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Tahoe / Yukon Service Manual

Seat Belt Indicator Malfunction - Driver

Diagnostic Instructions Perform the Diagnostic System Check prior to using this diagnostic procedure: Diagnostic System Check - Vehicle Review the description of Strategy Based Diagnosis: Strategy Based Diagnosis An overview of each diagnostic category can be found here: Diagnostic Procedure Instructions Diagnostic Fault Information

Circuit Short to Ground Open/High Resistance Short to Voltage Signal Performanc
Signal — Terminal 2 @ B153D Front Seat Belt Buckle - Driver 1 2 2 —
Low Reference — Terminal 1 @ B153D Front Seat Belt Buckle - Driver — 2 — —
1. Seat Belt Reminder Indicator = Always On 2. Seat Belt Reminder Indicator = Always Off

Circuit/System Description For an overview of the component/system, refer to: Seat Belt System Description and Operation

Circuit Description
Signal The control module input circuit has an internal resistance connected to 12 V.
Low Reference Grounded through the control module.
Component Description
B153D Front Seat Belt Buckle - Driver When the seat belt is unbuckled the switch is closed, and when the seat belt is buckled the switch is open.
K36 Restraints Control Module The control module monitors several sensors that can detect a collision. When a collision is detected, the control module will trigger certain air bags and seat belt pretensioners, depending on the angle and severity of the impact.

Reference Information Schematic Reference Seat Belt Schematics Connector End View Reference Master Electrical Component List Electrical Information Reference Circuit Testing Connector Repairs Testing for Intermittent Conditions and Poor Connections Wiring Repairs Electrical Relay Replacement Scan Tool Reference Control Module References Circuit/System Verification

  1. Ignition » On / Vehicle » In Service Mode
  2. Perform the appropriate scan tool control function: All Indicators @ P16 Instrument Cluster » On and Off Verify the component turns On and Off: Seat Belt Reminder Indicator ⇒ If the component does not turn On and Off Replace the appropriate component: P16 Instrument Cluster ⇓ If the component turns On and Off
  3. Operate the component: B153D Front Seat Belt Buckle - Driver » Buckled Verify the scan tool parameter: Driver Seat Belt Status = Buckled ⇒ If not the specified state Refer to: Circuit/System Testing ⇓ If the specified state
  4. Operate the component: B153D Front Seat Belt Buckle - Driver » Unbuckled Verify the scan tool parameter: Driver Seat Belt Status = Unbuckled ⇒ If not the specified state Refer to: Circuit/System Testing ⇓ If the specified state
  5. The condition is not currently present and may be an intermittent fault. Circuit/System Testing Refer to: SIR Service Precautions Refer to: SIR Disabling and Enabling. Inspect the terminals of the following components and connectors for damage or corrosion and repair or replace as necessary: B153D Front Seat Belt Buckle - Driver B153D Front Seat Belt Buckle - Driver& Harness Connector K36 Inflatable Restraint Sensing and Diagnostic Module K36 Inflatable Restraint Sensing and Diagnostic Module & Harness Connector
  6. Ignition » On / Vehicle » In Service Mode
  7. Disconnect the electrical connector: B153D Front Seat Belt Buckle - Driver
  8. Test for less than 5 Ω between the test points: Low Reference terminal 1 & Ground ⇒ If 5 Ω or greater 3.1. Before attempting these procedures, the SIR system must be disabled. 3.2. Disconnect the electrical connector: K36 Restraints Control Module 3.3. Test for less than 2 Ω between the test points: Low Reference circuit terminal 1 @ B153D  Front Seat Belt Buckle - Driver & The other end of the circuit ⇒ If 2 Ω or greater » Repair the open/high resistance in the circuit. ⇒ If less than 2 Ω » Replace the component: K36 Restraints Control Module ⇓ If less than 5 Ω
  9. Ignition » On / Vehicle » In Service Mode
  10. Verify the scan tool parameter: Driver Seat Belt Status = Buckled ⇒ If not the specified state 5.1. Ignition/Vehicle » Off 5.2. Before attempting these procedures, the SIR system must be disabled. 5.3. Disconnect the electrical connector: K36 Restraints Control Module 5.4. Test for infinite resistance between the test points: Signal circuit terminal 2 @ Component harness & Ground ⇒ If less than infinite resistance » Repair the short to ground on the circuit. ⇒ If infinite resistance » Replace the component: K36 Restraints Control Module ⇓ If the specified state
  11. Connect a 3 A fused jumper wire between the test points: Signal circuit terminal 2 & Low Reference circuit terminal 1
  12. Verify the scan tool parameter: Driver Seat Belt Status = Unbuckled ⇒ If not the specified state 7.1. Ignition/Vehicle » Off & Remove » Jumper wire(s) 7.2. Before attempting these procedures, the SIR system must be disabled. 7.3. Disconnect the electrical connector: K36 Restraints Control Module 7.4. Ignition » On / Vehicle » In Service Mode 7.5. Test for less than 1 V between the test points: Signal circuit terminal 2 @ Component harness & Ground ⇒ If 1 V or greater » Repair the short to voltage on the circuit. ⇓ If less than 1 V 7.6. Ignition/Vehicle » Off 7.7. Test for less than 2 Ω between the test points: Signal circuit terminal 2 @ Component harness & The other end of the circuit ⇒ If 2 Ω or greater » Repair the open/high resistance in the circuit. ⇒ If less than 2 Ω » Replace the component: K36 Restraints Control Module ⇓ If the specified state
  13. Test or replace the component: B153D Front Seat Belt Buckle - Driver Repair Instructions Perform the Diagnostic Repair Verification after completing the repair: Diagnostic Repair Verification Front Seat Belt Buckle Replacement For control module replacement, programming, and setup refer to: Control Module References