B1045

Diagnostic Chart:

Wiring Diagram:

Circuit Description
The inflatable restraint sensing and diagnostic module (SDM) performs tests to diagnose critical malfunctions within itself when the ignition switch is turned ON. The SDM monitors the six firing loops to detect leakage currents to ground and system voltage in the frontal and side air bag inflator module and seat belt pretensioner circuits. The deployment loop resistances are measured to ensure they are within their respective normal resistance ranges. Upon passing these tests, and if the energy reserve is charged up, the firing transistors are tested. The SDM then goes into Continuous Monitoring mode. Refer to SERVICE AND REPAIR.

Conditions for Setting the DTC
DTC 45 will set once the following conditions are met. This test is run during the SDM Turn-ON tests.
- The ignition is within normal operating voltage range.
- An internal fault in the driver side impact sensor (SIS).
- An open circuit condition in the side impact sensor (SIS) circuit.
- A short circuit in the side impact sensor (SIS) circuit.
- A short to ground in the side impact (SIS) circuit.
- A short to voltage in the side impact sensor(SIS) circuit.

The driver side impact sensor (SIS) loop consists of the following components:
- The inflatable restraint side impact sensor (LH).
- The harness wiring of CKT 2131.
- The harness wiring of CKT 2132.
- The connector terminal contact.

Action Taken When the DTC Sets
- The SDM sets a Diagnostic Trouble Code.
- The SDM turns ON the AIR BAG warning lamp.

Conditions for Clearing the DTC
Current and History DTC codes must be cleared using a scan tool Clear DTC Information command. If the circuit fault has been successfully repaired and the conditions which caused the Current DTC B1045 to set are no longer existing, History DTC B1045 will set. History DTC B1045 may be cleared using the scan tool.

Diagnostic Aids
An inflatable restraint driver side impact sensor (SIS) circuit short to ground can cause an intermittent condition. Inspect CKT 2131 and CKT 2132 carefully for cutting and/or chafing. A careful inspection of the circuits and components indicated on the DTC B1045 Table is essential to make sure that the replacement SDM will not be damaged.

When measurements are requested in this table, use J 39200.

Test Description
The numbers below refer to the step numbers on the diagnostic table:
2. This test determines if the sensor is damaged.
4. This test checks for proper contact or corrosion of the yellow 2-way connector.
7. This test checks for proper contact or corrosion of the SDM harness connector.
12. This test checks for an open circuit or high resistance condition in CKT 2132
14. This test checks for an open circuit or high resistance condition in CKT 2131.
16. This test checks for a short between CKT 2131 and CKT 2132.
18. This test checks for a short to ground condition in CKT 2131.
20. This test checks for an short to ground condition in CKT 2132.
22. This test checks for a short to voltage condition in CKT 2132.
24. This test checks for a short to voltage condition in CKT 2131.