B0091

CIRCUIT DESCRIPTION
The inflatable restraint 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.

CONDITIONS FOR RUNNING THE DTC
Ignition 1 voltage is within the normal operating voltage range.

CONDITIONS FOR SETTING THE DTC
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.

ACTION TAKEN WHEN THE DTC SETS
- The I/P module disable switch is defaulted to a calibrated state.
- The SDM commands ON the AIR BAG indicator via Class 2 serial data.
- The SDM toggles the I/P module disable switch AIR BAG indicator ON and OFF every 5 seconds.

CONDITIONS FOR CLEARING THE DTC
- The condition responsible for setting the DTC no longer exists.
- You issue a scan tool CLEAR DTCs command.
- A history DTC will clear once 255 malfunction free ignition cycles have occurred.

DIAGNOSTIC AIDS
The following can cause an intermittent condition:

A short between the I/P module disable switch signal and the I/P module suppression indicator control circuits. Refer to Diagnostic Aids for Circuit Testing and Wiring Repair Procedures.

TEST DESCRIPTION

Steps 1-4:

Steps 5-9:

Steps 10-11:

The numbers below refer to the step numbers on the diagnostic table.
3. Observes the state of the I/P module disable switch, normal state being ON.
4. Tests for a malfunctioning I/P module disable switch.
5. Tests for a malfunctioning SDM.
6. Tests for a short in the I/P module disable switch signal circuit.
7. Tests for a short in the I/P module suppression indicator control circuit.