DTC 071

Schematic:

CIRCUIT DESCRIPTION
When you first turn ON the ignition, the inflatable restraint sensing and diagnostic and seat belt pretensioner module (SDM) performs tests to diagnose critical malfunctions within itself. Then, the SDM proceeds with the RESISTANCE MEASUREMENT test to measure the deployment loop resistances to ensure they are within their respective normal resistance ranges. Upon passing these tests, the energy reserve is charged and the firing transistors are tested. The SDM then goes into CONTINUOUS MONITORING mode. The SDM provides input power to the inflatable restraint side impact sensor (SIS). When input power is first detected, the SIS responds by performing internal diagnostics. Next, the SIS sends a OK/NOK message to the SDM to indicate proper operation.

CONDITIONS FOR RUNNING THE DTC
When the ignition voltage is within the normal operating voltage range, the SDM monitors the inflatable restraint side impact sensor and the circuits.

CONDITIONS FOR SETTING THE DTC
The DTC will set when an internal fault within the SIS has been detected by the SDM.

ACTION TAKEN WHEN THE DTC SETS
The SDM turns ON the AIR BAG warning lamp.

CONDITIONS FOR CLEARING THE DTC
^ Current DTC
- The SDM has detected correct operation
- The SIS sends an OK message to the SDM
^ History DTC
- You can issue a clear codes command
- Once 255 malfunction free ignition cycles have occurred

DIAGNOSTIC AIDS
This DTC is an indication of an internal failure within the SIS.

TEST DESCRIPTION

Diagnostic Chart:

The following numbers refer to the step numbers in the diagnostic table:
2. This step checks to see if either DTC 73 or DTC 74 is present.
4. This step determines if there is a malfunctioning inflatable restraint Side Impact Sensor (SIS) or if there is a malfunctioning SDM.