How to Change the Battery in Pontiac Cars

by Contributing Writer; Updated June 12, 2017

The system retains a residual charge once the main battery is disconnected in order to preserve the OnStar functionality if main battery power is lost during an accident. Discharge this reserve power by opening the driver door with the ignition switch in the "Off" position. Failure to do so will cause the OnStar to activate and discharge its backup battery. Once activated, the OnStar cannot be deactivated and it will deplete the backup, making it necessary to replace the backup battery since it cannot be recharged. Before you disconnect the battery, make note of your radio presets and radio security code if applicable.

Under The Hood:

 How to Change the Battery in a 2000 Pontiac Montana

Open the hood of the 2000 Pontiac Montana after removing the keys from the ignition (if applicable).

Remove the two lower retaining bolts of the passenger-side cross brace on the front radiator frame rail, using the ratchet and a socket. Remove the upper retaining bolt of the cross brace near the passenger-side firewall with a wrench. Remove the cross brace.

Remove the black negative terminal bolt from the side post battery using a hand wrench. Remove the red cap (if applicable) from the positive battery terminal and remove the terminal bolt with the wrench.

Remove the battery hold-down wedge bolt with the ratchet, extension and socket. Remove the bolt and hold down wedge.

Tilt the battery slightly toward the center of the engine and place one hand underneath the left side of the battery and the other hand on the right top. Lift the battery out of the engine compartment.

Install the replacement battery into the engine compartment by reversing Step 5.

Replace the hold-down wedge and retaining bolt and tighten the bolt.

Connect the positive terminal bolt to the battery and hand-thread it into the side post. Tighten the bolt snugly with the wrench.

Connect the negative terminal bolt in the same way as the positive terminal bolt in Step 8.

Start the engine to test the operation of the battery before replacing the cross brace and retaining bolts.

Items you will need

  • Wrench set

  • Ratchet, 10-inch extension and socket set

  • Replacement battery

 How to Change a Battery in a Pontiac G6

Make a note of your radio presets, turn off all lights and accessories, then turn the ignition off. Disengage the clips holding the battery cover and remove the cover.

Loosen the negative battery terminal bolt and remove the negative cable. Route the cable aside so it doesn't touch the battery post. Loosen the positive battery terminal bolt and remove the positive cable.

Find the battery hold-down retainer on the inboard side of the battery. Remove the retainer bolt and the retainer. Lift the battery out of the engine compartment -- take care not to tip the battery much as you remove it.

Clean the battery terminals and posts with a battery terminal and post cleaner. Set the new battery in the battery tray. Install the retainer and tighten the bolt to 18 foot-pounds.

Install the positive terminal and tighten the bolt, then install the negative terminal and tighten the bolt. Torque both bolts to 13 foot-pounds.

Set the battery cover in place. Engage the cover tab nearest the strut tower first, the tab nearest the engine second and the tab next to the powertrain control module last.

Start the G6 and let it idle while you reprogram your radio presets and set the clock. Drive the car for at least 10 miles in city traffic and on the highway to allow the computer to relearn its adaptive strategy systems.

Items you will need

  • Ratchet

  • Socket set

  • Battery terminal and post cleaner

  • Torque wrench

 How to Replace the Battery in a Pontiac Remote Control

Insert a small knife or thin flat-head screwdriver between the remote halves, directly underneath the slot for your key ring.

Pry the remote halves apart carefully. Set them down on a table, and then remove the old battery from the remote.

Insert the new battery, with the "positive" symbol facing up. Align the remote halves and press them together to snap the remote back together.

Items you will need

  • Small knife or flat-head screwdriver

  • Replacement battery

 How to Replace the Battery in a 2003 Pontiac Montana

Locate and remove the bolt holding the under hood fuse box in place using a socket and ratchet. It is located on the radiator support directly behind the passenger’s side headlight assembly. Lift the fuse box and set it of the way.

Locate the black tubular brace that runs from the passenger’s side firewall to the passenger’s side of the radiator support. Remove the two bolts on the radiator support end of the bar with a socket and ratchet then swing it back toward the engine.

Locate the battery on the passenger’s side of the engine compartment and remove both battery cables with a wrench, starting with the negative cable first. Lay the wires aside.

Remove the retaining bolt from the plastic clamp near the base of the battery. You will need an extension, socket and ratchet to remove this bolt. Lift the plastic clamp out of the engine compartment the lift and remove the battery from the van.

Position a new battery on the tray in the engine compartment. Make sure you are using the same type and size of battery as the original or it may not fit in the space provided. Place the plastic clamp in place, insert the retaining bolt and tighten it with a socket, ratchet and extension.

Connect the positive battery cable to the battery terminal and tighten the retaining bolt with a wrench. Connect the negative battery cable to the negative battery terminal and tighten the retaining bolt with a wrench as well.

Pull the black, tubular brace back into position and install the two bolts that secure it to the radiator support. Tighten the two bolts with a socket and ratchet. Position the under hood fuse box over the battery and inset the mounting bolt that holds it to the radiator support. Tighten the bolt with a socket and ratchet.

Items you will need

  • Wrench set

  • Socket set

  • Ratchet

  • Ratchet extension

 How to Replace a Battery in a 2000 Pontiac Bonneville

Open the rear door of the Bonneville. Grab the front of the seat cushion of the rear seat. Lift the front of the seat cushion up to free the cushion from the retaining hooks.

Pull the cushion up and out of the rear seat area to expose the battery.

Disconnect the negative battery cable using a wrench. Repeat the process on the positive battery cable.

Remove the bolt from the retaining strap with a socket and ratchet. Lift the battery out of the tray. Insert the new battery and secure the retaining strap. Tighten the strap with a socket and ratchet.

Connect the positive battery cable and tighten it with a wrench. Repeat the process on the negative battery cable.

Thread the rear seat belts through the slots on the rear seat cushion. Insert the rear of the cushion under the seat back, hooking the loops into the metal guides in the seat. Push the front of the seat into place until it locks.

Items you will need

  • Wrench set

  • Socket and ratchet set

 How to Replace the Battery in a Pontiac Grand Am

Turn all of the vehicle accessories off. Turn the ignition switch to the "Off" position and remove the key. Open the driver's door to discharge the residual power, then pop the hood and close the door.

Locate the battery at the driver-side front of the engine compartment. Using a ratchet and socket, loosen and remove the negative terminal bolt, and disconnect the cable from the battery. Lay the cable aside to avoid accidental contact with the battery.

Remove the positive terminal bolt. Using a ratchet and socket, remove the battery retainer bolt and retainer. Lift the battery up and out of the battery tray. Be mindful of the angle on the battery as you move it clear of the body member that passes over the corner of the battery.

Lower the new battery into position on the battery tray, and again be aware of the angle on the battery. Install the battery retainer and retainer bolt, then tighten it securely. Clean the battery cable terminals as necessary, using a wire brush to remove any corrosion that may prevent a good connection during reassembly.

Install the positive cable and terminal bolt on the positive battery terminal. Using a foot-pound torque wrench and socket, tighten the terminal bolt to 11 foot-pounds. Exercise caution while tightening the terminal bolts to avoid over-tightening the bolt and causing permanent damage to the internal threads of the battery.

Install the negative battery cable and terminal bolt on the negative battery terminal, and tighten the bolt to 11 foot-pounds.

Items you will need

  • Ratchet

  • Socket set

  • Wire brush

  • Torque wrench