DTC 76

Diagnostic Chart:

Wiring Diagram:

Circuit Description
The inflatable restraint Sensing and Diagnostic and Seat Belt Pretensioner 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 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 service wait time is 1 minute. Refer to Air Bag(s) Arming and Disarming.

Conditions for Setting the DTC
1. Neither of the two side air bag circuits is open.
2. The ignition is within normal operating voltage range.
3. The measured leakage currents to system voltage in the driver side air bag deployment loop are above a specified value.

DTC 76 will set once these conditions are met. This test is run during the SDM Turn-ON tests.

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 DTC to set are no longer existing, the DTC may be cleared using the scan tool.

Diagnostic Aids
A short circuit to a voltage source in the inflatable restraint driver seat module circuit or a short circuit between the communication signal line of the LH or RH inflatable restraint Side Impact Sensor can set this DTC. Inspect CKTs XB100 and AB11 carefully for cutting and/or chafing. A careful inspection of the circuits and components indicated on the DTC 76 Table is essential to make sure that the replacement SDM will not be damaged.

^ If DTC 73 and DTC 76 are set, inspect CKTs AB11 and B41 carefully for cutting and/or chafing.
^ If DTC 76 and DTC 83 are set, inspect CKTs AB11 and M44 carefully for cutting and/or chafing.

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

Test Description
The following numbers refer to the step numbers on the diagnostic table:

2. This test isolates the malfunction to one side of the inflatable restraint driver seat module yellow integral harness.
4. This test isolates the malfunction to one side of the inflatable restraint driver seat harness located under the LH front seat track cover.
11. This test determines whether the malfunction is in CKT AB11.
13. This test determines whether the malfunction is in CKT XB100.