For 1990-2009 cars

### 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 : Passenger Seat Belt Pretensioner Deployment Loop Short to Battery
DTC B001B 02 : Passenger Seat Belt Pretensioner Deployment Loop Short to Ground
DTC B001B 04 : Passenger Seat Belt Pretensioner Deployment Loop Open Circuit
DTC B001B 0D : Passenger Seat Belt Pretensioner Deployment Loop Resistance Above Threshold
DTC B001B 0E : Passenger Seat Belt Pretensioner Deployment Loop Resistance Below Threshold

### Diagnostic Fault Information

Circuit | Short to Ground | High Resistance | Open | Short to Voltage | Signal Performance
--- | --- | --- | --- | --- | ---
Driver Seat Belt Pretensioner - Low Control | B001A 02, B001A 0E | B001A 0D | B001A 04 | B001A 01 | --
Driver Seat Belt Pretensioner - High Control | B001A 02, B001A 0E | B001A 0D | B001A 04 | B001A 01 | --
Passenger Seat Belt Pretensioner - Low Control | B001B 02, B001B 0E | B001B 0D | B001B 04 | B001B 01 | --
Passenger Seat Belt Pretensioner - High Control | B001B 02, B001B 0E | B001B 0D | B001B 04 | B001B 01 | --

### 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 passenger 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. A shorting bar used within the passenger seat belt pretensioner connector which will short together both passenger seat belt pretensioner 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 V.

### Conditions for Setting the DTC

#### B001B 01

The passenger seat belt pretensioner high and/or low circuit is short to voltage for 120 milliseconds.

#### B001B 02

The passenger seat belt pretensioner high and/or low circuit is short to ground for 120 milliseconds.

#### B001B 04

The passenger seat belt pretensioner high and/or low circuit is open for 120 milliseconds.

#### B001B 0D

The passenger seat belt pretensioner deployment loop resistance is more than 3.9 Ω for 120 milliseconds.

#### B001B 0E

The passenger seat belt pretensioner deployment loop resistance is less than 1.1 Ω for 120 milliseconds.

### Action Taken When the DTC Sets

• | The SDM requests the instrument panel cluster 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.

### 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

• | Circuit Testing

• | Connector Repairs

• | Testing for Intermittent Conditions and Poor Connections

• | Wiring Repairs

#### Scan Tool Reference

Control Module References for scan tool information

### Circuit/System Testing

Note: 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

Note: 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.

1. Ignition OFF, disconnect the harness connector at the F112P passenger inflatable restraint seat belt pretensioner.
2. Ignition ON, verify that the scan tool Deployment Loop Resistance parameter is infinite resistance at the control circuits.

⇒ | If less than the specified value, test the control circuits for a short to ground. If the circuits test normal, replace the K36 SDM.

3. Connect a fused jumper wire between F112P passenger seat belt pretensioner terminal 1 and terminal 2.
4. Ignition ON, verify that the scan tool Deployment Loop Resistance parameter is less than 1.8 Ω at the control circuits.

⇒ | If greater than the specified range, test the control circuits for a short to voltage or an open/high resistance. If the circuits test normal, replace the K36 SDM

5. If all circuits test normal, replace the F112P passenger seat belt pretensioner module.

### Repair Instructions

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

• | Driver or Passenger Seat Belt Tensioner Replacement

• | SIR/SRS Wiring Repairs

• | Control Module References for SDM replacement, setup, and programming