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Seat Belt Indicator Circuit 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

Circuit

Short to Ground

High Resistance

Open

Short to Voltage

Signal Performance

Passenger Seat Belt Switch Signal

1

2

2

2

-

Passenger Seat Belt Switch Low Reference

-

2

2

2

-

1. Indicator will remain ON with seat belt buckled.

2. Indicator will illuminate only for the bulb check.

Circuit/System Description

When an individual is sitting in the passenger seat the passenger presence sensor detects the individual. A signal to the SDM indicates a person is in the passenger seat. The SDM will turn the passenger seat belt indicator. 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 SDM sends the status of the passenger seat belt via a hard wire to the passenger air bag disable indicator. After receiving the message, the passenger air bag disable indicator controls the illumination of the passenger seat belt indicator.

Reference Information

Schematic Reference

Seat Belt Schematics

Connector End View Reference

Component Connector End Views

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. Have someone sit in the passenger seat.
  3. With a scan tool verify the Automatic Occupant Sensing Current Front Occupancy Status indicates Occupied.
    4. [ARW-LISTFAIL]

  4. If the Automatic Occupant Sensing Current Front Occupancy Status does not indicate Occupied

    5. [/ARW-LISTFAIL]
    3.1. Disconnect the harness connector at the K36 SDM.
    3.2. Test for infinite resistance between the following circuit's terminal and ground:
            • Sensor signal circuit terminal
            • Sensor low reference circuit terminal
    [ARW-LISTFAIL]

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

    6. [/ARW-LISTFAIL]
    3.3. Test for less than 2 Ω in each circuit end to end.
    [ARW-LISTFAIL]

  6. If 2 Ω or greater, repair the open/high resistance in the circuit.

  7. If less than 2 Ω, replace the passenger presence sensor.

    8. [/ARW-LISTFAIL] [ARW-LISTPASS]

  8. If the Automatic Occupant Sensing Current Front Occupancy Status does indicate Occupied

    9. [/ARW-LISTPASS]
  9. Ignition ON.
  10. With a scan tool perform the Passenger Seat Belt Reminder Indicator On/Off Control Function and verify the passenger seat belt indicator turns on and off.
    11. [ARW-LISTFAIL]

  11. If the passenger seat belt indicator does not turn on and off

    Refer to Seat Belt Indicator Malfunction.

    12. [/ARW-LISTFAIL][ARW-LISTPASS]

  12. If the passenger seat belt indicator does turn on and off

    13. [/ARW-LISTPASS]
  13. With the scan tool monitor the Passenger Seat Belt Status parameter while buckling and unbuckling the seat belt. The parameter should display Buckled and Unbuckled when buckling and unbuckling the seat belt.
    14. [ARW-LISTFAIL]

  14. If the Passenger Seat Belt Status parameter does not display Buckled and Unbuckled

    Refer to Seat Belt Switch Malfunction.

    15. [/ARW-LISTFAIL][ARW-LISTPASS]

  15. If the Passenger Seat Belt Status parameter does display Buckled and Unbuckled

    16. [/ARW-LISTPASS]
  16. Replace the passenger presence sensor.

Circuit/System Testing

Seat Belt Switch Malfunction

  1. Ignition OFF.
  2. Disconnect the harness connector at the appropriate B88 passenger seat belt switch.
  3. Test for less than 5 Ω between the ground circuit terminal 2 and ground.
    4. [ARW-LISTFAIL]

  4. If 5 Ω or greater

    5. [/ARW-LISTFAIL]
    3.1. Disconnect the harness connector at the K36 SDM.
    3.2. Test for less than 2 Ω in each control circuit end to end.
    [ARW-LISTFAIL]

  5. If 2 Ω or greater, repair the open/high resistance in the circuit.

  6. If less than 2 Ω, replace the K36 SDM.

    7. [/ARW-LISTFAIL][ARW-LISTPASS]

  7. If less than 5 Ω

    8. [/ARW-LISTPASS]
  8. Ignition ON.
  9. Verify the scan tool Passenger Seat Belt Status parameter listed below is Buckled.
    10. [ARW-LISTFAIL]

  10. If the scan tool Passenger Seat Belt Status parameter does not display Buckled

    11. [/ARW-LISTFAIL]
    5.1. Disconnect the harness connector at the K36 SDM.
    5.2. Test for infinite resistance between the seat belt switch signal circuit terminal 2 and ground.
    [ARW-LISTFAIL]

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

  12. If less than 2 Ω, replace the K36 SDM.

    13. [/ARW-LISTFAIL] [ARW-LISTPASS]

