DTC 071

CIRCUIT DESCRIPTION

SIR Schematics: Power, Ground, Serial Data, Indicator and Front Inflatable Restraint Modules:

SIR Schematics: Seat Belt Pretensioners, Side Inflatable Restraint Modules, and Sensors:

When the ignition is turned ON, the Inflatable Restraint Sensing And Diagnostic Module (SDM) performs tests to diagnose critical malfunctions within itself. Then, the SDM provides input power to the Inflatable Restraint Side Impact Sensor (SIS) - LF. When the input power is detected, the SIS responds by performing internal diagnostics. After that, 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
Ignition 1 voltage is within the normal operating voltage range.

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

ACTION TAKEN WHEN THE DTC SETS
^ The SDM turns the AIR BAG indicator ON
^ The SDM attempts to reset the SIS

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.

DIAGNOSTIC AIDS
DTC 71 is an indication of an internal malfunction within the SIS.

TEST DESCRIPTION

Steps 1-5:

The numbers below refer to the step numbers on the diagnostic table:
2. Tests to see if the LH SIS MESSAGE STATUS parameter is OK.