Ignition ON, the IPC commands the SIR indicator flashing for 7 times.

SIR SDM performs SIR diagnostic test. If there is no SIR malfunction, SDM will command the IPC to turn off the SIR indicator. The SDM controls the AIR BAG indicator via serial data communications. If voltage of ignition 1 exceeds 9-16 volts, the SDM will commands the IPC to turn on SIR indicator but no DTC will set, then the deployment loop will be disabled.

Schematic Reference

SIR Schematics

Connector End View Reference

SIR Connector End Views

If ignition 1 voltage exceeds 9-16 volts, DTC B1370 may set.

1. Ignition ON, use the scan tool to request the SIR data list display. Observe the voltage parameter of the battery. Battery voltage reading in the scan tool will be 9-16 volts.

⇒	If the voltage is less than 9 volts, refer to Diagnostic System Check - Vehicle .

2. Ignition ON, monitor the IPC. SIR warning lamp will flash and then off. Check and verify if the SIR warning lamp flashes and then off.

⇒	If the SIR warning lamp flashes continuously, reprogram the SDM. Refer to Inflatable Restraint Sensing and Diagnostic Module Programming and Setup

3. Use the scan tool, go to Body and Accessories, choose Special Functions to Instrument Panel Cluster, select Display Test. Command ON in Display Test may turn on or off all IPC indicators. When IPC indicators are turned on, SIR indicator will on.

⇒	If not, replace the IPC.

Important: SIR indicator cannot be serviced separately. IPC must be serviced or replaced as an entire set.

4. If the scan tool can turn on and off the SIR indicator, replace the SDM.

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

Refer to Control Module References for IPC replacement, setup and programming