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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 >> Energy Storage Box (ESB) Internal Signal Harness 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. Remove the energy storage box (ESB) intermediate cover. Refer to Energy Storage Box (ESB) Trim Cover Replacement (5.3L Engine w/RPO HP2) .
  2. Note the routing of the internal signal harness for ease of reassembly.
  3. Disconnect the battery resistor electrical connectors.
  4. Disconnect the battery temperature sensor electrical connectors.
  5. Remove the energy storage control module (ESCM). Refer to Energy Storage Control Module Replacement (5.3L Engine w/RPO HP2) .
  6. Disconnect the ESB fan electrical connectors.
  7. Disconnect the battery cut-off switch electrical connector.
  8. Disconnect the high current sensor electrical connector.
  9. Remove the ground wire screw.
  10. Disengage the retainers (1, 2) securing the harness.
    11. Fig 1: View Of ESB Internal Signal Harness & Retainers (5.3L Engine w/RPO HP2)
    GM1335918Courtesy of GENERAL MOTORS CORP.
  11. Remove the internal signal harness from the ESB.
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