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| • | Perform the Diagnostic System Check - Vehicle prior to using the diagnostic procedure. |
| • | Review Strategy Based Diagnosis for an overview of the diagnostic approach. |
| • | Diagnostic Procedure Instructions provides an overview of each diagnostic category. |
Circuit | Short to Ground | High Resistance | Open | Short to Voltage | Signal Performance |
|---|---|---|---|---|---|
Left Front Side Impact Sensor Signal Circuit | -- | -- | B0085 05 | - | B0085 71 |
Left Front Side Impact Sensor Low Reference | B0085 02 | B0085 05 | B0085 05 | B0085 05 | B0085 71 |
The side impact sensor (SIS) utilises a unidirectional 2-wire circuit. The SIS modulates current on the interface to send ID, state of health (SOH), and deployment commands to the inflatable restraint sensing and diagnostic module (SDM). The SDM serves as a power source and a ground for the SIS. When the ignition is turned ON and input power from the SDM is first detected, the SIS 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 SIS continually communicates status messages to the SDM, which determines if a fault is present in the SIS circuit. When a fault is detected, the SDM resets the SIS twice by removing and reapplying power to it. If the fault is still present, the SDM will set a DTC.
Ignition voltage is between 9-16 volts.
All of the following conditions exist for 2.5 seconds:
| • | The wiring of the SIS is open or shorted to voltage/ground for 500 milliseconds. |
| • | The wiring of the SIS is shorted to voltage for 500 milliseconds. |
| • | A valid ID message is not received within 5 seconds of the SIS being powered up. |
| • | The SDM has not received a message from the SIS for more than 375 milliseconds. |
| • | The SDM has reset the SIS twice without detecting a valid ID message. |
| • | The SDM has received an ID message from the SIS which does not match the ID stored in the SDM memory. |
| • | The SDM has reset the SIS twice without detecting a correct ID message. |
The SDM has received a NOK message from the SIS.
| • | The SDM commands the AIR BAG indicator ON via serial data communications. |
| • | The SIR system is disabled and no deployments are allowed. |
| • | 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. |
Note: When removing connectors, inspect for damage or corrosion. Damage or corrosion in the following requires repair or replacement of the affected component/connector. • SIS • SDM • SIS wiring harness connector • SDM wiring harness connector
| ⇒ | If DTC B0085 39 or B0085 3A is set current, replace the left front side impact sensor. |
| ⇒ | If any of the above conditions are found, make the appropriate repair. |
| ⇒ | If DTC B0085 was current, replace the left front side impact sensor. After replacement, refer to Repair Verification. |
| • | Control Module References for SDM replacement, setup, and programming |
Ignition ON, use the scan tool to clear the DTCs then recheck for DTCs. Verify no DTCs are set.
| ⇒ | If DTC B0085 was current, replace the SDM. |
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