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Home >> Chevrolet >> 2002 >> Blazer 4D Utility, 4WD, Part Time >> Repair and Diagnosis >> External Pages >> Different car >> Section 1401 (Instrument Panel System Displays, Gauges And Console) >> Repair Instructions >> Instrument Panel (I/P) Harness Replacement >> Removal Procedure

Removal Procedure

WARNING: This page does not describe the selected car, but rather 6 other vehicles, including the 2004 Oldsmobile Bravada, 2004 GMC Envoy XUV, 2004 GMC Envoy XL, 2004 GMC Envoy, and 2004 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 SIR Disabling and Enabling Zone 3 and to SIR Disabling and Enabling Zone 5 in SIR.
  3. Remove the front seats. Refer to Seat Replacement - Front Bucket in Seats.
  4. If replacing the I/P 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 I/P harness on TrailBlazer EXT or Envoy XL, remove the second row seats. Refer to Seat Replacement - Rear No. 1 (TrailBlazer EXT, Envoy XL, Envoy XUV) in Seats
  6. Remove the center console. Refer to Console Replacement 
  7. Remove the instrument panel (I/P). Refer to Instrument Panel (I/P) Assembly Replacement .
  8. Fold the front portion of the rear carpet in order to reveal the I/P harness connected to the rear electrical center. Refer to Carpet Replacement - Rear (TrailBlazer, Envoy, Bravada) , Carpet Replacement - Rear (TrailBlazer EXT, Envoy XL) or Carpet Replacement - Rear (Envoy XUV) in Interior Trim.
  9. Remove the I/P harness from the rear electrical center. Refer to Rear Electrical Center or Junction Block Replacement in Wiring Systems.
    10. Fig 1: Identifying Inline I/P Harness To Body Wiring Harness Connection
    GM740902Courtesy of GENERAL MOTORS CORP.
  10. Disconnect the inline I/P harness electrical connectors from the body wiring harness electrical connector.
  11. If replacing the I/P harness on a TrailBlazer, Envoy or Bravada, remove the I/P 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. Fig 2: Identifying Inline I/P Wire Harness To Body Harness Electrical Connectors (TrailBlazer EXT or Envoy XL)
    GM828713Courtesy of GENERAL MOTORS CORP.
  12. If replacing the I/P harness on a TrailBlazer EXT or Envoy XL, disconnect the two inline I/P wire harness electrical connectors from the body harness.
  13. Remove the HVAC support bracket from the I/P substrate. Refer to Instrument Panel (I/P) Carrier Replacement .
    14. Fig 3: Identifying Park Brake Electrical Connector
    GM756021Courtesy of GENERAL MOTORS CORP.
  14. Disconnect the park brake electrical connector (2).
  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: Identifying HVAC Evaporator Blower Motor Resistor Pack Electrical Connector
    GM740910Courtesy of GENERAL MOTORS CORP.
  19. Disconnect the electrical connector (3) from the HVAC evaporator blower motor resistor 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 I/P 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. Fig 5: Identifying Discharge Air Temperature Sensors & Auxiliary Blower Motor Connectors
    GM740900Courtesy of GENERAL MOTORS CORP.
  24. Disconnect the electrical connectors (1) from the discharge air temperature sensors.
  25. Disconnect the electrical connector (2) from the auxiliary blower motor.
    26. Fig 6: Identifying Accelerator Pedal Sensor Electrical Connector
    GM740911Courtesy of GENERAL MOTORS CORP.
  26. Disconnect the electrical connector (2) from the accelerator pedal sensor.
  27. Disconnect the electrical connector from the stop lamp switch (1).
  28. Remove the connector retaining bolt and disconnect the electrical connector (3) from the steering column.
    29. Fig 7: Identifying Clutch Pedal Switch
    GM740897Courtesy of GENERAL MOTORS CORP.
  29. If equipped, disconnect the electrical connector from the clutch pedal switch.
    30. Fig 8: Removing/Installing IP Wiring Harness Retaining Screws From IP Support Brackets
    GM828710Courtesy of GENERAL MOTORS CORP.
  30. Remove the bolts (1) that retain the I/P wire harness to the left I/P support bracket.
    31. Fig 9: Identifying Transfer Case Shift Control Module Electrical Connectors
    GM740898Courtesy of GENERAL MOTORS CORP.
  31. Disconnect the electrical connectors (1) from the transfer case shift control module, located near the left side of the steering wheel support bracket.
  32. 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.
    33. Fig 10: Identifying HVAC Discharge Air Temperature Sensor & HVAC Actuator Air Inlet Electrical Connectors
    GM740904Courtesy of GENERAL MOTORS CORP.
  33. Disconnect the electrical connector (1) from the HVAC discharge air temperature sensor.
  34. Disconnect the air inlet electrical connector (2) from the HVAC actuator.
    35. Fig 11: Identifying Defroster, Air Conditioning, & Driver's Side Temperature Valve Electrical Connectors
    GM740906Courtesy of GENERAL MOTORS CORP.
  35. Disconnect the defroster (4), air conditioning (3), and driver's side temperature valve (2) electrical connectors from the HVAC actuators.
  36. Disconnect the discharge air temperature electrical connector (1) from the HVAC actuator.
  37. Open the hood.
  38. Remove the air inlet grille in order to gain access to the windshield wiper motor. Refer to Air Inlet Grille Panel Replacement (Envoy, TrailBlazer) or Air Inlet Grille Panel Replacement (Rainier) in Wipers/Washer Systems.
    39. Fig 12: Identifying Windshield Wiper Motor Electrical Connector
    GM865716Courtesy of GENERAL MOTORS CORP.
  39. Remove the I/P harness retaining clip from the plenum weld stud.
  40. Disconnect the I/P harness electrical connector (1) from the windshield wiper motor.
    41. Fig 13: Identifying I/P Harness Inline Electrical Connector, Battery Positive Cable Terminal & Underhood Junction Block I/P Harness Two-Way Electrical Connectors
    GM740915Courtesy of GENERAL MOTORS CORP.
  41. Disconnect the I/P harness inline electrical connector (1) from the forward lamp harness.
  42. Disconnect the battery positive cable terminal (2) from the underhood junction block.
  43. Disconnect the 2 I/P harness two-way electrical connectors (3) from the underhood junction block base.
    44. Fig 14: Identifying I/P Harness Inline Electrical Connector
    GM740916Courtesy of GENERAL MOTORS CORP.
  44. Disconnect the I/P harness inline electrical connector from the chassis inline wiring harness.
    45. Fig 15: Identifying Ground Terminals
    GM865717Courtesy of GENERAL MOTORS CORP.
  45. Remove the ground terminals (2) from the front fender.
  46. Remove the nut (1) that retains the ground terminals to the weld stud located on the front plenum.
    47. Fig 16: Identifying Powertrain Control Module Electrical Connector
    GM740918Courtesy of GENERAL MOTORS CORP.
  47. Disconnect the I/P harness electrical connector (2) from the powertrain control module.
  48. Disconnect the I/P harness inline electrical connector (1) from the engine harness inline electrical connector.
  49. Remove the I/P harness grommet from the bulkhead.
  50. Pass the exterior portion of the I/P harness through the bulkhead.
  51. Remove the I/P harness from the vehicle.
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