DTC 85

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 ground in the passenger side air bag deployment loop are above a specified value.

DTC 85 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
An inflatable restraint passenger seat module circuit short-to-ground or a short circuit between the communication signal return line of the LH or RH inflatable restraint Side Impact Sensor can cause an intermittent condition. Inspect CKTs AM13 and XM14 carefully for cutting and/or chafing. A careful inspection of the circuits and components indicated on the DTC 85 Table is essential to make sure that the replacement SDM will not be damaged. Also inspect CKTs XB42 and XM430 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 passenger seat module 2-way integral harness connector.
4. This test isolates the malfunction to one side of the inflatable restraint passenger seat harness connector located under the RH front seat track cover.
11. This test determines whether the malfunction is in CKT AM13.
13. This test determines whether the malfunction is in CKT XM14.