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B001A





DTC B001A or B001B

Diagnostic Instructions

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

DTC Descriptors

DTC B001A 01: Driver Seat Belt Anchor Pretensioner Deployment Loop Short to Battery
DTC B001A 02: Driver Seat Belt Anchor Pretensioner Deployment Loop Short to Ground
DTC B001A 04: Driver Seat Belt Anchor Pretensioner Deployment Loop Open Circuit
DTC B001A 0D: Driver Seat Belt Anchor Pretensioner Deployment Loop Resistance Above Threshold
DTC B001A 0E: Driver Seat Belt Anchor Pretensioner Deployment Loop Resistance Below Threshold
DTC B001B 01: Passenger Seat Belt Anchor Pretensioner Deployment Loop Short to Battery
DTC B001B 02: Passenger Seat Belt Anchor Pretensioner Deployment Loop Short to Ground
DTC B001B 04: Passenger Seat Belt Anchor Pretensioner Deployment Loop Open Circuit
DTC B001B 0D: Passenger Seat Belt Anchor Pretensioner Deployment Loop Resistance Above Threshold
DTC B001B 0E: Passenger Seat Belt Anchor Pretensioner Deployment Loop Resistance Below Threshold

Diagnostic Fault Information






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 driver or passenger seat belt anchor pretensioner. 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 driver or passenger seat belt anchor pretensioner connector which will short together both seat belt anchor pretensioner high and low circuits when the connector is disconnected, this will help to prevent unwanted deployment of the air bag during servicing.

Conditions for Running the DTC

Ignition voltage is between 9-16 V.

Conditions for Setting the DTC

B001A 01, B001B 01
The anchor pretensioner high and/or low circuit is short to voltage for 120 milliseconds.

B001A 02, B001B 02
The anchor pretensioner high and/or low circuit is short to ground for 120 milliseconds.

B001A 04, B001B 04
The anchor pretensioner high and/or low circuit is open for 120 milliseconds.

B001A 0D, B001B 0D
The anchor pretensioner deployment loop resistance is more than 3.9 ohms for 120 milliseconds.

B001A 0E, B001B 0E
The anchor pretensioner deployment loop resistance is less than 1.1 ohms for 120 milliseconds.

Action Taken When the DTC Sets

- The SDM requests the instrument panel cluster (IPC) to illuminate the AIR BAG indicator.
- The SDM will store a DTC, however if an event occurs the system will still attempt deployments.

Conditions for Clearing the DTC

- The condition for setting the DTC no longer exists.
- A history DTC will clear once 100 malfunction-free ignition cycles have occurred.

Reference Information

Schematic Reference

SIR Schematics Electrical Diagrams

Connector End View Reference

Component Connector End Views Connector Views

Description and Operation

SIR System Description and Operation Description and Operation

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

Scan Tool Reference

Control Module References for scan tool information Control Module References

Special Tools

Each inflatable restraint module requires a specific adapter to connect the load tool to the SIR system.

J 38715-A Driver and Passenger SIR Load Tool

Circuit/System Testing

Note: Refer to SIR Service Precautions Technician Safety Information.

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

- Seat belt anchor pretensioner
- SDM
- Seat belt anchor pretensioner wiring harness connector
- SDM wiring harness connector

Note: 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. Verify that the seat belt anchor pretensioner connector and CPA are engaged.

-> If the above condition is not found, make the appropriate repair.

2. Ignition OFF, disconnect the harness connector at the seat belt anchor pretensioner.
3. Connect the load tool adaptor J 38715-A Driver and Passenger SIR Load Tool in place of the seat belt anchor pretensioner.
4. Ignition ON, with a scan tool, verify that DTC B001A is set as current.

-> If the DTC is not set or is set as history, cycle the ignition OFF, disconnect the load tool and adapter, reconnect the harness connector at the seat belt anchor pretensioner, and cycle the ignition ON. If the DTC resets after reconnecting the seat belt anchor pretensioner, replace the seat belt anchor pretensioner.

5. Ignition OFF, disconnect the load tool and the adapter.
6. Disconnect the harness connector at the SDM.
7. Ignition ON, test for less than 1.0 V between the low control circuit terminal 24 (Driver) or terminal 27 (Passenger) and ground.

-> If greater than the specified range, test the control circuit for a short to voltage.

8. Ignition ON, test for less than 1.0 V between the high control circuit terminal 25 (Driver) or terminal 26 (Passenger) and ground.

-> If greater than the specified range, test the control circuit for a short to voltage.

9. Ignition OFF, test for infinite resistance between the low control circuit terminal 24 (Driver) or terminal 27 (Passenger) and ground.

-> If less than the specified value, test the control circuit for a short to ground.

10. Ignition OFF, test for infinite resistance between the high control circuit terminal 25 (Driver) or terminal 26 (Passenger) and ground.

-> If less than the specified value, test the control circuit for a short to ground.

11. Test for less than 1.0 ohms between the low control circuit terminal 2 and the SDM terminal 24 (Driver) or terminal 2 and the SDM terminal 27 (Passenger).

-> If greater than the specified range, test the control circuit for an open/high resistance.

12. Test for less than 1.0 ohms between the high control circuit terminal 1 and the SDM terminal 25 (Driver) or terminal 1 and the SDM terminal 26 (Passenger).

-> If greater than the specified range, test the control circuit for an open/high resistance.

13. If all circuits test normal, replace the SDM.

Repair Instructions

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

- Front Seat Belt Anchor Plate Tensioner Replacement Removal and Replacement
- SIR/SRS Wiring Repairs [1][2]Air Bag Systems
- Control Module References for SDM replacement, setup, and programming Control Module References
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