I got a B0103 error coder. Elec Front End Sensor 2 Fault. I want to check the connection before I buy and replace the part. I did a quick look under the car but didn't see it. That was a very quick look. I didn't have time to start removing parts. Can anyone point me in the right direction to locate this sensor? Anyone have a diagram?

I already zip tied the connector under both seats. So now I'm on this.

 

Anyone? Before I start tearing into this?

 

If were talking about the front air bag sensors, lift the hood, and one is on the driver side , just below the hood strut, and the other is on the passenger side below the other strut just below the front facia bolts for mounting the front bumper facia.
The wiring comes from the passenger side wiring harness next to the horn.

 

Maybe your out side temp sensor? It is located i the bumper area..?

 

The temp sensor is located on passenger side of radiator as per the pics

 

Thanks, I'll find it and hope I can solve the problem.

 

Has nothing to do with the under seat connectors. Here is the diagnostic procedure for the DTC.

DTC B0100, B0101, B0102, B0103, B0104, or B0105
Diagnostic Instructions
• Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure.
• 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
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.
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.
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 requests the instrument panel cluster (IPC) to illuminate the AIR BAG indicator.
• The SDM attempts to reset the EFS.
Conditions for Clearing the DTC
• The condition responsible for setting the DTC no longer exists.
• A history DTC will clear once 100 malfunction-free ignition cycles have occurred.

Reference Information
Schematic Reference
SIR Schematics

Connector End View Reference
Component Connector End Views

Description and Operation
SIR System Description and Operation

Electrical Information Reference

• Circuit Testing
• Testing for Intermittent Conditions and Poor Connections
• Connector Repairs
• Wiring Repairs

Scan Tool Reference
Control Module References for scan tool information
Circuit/System Testing
Important: Refer to SIR Service Precautions.

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

• Front end sensor
• SDM module
• Front end sensor wiring harness connector
• SDM wiring harness connector

Ignition OFF, disconnect the harness connector at the SDM and the appropriate front end sensor.
Ignition ON, test for less than 1-volt between the front end sensor signal circuit terminal B and ground.
⇒ If greater than the specified range, test the circuit for a short to voltage.
Ignition ON, test for less than 1-volt between the front end sensor low reference circuit terminal A and ground.
⇒ If greater than the specified range, test the circuit for a short to voltage.

Test for infinite resistance between the front end sensor signal circuit terminal B and ground.
⇒ If less than the specified value, test the circuit for a short to ground.

Test for less than 1 ohm between the front end sensor signal circuit terminals listed below:
• Right front end sensor terminal B and SDM harness connector terminal 37.

• Left front end sensor terminal B and SDM harness connector terminal 36.

⇒ If greater than the specified range, test the signal circuit for an open/high resistance.

Test for less than 1 ohm between the front end low reference circuit terminals listed below:
• Right front end sensor terminal A and SDM harness connector terminal 39.
• Left front end sensor terminal A and SDM harness connector terminal 38.
⇒ If greater than the specified range, test the low reference circuit for an open/high resistance.

If all circuits test normal, replace the appropriate front end sensor.
Reconnect all SIR components. Ignition ON, verify the DTC does not set as current.
⇒ If the DTC resets as current , replace the SDM.

Repair Instructions
Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

• Inflatable Restraint Front End Sensor Replacement
• SIR/SRS Wiring Repairs
• Control Module References for SDM replacement, setup, and programming

 

This is awesome. Explains a lot of the error codes. Great info. Thanks Bill!