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Home >> Chevrolet >> 2002 >> Blazer 4D Utility, 4WD, Part Time >> Repair and Diagnosis >> External Pages >> Different car >> Section 1845 (Hybrid Energy Storage System) >> Repair Instructions >> Hybrid Battery Service Disconnect/Connect >> Disconnect Procedure

Disconnect Procedure

WARNING: This page is about a different car, the 2007 Saturn Vue. However, it is still accessible from the selected car via links, so may be relevant.
CAUTION: To help avoid personal injury, always ensure the ignition switch is in the OFF position and the ignition key has been removed prior to working on any 36V components. After the key has been removed, disconnect the negative 12V battery cable and then open the generator battery disconnect control module cover. After waiting for at least 5 minutes, measure the voltage potential using a DMM between the following:
  1. 36V positive and negative battery cables
  2. 36V positive battery cable and vehicle ground
  3. 36V negative battery cable and vehicle ground

All measured voltage levels must be below 3 volts. After confirming that voltage levels are less than 3 volts, remove the 36V negative and then the positive battery cable.
    Fig 1: Locating Stowage Tray Retainers
    GM1831493Courtesy of GENERAL MOTORS CORP.
  1. Remove the ignition key from the ignition switch. Secure the ignition key in order to ensure that the key CANNOT be re-installed without your knowledge.
  2. Disconnect the 12-volt negative battery cable. Refer to Battery Negative Cable Disconnection and Connection (2.2L (L61) and 3.5L (L66)) or Battery Negative Cable Disconnection and Connection (2.4L (LAT)) .
  3. Remove the rear compartment closeout panel. Refer to Rear Compartment Closeout Panel Replacement .
  4. Remove the driver side rear compartment load floor stowage tray retainers (3).
  5. Remove the drive side rear compartment load floor stowage tray (4).
  6. Carefully remove the driver side foam insulator.
    7. Fig 2: Locating Generator Battery Disconnect Control Module Cover Bolt
    GM1832009Courtesy of GENERAL MOTORS CORP.
    CAUTION: To help avoid personal injury, be careful when working in the vicinity of the generator battery disconnect control module. Internal components will still be live, 36V potential, even when the cover has been opened or removed.
  7. Remove the generator battery disconnect control module cover bolt.
    8. Fig 3: View Of Cover
    GM1832010Courtesy of GENERAL MOTORS CORP.
  8. Slide to the right, and remove the generator battery disconnect control module cover.
  9. WAIT at least 5 minutes in order to allow the generator control module capacitors to discharge.
    10. Fig 4: Locating Studs
    GM1831442Courtesy of GENERAL MOTORS CORP.
    IMPORTANT: Never assume the battery pack is disabled when the generator battery disconnect control module cover is opened.
  10. The generator battery will have to be checked for voltage potential using a voltmeter first, verify that the voltmeter works:
    1. Set the voltmeter to DC voltage.
    2. Measure the vehicle's 12-volt battery voltage (at 12-volt positive jumper location and negative battery cable).
    3. The meter should read greater than +12 volts DC.
  11. Now, check the generator battery for voltage potential in order to ensure that the generator battery has been disabled.
    1. Measure from the positive (3) stud to the negative stud (2). The voltage should be less than 3 volts.
    2. Measure from the positive (3) stud to vehicle chassis ground (1). The voltage should be less than 3 volts.
    3. Measure from the negative (2) stud to vehicle chassis ground (1). The voltage should be less than 3 volts.
    4. After verifying that there is no voltage present, the 36-volt negative and positive battery cables can now be removed from the generator battery.
    12. Fig 5: Plastic Nut
    GM1831461Courtesy of GENERAL MOTORS CORP.
  12. Remove the plastic nut (1) from the 36-volt negative battery cable lead.
  13. Remove the 36-volt negative battery cable lead from the generator battery.
    14. Fig 6: Locating Battery Components
    GM1820195Courtesy of GENERAL MOTORS CORP.
  14. Remove the 36-volt positive battery cable lead nut (6).
  15. Remove the 36-volt positive battery cable lead (5).
  16. Secure the cables out of the way, ensuring that the cables CANNOT be re-installed without your knowledge.
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