Circuit Description
The sensing and diagnostic module (SDM) provides a two-wire interface for the side impact sensor (SIS). When the ignition is turned ON, SIS operation consists of 3 modes as power-up mode, ID mode and normal mode. During ID mode, the SIS sends a sequence of ID/traceability information to SDM. The power mode and ID mode must be completed within 5 seconds of the SIS being powered by SDM. If ID/traceability information is not received and verified within 5 seconds, SDM will set a DTC.
During normal mode, the SIS transmit a State Of Health (SOH) message once a second. If the SDM receives no SOH message for 5 seconds, the SDM will also set a DTC.
DTC Descriptor
This diagnostic procedure supports the following DTC:
DTC B0079 Incorrect Left SIS Installed
Conditions for Running the DTC
Ignition voltage is within the normal operating voltage range.
Conditions for Setting the DTC
A communication error occurs between the SDM and the driver side air bag sensor.
Action Taken When The DTC Sets
The SDM commands the AIR BAG indicator ON.
Conditions for Clearing the DTC
The condition responsible for setting the DTC no longer exists and the scan tool Clear DTCs function is used.
Step | Action | Yes | No |
|---|---|---|---|
|
Warning: Refer to Sensing and Diagnostic Module Handling Warning in the Preface section. Schematic Reference: SIR Schematics Connector End View Reference: Component Connector End Views | |||
1 | Did you perform the Diagnostic System Check - Vehicle? | Go to Step 2 | |
2 |
Is the air bag wiring damaged? | Go to Step 3 | Go to Step 4 |
3 | Repair or replace the air bag wiring. Is the repair complete? | Go to Step 5 | -- |
4 | Replace the driver side air bag sensor. Refer to Inflatable Restraint Side Impact Sensor Replacement. Did you complete the replacement? | Go to Step 5 | -- |
5 |
Does the DTC reset? | Go to Step 2 | System OK |
