Supplemental Inflatable Restraint (SIR)

Wiring Diagram:

CIRCUIT DESCRIPTION
The inflatable restraint control module contains a sensing device that converts vehicle velocity changes to an electrical signal. The inflatable restraint control module processes the generated electrical signal and compares it to a value stored in memory. When the generated signal exceeds the stored value, the inflatable restraint control module performs additional signal processing and compares the generated signals to signals stored in memory. When two of the generated signals exceed the stored values, the inflatable restraint control module will cause current to flow through the inflator modules, deploying the air bags. DTC 53 will set instead of a DTC 51 when a deployment occurs while an inflator circuit fault is present that could possibly result in a non-deployment situation in one or both inflator modules.

CONDITIONS FOR SETTING THE DTC
The inflatable restraint control module detects a frontal crash, up to 30 degrees off the centerline of the vehicle. of sufficient force to warrant deployment of the air bags.

ACTION TAKEN WHEN THE DTC SETS
^ The inflatable restraint control module sets a diagnostic trouble code.
^ The inflatable restraint control module turns ON the AIR BAG warning lamp.
^ The inflatable restraint control module records crash data.

CONDITIONS FOR CLEARING THE DTC
DTC 53 is a latched code. You cannot clear a latched code. Replace the inflatable restraint control module after following the instructions in the diagnostic table.

DIANOSTIC AIDS
DTC 53 will be accompanied by another DTC (other than DTC 71). Repair the malfunction causing the other DTC(s) before installing a new inflatable restraint control module.

DTC TABLE TEST DESCRIPTION
Number(s) below refer to step number(s) on the diagnostic table.
2. If inflator module(s) has not deployed, DTC 53 may have set falsely.
3. If DTC 53 has set with no signs of frontal impact. the diagnostic trouble code has set falsely.