Opel Insignia Owners & Service Manuals

Opel Insignia: Diagnostic Information and Procedures

Opel Insignia B 2018-2024 Service Manual / HVAC & Restraints / Seat Belts / Diagnostic Information and Procedures

DTC B0072 or B0073

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 B0072 01

Driver Seat Belt Switch Circuit Short to Battery

DTC B0072 02

Driver Seat Belt Switch Circuit Short to Ground

DTC B0072 04

Driver Seat Belt Switch Circuit Open

DTC B0072 05

Driver Seat Belt Switch Circuit High Voltage/Open

DTC B0072 06

Driver Seat Belt Switch Circuit Low Voltage/Open

DTC B0072 08

Driver Seat Belt Switch Circuit Performance - Signal Invalid

DTC B0072 0B

Driver Seat Belt Switch Circuit High Current

DTC B0072 0C

Driver Seat Belt Switch Circuit Low Current

DTC B0073 01

Passenger Seat Belt Switch Circuit Short to Battery

DTC B0073 02

Passenger Seat Belt Switch Circuit Short to Ground

DTC B0073 04

Passenger Seat Belt Switch Circuit Open

DTC B0073 05

Passenger Seat Belt Switch Circuit High Voltage/Open

DTC B0073 06

Passenger Seat Belt Switch Circuit Low Voltage/Open

DTC B0073 08

Passenger Seat Belt Switch Circuit Performance - Signal Invalid

DTC B0073 0B

Passenger Seat Belt Switch Circuit High Current

DTC B0073 0C

Passenger Seat Belt Switch Circuit Low Current

Diagnostic Fault Information

Seat Belts

Circuit/System Description

The inflatable restraint seat belt buckle switch is within the seat belt buckle and provides an input to the inflatable restraint sensing and diagnostic module (SDM). The inflatable restraint sensing and diagnostic module supplies a low reference circuit and a seat belt switch signal circuit to determine a buckled or unbuckled condition. The inflatable restraint sensing and diagnostic module monitors the seat belt switch circuits and if a fault is detected a DTC will be set.

Conditions for Running the DTC

Ignition voltage is between 9 - 16 V.

Conditions for Setting the DTC

B0072 01 or B0073 01

The seat belt switch circuit is shorted to voltage.

B0072 02 or B0073 02

The seat belt switch circuit is shorted to ground.

B0072 04 or B0073 03

The seat belt switch circuit is open.

B0072 05 or B0073 05

The seat belt switch circuit is shorted to voltage or open.

B0072 06 or B0073 06

The seat belt switch circuit is shorted to ground or open.

B0072 08 or B0073 08

The seat belt switch signal is invalid.

B0072 0B or B0073 0B

The seat belt switch signal is above threshold.

B0072 0C or B0073 0C

The seat belt switch signal is below threshold.

Action Taken When the DTC Sets

The inflatable restraint sensing and diagnostic module will store a DTC and illuminate the air bag indicator in the instrument cluster.

Conditions for Clearing the DTC

The condition for setting the DTC no longer exists.

Reference Information

Schematic Reference

Seat Belt Wiring Schematics

Connector End View Reference

COMPONENT CONNECTOR END VIEWS - 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

Control Module References for scan tool information.

Circuit/System Verification

1. Ignition ON.

2. Verify the appropriate scan tool Seat Belt Status parameter changes between Buckled and Unbuckled when the seat belt is buckled and unbuckled.

  • If the parameter does not change

Refer to Circuit/System Testing.

  • Go to next step: If the parameter changes

3. All OK.

Circuit/System Testing

NOTE: When removing connectors inspect for damage or corrosion. Damage or corrosion in the following requires repair or replacement of the affected component/connector.

  • Seat Belt Buckle-Driver
  • Seat Belt Buckle-Passenger
  • Inflatable Restraint Sensing and Diagnostic Module

1. Ignition OFF. Scan tool disconnected. Disconnect the harness connector at the appropriate Seat Belt Buckle. It may take up to 2 min for all vehicle systems to power down.

