B0084
DTC B0083 or B0084
Diagnostic Instructions
* Perform the Diagnostic System Check - Vehicle (Initial Inspection and Diagnostic Overview) prior to using this diagnostic procedure.
* Review Strategy Based Diagnosis (Initial Inspection and Diagnostic Overview) for an overview of the diagnostic approach.
* Diagnostic Procedure Instructions (Initial Inspection and Diagnostic Overview) provides and overview of each diagnostic category.
DTC Descriptors
DTC B0083 00
- Front End Sensor 1 No Additional Information (Left)
DTC B0083 39
- Front End Sensor 1 Internal Electronic Failure (Left)
DTC B0083 0F
- Front End Sensor 1 Incorrect Component Installed (Left)
DTC B0083 3A
- Front End Sensor 1 Invalid Serial Data Received (Left)
DTC B0084 00
- Front End Sensor 2 No Additional Information (Right)
DTC B0084 39
- Front End Sensor 2 Internal Electronic Failure (Right)
DTC B0084 0F
- Front End Sensor 2 Incorrect Component Installed (Right)
DTC B0084 3A
- Front End Sensor 2 Invalid Serial Data Received (Right)
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 front end sensor 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 may reset the front end sensor up to 2 times 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
B0083 00 or B0084 00
* The front end sensor has been shorted to voltage, open, or shorted to ground.
* The front end sensor current has been above 23 mA for longer than 5 milliseconds.
* The SDM has not received a message from the front end sensor for more than 375 milliseconds.
B0083 39 or B0084 39
* The SDM has received a NOK message from the front end sensor.
* The SDM has not received a message.
* The SDM has received invalid serial data from the front end sensor.
B0083 0F or B0084 0F
The SDM has received erratic messages from the front end sensor.
B0083 3A or B0084 3A
* 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 the correct ID message.
Action Taken When the DTC Sets
* The SDM commands the AIR BAG indicator ON via serial data communications.
* The frontal SIR System is disabled and no frontal deployments are allowed. Side deployments and rollover detection is still enabled.
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 100 malfunction-free ignition cycles have occurred.
Reference Information
Schematic Reference
SIR Schematics ([1][2]Air Bag Systems)
Connector End View Reference
Component Connector End Views (Connector Views)
Electrical Information Reference
* Circuit Testing (Component Tests and General Diagnostics)
* Connector Repairs (Component Tests and General Diagnostics)
* Testing for Intermittent Conditions and Poor Connections (Component Tests and General Diagnostics)
* Wiring Repairs (Component Tests and General Diagnostics)
Scan Tool Reference
Control Module References (Programming and Relearning)for scan tool information.
Circuit/System Testing
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
1. Ignition OFF, disconnect the harness connector at the applicable front end sensor and the harness connector at the SDM.
2. Test for infinite resistance between the applicable impact sensor signal circuit terminal B and ground.
• If less than the specified value, test the circuit for a short to ground.
3. Ignition ON, test for less than 1 volt between the applicable impact sensor signal circuit terminal B and ground.
• If greater than the specified range, test the circuit for a short to voltage.
4. Ignition ON, test for less than 1 volt between the applicable impact sensor low reference circuit terminal A and ground.
• If greater than the specified range, test the circuit for a short to voltage.
5. Test for less then 1 ohm of resistance between the applicable impact sensor low reference circuit and the SDM.
• If greater than the specified range, test the circuit for an open/high resistance. If the circuits test normal, replace the applicable front end sensor.
6. Test for less then 1 ohm of resistance between the applicable impact sensor signal circuit and the SDM.
• If greater than the specified range, test the circuit for an open/high resistance. If the circuits test normal, replace the applicable front end sensor.
7. If all circuits test normal, replace the applicable impact sensor.
8. With a scan tool, clear DTCs.
9. Verify DTC B0083 or B0084 is not set.
• If DTC is set, replace the SDM.
Repair Instructions
* Inflatable Restraint Front End Sensor Replacement (Inflatable Restraint Front End Sensor Replacement)
* Control Module References (Programming and Relearning)for SDM replacement, setup, and programming
Repair Verification
Ignition ON, use the scan tool to clear the DTCs, then recheck for DTCs.
If DTC B0083 or B0084 was current, replace the SDM.