DTC 083

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
When the ignition voltage is within the normal operating voltage range, the measured leakage currents to voltage or the resistance of the SIS loop are above a specified value caused by:
^ A short to voltage in the SIS loop
^ An open or a high resistance in the SIS loop

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
An inflatable restraint Side Impact Sensor (SIS) circuit open, high resistance, or short to voltage can cause an intermittent condition. Inspect the inflatable restraint side impact sensor high and sensor low circuits carefully for cutting and/or chafing.

TEST DESCRIPTION

Steps 1 - 11:

Steps 12 - 21:

The following numbers refer to the step numbers on the diagnostic table:
2. This step checks the inflatable restraint side impact sensor wiring harness connector.
4. This step checks the inflatable restraint side impact sensor.
6. This step checks the SDM wiring harness connector.
8. This step checks the SDM terminals.
10. This step checks for an open or a high resistance in the inflatable restraint side impact sensor circuit.
12. This step checks for an open or a high resistance in the inflatable restraint side impact sensor return circuit.
14. This step checks for a short to B+ in the inflatable restraint side impact sensor circuit.
16. This step determines if there is a short to B+ in the inflatable restraint side impact sensor return circuit or if there is a malfunctioning inflatable restraint side impact sensor.
19. This step determines if there is a malfunctioning SDM.