Diagnostic Instructions
| • | Perform the Diagnostic System Check - Vehicle prior to using the 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 B001A 01: Left Front Seat Belt Pretensioner Deployment Loop 2 Short to BatteryDTC B001A 02: Left Front Seat Belt Pretensioner Deployment Loop 2 Short to Ground
DTC B001A 04: Left Front Seat Belt Pretensioner Deployment Loop 2 Open Circuit
DTC B001A 0D: Left Front Seat Belt Pretensioner Deployment Loop 2 Resistance Above Threshold
DTC B001A 0E: Left Front Seat Belt Pretensioner Deployment Loop 2 Resistance Below Threshold
Diagnostic Fault Information
Circuit | Short to Ground | High Resistance | Open | Short to Voltage | Signal Performance |
|---|---|---|---|---|---|
Seat Belt Pretensioner - LF High | B001A 02 | B001A 0D | B001A 04 | B001A 01 | B001A 0E |
Seat Belt Pretensioner - LF Low | B001A 02 | B001A 0D | B001A 04 | B001A 01 | B001A 0E |
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 is 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
B001A 01
The seat belt pretensioner - LF high and/or low circuit is short to voltage.
B001A 02
The seat belt pretensioner - LF high and/or low circuit is short to ground.
B001A 04
The seat belt pretensioner - LF high and/or low circuit is open.
B001A 0D
The seat belt pretensioner - LF deployment loop resistance is more than 3.54 ohms.
B001A 0E
The seat belt pretensioner - LF deployment loop resistance is less than 1.77 ohms.
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. |
Reference Information
Schematic Reference
Connector End View Reference
Electrical Information Reference
Circuit/System Testing
- Ignition OFF, disconnect the seat belt pretensioner - LF in-line connector.
- Disconnect the SDM connector. Refer to SDM replacement in Repair Instructions for connector location.
- Test the high and low circuits between the SDM and seat belt pretensioner - LF for a short to voltage, short to ground, short between circuits or open/high resistance. Verify that a short to voltage, short to ground, short between circuits or open/high resistance does not exist.
- If all circuits test normal then replace the SDM.
- Ignition ON, use a scan tool to observe the SIR DTC display. Verify DTC B001A is set current.
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 I/P module • The SDM module • The I/P wiring harness connector • The SDM wiring harness connector
| ⇒ | If any of the above conditions are found make the appropriate repair. |
| ⇒ | Replace the seat belt pretensioner - LF. |
Repair Instructions
Perform the Diagnostic Repair Verification after completing the diagnostic procedure.
| • | Control Module References for SDM replacement, setup, and programming |
