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B001B



DTC B001B

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 provide an overview of each diagnostic category.

DTC Descriptors

- DTC B001B 01 : Right Front Seat Belt Pretensioner Deployment Loop Short to Battery.
- DTC B001B 02 : Right Front Seat Belt Pretensioner Deployment Loop Short to Ground.
- DTC B001B 04 : Right Front Seat Belt Pretensioner Deployment Loop Open Circuit.
- DTC B001B 0D : Right Front Seat Belt Pretensioner Deployment Loop Resistance Above Threshold.
- DTC B001B 0E : Right Front Seat Belt Pretensioner Deployment Loop Resistance Below Threshold.

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 - RF. 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 - RF connector which will short together both seat belt pretensioner - RF 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

B001B 01
- The seat belt pretensioner - RF high and/or low circuit is short to voltage for 120 milliseconds.
B001B 02
- The seat belt pretensioner - RF high and/or low circuit is short to ground for 120 milliseconds.
B001B 04
- The seat belt pretensioner - RF high and/or low circuit is open for 120 milliseconds.
B001B 0D
- The seat belt pretensioner - RF deployment loop resistance is more than 3.9 ohms for 120 milliseconds.
B001B 0E
- The seat belt pretensioner - RF deployment loop resistance is less than 1.1 ohms for 120 milliseconds.

Action Taken When the DTC Sets

- The SDM requests the instrument panel cluster (IPC) to illuminate the AIR BAG indicator.
- The SDM will store a DTC, however if an event occurs the system will still attempt deployments.

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.

Circuit/System Testing

Important: When performing service on or near the SIR components or the SIR wiring, the SIR system must be disabled. Refer to SIR Disabling and Enabling . Failure to observe the correct procedure could cause deployment of the SIR components, personal injury, or unnecessary SIR system repairs.

The inflatable restraint sensing and diagnostic module (SDM) maintains a reserved energy supply. The reserved energy supply provides deployment power for the air bags. Deployment power is available for as much as 1 minute after disconnecting the vehicle power. Disabling the SIR system prevents deployment of the air bags from the reserved energy supply. Refer to SIR Disabling and Enabling.

The following are general service instructions which must be followed in order to properly repair the vehicle and return it to its original integrity:
- Do not expose inflator modules to temperatures above 65°C (150°F).
- Verify the correct replacement part number. Do not substitute a component from a different vehicle.
- Use only original GM replacement parts available from your authorized GM dealer. Do not use salvaged parts for repairs to the SIR system.

Discard any of the following components if it has been dropped from a height of 91 cm (3 ft) or greater.

- Inflatable restraint sensing and diagnostic module (SDM).
- Inflatable restraint I/P module.
- Inflatable restraint steering wheel module.
- Inflatable restraint steering wheel module coil.
- Inflatable restraint roof side rail modules.
- Inflatable restraint side impact sensors (SIS).
- Inflatable restraint seat belt retractor pretensioners.
- Inflatable restraint front end sensors.

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.

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 RF 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 RF inflatable restraint seat belt pretensioner.
3. Connect the load tool adaptor SA9409Z-A in place of the LF inflatable restraint seat belt pretensioner.
4. Ignition ON, with a scan tool, verify that DTC B001B 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 RF inflatable restraint seat belt pretensioner, and cycle the ignition ON. If the DTC resets after reconnecting the pretensioner, replace the RF 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 27 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 26 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 27 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 26 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 1 and the SDM terminal 27.
->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 2 and the SDM terminal 26.
->If not within the specified range, test the control circuit for an open/high resistance.
13. If all circuits test normal, replace the SDM.
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