2. Test for less than 5 Ω between the low reference circuit terminal 2 and ground.

  • If 5 Ω or greater
  1. Ignition OFF, disconnect the harness connector at the Inflatable Restraint Sensing and Diagnostic Module.
  2. Test for less than 2 Ω in the low reference circuit end to end.
    • If 2 Ω or greater, repair the open/high resistance in the circuit.
    • If less than 2 Ω, replace the Inflatable Restraint Sensing and Diagnostic Module.
  • Go to next step: If less than 5 Ω

3. Ignition ON.

4. Verify the appropriate scan tool Seat Belt Status parameter is Buckled.

  • If not Buckled
  1. Ignition OFF, disconnect the harness connector at the Inflatable Restraint Sensing and Diagnostic Module.
  2. Test for infinite resistance between the signal circuit terminal 1 and ground.
    • If less than infinite resistance, repair the short to ground on the circuit.
    • If infinite resistance, replace the Inflatable Restraint Sensing and Diagnostic Module.
  • Go to next step: If Buckled

5. Install a 3 A fused jumper wire between the signal circuit terminal 1 and the low reference circuit terminal 2.

6. Verify the appropriate scan tool Seat Belt Status parameter is Unbuckled.

  • If not Unbuckled
  1. Ignition OFF, disconnect the harness connector at the Inflatable Restraint Sensing and Diagnostic Module, ignition ON.
  2. 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.
    • Go to next step: If less than 1 V
  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 Inflatable Restraint Sensing and Diagnostic Module.
  • Go to next step: If Unbuckled

7. Test or replace the Seat Belt Buckle.

Component Testing

1. Ignition OFF. Scan tool disconnected. Disconnect the harness connector at the appropriate Seat Belt Buckle. It may take up to 2 min for all vehicle systems to power down.

2. Test for infinite resistance between the signal terminal 1 and the low reference terminal 2.

  • If less than infinite resistance

Replace the B153 Seat Belt Buckle.

  • Go to next step: If infinite resistance

3. Insert the seat belt into the buckle.

4. Test for less than 5 Ω between the signal terminal 1 and the low reference terminal 2.

  • If 5 Ω or greater

Replace the Seat Belt Buckle.

  • Go to next step: If less than 5 Ω

5. All OK.

Repair Instructions

Perform the Diagnostic Repair Verification after completing the repair.

  • Front Seat Belt Buckle Replacement
  • Control Module References for inflatable restraint sensing and diagnostic module replacement, programming, and setup.

DTC B0075-B0077

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 B0075

Left Rear Seat Belt Switch Circuit

DTC B0076

Right Rear Seat Belt Switch Circuit

DTC B0077

Center Rear Seat Belt Switch Circuit

For symptom byte information refer to Symptom Byte List.

Diagnostic Fault Information

Seat Belts

Circuit/System Description

The inflatable restraint seat belt buckle switch is within the seat belt buckle and provides an input to the Inflatable Restraint Sensing and Diagnostic Module (SDM). The Inflatable Restraint Sensing and Diagnostic Module supplies a low reference circuit and a seat belt switch signal circuit to determine a buckled or unbuckled condition. The Inflatable Restraint Sensing and Diagnostic Module monitors the seat belt switch circuits and if a fault is detected a DTC will be set.

Conditions for Running the DTC

Ignition voltage is between 9 - 16 V.

Conditions for Setting the DTC

B0075 01, B0076 01, or B0077 01

The seat belt switch circuit is shorted to voltage.

B0075 02, B0076 02, or B0077 02

The seat belt switch circuit is shorted to ground.

B0075 04, B0076 04, or B0077 04

The seat belt switch circuit is open.

B0075 05, B0076 05, or B0077 05

The seat belt switch circuit is shorted to voltage or open.

B0075 06, B0076 06, or B0077 06

The seat belt switch circuit is shorted to ground or open.

B0075 08, B0076 08, or B0077 08

The seat belt switch signal is invalid.

B0075 0B, B0076 0B, or B0077 0B

The seat belt switch signal is above threshold.

