B0091

DTC B0091

Diagnostic Instructions

* Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure. Diagnostic System Check - Vehicle
* Review Strategy Based Diagnosis for an overview of the diagnostic approach.
* Diagnostic Procedure Instructions provides an overview of each diagnostic category.

DTC Descriptor

DTC B0091
- Active Switch Wrong State

Circuit/System 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.

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 the AIR BAG indicator ON 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.
* A scan tool CLEAR DTC command is issued.
* A history DTC will clear once 255 malfunction-free ignition cycles have occurred.

Diagnostic Aids

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

Circuit/System Testing

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. Refer to Repair Instructions.

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. Refer to Repair Instructions.

Repair Instructions

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

* Inflatable Restraint Instrument Panel Module Disable Switch Replacement
* For SDM replacement, setup, and programming. Refer to Programing and Relearning Programming and Relearning