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B001B





DTC B001A or B001B

Diagnostic Instructions

* Perform the Diagnostic System Check - Vehicle Diagnostic System Check - Vehicle prior to using this diagnostic procedure.

* Review Strategy Based Diagnosis Strategy Based Diagnosis for an overview of the diagnostic approach.

* Diagnostic Procedure Instructions Diagnostic Procedure Instructions provide an overview of each diagnostic category.

DTC Descriptors

DTC B001A 01
- Driver Seat Belt Anchor Pretensioner Deployment Loop Short to Battery

DTC B001A 02
- Driver Seat Belt Anchor Pretensioner Deployment Loop Short to Ground

DTC B001A 04
- Driver Seat Belt Anchor Pretensioner Deployment Loop Open

DTC B001A 0D
- Driver Seat Belt Anchor Pretensioner Deployment Loop High Resistance

DTC B001A 0E
- Driver Seat Belt Anchor Pretensioner Deployment Loop Low Resistance

DTC B001B 01
- Passenger Seat Belt Anchor Pretensioner Deployment Loop Short to Battery

DTC B001B 02
- Passenger Seat Belt Anchor Pretensioner Deployment Loop Short to Ground

DTC B001B 04
- Passenger Seat Belt Anchor Pretensioner Deployment Loop Open

DTC B001B 0D
- Passenger Seat Belt Anchor Pretensioner Deployment Loop High Resistance

DTC B001B 0E
- Passenger Seat Belt Anchor Pretensioner Deployment Loop Low Resistance

Diagnostic Fault Information






Circuit/System Description

During a side or frontal crash of sufficient force the inflatable restraint sensing and diagnostic module will allow current to flow through the deployment loop in order to deploy the appropriate seat belt anchor pretensioner. The inflatable restraint sensing and diagnostic module 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 anchor pretensioner connector will short together both seat belt anchor pretensioner high and low control circuits when the connector is disconnected, this will help to prevent unwanted deployment of the pretensioner during servicing.

Conditions for Running the DTC

Ignition voltage is between 9-16 V.

Conditions for Setting the DTC

B001A 01, B001B 01

The seat belt anchor pretensioner control circuit is shorted to voltage for 120 milliseconds.

B001A 02, B001B 02

The seat belt anchor pretensioner control circuit is shorted to ground for 120 milliseconds.

B001A 04, B001B 04

The seat belt anchor pretensioner control circuit is open for 120 milliseconds.

B001A 0D, B001B 0D

The seat belt anchor pretensioner deployment loop resistance is more than 4.2 ohms for 120 milliseconds.

B001A 0E, B001B 0E

The seat belt anchor pretensioner deployment loop resistance is less than 1.7 ohms for 120 milliseconds.

Action Taken When the DTC Sets

* The inflatable restraint sensing and diagnostic module requests the instrument cluster to illuminate the AIR BAG indicator.

* The inflatable restraint sensing and diagnostic module 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.

Diagnostic Aid

Note: The following diagnostic aids apply for both current and history DTCs.

An incorrectly installed CPA or incorrectly seated connector can cause a shorting bar to short both control circuits together. Check the connectors and CPAs if a DTC with symptom byte 02 or 0E is set, to ensure that the shorting bars are not causing the circuits to be shorted together. Shorting bars locations are listed below:

* Inline connectors - on the seat belt anchor pretensioner side of the harness connector

* Harness side of the inflatable restraint sensing and diagnostic module connector

Terminal fretting, an incorrectly installed CPA, or incorrectly seated connector can cause an open/high resistance condition. Check the circuit terminals for fretting, incorrectly installed CPAs, or incorrectly seated connectors if a DTC with symptom byte 04 or 0D is set.

If the seat belt anchor pretensioner has deployed under unexpected conditions and/or DTC with symptom byte 01 is set, check both control circuits for a short to voltage.

Reference Information

Schematic Reference

SIR Schematics [1][2]Air Bag Systems

Connector End View Reference

Component Connector End Views A/C Compressor Clutch

Description and Operation

SIR System Description and Operation SIR System

Electrical Information Reference

* Circuit Testing Circuit Testing

* Connector Repairs Connector Repairs

* Testing for Intermittent Conditions and Poor Connections Testing for Intermittent Conditions and Poor Connections

* Wiring Repairs Wiring Repairs

Scan Tool Reference

Control Module References Control Module References for scan tool information

Special Tools

EL-38125-580 - Terminal Release Tool Kit

Circuit/System Verification

Note:

* Refer to SIR Service Precautions Service Precautions

* Inspect all terminals for damage or corrosion when disconnecting connectors. Damage or corrosion in the following requires repair or replacement of the affected component/connector.

- Seat belt anchor pretensioner

- Inflatable restraint sensing and diagnostic module

- Seat belt anchor pretensioner wiring harness connector

- Inflatable restraint sensing and diagnostic module 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 shorting-bars within the connector allowing the deployment circuit to operate properly. Replace any CPA that is damaged or missing.

* If the condition is intermittent or cannot be duplicated, disconnect the connectors and add dielectric grease / lubricant (Nyogel 760G or equivalent, meeting GM specification 9986087). This procedure will correct the high resistance condition due to terminal fretting corrosion.

1. Verify the scan tool Deployment Loop Resistance 1 and 2 parameters stay consistently between 2.1 and 4.0 ohms without any spikes or dropouts while moving the harness near each connector listed below:

* F113 Seat belt anchor pretensioner

* Any inline harness

* K36 inflatable restraint sensing and diagnostic module

• If less than 2.1 or greater than 4.0 ohms
Refer to Circuit/System Testing.

