B0083
DTC B0083 or B0084
Diagnostic Instructions
* Perform the Diagnostic System Check - Vehicle (Diagnostic System Check - Vehicle) prior to using this diagnostic procedure.
* Review Strategy Based Diagnosis (Strategy Based Diagnosis) for an overview of the diagnostic approach.
* Diagnostic Procedure Instructions (Diagnostic Procedure Instructions) provides and overview of each diagnostic category.
DTC Descriptors
DTC B0083 00
- Left Front Impact Sensor No Additional Information
DTC B0083 39
- Left Front Impact Sensor Internal Electronic Failure
DTC B0083 0F
- Left Front Impact Sensor Incorrect Component Installed
DTC B0083 3A
- Left Front Impact Sensor Invalid Serial Data Received
DTC B0084 00
- Right Front Impact Sensor No Additional Information
DTC B0084 39
- Right Front Impact Sensor Internal Electronic Failure
DTC B0084 0F
- Right Front Impact Sensor Incorrect Component Installed
DTC B0084 3A
- Right Front Impact Sensor Invalid Serial Data Received
Diagnostic Fault Information
Circuit/System Description
The front impact sensor utilizes a unidirectional 2-wire circuit. The front impact 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 impact sensor. When the ignition is turned ON and input power from the SDM is first detected, the front impact 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 impact sensor continually communicates status messages to the SDM, which determines if a fault is present in the front impact sensor circuit. When a fault is detected, the SDM may reset the front impact 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 impact sensor has been shorted to voltage, open, or shorted to ground.
* The front impact sensor current has been above 23 mA for longer than 5 milliseconds.
* The SDM has not received a message from the front impact sensor for more than 375 milliseconds.
B0083 39 or B0084 39
* The SDM has received a NOK message from the front impact sensor.
* The SDM has not received a message.
* The SDM has received invalid serial data from the front impact sensor.
B0083 0F or B0084 0F
The SDM has received erratic messages from the front impact sensor.
B0083 3A or B0084 3A
* The SDM has received an ID message from the front impact sensor, which does not match the ID stored in the SDM memory.
* The SDM has reset the front impact sensor twice without detecting the correct ID message.
Action Taken When the DTC Sets
* The SDM requests the instrument panel cluster (IPC) to illuminate the AIR BAG indicator.
* 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 (Circuit Testing)
* Connector Repairs (Connector Repairs)
* Testing for Intermittent Conditions and Poor Connections (Testing for Intermittent Conditions and Poor Connections)
* Wiring Repairs (Wiring Repairs)
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:
* Front impact sensor
* SDM
* Front impact sensor wiring harness connector
* SDM wiring harness connector
1. Ignition OFF, disconnect the harness connector at the applicable front impact sensor and the harness connector at the SDM.
2. Test for infinite resistance between the applicable impact sensor signal circuit terminal B (left) or terminal A (right) 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 (left) or terminal A (right) 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 (left) or terminal B (right) and ground.
• If greater than the specified range, test the circuit for a short to voltage.
5. Ignition ON, test for less than 1 volt between the low reference circuit terminal A (left) or terminal B (right) and ground.
• If greater than the specified range, test the low reference circuit for a short to voltage.
6. Test for less then 5 ohms between the appropriate signal circuit terminals listed below:
* Left front impact sensor terminal Band SDM terminal 38
* Right front impact sensor terminal A and SDM terminal 36
• If greater than the specified range, test the signal circuit for an open/high resistance.
7. Test for less then 5 ohms between the appropriate low control circuit terminals listed below:
* Left front impact sensor terminal A and SDM terminal 39
* Right front impact sensor terminal B and SDM terminal 37
• If greater than the specified range, test the control circuit for an open/high resistance.
8. If all circuits test normal, replace the appropriate impact sensor.
9. Clear DTCs and cycle the ignition OFF then ON. Verify the DTC B0083 or B0084 is not set.
• If the DTC sets, 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.