B0080
DTC B0077, B0078, B0079, B0080, B0081, or B0082
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 B0077
- Left Front Side Impact Sensor (SIS) Performance
DTC B0078
- Right Front Side Impact Sensor (SIS) Performance
DTC B0079
- Incorrect Left Front Side Impact Sensor (SIS) Installed
DTC B0080
- Discard Left Front Side Impact Sensor (SIS)
DTC B0081
- Incorrect Right Front Side Impact Sensor (SIS) Installed
DTC B0082
- Discard Right Front Side Impact Sensor (SIS)
Diagnostic Fault Information
Circuit/System Description
The inflatable restraint side impact sensor utilizes a unidirectional 2-wire circuit. The side impact sensor modulates current on the interface to send ID, state of health, and deployment commands to the Inflatable Restraint Sensing and Diagnostic Module. The Inflatable Restraint Sensing and Diagnostic Module serves as a power source and a ground for the side impact sensor. When the ignition is turned ON and input power from the Inflatable Restraint Sensing and Diagnostic Module is first detected, the side impact sensor responds by performing internal diagnostics and sending an ID to the Inflatable Restraint Sensing and Diagnostic Module. The Inflatable Restraint Sensing and Diagnostic Module considers the ID to be valid if the response time is less than 5 seconds. The side impact sensor continually communicates status messages to the Inflatable Restraint Sensing and Diagnostic Module, which determines if a fault is present in the side impact sensor circuit. When a fault is detected, the Inflatable Restraint Sensing and Diagnostic Module resets the side impact sensor twice by removing and reapplying power to it. If the fault is still present, the Inflatable Restraint Sensing and Diagnostic Module 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:
B0077 for side impact sensor - Left Front or B0078 for side impact sensor - Right Front
* A valid ID message is not received within 5 seconds of the side impact sensor being powered up.
* The Inflatable Restraint Sensing and Diagnostic Module has not received a message from the side impact sensor for more than 375 milliseconds.
* The Inflatable Restraint Sensing and Diagnostic Module has reset the side impact sensor twice without detecting a valid ID message.
B0079 for side impact sensor - Left Front or B0081 for side impact sensor - Right Front
* The Inflatable Restraint Sensing and Diagnostic Module has received an ID message from the side impact sensor which does not match the ID stored in the Inflatable Restraint Sensing and Diagnostic Module memory.
* The Inflatable Restraint Sensing and Diagnostic Module has reset the side impact sensor twice without detecting a correct ID message.
B0080 for side impact sensor - Left Front or B0082 for side impact sensor - Right Front
The Inflatable Restraint Sensing and Diagnostic Module has received a NOT OK message from the side impact sensor.
Action Taken When the DTC Sets
* The Inflatable Restraint Sensing and Diagnostic Module requests the instrument cluster 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 and the scan tool Clear DTCs function is used.
* 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 5 Bow Lowered Switch (CM7)
Description and Operation
SIR System Description and Operation Description and Operation
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
* SIR/SRS Wiring Repairs SIR/SRS Wiring Repairs
Scan Tool Reference
Control Module References Control Module References for scan tool information.
Circuit/System Testing
Note: When removing connectors, inspect for damage or corrosion. Damage or corrosion in the following requires repair or replacement of the affected component/connector.
* Side Impact Sensor
* Inflatable Restraint Sensing and Diagnostic Module
* Side Impact Sensor wiring harness connector
* Inflatable Restraint Sensing and Diagnostic Module wiring harness connector
1. Verify DTC B0079, B0080, B0081, or B0082 is not set.
• If DTC is set , replace the applicable impact sensor.
2. Disconnect the harness connector at the applicable impact sensor and the Inflatable Restraint Sensing and Diagnostic Module.
3. Test for infinite resistance between the applicable impact sensor signal circuit terminal A and ground.
• If less than the specified value, test the circuit for a short to ground.
4. Ignition ON, test for less than 1 volt between the applicable impact sensor signal circuit terminal A 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 applicable impact sensor voltage circuit terminal B and ground.
• If greater than the specified range, test the circuit for a short to voltage.
6. Test for less then 1 ohm between the applicable impact sensor and Inflatable Restraint Sensing and Diagnostic Module signal circuit terminals listed below:
* Left front side impact sensor terminal B and Inflatable Restraint Sensing and Diagnostic Module terminal 7
* Right front side impact sensor terminal B and Inflatable Restraint Sensing and Diagnostic Module terminal 8
• If greater than the specified range, test the circuit for an open/high resistance.
7. Test for less then 1 ohm between the applicable impact sensor and Inflatable Restraint Sensing and Diagnostic Module voltage circuit terminals listed below:
* Left front side impact sensor terminal A and Inflatable Restraint Sensing and Diagnostic Module terminal 28
* Right front side impact sensor terminal A and Inflatable Restraint Sensing and Diagnostic Module terminal 29
• If greater than the specified range, test the circuit for an open/high resistance.
8. If the circuits test normal, replace the applicable impact sensor.
9. Reconnect all SIR components
10. Verify DTC B0077 or B0078 is not set.
• If DTC is set, replace the Inflatable Restraint Sensing and Diagnostic Module.
Repair Instructions
* Inflatable Restraint Side Impact Sensor Replacement Inflatable Restraint Side Impact Sensor Replacement
* SIR/SRS Wiring Repairs SIR/SRS Wiring Repairs
* Control Module References Control Module References for Inflatable Restraint Sensing and Diagnostic Module replacement, setup, and programming