The inflatable restraint instrument panel (I/P) module disable switch circuit consists of an I/P module disable switch, I/P module disable switch indicator, I/P module disable switch signal circuit, and I/P module suppression indicator control circuit. When the ignition is turned ON, the inflatable restraint sensing and diagnostic module (SDM) performs tests to diagnose critical malfunctions within itself. The SDM monitors the voltage levels at the I/P module disable switch signal and the I/P module suppression indicator control circuits of the SDM to determine the position of the I/P module disable switch. If a malfunction is detected, a DTC will be stored.

Ignition 1 voltage is within the normal operating voltage range.

The voltage at I/P module disable switch signal is low with the I/P module disable switch indicator ON and the voltage at I/P module suppression indicator control is high for 500 milliseconds.

A short between the I/P module disable switch signal and I/P module suppression indicator control circuits can cause an intermittent condition.

Schematic Reference

SIR Schematics

Connector End View Reference

SIR Connector End Views

Electrical Information Reference

1. Ignition ON. Engine OFF. Operate the I/P module disable switch to verify that the scan tool ACTIVE SWITCH data parameter does not change state but remains ENABLED.
2. Engine OFF, disconnect the I/P module disable switch. Engine ON, observe the ACTIVE SWITCH data parameter.

⇒	If the scan tool displays DISABLED, replace the I/P module disable switch.

3. Test the I/P module disable signal and suppression indicator control circuits for a short. If the above condition is found, make the appropriate repair.
4. Reconnect all components, with ignition ON use the scan tool to clear DTC. Recheck for DTC. IF DTC B0091 resets, replace the SDM.

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.