B0075 0C, B0076 0C, or B0077 0C

The seat belt switch signal is below threshold.

Action Taken When the DTC Sets

The Inflatable Restraint Sensing and Diagnostic Module will store a DTC and illuminate the Air Bag indicator in the instrument cluster.

Conditions for Clearing the DTC

The condition for setting the DTC no longer exists.

Reference Information

Schematic Reference

SIR Wiring Schematics

Connector End View Reference

COMPONENT CONNECTOR END VIEWS - INDEX

Description and Operation

Seat Belt System Description and Operation

Electrical Information Reference

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

Scan Tool Reference

Control Module References for scan tool information.

Circuit/System Verification

1. Ignition ON.

2. Verify the appropriate scan tool Seat Belt Status parameter changes between Buckled and Unbuckled when the seat belt is buckled and unbuckled.

  • If the parameter does not change

Refer to Circuit/System Testing.

  • Go to next step: If the parameter changes

3. All OK.

Circuit/System Testing

NOTE: When removing connectors inspect for damage or corrosion. Damage or corrosion in the following requires repair or replacement of the affected component/connector.

  • B88RR Seat Belt Switch-Right Rear
  • B88A Seat Belt Switch-Rear Middle Left
  • K36 Inflatable Restraint Sensing and Diagnostic Module

1. Ignition OFF, disconnect the harness connector at the appropriate B88 seat belt switch.

2. Test for less than 5 Ω between the low reference circuit terminal 2 and ground.

  • If 5 Ω or greater
  1. Ignition OFF, disconnect the harness connector at the K36 Inflatable Restraint Sensing and Diagnostic Module.
  2. Test for less than 2 Ω in the low reference 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 Sensing and Diagnostic Module.
  • Go to next step: If less than 5 Ω

3. Ignition ON.

4. Verify the appropriate scan tool Seat Belt Status parameter is Buckled.

  • If not Buckled
  1. Ignition OFF, disconnect the harness connector at the K36 Inflatable Restraint Sensing and Diagnostic Module.
  2. Test for infinite resistance between the signal circuit terminal 1 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.
  • Go to next step: If Buckled

5. Install a 3 A fused jumper wire between the signal circuit terminal 1 and the low reference circuit terminal 2.

6. Verify the appropriate scan tool Seat Belt Status parameter is Unbuckled.

  • If not Unbuckled
  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 signal circuit and ground.
    • If 1 V or greater, repair the short to voltage on the circuit.
    • Go to next step: If less than 1 V
  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 sensing and diagnostic module.
  • Go to next step: If Unbuckled

7. Test or replace the B88 Seat Belt Switch.

Component Testing

1. Ignition OFF, disconnect the harness connector at the B88 Seat Belt Switch.

2. Test for infinite resistance between the signal terminal 1 and the low reference terminal 2.

  • If less than infinite resistance

Replace the B88 Seat Belt Switch.

  • Go to next step: If infinite resistance

3. Insert the seat belt into the buckle.

4. Test for less than 5 Ω between the signal terminal 1 and the low reference terminal 2.

  • If 5 Ω or greater

Replace the B88 Seat Belt Switch.

  • Go to next step: If less than 5 Ω

5. All OK.

Repair Instructions

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

  • Front Seat Belt Buckle Replacement
  • Rear Seat Belt Buckle Replacement
  • SIR/SRS Wiring Repairs
  • Control Module References for inflatable restraint sensing and diagnostic module replacement, setup, and programming

Symptoms - Seat Belts

NOTE: Review the seat belt system description and operation in order to familiarize yourself with the system and how it functions.

Visual/Physical Inspection

  • Inspect for aftermarket devices which could affect the operation of the seat belt system. Refer to Checking Aftermarket Accessories.
  • Inspect the easily accessible or visible system components for obvious damage or conditions which could cause the symptom.

Intermittent

Faulty electrical connections or wiring may be the cause of intermittent conditions. Refer to Testing for Intermittent Conditions and Poor Connections.