  13. If the scan tool Passenger Seat Belt Status parameter does display Buckled

    14. [/ARW-LISTPASS]
  14. Install a 3 A fused jumper wire between the signal circuit terminal 1 and the ground circuit terminal 2.
  15. Verify the scan tool Passenger Seat Belt Status parameter is Unbuckled.
    16. [ARW-LISTFAIL]

  16. If the scan tool Passenger Seat Belt Status parameter does not display Unbuckled

    17. [/ARW-LISTFAIL]
    7.1. Disconnect the harness connector at the K36 SDM.
    7.2. Ignition ON.
    7.3. Test for less than 1 V between the signal circuit and ground.
    [ARW-LISTFAIL]

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

    18. [/ARW-LISTFAIL]
    7.4. Test for less than 2 Ω in each circuit end to end.
    [ARW-LISTFAIL]

  18. If 2 Ω or greater, repair the open/high resistance in the circuit.

  19. If less than 2 Ω, replace the K36 SDM.

    20. [/ARW-LISTFAIL] [ARW-LISTPASS]

  20. If the scan tool Passenger Seat Belt Status parameter does display Unbuckled

    21. [/ARW-LISTPASS]
  21. Replace the B88 passenger seat belt switch.

Seat Belt Indicator Malfunction

  1. Ignition OFF.
  2. Disconnect the harness connector at the P14 passenger air bag disable indicator.
  3. Test for less than 5 Ω between the ground circuit terminal 4 and ground.
    4. [ARW-LISTFAIL]

  4. If 5 Ω or greater

    5. [/ARW-LISTFAIL]
    3.1. Disconnect the harness connector at the K36 SDM.
    3.2. Test for less than 2 Ω in each control circuit end to end.
    [ARW-LISTFAIL]

  5. If 2 Ω or greater, repair the open/high resistance in the circuit.

  6. If less than 2 Ω, replace the K36 SDM.

    7. [/ARW-LISTFAIL][ARW-LISTPASS]

  7. If less than 5 Ω

    8. [/ARW-LISTPASS]
  8. Connect a test lamp between the control circuit terminal 6 and ground.
  9. Ignition ON.
  10. Command the Passenger Seat Belt Reminder ON and OFF with a scan tool, the test lamp should turn ON and OFF while changing between the commanded states.
    11. [ARW-LISTFAIL]

  11. If the test lamp is always on

    12. [/ARW-LISTFAIL]
    6.1. Ignition OFF.
    6.2. Disconnect the harness connector at the K36 SDM.
    6.3. Ignition ON.
    6.4. Test for less than 1 V between the signal circuit and ground.
    [ARW-LISTFAIL]

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

  13. If less than 1 V, replace the K36 SDM.

    14. [/ARW-LISTFAIL] [ARW-LISTFAIL]

  14. If the test lamp is always off

    15. [/ARW-LISTFAIL]
    6.1. Disconnect the harness connector at the K36 SDM.
    6.2. Test for infinite resistance between the seat belt switch signal circuit terminal 6 and ground.
    [ARW-LISTFAIL]

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

    16. [/ARW-LISTFAIL]
    6.3. Test for less than 2 Ω in each control circuit end to end.
    [ARW-LISTFAIL]

  16. If 2 Ω or greater, repair the open/high resistance in the circuit.

  17. If less than 2 Ω, replace the K36 SDM.

    18. [/ARW-LISTFAIL] [ARW-LISTPASS]

  18. If test lamp turns on and off while changing between the commanded states

    19. [/ARW-LISTPASS]
  19. Replace the P14 passenger air bag disable indicator.

Component Testing
  1. Ignition OFF.
  2. Disconnect the harness connector at the appropriate B88 passenger seat belt switch.
  3. B88 seat belt buckle in the open position.
  4. Test for infinite resistance between the signal circuit terminal 1 and the ground terminal 2 at the B88 passenger seat belt switch.
    5. [ARW-LISTFAIL]

  5. If there is not infinite resistance

    Replace the B88 passenger seat belt switch.

    6. [/ARW-LISTFAIL][ARW-LISTPASS]

  6. If there is infinite resistance

    7. [/ARW-LISTPASS]
  7. B88 seat belt switch in the closed position.
  8. Test for less than 2 Ω between the signal circuit terminal 1 and the ground terminal 2 at the B88 passenger seat belt switch.
    9. [ARW-LISTFAIL]

  9. If 2 Ω or greater

    Replace the B88 passenger seat belt switch.

    10. [/ARW-LISTFAIL][ARW-LISTPASS]

  10. If less than 2 Ω

    11. [/ARW-LISTPASS]
  11. All OK.

Repair Instructions

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

    •  Driver Information Display Replacement
    •  Front Seat Belt Buckle Replacement
    •  Front Seat Cushion Cover and Pad Replacement
    • Control Module References for SDM replacement, setup, and programming
   


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