B0090

DTC B0090

CIRCUIT DESCRIPTION
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.

DTC DESCRIPTOR
This diagnostic procedure supports the following DTC:
DTC B0090 Active Switch Voltage Out of Range

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 and I/P module suppression indicator control is low or high with the I/P module disable switch indicator OFF for 500 milliseconds.

ACTION TAKEN WHEN THE DTC SETS
- The I/P module disable switch is defaulted to a calibration state.
- The SDM commands the AIR BAG indicator ON via class 2 serial data.

CONDITIONS FOR CLEARING THE DTC
- The condition responsible for setting the DTC no longer exists.
- You issue a scan tool CLEAR DTC 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 I/P module suppression indicator control circuits.

TEST DESCRIPTION

Steps 1-12:

Step 13:

The numbers below refer to the step numbers on the diagnostic table:
5. Tests for an open or high resistance in the I/P module disable switch power feed circuit.
6. Tests for an open or high resistance in the I/P module disable switch ground circuit.
8. Tests for an open or high resistance in the I/P module disable switch signal circuit.
9. Tests for a short in the I/P module disable switch signal circuit.
10. Tests for short in the I/P module suppression indicator control circuit.
11. Tests for an open or high resistance in the I/P module suppression indicator control circuit.