The inflatable restraint sensing and diagnostic module (SDM) contains a sensing device that converts vehicle velocity changes into an electrical signal. The SDM compares this electrical signal to a value stored in memory. When the generated signal exceeds the stored value, the SDM performs additional signal processing and compares the generated signals to values stored in memory. When 2 of the generated signals exceed the stored values, the SDM will cause current to flow through the deployment loops, deploying the air bags and/or pretensioners causing DTC B0052 or B0053 to set.

Ignition voltage is between 9-16 volts.

B0052

B0053

SDM commands inflators deployment with loop faults present.

After an air bag deployment or 3 separate pretensioner deployments the DTC becomes latched and cannot be cleared.

Important: The seat belt pretensioners may deploy for impacts that are not severe enough to warrant frontal or side air bag deployment. The SDM is capable of sustaining 3 pretensioner deployment events, or one frontal or side deployment event. After the maximum number of deployments has occurred, DTC B0052 sets and becomes a latched code, which cannot be cleared.

When DTC B0053 is accompanied by additional DTCs, other than B0052, repair the malfunction causing the other DTCs before replacing SDM.

Schematic Reference

SIR Schematics

Connector End View Reference

SIR Connector End Views

Description and Operation

SIR System Description and Operation

Electrical Information Reference

Scan Tool Reference

1. Ignition OFF, verify no signs of inflator module or pretensioner deployment exist.

⇒	If any signs of deployment exist, refer to Repairs and Inspections Required After a Collision .

2. With a scan tool, verify DTC B0052 or DTC B0053 is not set.

⇒	If the DTC is set, clear DTCs. If DTC resets, replace the SDM.

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.