B0080

CIRCUIT DESCRIPTION

SIR Schematics: Standard Air Bags (Power, Grounds And Side Impact Sensors):

SIR Schematics: Standard Air Bags (Inflator Modules):

SIR Schematics: Dual Stage Air Bags (Power, Ground And Sensors):

SIR Schematics: Dual Stage Air Bags (Module Controls):

The inflatable restraint side impact sensor (SIS) - Left loop is a 2 wire circuit. When you first turn ON the ignition, the inflatable restraint sensing and diagnostic module (SDM) performs tests to diagnose critical malfunctions within itself. The SDM provides input power to the SIS. When input power is first detected, the SIS responds by performing internal diagnostics. Next the SIS 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
The SDM monitors the Left SIS loop with power on.
^ Left SIS will send an ID message to the SDM.
^ Left SIS will continuously send OK or NOK message to SDM.

CONDITIONS FOR RUNNING THE DTC
The SDM monitors the Left SIS loop with power on.

CONDITIONS FOR SETTING THE DTC
^ Ignition 1 Voltage is within the normal operating voltage range.
^ The SDM has received a NOK (not OK) message from the Left 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 Left SIS.
^ 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.

DIAGNOSTIC AIDS
Check to ensure that the proper Left SIS is installed into vehicle.

TEST DESCRIPTION

Steps 1-4:

The following numbers refer to the step numbers in the diagnostic table:
2. This test checks the communication status of the Left SIS.