B1488

DTC B1488

Diagnostic Instructions

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

DTC Descriptor
DTC B1488
- Passenger Instrument Panel Air Bag Frontal Deployment Loop Stage 2 Short to Battery

Diagnostic Fault Information





Circuit/System Description

If a malfunction is detected, a DTC will be stored in non-volatile memory. During a side or frontal crash of sufficient force the inflatable restraint sensing and diagnostic module (SDM) will allow current to flow through the deployment loop in order to deploy the passenger instrument panel air bag. The SDM performs continuous diagnostic tests on the deployment loops to check for proper circuit continuity and for shorts to ground or voltage. There are 2 shorting bars used within the passenger instrument panel air bag connector which will short together both passenger instrument panel air bag stage 1 high and low circuits, and both passenger instrument panel air bag stage 2 high and low circuits, when the connector is disconnected. This will help to prevent unwanted deployment of the air bag or pretensioner during servicing.

Conditions for Running the DTC

Ignition voltage is between 9-16 volts.

Conditions for Setting the DTC

The passenger instrument panel air bag high and/or low circuit is short to voltage.

Action Taken When the DTC Sets

The SDM commands the AIR BAG indicator ON.

Conditions for Clearing the DTC

* The condition responsible for setting the DTC no longer exists and the scan tool Clear DTCs function is used.
* A history DTC will clear once 255 malfunction-free ignition cycles have occurred.

Reference Information
Schematic Reference

SIR Schematics (without WHB) (SIR Schematics (without WHB))SIR Schematics (WHB) (SIR Schematics (WHB))
Connector End View Reference

Component Connector End Views (Connector End Views By Name)
Electrical Information Reference

* Circuit Testing (Circuit Testing)
* Connector Repairs (Connector Repairs)
* Testing for Intermittent Conditions and Poor Connections (Testing for Intermittent Conditions and Poor Connections)
* Wiring Repairs (Wiring Repairs)

Circuit/System Testing

Note: When removing connectors inspect for damage or corrosion. Damage or corrosion in the following requires repair or replacement of the affected component/connector.

* Passenger instrument panel air bag
* SDM
* Passenger instrument panel air bag wiring harness connector
* SDM wiring harness connector

1. Ignition OFF, disconnect passenger instrument panel air bag connector.
2. Disconnect the SDM connector.
3. Test the high and low circuits between the SDM and passenger instrument panel air bag for a short to voltage. Verify that a short to voltage does not exist.

• If the above condition is found make the appropriate repair.

4. If all circuits test normal then replace the SDM.
5. Ignition ON, use a scan tool to observe the SIR DTC display. Verify DTC B1488 is set current.

• If DTC B1488 sets replace the passenger instrument panel air bag.

Repair Instructions

Perform the Diagnostic Repair Verification (Verification Tests) after completing the diagnostic procedure.

* Instrument Panel Inflatable Restraint Module Replacement (Hatchback) (Instrument Panel Inflatable Restraint Module Replacement (Hatchback))Instrument Panel Inflatable Restraint Module Replacement (Notchback) (Instrument Panel Inflatable Restraint Module Replacement (Notchback))
* Control Module References (Programming and Relearning) for SDM replacement, setup, and programming