Diagnostic Instructions

DTC Descriptors

DTC B0021 01: Passenger Side Deployment Loop Stage 1 Short to Battery

DTC B0021 02: Passenger Side Deployment Loop Stage 1 Short to Ground

DTC B0021 08: Passenger Side Deployment Loop Stage 1 Signal Invalid

DTC B0021 0D: Passenger Side Deployment Loop Stage 1 Resistance Above Threshold

DTC B0021 0E: Passenger Side Deployment Loop Stage 1 Resistance Below Threshold

Diagnostic Fault Information

Circuit	Short to Ground	High Resistance	Low Resistance	Short to Voltage	Open
Driver Side Module High Control	B0014 02	B0014 0D	B0014 0E	B0014 01	B0014 08
Driver Side Module Low Control	B0014 02	B0014 0D	B0014 0E	B0014 01	B0014 08
Passenger Side Module High Control	B0021 02	B0021 0D	B0021 0E	B0021 01	B0021 08
Passenger Side Module Low Control	B0021 02	B0021 0D	B0021 0E	B0021 01	B0021 08

Circuit/System Description

During a side impact event 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 modules. The SDM performs continuous diagnostic tests on the deployment loops to check for correct circuit continuity and for shorts to ground or voltage. There is a shorting bar used within the side impact modules coil connector which will short together the side impact module high circuit and side impact module low circuit 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 high and/or low control circuit is shorted to voltage for 2 seconds.

B0021 02

The side impact module high and/or low control circuit is shorted to ground for 2 seconds.

B0021 08

The side impact module high and/or low control circuit is invalid during SDM initialization.

B0021 0D

The side impact module deployment loop resistance is more than 5.5 ohms for 2 seconds.

B0021 0E

The side impact module deployment loop resistance is less than 1.1 ohms for 2 seconds.

Action Taken When the DTC Sets

Conditions for Clearing the DTC

Reference Information

Schematic Reference

SIR Schematics

Connector End View Reference

Component Connector End Views

Electrical Information Reference

Scan Tool Reference

Control Module References for scan tool information

Circuit/System Testing

Important: Refer to SIR Service Precautions.

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

•	Side impact module- passenger

•	SDM module

•	Side impact module wiring harness connector

•	SDM wiring harness connector

Important: The connector and connector position assurance (CPA) may seat independent of each other. Both the connector and CPA should seat with an audible and/or tactile click. The CPA isolates the shoring-bars within the connector allowing the deployment circuit to operate properly.

1. Ignition OFF, disconnect the harness connector at the passenger inflatable restraint side impact module.
2. Ignition ON, verify that the scan tool Passenger Side Airbag Squib Circuit Resistance parameter is greater than 5.4 ohms at the control circuits.

⇒	If less than the specified range, test the control circuits for a short to ground. If the circuits test normal, replace the SDM.

3. Connect a fused jumper wire in between the side impact module terminal 1 X1 and terminal 2 X1.
4. Ignition ON, verify that the scan tool Passenger Side Airbag Squib Circuit Resistance parameter is less than 1.2 ohms at the control circuits.

⇒	If greater than the specified range, test the control circuits for a short to voltage or an open/high resistance. If the circuits test normal, replace the SDM.

5. If all circuits test normal, replace the passenger inflatable restraint side impact module.

Repair Instructions

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.