Air Bag Indicator Circuit Malfunction
Air Bag Indicator Circuit MalfunctionDiagnostic Instructions
^ Perform the [Diagnostic System Check - Vehicle Diagnostic Information] prior to using this diagnostic procedure.
^ Review [Strategy Based Diagnosis] for an overview of the diagnostic approach. Strategy Based Diagnosis
^ [Diagnostic Procedure Instructions - Vehicle Diagnostic Information] provides an overview of each diagnostic category. Diagnostic Procedure Instructions - Vehicle Diagnostic Information
Circuit/System Description
When the ignition is turned ON, the instrument panel cluster (IPC) flashes the AIR BAG indicator 7 times. The inflatable restraint sensing and diagnostic module (SDM) performs diagnostic tests on the SIR system and then commands the IPC to turn the AIR BAG indicator OFF if no SIR malfunction exists. The AIR BAG indicator is controlled by the SDM via serial data communications. If the ignition 1 voltage is outside of the normal operating voltage range 9-16 volts, the SDM will command the IPC to turn the AIR BAG indicator ON with no DTCs present then disables all deployment loops.
Reference Information
Schematic Reference
[SIR Schematics]
Connector End View Reference
[SIR Connector End Views]
Description and Operation
[SIR System Description and Operation]
Electrical Information Reference
^ [Circuit Testing]
^ [Connector Repairs]
^ [Testing for Intermittent Conditions and Poor Connections]
^ [Wiring Repairs]
Scan Tool Reference
^ [Scan Tool Data List - SIR]
^ [Scan Tool Data Definitions - SIR]
Diagnostic Aids
A DTC B1370 may set if the ignition 1 circuit is outside the 9-16 volts range.
Circuit/System Testing
1. Ignition ON, with a scan tool, verify the Battery Voltage Parameter is 9-16 volts.
^ If not the specified range, refer to [Diagnostic System Check - Vehicle Diagnostic Information].
2. Cycle the key from OFF to ON, monitor the IPC. The SIR warning indicator should flash then turn OFF.
^ If the SIR warning indicator continually flashes, reprogram the SDM.
3. With a scan tool, perform the display test to Commanded the IPC indicators ON then OFF. The Air Bag indicator should cycle between the commanded states.
^ If the Air Bag indicator does not cycle between the commanded states, replace the IPC.
4. If tests are normal, replace the SDM.
Repair Instructions
Perform the [Diagnostic Repair Verification - Vehicle Diagnostic Information] after completing the diagnostic procedure.
^ [SIR/SRS Wiring Repairs]
^ [Control Module References] for IPC and SDM replacement, setup, and programming Programming and Relearning