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Home >> Chevrolet >> 2002 >> Blazer 4D Utility, 4WD, Part Time >> Repair and Diagnosis >> External Pages >> Different car >> Section 1570 (Instrument Panel, Gauges & Console) >> Repair Instructions >> Instrument Panel (I/P) Harness Replacement >> Removal Procedure

Removal Procedure

WARNING: This page is about a different car, the 2002 Oldsmobile Bravada, 2002 GMC Envoy XL, 2002 GMC Envoy, and 2002 Chevrolet TrailBlazer. However, it is still accessible from the selected car via links, so may be relevant.
CAUTION: Refer to BATTERY DISCONNECT CAUTION in Cautions and Notices.
  1. Disconnect the battery negative cable.
  2. Disable the SIR. Refer to DISABLING SYSTEM .
  3. Remove the front seats. Refer to SEAT REPLACEMENT - FRONT BUCKET in Seats.
  4. If replacing the IP harness on a TrailBlazer, Envoy or Bravada, remove the rear seat cushions. Refer to SEAT CUSHION REPLACEMENT - REAR NO. 1 (TRAILBLAZER, ENVOY, BRAVADA) in Seats
  5. If replacing the IP harness on TrailBlazer EXT or Envoy XL, remove the second row seats. Refer to SEAT REPLACEMENT - REAR NO. 1 (TRAILBLAZER EXT, ENVOY XL) in Seats
  6. Remove the center console. Refer to Console Replacement 
  7. Remove the instrument panel (IP). Refer to Instrument Panel (I/P) Assembly Replacement .
  8. Fold the front portion of the rear carpet in order to reveal the IP harness connected to the rear electrical center. Refer to CARPET REPLACEMENT - REAR (TRAILBLAZER, ENVOY, BRAVADA) or CARPET REPLACEMENT - REAR (TRAILBLAZER EXT, ENVOY XL) in Interior Trim.
  9. Remove the IP harness from the rear electrical center. Refer to REAR ELECTRICAL CENTER OR JUNCTION BLOCK REPLACEMENT in Wiring Systems.
  10. Disconnect the inline IP harness electrical connectors from the body wiring harness electrical connector.
    Fig 1: Disconnecting/Connecting Inline IP Harness Electrical Connectors
    GM740902Courtesy of GENERAL MOTORS CORP.
  11. If replacing the IP harness on a TrailBlazer, Envoy or Bravada, remove the IP harness electrical connectors from the cellular communication Module. Refer to COMMUNICATION INTERFACE MODULE REPLACEMENT (TRAILBLAZER, ENVOY, BRAVADA) or COMMUNICATION INTERFACE MODULE REPLACEMENT (TRAILBLAZER EXT, ENVOY XL) in Cellular Communication.
  12. If replacing the IP harness on a TrailBlazer EXT or Envoy XL, disconnect the two inline IP wire harness electrical connectors from the body harness.
    Fig 2: Locating Inline IP Wire Harness Electrical Connectors
    GM828713Courtesy of GENERAL MOTORS CORP.
  13. Remove the HVAC support bracket from the IP substrate. Refer to Instrument Panel (I/P) Carrier Replacement .
  14. Disconnect the park brake electrical connector (2).
    Fig 3: Disconnecting/Connecting Park Brake & A/T Shift Interlock Electrical Connectors
    GM756021Courtesy of GENERAL MOTORS CORP.
  15. Disconnect the automatic transmission shift interlock electrical connector (1).
  16. Disconnect the sensing diagnostic module (SDM) electrical connectors.
  17. Disconnect the 10-way in line electrical connector located near the SDM.
  18. Disconnect the 4-way in line electrical connector located near the SDM.
    19. Fig 4: Disconnecting/Connecting HVAC Evaporator Blower Motor Resister Pack Electrical Connectors
    GM740910Courtesy of GENERAL MOTORS CORP.
  19. Disconnect the electrical connector (3) from the HVAC evaporator blower motor resister pack.
  20. Disconnect the electrical connector (2) from the passenger temperature valve.
  21. If equipped, release the rosebud that retains the theft deterrent shock sensor to the IP support bracket.
  22. Disconnect the SIR electrical connector (1).
  23. Remove the splice pack retaining bolt located at the front of the shift lever bracket.
  24. Disconnect the headliner harness electrical connector (1) and diversity antenna coax cable connector (2) located near the HVAC evaporator blower motor.
    Fig 5: View Of Radio Antenna Cable To Radio Extension Cable
    GM734416Courtesy of GENERAL MOTORS CORP.
