B0084
DTC B0083-B0088
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 an overview of each diagnostic category.
DTC Descriptors
DTC B0083 02
- Front End Sensor 1 Short to Ground (Left)
DTC B0083 05
- Front End Sensor 1 Short to Battery or Open (Left)
DTC B0083 0F
- Front End Sensor 1 Erratic (Left)
DTC B0083 39
- Front End Sensor 1 Internal Electronic Failure (Left)
DTC B0083 3A
- Front End Sensor 1 Incorrect Component Installed (Left)
DTC B0083 71
- Front End Sensor 1 Invalid Serial Data Received (Left)
DTC B0084 02
- Front End Sensor 2 Short to Ground (Right)
DTC B0084 05
- Front End Sensor 2 Short to Battery or Open (Right)
DTC B0084 0F
- Front End Sensor 2 Erratic (Right)
DTC B0084 39
- Front End Sensor 2 Internal Electronic Failure (Right)
DTC B0084 3A
- Front End Sensor 2 Incorrect Component Installed (Right)
DTC B0084 71
- Front End Sensor 2 Invalid Serial Data Received (Right)
DTC B0085 02
- LF Side Impact Sensor Short to Ground
DTC B0085 05
- LF Side Impact Sensor Short to Battery or Open
DTC B0085 0F
- LF Side Impact Sensor Erratic
DTC B0085 39
- LF Side Impact Sensor Internal Electronic Failure
DTC B0085 3A
- LF Side Impact Sensor Incorrect Component Installed
DTC B0085 71
- LF Side Impact Sensor Invalid Serial Data Received
DTC B0086 02
- RF Side Impact Sensor Short to Ground
DTC B0086 05
- RF Side Impact Sensor Short to Battery or Open
DTC B0086 0F
- RF Side Impact Sensor Erratic
DTC B0086 39
- RF Side Impact Sensor Internal Electronic Failure
DTC B0086 3A
- RF Side Impact Sensor Incorrect Component Installed
DTC B0086 71
- RF Side Impact Sensor Invalid Serial Data Received
Diagnostic Fault Information
Circuit/System Description
The inflatable restraint discriminating sensors utilizes a unidirectional 2-wire circuit. The 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 each of the sensors. When the ignition is turned ON and input power from the SDM is first detected, each 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 sensors continually communicates status messages to the SDM, which determines if a fault is present in the sensor or circuit. When a fault is detected, the SDM may reset the appropriate 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 02, B0084 02, B0085 02, or B0086 02
* The sensor signal circuit is shorted to ground.
* The front end sensor current has been above 23mA for longer than 5 milliseconds.
B0083 05, B0084 05, B0085 05, or B0086 05
* The sensor signal circuit is shorted to voltage or open.
* The sensor low reference circuit is open.
* The SDM has not received a message from the front end sensor for more than 375 milliseconds.
B0083 0F, B0084 0F, B0085 0F, or B0086 0F
The SDM has received erratic messages from the sensor.
B0083 39, B0084 39, B0085 39, or B0086 39
* The SDM has received a NOK message from the sensor.
* The SDM has not received a message.
B0083 3A, B0084 3A, B0085 3A, or B0086 3A
* The SDM has received an ID message from the sensor which does not match the ID stored in the SDM memory.
* The SDM has reset the sensor twice without detecting the correct ID message.
B0083 71, B0084 71, B0085 71, or B0086 71
The SDM has received invalid serial data from the sensor.
Action Taken When the DTC Sets
* The SDM illuminates 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 255 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)
Description and Operation
SIR System Description and Operation (Description and Operation)
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 impact sensor
* The SDM module
* The impact sensor wiring harness connector
* The SDM wiring harness connector
1. Ignition OFF, disconnect the harness connector at the appropriate impact sensor and the harness connector at the SDM.
2. Test for infinite resistance between the signal circuit terminal B and ground.
• If less than the specified range, test the signal circuit for a short to ground.
3. Ignition ON, test for less than 1 volt between the signal circuit terminal B and ground.
• If greater than the specified range, test the circuit for a short to voltage.
4. Test for less then 1 ohm between the appropriate low reference circuit terminal at the sensor and the appropriate low reference circuit terminal at the SDM:
* Left Front Sensor - Low Reference circuit terminal A at the sensor and the low reference circuit terminal 38 at the SDM.
* Right Front End Sensor - Low Reference circuit terminal A at the sensor and the low reference circuit terminal 39 at the SDM.
* Left Side Sensor - Low Reference circuit terminal A at the sensor and the low reference circuit terminal 40 at the SDM.
* Right Side Sensor - Low Reference circuit terminal A at the sensor and the low reference circuit terminal 41 at the SDM.
• If greater than the specified range, test the circuit for an open/high resistance.
5. Test for less then 1 ohm between the appropriate signal circuit terminal at the sensor and the appropriate signal circuit terminal at the SDM:
* Left Front Sensor - Signal circuit terminal B at the sensor and the signal circuit terminal 36 at the SDM.
* Right Front End Sensor - Signal circuit terminal B at the sensor and the signal circuit terminal 37 at the SDM.
* Left Side Sensor - Signal circuit terminal B at the sensor and the signal circuit terminal 42 at the SDM.
* Right Side Sensor - Signal circuit terminal B at the sensor and the signal circuit terminal 43 at the SDM.
• If greater than the specified range, test the circuit for an open/high resistance.
6. If all circuits test normal, replace the impact sensor.
7. With a scan tool, clear DTCs and operate the vehicle within the condition for running the DTC. Verify DTC B0084, B0085, or B0086 does not set.
• If any of the DTCs set, replace the SDM.
Repair Instructions
Perform the Diagnostic Repair Verification (Verification Tests) after completing the diagnostic procedure.
* SIR/SRS Wiring Repairs (Component Tests and General Diagnostics)
* Inflatable Restraint Front End Sensor Replacement (Inflatable Restraint Front End Sensor Replacement)
* Inflatable Restraint Side Impact Sensor Replacement - Center Pillar (Inflatable Restraint Side Impact Sensor Replacement - Center Pillar)
* Inflatable Restraint Side Impact Sensor Replacement - Rear Side Door (Inflatable Restraint Side Impact Sensor Replacement - Rear Side Door)
* Control Module References (Programming and Relearning)for SDM replacement, setup, and programming