Diagnostic Instructions
| • | Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure. |
| • | Review Strategy Based Diagnosis for an overview of the diagnostic approach. |
| • | Diagnostic Procedure Instructions provides an overview of each diagnostic category. |
DTC Descriptors
DTC B0064: Left Front Pretensioner Deployment Loop Resistance LowDTC B0065: Left Front Pretensioner Deployment Loop Open
DTC B0066: Left Front Pretensioner Deployment Loop Voltage Out of Range
Diagnostic Fault Information
Circuit | Short to Ground | Open/High Resistance | Short to Voltage | Signal Performance |
|---|---|---|---|---|
Seat Belt Pretensioner - LF High | B0066 | B0066 | B0065 | B0064 |
Seat Belt Pretensioner - LF Low | B0066 | B0066 | B0065 | B0064 |
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 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 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 100 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
Connector End View Reference
Description and Operation
SIR System Description and Operation
Electrical Information Reference
Scan Tool Reference
Control Module References for scan tool information
Special Tools
J 38715-A Driver and Passenger SIR Load Tool
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.
- Verify that the LF inflatable restraint seat belt pretensioner connector and CPA are engaged.
- Ignition OFF, disconnect the harness connector at the LF inflatable restraint seat belt pretensioner.
- With the appropriate load tool adapter, connect J 38715-A in place of the LF inflatable restraint seat belt pretensioner.
- Ignition ON, with a scan tool, verify that the appropriate DTC is set as current.
- Ignition OFF, disconnect the load tool and the adapter.
- Disconnect the harness connector at the SDM.
- Ignition ON, test for less than 1.0 volt between the low control circuit terminal 2 and ground.
- Ignition ON, test for less than 1.0 volt between the high control circuit terminal 1 and ground.
- Ignition OFF, test for infinite resistance between the low control circuit terminal 2 and ground.
- Ignition OFF, test for infinite resistance between the high control circuit terminal 1 and ground.
- Test for less than 1.0 ohm between the low control circuit terminal 2 and the SDM terminal 16.
- Test for less than 1.0 ohm between the high control circuit terminal 1 and the SDM terminal 17.
- If all circuits test normal, replace the SDM.
| ⇒ | If the above condition is not found, make the appropriate repair. |
| ⇒ | 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. |
| ⇒ | If greater than the specified range, test the control circuit for a short to voltage. |
| ⇒ | If greater than the specified range, test the control circuit for a short to voltage. |
| ⇒ | If less than the specified value, test the control circuit for a short to ground. |
| ⇒ | If less than the specified value, test the control circuit for a short to ground. |
| ⇒ | If greater than the specified range, test the control circuit for an open/high resistance. |
| ⇒ | If greater than the specified range, test the control circuit for an open/high resistance. |
Repair Instructions
Perform the Diagnostic Repair Verification after completing the diagnostic procedure.
| • | Control Module References for SDM replacement, setup, and programming |