Symptom List

Refer to the following symptom diagnostic procedure in order to diagnose the symptom:

  • Seat Belt Indicator Malfunction - Driver
  • Seat Belt Indicator Malfunction - Passenger

SEAT BELT INDICATOR MALFUNCTION - DRIVER

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.

Diagnostic Fault Information

Seat Belts

1. Seat Belt Indicator Always Illuminated
2. Seat Belt Indicator Inoperative

Circuit/System Description

The driver seat belt switch is a 2-wire switch wired to the inflatable restraint sensing and diagnostic module (SDM) using a signal circuit and a low reference circuit. When the seat belt is unbuckled the switch is closed, and when the seat belt is buckled the switch is open. The SDM sends the status of the driver seat belt via serial data to the instrument cluster. After receiving the message, the instrument cluster controls the illumination of the driver seat belt indicator.

Reference Information

Schematic Reference

  • Seat Belt Wiring Schematics
  • SIR Wiring Schematics

Connector End View Reference

COMPONENT CONNECTOR END VIEWS - INDEX

Description and Operation

Seat Belt 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 Verification

1. Command the instrument cluster all indicators ON and OFF with a scan tool. The driver seat belt indicator should turn ON and OFF as commanded.

  • If the driver seat belt indicator does not turn ON and OFF as commanded

Replace the P16 instrument cluster.

  • Go to next step: If the driver seat belt indicator does turn ON and OFF as commanded

2. Monitor the scan tool Driver Seat Belt Switch parameter while buckling and unbuckling the seat belt. The parameter should display Buckled and Unbuckled when changing seat belt states.

  • If the scan tool Driver Seat Belt Switch parameter does not display Buckled and Unbuckled when changing seat belt states

Refer to Circuit/System Testing.

  • Go to next step: If the scan tool Driver Seat Belt Switch parameter does display Buckled and Unbuckled when changing seat belt states

3. All OK.

Circuit/System Testing

NOTE: When removing connectors inspect for damage or corrosion. Damage or corrosion in the following requires repair or replacement of the affected component/connector.

  • B88 Seat belt switch
  • Seat belt switch harness connector
  • K36 SDM
  • SDM wiring harness connector

1. Ignition OFF.

2. Disconnect the harness connector at the B88 seat belt switch.

3. Test for less than 10 Ω between the low reference circuit terminal 1 and ground.

  • If 10 Ω or greater
  1. Disconnect the harness connector at the K36 SDM.
  2. Test for less than 2 Ω in each control 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 SDM.
  • Go to next step: If less than 10 Ω

4. Ignition ON.

5. Verify the scan tool Driver Seat Belt Status parameter displays Buckled.

  • If the scan tool Driver Seat Belt Status parameter does not display Buckled
  1. Disconnect the harness connector at the K36 SDM.
  2. Test for infinite resistance between the seat belt switch signal circuit terminal 2 and ground.
    • If less than infinite resistance, repair the short to ground on the circuit.
    • If less than 2 Ω, replace the K36 SDM.
  • Go to next step: If the scan tool Driver Seat Belt Status parameter does display Buckled

6. Install a 3 A fused jumper wire between the signal circuit terminal 2 and the low reference circuit terminal 1.

7. Verify the scan tool Driver Seat Belt Status parameter displays Unbuckled.

  • If the scan tool Driver Seat Belt Status parameter does not display Unbuckled
  1. Disconnect the harness connector at the K36 SDM.
  2. Ignition ON.
  3. 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.
  4. Test for less than 2 Ω in each 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 SDM.
  • Go to next step: If the scan tool Driver Seat Belt Status parameter does display Unbuckled

8. Replace the B88 seat belt switch.

Component Testing

1. Ignition OFF.

2. Disconnect the harness connector at the B88 seat belt switch.

3. B88 seat belt switch in the open position.

4. Test for infinite resistance between the signal circuit terminal 2 and the low reference terminal 1 at the B88 seat belt switch.

  • If there is not infinite resistance

Replace the B88 seat belt switch.

  • Go to next step: If there is infinite resistance

5. B88 seat belt switch in the closed position.

6. Test for less than 1 Ω between the signal circuit terminal 2 and the low reference terminal 1 at the B88 seat belt switch.

