Diagnostic Instructions

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	Short to Ground	High Resistance	Open	Short to Voltage	Signal Performance
Seat Belt Pretensioner - LF High Control	B0066	B0066	B0065	B0066	B0064
Seat Belt Pretensioner - LF Low Control	B0066	B0066	B0065	B0066	B0064

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:

B0066

DTC B0066 will set when one of the following conditions occur:

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

Description and Operation

SIR System Description and Operation

Electrical Information Reference

Scan Tool Reference

Control Module References for scan tool information

Special Tools

Circuit/System Testing

Important: Refer to SIR Service Precautions .

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 37 and ground.

⇒	If not within 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 38 and ground.

⇒	If not within 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 37 and ground.

⇒	If not within the specified range, test the control circuit for a short to ground.

10. Ignition OFF, test for infinite resistance between the high control circuit terminal 38 and ground.

⇒	If not within the specified range, 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 37.

⇒	If not within 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 38.

⇒	If not within 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.