B0080

Schematic:

CIRCUIT DESCRIPTION
When you first turn the ignition switch to the RUN position, the inflatable restraint sensing and diagnostic module (SDM) performs tests to diagnose critical malfunctions within itself. The SDM provides input power to the Side Impact Sensor (SIS). When input power is first detected, the SIS responds by performing internal diagnostics. The SIS then sends an ID message to the SDM. The SDM will consider this to be a valid ID if the response time is less than 5 seconds after the SIS is powered up.The SIS will continually communicate a status message to the SDM. The SDM can reset the SIS by removing and applying power to it.

CONDITIONS FOR RUNNING THE DTC
^ Ignition 1 voltage is within the normal operating voltage range.
^ The LF SIS sends an ID message to the SDM.
^ The LF SIS continuously sends an OK or NOK message to SDM.

CONDITIONS FOR SETTING THE DTC
The SDM has received a NOK (not OK) message from the LF SIS.

ACTION TAKEN WHEN THE DTC SETS
The SDM commands ON the AIR BAG warning lamp via Class 2 serial data.

CONDITIONS FOR CLEARING THE DTC
^ Replace the LF side impact sensor (SIS).
^ You issue a scan tool CLEAR CODES command.
^ A history DTC will clear once 255 malfunction free ignition cycles have occurred.

When the SDM detects that no DTCs are present, the SDM commands the AIR BAG warning lamp OFF.

TEST DESCRIPTION

Test Step 1 - Step 4:

The following numbers refer to the step numbers in the diagnostic table:
2. Tests the communication status of the LF inflatable restraint side impact sensor (SIS).