  • If 1 Ω or greater

Replace the B88 seat belt switch.

  • Go to next step: If less than 1 Ω

7. All OK.

Repair Instructions

  • Perform the Diagnostic Repair Verification after completing the diagnostic procedure.
  • Front Seat Belt Buckle Replacement
  • Control Module References for SDM and instrument cluster replacement, programming and setup

Seat Belt Indicator Malfunction - Passenger

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.

Diagnostic Fault Information

Seat Belts

1. Indicator will remain ON with seat belt buckled.
2. Indicator will illuminate only for the bulb check.
3. Indicator will not illuminate.
4. Indicator always ON.

Circuit/System Description

When an individual is sitting in the passenger seat the passenger presence sensor detects the individual.

A signal to the inflatable restraint sensing and diagnostic module indicates a person is in the passenger seat. The inflatable restraint sensing and diagnostic module will turn the passenger seat belt indicator on.

The passenger seat belt switch is a 2-wire switch wired to the inflatable restraint sensing and diagnostic module (SDM) using a signal circuit and a low reference circuit. When the seat belt is unbuckled the switch is closed, and when the seat belt is buckled the switch is open. The inflatable restraint sensing and diagnostic module sends the status of the passenger seat belt via a hard wire to the passenger air bag disable switch. After receiving the message, the passenger air bag disable switch controls the illumination of the passenger seat belt indicator.

Diagnostic Aids

Objects on the passenger seat can cause the passenger seat belt reminder to be commanded on.

Depending on the sensing technology used, a conductive object (computers, MP3 players, cell phones, diagnostic scan tool, wires, a hand, etc.) placed on the passenger seat may cause the passenger presence module to command the passenger air bag indicator ON and/or command the passenger seat belt indicator ON. The fasten seat belt chime will also sound.

Reference Information

Schematic Reference

Seat Belt Wiring Schematics

Connector End View Reference

COMPONENT CONNECTOR END VIEWS - INDEX

Description and Operation

Seat Belt 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 Verification

1. Ignition ON.

2. Verify the passenger seat belt indicator turns ON and OFF when performing the Passenger Seat Belt Reminder Indicator On/Off Control Function with a scan tool.

  • If the passenger seat belt indicator does not turn ON and OFF

Refer to Circuit/System Testing - Seat Belt Indicator Malfunction.

  • Go to next step: If the passenger seat belt indicator turns ON and OFF

3. Verify the scan tool Passenger Seat Belt Status parameter changes between Buckled and Unbuckled when buckling and unbuckling the seat belt.

  • If the parameter does not change between Buckled and Unbuckled when buckling and unbuckling the seat belt

Refer to Circuit/System Testing - Seat Belt Switch Malfunction.

  • Go to next step: If the parameter changes between Buckled and Unbuckled when buckling and unbuckling the seat belt

4. All OK.

Circuit/System Testing

Seat Belt Switch Malfunction

NOTE: When removing connectors inspect for damage or corrosion.

Damage or corrosion in the following requires repair or replacement of the affected component/connector.

  • B153P Seat Belt Buckle - Passenger
  • Seat belt switch harness connector
  • K36 Inflatable Restraint Sensing and Diagnostic Module
  • Inflatable Restraint Sensing and Diagnostic Module harness connector

1. Ignition OFF and all vehicle systems OFF, disconnect the harness connector at the B153 Seat Belt Buckle - Passenger. It may take up to 2 min for all vehicle systems to power down.

