehicle
Circuit/System Testing
1. With the ignition ON, use a scan tool to observe the SIR DTC display. Verify DTC B0101, B0102, B0104, or B0105 set as current.
• If DTC B0101, B0102, B0104, or B0105 is current, replace the malfunctioning EFS.
* For DTC B0101 and B0102 replace the left EFS.
* For DTC B0104 and B0105 replace the right EFS.
2. With the ignition ON, use a scan tool to observe the SIR DTC display. Verify DTC B0100 or B0103 is current.
• Inspect and test wiring system components.
• For DTC B0100 replace the left EFS.
• For DTC B0103 replace the right EFS.
3. Verify DTC B0100, B0101, B0102, B0103, B0104, or B0105 are not current.
4. If DTC B0100, B0101, B0102, B0103, B0104, or B0105 reset as current, remove the inflatable restraint SDM connector. Inspect the SDM connector for damage or corrosion that may cause a malfunction in the EFS circuits.
• If damage or corrosion is found make the appropriate repair.
• Replace the SDM.
Repair Instructions
Perform the Diagnostic Repair Verification after completing the diagnostic procedure. Verification Tests
* Inflatable Restraint Front End Sensor Replacement
* Refer to Programing and Relearning for SDM replacement, setup, and programming. Programming and Relearning