Instrument Panel (I/P) Harness Replacement

Instrument Panel (I/P) Harness Replacement

Removal Procedure

Caution: Refer to Battery Disconnect Caution in Service Precautions.

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.
4. If replacing the I/P harness on a TrailBlazer, Envoy or Bravada, remove the rear seat cushions.
5. If replacing the I/P harness on TrailBlazer EXT or Envoy XL, remove the second row seats.
6. Remove the center console.
7. Remove the instrument panel (I/P).
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) Carpet Replacement - Rear (Envoy XUV) in Interior Trim.
9. Remove the I/P harness from the rear electrical center.




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.




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.




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. 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 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. Disconnect the electrical connectors (1) from the discharge air temperature sensors.
25. Disconnect the electrical connector (2) from the auxiliary blower motor.




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. If equipped, disconnect the electrical connector from the clutch pedal switch.




30. Remove the bolts (1) that retain the I/P wire harness to the left I/P support bracket.




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. 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. 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.




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. 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. Disconnect the I/P harness inline electrical connector from the chassis inline wiring harness.




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. 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.

Installation Procedure




1. Position the I/P harness to the vehicle.
2. Pass the exterior portion of the I/P harness through the bulkhead.
3. Install the I/P harness grommet to the bulkhead.
4. Connect the I/P harness inline electrical connector (1) to the engine harness inline electrical connector.
5. Connect the I/P harness electrical connector (2) to the powertrain control module.





Notice: Refer to Fastener Notice in Service Precautions.

6. Install the grounding nut (1) that retains the ground terminals to the weld stud located on the front plenum.

Tighten the nut to 10 N.m (88 lb in).

7. Install the grounding bolt (2) that retains the ground terminals to the front fender.

Tighten the bolt to 10 N.m (88 lb in).




8. Connect the I/P harness inline electrical connector to the chassis inline wiring harness.




9. Connect the 2 two-way I/P harness electrical connectors (3) to the underhood junction block base.
10. Connect the battery positive cable terminal (2) to the underhood junction block.
11. Install the battery cable terminal nut.

Tighten the nut to 10 N.m (88 lb in).

12. Connect the I/P harness in line electrical connector (1) to the forward lamp harness.




13. Connect the I/P harness electrical connector (1) to the windshield wiper motor.
14. Install the I/P harness retaining clip to the plenum weld stud.
15. Install the air inlet grille.
16. Close the hood.
17. Install the HVAC module assembly to the vehicle.




18. Connect the discharge air temperature electrical connector (1) to the HVAC actuator.
19. Connect the defroster (4), air conditioning (3), and drivers side temperature valve (2) electrical connectors to the HVAC actuators.




20. Connect the air inlet electrical connector to the HVAC actuator.
21. Connect the electrical connector (1) to the HVAC discharge air temperature sensor.




22. Connect the electrical connectors (1) to the transfer case shift control module, located near the left side of the steering wheel support bracket.




23. Install the bolts (1) that retain the I/P wire harness to the I/P support bracket.

Tighten the bolts to 2.5 N.m (22 lb in).




24. If equipped, connect the electrical connector to the clutch pedal switch.




25. Connect the electrical connector (3) to the steering column.
26. Install the steering column electrical connector bolt.

Tighten the bolt to 6 N.m (53 lb in).

27. Connect the electrical connector to the stop lamp switch (1).
28. Connect the electrical connector (2) to the accelerator pedal sensor.




29. Connect the electrical connector (2) to the floor auxiliary blower motor.
30. Connect the electrical connectors (1) to the discharge air temperature sensors.
31. Install the splice pack retaining bolt located at the front of the shift lever bracket.

Tighten the bolt to 10 N.m (88 lb in).




32. Connect the 4-way in line electrical connector located near the SDM.
33. Connect the 10-way in line electrical connector located near the SDM.
34. Connect the SDM electrical connectors.
35. Connect the park brake electrical connector (2).
36. Connect the automatic transmission shift interlock electrical connector (1).
37. Connect the SIR electrical connector (1).
38. Attach the rosebud that retains the theft deterrent shock sensor to the I/P support bracket, if equipped.
39. Connect the electrical connector (2) to the passenger temperature valve.




40. Connect the electrical connector (3) to the HVAC evaporator blower motor resister pack.
41. Install the HVAC support bracket to the I/P substrate.
42. If replacing the I/P harness on a TrailBlazer, Envoy or Bravada, install the I/P harness electrical connectors to the cellular communication module.




43. Connect the inline body electrical connector from the body wiring harness electrical connector.




44. If replacing the I/P harness on a TrailBlazer EXT or Envoy XL, connect the two inline I/P wire harness electrical connectors to the body harness.
45. Pass the I/P wire harnesses through the rear carpet in order to install the I/P harness to the rear electrical center.
46. Install the rear carpet.
47. Install the I/P harness to the rear electrical center.
48. Install the I/P.
49. Install the center console.
50. If replacing the I/P harness on a TrailBlazer, Envoy or Bravada, install the rear seat cushions.
51. If replacing the I/P harness on TrailBlazer EXT or Envoy XL, install the second row seats.
52. Install the front seats.
53. Enable the SIR. Refer to SIR Disabling and Enabling Zone 3 and to SIR Disabling and Enabling Zone 5 in SIR.
54. Connect the negative battery cable.