Buick Regal: DTC B0098

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 B0098 01

Passenger Air Bag Disable Switch Short to Battery

DTC B0098 02

Passenger Air Bag Disable Switch Short to Ground

DTC B0098 04

Passenger Air Bag Disable Switch Open

DTC B0098 05

Passenger Air Bag Disable Switch High Voltage/Open

Diagnostic Fault Information

Circuit/System Description

When the ignition switch is turned to ON, the inflatable restraint and sensing and diagnostic module (SDM) will perform turn-on test to diagnose critical malfunctions within SDM itself. The SDM continuously checks the disable switch position switch and circuit defect by letting the regular voltage flow through the disable switch circuit and verifying the current.

Conditions for Running the DTC

Ignition voltage is between 9 - 16 V.

Conditions for Setting the DTC

B0098 01

The inflatable restraint and sensing and diagnostic module detects a short to voltage in the passenger air bag disable switch signal circuit.

B0098 02

The inflatable restraint and sensing and diagnostic module detects a short to ground in the passenger air bag disable switch signal circuit.

B0098 04

The inflatable restraint and sensing and diagnostic module detects an open/high resistance in the passenger air bag disable switch, the signal circuit or the low reference circuit.

B0098 05

The inflatable restraint and sensing and diagnostic module detects a short to voltage or an open/high resistance in the passenger air bag disable switch signal circuit or the passenger air bag disable switch ground circuit.

Action Taken When the DTC Sets

The inflatable restraint and sensing and diagnostic module will ignore the signal from the passenger air bag disable switch and will continuously enable the passenger air bag.

Conditions for Clearing the DTC

• The DTC will be current for as long as the fault is present.
• When the fault is no longer present, the DTC will be a history DTC.
• A history DTC will clear after 50 ignition cycles.

Reference Information

Schematic Reference

SIR Wiring Schematics

Connector End View Reference

Component Connector End View Index

Description and Operation

Supplemental Inflatable Restraint System Description and Operation

Electrical Information Reference

• Circuit Testing
• Testing for Intermittent Conditions and Poor Connections
• Wiring Repairs
• Connector Repairs

Scan Tool Reference

Refer to Control Module References for scan tool information.

Circuit/System Verification

1. Verify that DTC B0098 symptom byte 01, 02, 04, or 05 is not set as current.

• If DTC B0098 symptom byte 01, 02, 04, or 05 is set as current

Refer to Circuit/System Testing.

• Go to next step: If DTC B0098 symptom byte 01, 02, 04, or 05 is not set as current

2. Observe the scan tool Passenger Air Bag Disabled Switch parameter while commanding the passenger air bag ON and OFF by using the S40 passenger air bag disable switch. The value should change between On and Off

• If the value does not change

Refer to Circuit/System Testing.

• Go to next step: If the value changes

3. All OK.

Circuit/System Testing

1. Ignition OFF.

2. Disconnect the harness connector at the S40 passenger air bag disable switch.

3. Test for less than 30 Ω between the low reference circuit terminal 3 and ground.

• If 30 Ω or greater

1. Ignition OFF, disconnect the X1 harness connector at the K36 inflatable restraint and sensing and diagnostic module.
2. Test for less than 2 Ω in the S40 passenger air bag disable switch ground circuit end to end.
   • If 2 Ω or greater, replace the coil or repair the open/high resistance in the circuit.
   • If less than 2 Ω, replace the K36 inflatable restraint and sensing and diagnostic module.

• Go to next step: If less than 30 Ω

4. Ignition ON, test for 1 - 3 V between the signal circuit terminal 1 and ground.

• If less than 1 V

1. Disconnect the X1 harness connector at the K36 inflatable restraint and sensing and diagnostic module.
2. Test for infinite resistance between the signal circuit and ground.
   • If less than infinite resistance, repair the short to ground on the circuit.
3. Test for less than 2 Ω in the signal circuit end to end.
   • If 2 Ω or greater, repair the open/high resistance in the circuit.
   • If less than 2 Ω, replace the K36 inflatable restraint and sensing and diagnostic module.

• If greater than 3 V

1. Ignition OFF.
2. Disconnect the X1 harness connector at the K36 inflatable restraint and sensing and diagnostic module.
3. Ignition ON.
4. Test for less than 1 V between the signal 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 and sensing and diagnostic module.

• Go to next step: If between 1 - 3 V

5. Test or replace the S40 passenger air bag disable switch.

Component Testing

1. Disconnect the harness connector at the S40 passenger air bag disable switch.

2. With the switch in the AIR BAG ON position, test for 380 - 420 Ω between the signal terminal 1 and the ground terminal 3.

• If not between 380 - 420 Ω

Replace the S40 passenger air bag disable switch.

• Go to next step: If between 380 - 420 Ω

3. With the switch in the AIR BAG OFF position, test for 95 - 105 Ω, between the signal terminal 1 and the ground terminal 3.

• If not between 95 - 105 Ω

Replace the S40 passenger air bag disable switch.

• Go to next step: If between 95 - 105 Ω

4. All OK.

Repair Instructions

Perform the Diagnostic Repair Verification after completing the repair.

• Refer to Instrument Panel Airbag Disable Switch Replacement
• Refer to Control Module References for inflatable restraint and sensing and diagnostic module control module replacement, programming and setup

DTC B009E

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 Descriptor

DTC B009E

Safing Sensor

For symptom byte information, refer to Symptom Byte List.

Circuit/System Description

The internal fault detection is handled inside the device. The symptom byte information is for engineering reference only. No external circuit diagnosis is involved.

Conditions for Running the DTC

The device runs the program to detect an internal fault when power up is commanded. The only requirements are voltage and ground. This program runs even if the voltage is out of the valid operating range.

Conditions for Setting the DTC

The device has detected an internal malfunction.

Action Taken When the DTC Sets

The device refuses all additional inputs.

Conditions for Clearing the DTC

• A current DTC clears when the malfunction is no longer present.
• A history DTC clears when the device ignition cycle counter reaches the reset threshold of 50, without a repeat of the malfunction.

Reference Information

Schematic Reference

SIR Wiring Schematics

Connector End View Reference

Component Connector End View Index

Description and Operation

Supplemental Inflatable Restraint System Description and Operation

Electrical Information Reference

• Circuit Testing
• Testing for Intermittent Conditions and Poor Connections
• Wiring Repairs
• Connector Repairs

Scan Tool Reference

Refer to Control Module References for scan tool information.

Circuit/System Verification

1. Ignition ON.

2. Verify DTC B009E is not set.

• If DTC B009E is set

Replace the device that set the DTC.

• Go to next step: If DTC B009E is not set

3. All OK

Repair Instructions

Perform the Diagnostic Repair Verification after completing the repair.

Refer to Control Module References for control module replacement, programming and setup.

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