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Home >> Chevrolet >> 2002 >> Blazer 4D Utility, 4WD, Part Time >> Repair and Diagnosis >> External Pages >> Different car >> Section 1967 (Hybrid Energy Storage System - 2.4L (Hp7)) >> Repair Instructions >> 175 Amp Mega Fuse Replacement >> Removal Procedure

Removal Procedure

WARNING: This page is about a different car, the 2009 Saturn Vue. However, it is still accessible from the selected car via links, so may be relevant.
    Fig 1: Battery Positive Cable Jumper Block, & ECM & TCM Electrical Connectors
    GM1998156Courtesy of GENERAL MOTORS CORP.
  1. Disconnect the hybrid battery. Refer to Hybrid Battery Service Disconnect/Connect .
  2. Unclip the battery positive cable jumper block (1) from the engine control module (ECM) bracket (4).
  3. Disconnect the ECM electrical connectors (2) and the transmission control module (TCM) electrical connector (3).
    4. Fig 2: ECM Bracket
    GM1998167Courtesy of GENERAL MOTORS CORP.
  4. Remove the ECM bracket bolts (1), nuts (2) and ECM bracket (3).
    5. Fig 3: Generator Control Module Cover Bolts And Cover
    GM1998181Courtesy of GENERAL MOTORS CORP.
  5. Remove the generator control module cover bolts (1) and cover (2).
    6. Fig 4: Positive And Ground Terminal
    GM1998192Courtesy of GENERAL MOTORS CORP.
    WARNING: To help avoid personal injury, additional precautions must be taken prior to working on the generator control module or the generator starter. After removing the 36V battery cables from the generator battery, remove both engine wiring harness connectors from the generator control module. Wait at least 5 minutes and then remove the generator control module cover. Verify voltage levels at all 36V, 12V, and 3-phase connections, are less than 3 volts using a DMM before proceeding.
  6. Check the generator control module for voltage potential, in order to ensure that the module has been disabled.
    1. Measure from the 36-volt positive terminal (3) to a known good chassis ground. The voltage should be less than 3 volts.
    2. Measure from the 12-volt positive terminal (4) to a known good chassis ground. The voltage should be less than 3 volts.
    3. Measure from the ground terminal (2) to a known good chassis ground, checking for continuity.
    7. WARNING: To help avoid personal injury, always treat the 3-phase cable and connectors as if voltage is present and as if the surface of all parts of the cable is hot.
  7. Verify that the generator control module 3-phase cables are disabled.
    1. Measure from each phase 1, 2 and 3 connection (1) to a known good chassis ground. The voltage should be less than 3 volts.
    2. After verifying that there is no voltage present, the generator control module 3-phase cables can now be removed from the generator control module.
    3. If 3 volts or more are present, repeat the disconnect procedure. Refer to Hybrid Battery Service Disconnect/Connect .
    8. Fig 5: Battery Positive Cable Fuse Nuts And Bolt
    GM1998566Courtesy of GENERAL MOTORS CORP.
  8. Remove the battery positive cable fuse nuts (1) and bolt (2).
  9. Reposition the battery positive cable (3) and remove the 175 mega amp fuse (4).
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