  25. Disconnect the electrical connectors (1) from the discharge air temperature sensors.
    Fig 6: Disconnecting/Connecting Discharge Air Temperature Sensors Electrical Connectors
    GM740900Courtesy of GENERAL MOTORS CORP.
  26. Disconnect the electrical connector (2) from the auxiliary blower motor.
  27. Disconnect the electrical connector (2) from the accelerator pedal sensor.
    Fig 7: Disconnecting/Connecting Accelerator Pedal Sensor Electrical Connector
    GM740911Courtesy of GENERAL MOTORS CORP.
  28. Disconnect the electrical connector from the stop lamp switch (1).
  29. Remove the connector retaining bolt and disconnect the electrical connector (3) from the steering column.
  30. If equipped, disconnect the electrical connector from the clutch pedal switch.
    Fig 8: View Of Clutch Pedal Switch Electrical Connector
    GM740897Courtesy of GENERAL MOTORS CORP.
  31. Remove the bolts (1) that retain the IP wire harness to the left IP support bracket.
    Fig 9: Locating IP Wiring Harness To IP Support Brackets Mounting Bolts
    GM828710Courtesy of GENERAL MOTORS CORP.
  32. Disconnect the electrical connectors (1) from the transfer case shift control module, located near the left side of the steering wheel support bracket.
    Fig 10: Disconnecting/Connecting Transfer Case Shift Control Module Electrical Connectors
    GM740898Courtesy of GENERAL MOTORS CORP.
  33. Partially remove the HVAC module assembly in order to gain access to the remaining electrical connectors. Refer to HVAC MODULE ASSEMBLY REPLACEMENT in Heating Ventilation and Air Conditioning.
  34. Disconnect the electrical connector (1) from the HVAC discharge air temperature sensor.
    Fig 11: Disconnecting/Connecting HVAC Discharge Air Temperature Sensor Electrical Connectors
    GM740904Courtesy of GENERAL MOTORS CORP.
  35. Disconnect the air inlet electrical connector (2) from the HVAC actuator.
  36. Disconnect the defroster (4), air conditioning (3), and driver's side temperature valve (2) electrical connectors from the HVAC actuators.
  37. Disconnect the discharge air temperature electrical connector (1) from the HVAC actuator.
    Fig 12: Disconnecting/Connecting Discharge Air Temperature Electrical Connector
    GM740906Courtesy of GENERAL MOTORS CORP.
  38. Open the hood.
  39. Remove the air inlet grille in order to gain access to the windshield wiper motor. Refer to AIR INLET GRILLE PANEL REPLACEMENT (ENVOY, TRAILBLAZER) .
  40. Remove the IP harness retaining clip from the plenum weld stud.
  41. Disconnect the IP harness electrical connector (2) from the windshield wiper motor.
    Fig 13: Disconnecting/Connecting Windshield Wiper Motor & Underhood Lamp Electrical Connectors
    GM740912Courtesy of GENERAL MOTORS CORP.
  42. Remove the clip that retains the IP harness to the hood hinge.
  43. Disconnect the IP harness electrical connector (1) from the underhood lamp harness.
  44. Disconnect the IP harness inline electrical connector (1) from the forward lamp harness.
  45. Disconnect the battery positive cable terminal (2) from the underhood junction block.
    Fig 14: Disconnecting/Connecting Underhood Junction Block Base Electrical Connectors
    GM740915Courtesy of GENERAL MOTORS CORP.
  46. Disconnect the 2 IP harness two-way electrical connectors (3) from the underhood junction block base.
  47. Disconnect the IP harness inline electrical connector from the chassis inline wiring harness.
    Fig 15: Identifying Chassis Inline Wiring Harness
    GM740916Courtesy of GENERAL MOTORS CORP.
  48. Remove the grounding nut (3) that retains the ground terminal to the hood.
    Fig 16: Removing/Installing Ground Terminal Retaining Nuts
    GM740913Courtesy of GENERAL MOTORS CORP.
  49. Remove the grounding nut (2) that retains the ground terminals to the front fender.
  50. Remove the grounding nut that retains the ground terminals to the weld stud located on the front plenum.
  51. Disconnect the IP harness electrical connector (2) from the powertrain control module.
    Fig 17: Disconnecting/Connecting Power Control Module IP Harness Electrical Connector
    GM740918Courtesy of GENERAL MOTORS CORP.
  52. Disconnect the IP harness inline electrical connector (1) from the engine harness inline electrical connector.
  53. Remove the IP harness grommet from the bulkhead.
  54. Pass the exterior portion of the IP harness through the bulkhead.
  55. Remove the IP harness from the vehicle.
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