Diagnostic Instructions
| • | Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure. |
| • | 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 StateDiagnostic Fault Information
Circuit | Short to Ground | Open/High Resistance | Short to Voltage | Signal Performance |
|---|---|---|---|---|
IPM - Disable Switch Signal | B0090, B0091 | B0090 | B0090 | B0090, B0091 |
IPM - Suppression Indicator Control | B0090, B0091 | B0090 | B0090 | B0090, B0091 |
IPM - Ignition 1 Voltage | B0090 | B0090 | B0090 | -- |
IPM - Ground | -- | B0090 | B0090 | B0090 |
Circuit/System Description
The inflatable restraint instrument panel module (IPM) disable switch circuit consists of an IPM disable switch, IPM disable switch indicator, IPM disable switch signal circuit, and IPM 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 IPM disable switch signal and the IPM suppression indicator control circuits of the SDM to determine the position of the IPM disable switch. If a malfunction is detected, a DTC will be stored in memory.
Conditions for Running the DTC
Ignition voltage is between 9-16 volts.
Conditions for Setting the DTC
The voltage at IPM disable switch signal is low with the IPM disable switch indicator ON and the voltage at IPM suppression indicator control is high for 500 milliseconds.
Action Taken When the DTC Sets
| • | The IPM disable switch is defaulted to a calibrated state. |
| • | The SDM requests the instrument panel cluster (IPC) to illuminate the AIR BAG indicator. |
| • | The SDM toggles the IPM 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 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 IPM disable switch signal and the IPM suppression indicator control circuits. Refer to Testing for Intermittent Conditions and Poor Connections .
Reference Information
Schematic Reference
Connector End View Reference
Description and Operation
SIR System Description and Operation
Electrical Information Reference
Scan Tool Reference
Control Module References for scan tool information
Circuit/System Testing
- Ignition OFF, disconnect the harness connector at the IPM disable switch.
- Disconnect the harness connector at the SDM.
- Ignition ON, test for less than 1 volt between the IPM disable switch signal circuit terminal A and ground.
- Ignition ON, test for less than 1 volt between the IPM suppression indicator control signal circuit terminal E and ground.
- Ignition OFF, test for infinite resistance between the IPM disable switch signal circuit terminal A and ground.
- Test for infinite resistance between the IPM suppression indicator control circuit terminal E and ground.
- If all circuits test normal, replace the IPM disable switch. If the DTC resets, replace the SDM.
| ⇒ | If greater than the specified range, test the switch signal circuit for a short to voltage. |
| ⇒ | If greater than the specified range, test the switch signal circuit for a short to voltage. |
| ⇒ | If less than the specified value, test the switch signal circuit for a short to ground. |
| ⇒ | If less than the specified value, test the indicator control circuit for a short to ground. |
Repair Instructions
Perform the Diagnostic Repair Verification after completing the diagnostic procedure.
| • | Control Module References for SDM replacement, setup, and programming |
