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 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 shorted to ground or shorted 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 requests the instrument panel cluster (IPC) to illuminate the AIR BAG indicator.
* 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: 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:
* Inflatable restraint seat belt pretensioner
* SDM module
* Front end sensor 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. Verify that the LF inflatable restraint seat belt 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 LF inflatable restraint seat belt pretensioner.
3. With the appropriate load tool adapter, connect J 38715-A in place of the LF inflatable restraint seat belt pretensioner.
4. Ignition ON, with a scan tool, verify that the appropriate DTC 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 LF inflatable restraint seat belt pretensioner, and cycle the ignition ON. If the DTC resets after reconnecting the pretensioner, replace the LF inflatable restraint seat belt 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 volt between the low control circuit terminal B 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 volt between the high control circuit terminal A 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 B 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 A and ground.
• If less than the specified value, test the control circuit for a short to ground.
11. Test for less than 1.0 ohm between the low control circuit terminal B and the SDM terminal A6.
• If greater than the specified range, test the control circuit for an open/high resistance.
12. Test for less than 1.0 ohm between the high control circuit terminal A and the SDM terminal A5.
• 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 (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