B0084
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 an overview of each diagnostic category.
DTC Descriptors
DTC B0083 01
- Left Front Impact Sensor Short to Battery
DTC B0083 02
- Left Front Impact Sensor Short to Ground
DTC B0083 05
- Left Front Impact Sensor Short to Battery or Open
DTC B0083 0F
- Left Front Impact Sensor Erratic
DTC B0083 39
- Left Front Impact Sensor Internal Electronic Failure
DTC B0083 3A
- Left Front Impact Sensor Incorrect Component Installed
DTC B0083 71
- Left Front Impact Sensor Invalid Serial Data
DTC B0084 01
- Right Front Impact Sensor Short to Battery
DTC B0084 02
- Right Front Impact Sensor Short to Ground
DTC B0084 05
- Right Front Impact Sensor Short to Battery or Open
DTC B0084 0F
- Right Front Impact Sensor Erratic
DTC B0084 39
- Right Front Impact Sensor Internal Electronic Failure
DTC B0084 3A
- Right Front Impact Sensor Incorrect Component Installed
DTC B0084 71
- Right Front Impact Sensor Invalid Serial Data Received
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
All of the following conditions exist for 2.5 seconds:
B0083 01 or B0084 01
The front impact sensor has been shorted to voltage.
B0083 02 or B0084 02
* The front impact sensor has been shorted to ground.
* The front impact sensor current is greater than 23 mA for longer than 5 milliseconds.
B0083 05 or B0084 05
* The front impact sensor has been shorted to voltage.
* The front impact sensor circuit is open.
* The SDM has not received a message from the front impact sensor for more than 375 milliseconds.
B0083 0F or B0084 0F
The SDM has received erratic messages from the front impact sensor.
B0083 39 or B0084 39
* The SDM has received a NOK message from the front impact sensor.
* The SDM has not received a message.
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.
B0083 71 or B0084 71
The SDM has received invalid serial data from the front impact sensor.
Action Taken When the DTC Sets
* The SDM requests the instrument panel cluster (IPC) to illuminate the AIR BAG indicator.
* The SIR System is disabled and no deployments are allowed.
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 ([1][2]Air Bag Systems)
Connector End View Reference
Component Connector End Views (Connector End Views By Name)
Description and Operation
SIR System Description and Operation (Description and Operation)
Electrical Information Reference
* Circuit Testing (Circuit Testing)
* Testing for Intermittent Conditions and Poor Connections (Testing for Intermittent Conditions and Poor Connections)
* Connector Repairs (Connector Repairs)
* Wiring Repairs (Wiring Repairs)
Scan Tool Reference
Control Module References (Programming and Relearning)for scan tool information.
Circuit/System Testing
Important: Refer to SIR Service Precautions (Service Precautions).
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 applicable front impact sensor connector.
2. Disconnect the harness connector at the SDM.
3. Ignition ON, test for less than 1 volt between the front 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 front 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. Test for infinite resistance between the front impact sensor signal circuit terminal B (left) or terminal A (right) and ground.
• If less than infinite resistance, test the circuit for a short to ground.
6. Test for less then 1 ohm between the following front impact sensor signal circuit terminals.
* Right front impact sensor terminal A and SDM harness connector terminal 39.
* Left front impact sensor terminal B and SDM harness connector terminal 36.
• If greater than the specified range, test the circuit for an open/high resistance.
7. Test for less then 1 ohm between the following front impact sensor low reference circuit terminals.
* Right front impact sensor terminal B and SDM harness connector terminal 37.
* Left front impact sensor terminal A and SDM harness connector terminal 38.
• If greater than the specified range, test the circuit for an open/high resistance.
8. If all circuits test normal, replace the applicable front impact sensor.
9. Reconnect all SIR components. Ignition ON, with a scan tool clear and recheck for DTCs.
• If the front impact sensor DTC returns and is current, replace the SDM.
Repair Instructions
Perform the Diagnostic Repair Verification (Verification Tests) after completing the diagnostic procedure.
* Inflatable Restraint Front End Sensor Replacement (Inflatable Restraint Front End Sensor Replacement)
* SIR/SRS Wiring Repairs (SIR/SRS Wiring Repairs)
* Control Module References (Programming and Relearning)for SDM replacement, setup, and programming