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Home >> Hummer >> 2008 >> H2 4D Utility Wagon >> Repair and Diagnosis >> External Pages >> Different car >> Section 212 (Hybrid Engine Electrical System) >> Repair Instructions >> Battery Negative Cable Disconnection & Connection >> Disconnect Procedure

Disconnect Procedure

WARNING: This page is about a different car, the 2008 GMC Yukon and 2008 Chevrolet Tahoe. However, it is still accessible from the selected car via links, so may be relevant.
CAUTION: Refer to Battery Disconnect Caution .
IMPORTANT: Do NOT disconnect the negative battery cable from the battery until a period of at least 1 minute after performing the following: Turning the ignition to OFF, without pausing at ACCESSORY, and without applying the brake pedal. These steps are necessary to allow the brake system pressure relief procedure to occur. Failure to follow these steps may result in warning lamps and/or DTCs being set pertaining to interruption of the pressure relief procedure. Other vehicle systems may also be affected by not allowing a 1 minute duration for power-down.
    Fig 1: Locating Battery Components
    GM1968005Courtesy of GENERAL MOTORS CORP.
  1. Turn off all lamps and accessories.
  2. Turn the ignition OFF without pausing at ACCESSORY, and remove the ignition key.
  3. Wait for at least 1 minute before disconnecting the negative battery cable from the battery, to allow for proper power-down procedures of certain vehicle systems.
  4. Reposition the negative battery cable insulating cover (5) from the negative battery terminal.
  5. Rotate the lever lock (4) counterclockwise in order to disconnect the negative battery cable from the battery.
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