B0066
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/Driver Pretensioner Deployment Loop Resistance Low
DTC B0065
- Left Front/Driver Pretensioner Deployment Loop Open
DTC B0066
- Left Front/Driver Pretensioner Deployment Loop Voltage Out of Range
Diagnostic Fault Information
Circuit/System Description
The driver seat belt pretensioner deployment loop consists of a seat belt pretensioner - LF and the seat belt pretensioner - LF high and low circuits. A shorting bar used within the seat belt pretensioner connector shorts together both the seat belt pretensioner high and low circuits when the connector is disconnected. This will help to prevent unwanted deployment of the pretensioner during servicing. During a 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. The SDM performs continuous diagnostic tests on the deployment loops to check for proper circuit continuity and for shorts to ground or voltage. If a malfunction is detected, a diagnostic trouble code (DTC) will be stored in memory.
Conditions for Running the DTC
Ignition voltage is between 9-16 volts.
Conditions for Setting the DTC
B0064
DTC B0064 will set when the seat belt pretensioner - LF deployment loop resistance is less than 1.3 ohms for 500 milliseconds.
B0065
DTC B0065 will set when one of the following conditions occurs:
* Seat belt pretensioner - LF high circuit is less than 2.4 volts and the seat belt pretensioner - LF deployment loop is greater than 6 ohms for 500 milliseconds.
* Seat belt pretensioner - LF deployment loop resistance is greater than 4.8 ohms for 500 milliseconds.
B0066
DTC B0066 when one of the following conditions occur:
* Seat belt pretensioner - LF high 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.
* The SIR system is disabled and no deployments are allowed.
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.
Diagnostic Aids
If there is more than one DTC set diagnose the open DTC first. The following are possible causes of the malfunction:
* A short between the seat belt pretensioner - LF high and low circuits
* An open or a high resistance in the seat belt pretensioner - LF high or low circuits
* A short to ground or a short to voltage in the seat belt pretensioner - LF high or low circuits
* The seat belt pretensioner - LF connector
* The SDM connector
* A malfunctioning seat belt pretensioner
* A malfunctioning SDM
Reference Information
Schematic Reference
SIR Schematics ([1][2]Air Bag Systems)
Connector End View Reference
Component Connector End Views (Connector Views)
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 SIR Driver/Passenger Load Tool
* J 38715-50 Load Tool Adapter
Circuit/System Testing
1. With the ignition OFF, disconnect seat belt pretensioner connector.
2. Inspect the component and wiring harness sides of connector for the seat belt pretensioner for damage or corrosion.
• If the connector for the seat belt pretensioner is damaged, the seat belt pretensioner must be replaced.
• If the seat belt pretensioner wiring harness side connector is damaged, replace the connector.
3. Use J 38715-50 adapter to connect the J 38715-A SIR Driver/Passenger Load Tool to the harness side of the seat belt pretensioner wiring harness connector. Use the PASSENGER INFLATOR connector located on the load tool.
4. With the ignition ON, use a scan tool to observe the SIR DTC display. Verify DTC B0064, B0065, or B0066 are set in history.
• If DTC B0064, B0065, or B0066 is history replace the seat belt pretensioner.
5. With the ignition OFF, disconnect and remove the J 38715-A and adapter.
6. Remove the inflatable restraint sensing and diagnostic module (SDM) connector. Inspect the SDM connector for damage or corrosion that may cause a malfunction in the seat belt pretensioner high and/or low circuits.
• If damage or corrosion is found make the appropriate repair.
7. Test the high and low circuits between the SDM and seat belt pretensioner for a short to voltage, short to ground, or open/low resistance.
• If circuits test good then replace the SDM.
Repair Instructions
Perform the Diagnostic Repair Verification (Verification Tests) after completing the diagnostic procedure.
* Seat Belt Retractor Pretensioner Replacement - Front (Extended Cab) (Seat Belt Retractor Pretensioner Replacement - Front (Extended Cab))Seat Belt Retractor Pretensioner Replacement - Front (Regular Cab) (Seat Belt Retractor Pretensioner Replacement - Front (Regular Cab))Seat Belt Retractor Pretensioner Replacement - Front (Crew Cab) (Seat Belt Retractor Pretensioner Replacement - Front (Crew Cab))
* SIR/SRS Wiring Repairs (Component Tests and General Diagnostics)
* Control Module References (Programming and Relearning)for SDM replacement, setup, and programming