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Home >> Chevrolet >> 2002 >> Blazer 4D Utility, 4WD, Part Time >> Repair and Diagnosis >> External Pages >> Different car >> Section 981 (Battery, Charging System & Starting System) >> Repair Instructions >> Hybrid Control Module (HCM) Replacement (5.3L Engine w/RPO HP2) >> Removal Procedure

Removal Procedure

WARNING: This page is about a different car, the 2004 GMC Sierra, 2004 GMC Cab & Chassis Sierra, 2004 Chevrolet Silverado, and 2004 Chevrolet Cab & Chassis Silverado. However, it is still accessible from the selected car via links, so may be relevant.
  1. Disconnect the energy storage box (ESB). Refer to Energy Storage Box (ESB) Service Disconnect/Connect (5.3L Engine w/RPO HP2) .
  2. Disconnect the hybrid control module (HCM) electrical connector.
    1. Push the center retainer in while sliding the gray lever forward.
    2. Slide the gray lever forward completely until it locks.
    3. Remove the electrical connector.
    3. Fig 1: View Of Hybrid Control Module Electrical Connector (5.3L Engine w/RPO HP2)
    GM1237059Courtesy of GENERAL MOTORS CORP.
  3. Open the hose clamp on top of the fan shroud.
  4. Remove the radiator hose from the clip.
  5. Remove the HCM bracket bolts (3, 4).
  6. Remove the HCM bracket (5) from the fan shroud.
    7. Fig 2: View Of HCM Bracket & Bolts (5.3L Engine w/RPO HP2)
    GM1206683Courtesy of GENERAL MOTORS CORP.
  7. Remove the HCM from the bracket.
    8. Fig 3: View Of HCM Bracket (5.3L Engine w/RPO HP2)
    GM1237051Courtesy of GENERAL MOTORS CORP.
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