DTC Descriptors

DTC B0021 01: Right Front Side Deployment Loop Short to Battery

DTC B0021 02: Right Front Side Deployment Loop Short to Ground

DTC B0021 04: Right Front Side Deployment Loop Open Circuit

DTC B0021 0D: Right Front Side Deployment Loop Resistance Above Threshold

DTC B0021 0E: Right Front Side Deployment Loop Resistance Below Threshold

Diagnostic Fault Information

Important: Always perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure.

Circuit	Short to Ground	High Resistance	Open	Short to Voltage	Signal Performance
Side Impact Module - RF High Circuit	B0021 02	B0021 0D	B0021 04	B0021 01	B0021 0E
Side Impact Module - RF Low Circuit	B0021 02	B0021 0D	B0021 04	B0021 01	B0021 0E

Circuit/System Description

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 side impact module - RF. The SDM performs continuous diagnostic tests on the deployment loops to check for proper circuit continuity and for shorts to ground or voltage.

A shorting bar used within the side impact module - RF connector which will short together both side impact module - RF high and low circuits when the connector is disconnected. This will help to prevent unwanted deployment of the inflator module during servicing.

Conditions for Running the DTC

Ignition voltage is between 9-16 volts.

Conditions for Setting the DTC

B0021 01

The side impact module - RF high and/or low circuit is short to voltage for 120 milliseconds.

B0021 02

The side impact module - RF high and/or low circuit is short to ground for 120 milliseconds.

B0021 04

The side impact module - RF high and/or low circuit is open for 120 milliseconds.

B0021 0D

The side impact module - RF deployment loop resistance is more than 3.9 ohms for 120 milliseconds.

B0021 0E

The side impact module - RF deployment loop resistance is less than 1.1 ohms for 120 milliseconds.

Action Taken When the DTC Sets

Conditions for Clearing the DTC

Reference Information

Schematic Reference

SIR Schematics

Connector End View Reference

SIR Connector End Views

Electrical Information Reference

Special Tools Required

Circuit/System Testing

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

•	The side impact module - RF

•	The side impact module wiring harness

•	The SDM module

•	The side impact module - RF wiring harness connector

•	The side impact module wiring harness connector

•	The SDM wiring harness connector

1. Ignition OFF, disconnect the side impact module - RF wiring harness connector located under the driver front seat.
2. Use the EL 38715-150 adapter to connect the J 38715-A to the harness side of the side impact module - RF wiring harness connector. Use the PASSENGER INFLATOR connector located on the load tool.
3. Ignition ON, use a scan tool to observe the SIR DTC display. Verify DTC B0021 is set history.

⇒	If DTC B0021 is current, turn OFF the ignition and remove the SDM connector. Refer to SDM replacement in Repair Instructions for connector location.

⇒	Test and repair both side impact module - RF high and low circuits for a short to voltage, short to ground, or open/low resistance. If all circuits test normal, replace the SDM.

4. Ignition OFF, disconnect and remove the J 38715-A and adapter. Then connect the side impact module - RF wiring harness connector. Remove the side impact module - RF connector. Use the J 38715-30A adapter to connect the J 38715-A to the harness side of the side impact module - RF connector. Use the PASSENGER INFLATOR connector located on the load tool.
5. Ignition ON, use a scan tool to observe the SIR DTC display. Verify DTC B0021 is set history.

⇒	If DTC B0021 is current, replace the side impact module - RF wiring harness.

6. If DTC B0021 is history, replace the side impact module - RF.

Repair Instructions

Important: Always perform the Diagnostic Repair Verification after completing the diagnostic procedure.