• If there are spikes or dropouts, perform the following

* Inspect each connector terminal and harness for damage or corrosion and repair as necessary

* Apply dielectric grease / lubricant (Nyogel 760G or equivalent, meeting GM specification 9986087) to each connector terminal

* Insure each connector and CPA is correctly seated.

• If within 2.1 and 4.0 ohms without any spikes or dropouts

2. All OK

Circuit/System Testing

Note:

* Refer to SIR Service Precautions Service Precautions.

* Inspect all terminals for damage or corrosion when disconnecting connectors. Damage or corrosion in the following requires repair or replacement of the affected component/connector.

- Seat belt anchor pretensioner

- Inflatable restraint sensing and diagnostic module

- Seat belt anchor pretensioner wiring harness connector

- Inflatable restraint sensing and diagnostic module 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 shorting-bars within the connector allowing the deployment circuit to operate properly. Replace any CPA that is damaged or missing.

* If the condition is intermittent or cannot be duplicated, disconnect the connectors and add dielectric grease / lubricant (Nyogel 760G or equivalent, meeting GM specification 9986087). This procedure will correct the high resistance condition due to terminal fretting corrosion.

1. Ignition OFF, disconnect the scan tool and then disconnect the harness connector at the appropriate F113 seat belt anchor pretensioner and then wait 120 seconds.

2. Test for greater than 25 ohms between the control circuit terminals listed below:

* F113 Driver seat belt anchor pretensioner terminal 1 and 2

* F113 Passenger seat belt anchor pretensioner terminal 1 and 2

• If 25 ohms or less

1. Disconnect the harness connector at the K36 inflatable restraint sensing and diagnostic module.

Note: Some connectors may be equipped with shorting bars as a safety component to prevent accidental inflator deployment. When testing on a connector with shorting bars, the shorting bars must be disabled to ensure accurate test results. Insert an appropriate pick from EL-38125-580 and depress the shorting bars above the appropriate terminals. This will lift the shorting bar from the terminal and allow accurate test results. Take care not to damage the connector, shorting bar, or terminal when depressing the shorting bar.

2. Test for infinite resistance between the two control circuits.

• If less than infinite resistance, repair the short between the two circuits.

• If infinite resistance, replace the K36 inflatable restraint sensing and diagnostic module.

• If greater than 25 ohms

3. Ignition ON.

4. Test for less than 11 V between the control circuit terminals listed below and ground:

* F113 seat belt anchor pretensioner control circuit terminal 1

* F113 seat belt anchor pretensioner control circuit terminal 2

• If 11 V or greater

1. Ignition OFF, disconnect the harness connector at the K36 inflatable restraint sensing and diagnostic module, ignition ON.

2. Test for less than 1 V between the control circuit and ground.

• If 1 V or greater, repair the short to voltage on the circuit.

• If less than 1 V, replace the K36 inflatable restraint sensing and diagnostic module.

• If less than 11 V

5. Ignition OFF.

6. Test for greater than 25 ohms between the control circuit terminals listed below and ground:

* F113 seat belt anchor pretensioner control circuit terminal 1

* F113 seat belt anchor pretensioner control circuit terminal 2

• If 25 ohms or less

1. Disconnect the harness connector at the K36 inflatable restraint sensing and diagnostic module.

2. Test for infinite resistance between the control circuit and ground.

• If less than infinite resistance, repair the short to ground on the circuit.

• If infinite resistance, replace the K36 inflatable restraint sensing and diagnostic module.

• If greater than 25 ohms

7. Ignition OFF, install a 3 A fused jumper wire between the control circuit terminals listed below, ignition ON:

* F113 Driver seat belt anchor pretensioner terminal 1 and 2

* F113 Passenger seat belt anchor pretensioner terminal 1 and 2

8. Verify the scan tool Deployment Loop Resistance parameter is less than 2 ohms.

• If 2 ohms or greater

1. Ignition OFF, disconnect the harness connector at the K36 inflatable restraint sensing and diagnostic module.

2. Test for less than 2 ohms in each control circuit end to end.

• If 2 ohms or greater, repair the open/high resistance in the circuit.

• If less than 2 ohms, replace the K36 inflatable restraint sensing and diagnostic module.

• If less than 2 ohms

9. Ignition OFF, connect the harness connector at the F113 seat belt anchor pretensioner, press in the CPA (if equipped) until an audible and/or tactile click is heard.

10. Ignition ON, clear DTCs. Operate the vehicle within the Conditions for Running the DTC.

11. Verify DTC B001A or B001B is not set.

• If DTC B001A or B001B is set
Replace the F113 seat belt anchor pretensioner.

• If DTC B001A or B001B is not set

12. All OK.

Repair Instructions

Perform the Diagnostic Repair Verification Verification Tests after completing the repair.

* Front Seat Belt Anchor Plate Tensioner Replacement (AQ9) Front Seat Belt Anchor Plate Tensioner Replacement (AQ9)Front Seat Belt Anchor Plate Tensioner Replacement (W2E) Front Seat Belt Anchor Plate Tensioner Replacement (W2E)

* SIR/SRS Wiring Repairs SIR/SRS Wiring Repairs

* Control Module References Control Module References for inflatable restraint sensing and diagnostic module replacement, programming and setup

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