B0064

DTC B0064, B0065, or B0066

Diagnostic Instructions

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



DTC Descriptors
DTC B0064
- Left Front Pretensioner Deployment Loop Resistance Low

DTC B0065
- Left Front Pretensioner Deployment Loop Open

DTC B0066
- Left Front Pretensioner Deployment Loop Voltage Out of Range




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 seat belt pretensioner - LF. 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 seat belt pretensioner - LF connector which will short together both seat belt pretensioner - LF 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

B0064

The seat belt pretensioner - LF deployment loop resistance is less than 1.3 ohms for 500 milliseconds.


B0065
* Seat belt pretensioner - LF high circuit is less than 2.4 volts and the seat belt pretensioner - LF deployment loop is more than 6 ohms for 500 milliseconds.
* Seat belt pretensioner - LF deployment loop resistance is more than 4.8 ohms for 500 milliseconds.



B0066
* Seat belt pretensioner - LF high and/or low circuits is short to ground or short to voltage for 500 milliseconds.
* Seat belt pretensioner - LF high circuit is less than 2.4 volts and seat belt pretensioner - LF deployment loop resistance is less than 6 ohms for 500 milliseconds.



Action Taken When the DTC Sets

* The SDM commands the AIR BAG indicator ON via serial data communications.
* The SIR system is disabled and no deployments are allowed.



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.



Diagnostic Aids

If there is more than one DTC set diagnose the open DTC first.


Reference Information
Schematic Reference

SIR Schematics ([1][2]Air Bag Systems)
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 (Component Tests and General Diagnostics)
* Connector Repairs (Component Tests and General Diagnostics)
* Testing for Intermittent Conditions and Poor Connections (Component Tests and General Diagnostics)
* Wiring Repairs (Component Tests and General Diagnostics)

Scan Tool Reference

Control Module References (Programming and Relearning) for Scan Tool Information
Special Tools

J 38715-A Driver and Passenger Sir Load Tool


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 seat belt retractor pretensioner - LF

* The SDM module

* The seat belt retractor pretensioner - LF wiring harness connector

* The SDM wiring harness connector



1. Ignition OFF, disconnect the seat belt pretensioner - LF wiring harness connector located under the driver front seat.
2. Use the J 38715-A to connect the harness side of the seat belt pretensioner - LF 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 B0064, B0065, or B0066 is set current.

• If DTC B0064, B0065, or B0066 is history replace the seat belt pretensioner - LF.

4. Ignition OFF, disconnect and remove the J 38715-A.
5. Disconnect the SDM harness connector.
6. Test the high and low circuits between the SDM and seat belt pretensioner - LF for a short to voltage, short to ground, or open/low resistance. Verify that a short to voltage, short to ground, or open/low resistance does not exist.

• If any of the above conditions are found make the appropriate repair.

7. If all circuits test normal then replace the SDM.



Repair Instructions

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

* Seat Belt Buckle Pretensioner Replacement (Removal and Replacement)
* SIR/SRS Wiring Repairs (Component Tests and General Diagnostics)
* Control Module References (Programming and Relearning) for SDM replacement, setup, and programming