2. Test for less than 5 Ω between the low reference circuit terminal 1 and ground.

  • If 5 Ω or greater
  1. Disconnect the harness connector at the K36 Inflatable Restraint Sensing and Diagnostic Module.
  2. Test for less than 2 Ω in each control 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 Sensing and Diagnostic Module.
  • Go to next step: If less than 5 Ω

3. Ignition ON.

4. Verify the scan tool Passenger Seat Belt Status parameter is Buckled.

  • If the scan tool Passenger Seat Belt Status parameter does not display Buckled
  1. Disconnect the harness connector at the K36 Inflatable Restraint Sensing and Diagnostic Module.
  2. Test for infinite resistance between the signal circuit terminal 2 and ground.
    • If less than infinite resistance, repair the short to ground on the circuit.
    • If less infinite resistance, replace the K36 Inflatable Restraint Sensing and Diagnostic Module.
  • Go to next step: If the scan tool Passenger Seat Belt Status parameter does display Buckled

5. Install a 3 A fused jumper wire between the signal circuit terminal 2 and the ground circuit terminal 1.

6. Verify the scan tool Passenger Seat Belt Status parameter is Unbuckled.

  • If the scan tool Passenger Seat Belt Status parameter is not Unbuckled
  1. Disconnect the harness connector at the K36 Inflatable Restraint Sensing and Diagnostic Module.
  2. Ignition ON.
  3. 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.
    • Go to next step: If less than 1 V
  4. Test for less than 2 Ω in each 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 Sensing and Diagnostic Module.
  • Go to next step: If the scan tool Passenger Seat Belt Status parameter does display Unbuckled

7. Ignition OFF, connect all harness connectors. Ignition ON.

8. Verify the scan tool Passenger Seat Belt Status parameter changes between Buckled and Unbuckled when buckling and unbuckling the seat belt.

  • If the Passenger Seat Belt Status parameter is not Buckled and Unbuckled

Test or replace the B153 Seat Belt Buckle - Passenger.

  • Go to next step: If the Passenger Seat Belt Status parameter does display Buckled and Unbuckled

9. All OK.

Seat Belt Indicator Malfunction

1. Ignition OFF and all vehicle systems OFF, disconnect the harness connector at the P14 Passenger Air Bag Disable Indicator. It may take up to 2 min for all vehicle systems to power down.

2. Test for less than 20 Ω between the ground circuit terminal 3 and ground.

  • If 20 Ω or greater
  1. Ignition OFF.
  2. Test for less than 2 Ω in the ground circuit end to end.
    • If 2 Ω or greater, repair the open/high resistance in the circuit.
    • If less than 2 Ω, repair the open/high resistance in the ground connection.
  • Go to next step: If less than 20 Ω

3. Test for 3-7 V between terminal 6 and ground when commanding the Passenger Seat Belt Reminder On with a scan tool.

  • If greater then the specified range
  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 1V or greater, repair the short to voltage on the circuit.
    • If less than 1V, replace the K36 Inflatable Restraint Sensing and Diagnostic Module.
  • If less then the specified range
  1. Ignition OFF, 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.
  3. Test for less than 2 Ω in the control 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 Sensing and Diagnostic Module.
  • Go to next step: If between 3-7 V

4. Test for less than 1 V between terminal 6 and ground when commanding the Passenger Seat Belt Reminder OFF with a scan tool.

  • If greater than 1 V

Replace the K36 Inflatable Restraint Sensing and Diagnostic Module

  • Go to next step: If less than 1 V

5. Test or replace the P14 Passenger Air Bag Disable Indicator.

Component Testing

1. Ignition OFF, disconnect the harness connector at the B153 Seat Belt Buckle - Passenger.

2. Buckle the passenger seat belt.

3. Test for infinite resistance between the signal circuit terminal 2 and the low reference circuit terminal 1.

  • If less than infinite resistance

Replace the B153 Seat Belt Buckle - Passenger.

  • Go to next step: If infinite resistance

4. B88 seat belt switch in the unbuckled position.

5. Test for less than 2 Ω between the signal circuit terminal 2 and the low reference terminal 1.

  • If 2 Ω or greater

Replace the B153 Seat Belt Buckle - Passenger.

  • Go to next step: If less than 2 Ω

6. All OK.

Repair Instructions

Perform the Diagnostic Repair Verification after completing the repair

  • Front Seat Belt Buckle Replacement
  • Refer to Instrument Panel Assembly Replacement for S48C Multifunction Switch 1 - Instrument Panel replacement
  • Control Module References for inflatable restraint sensing and diagnostic module replacement, programming and setup

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