GMC
2002–06 Envoy
PRECAUTIONS
Warning: Batteries produce explo-
sive gases, contain corrosive acid, and
supply levels of electrical current high
enough to cause burns. Therefore, to re-
duce the risk of personal injury when
working near a battery: Always shield
your eyes and avoid leaning over the
battery whenever possible; do not ex-
pose the battery to open flames or
sparks; do not allow the battery electro-
lyte to contact the eyes or the skin; flush
immediately and thoroughly any con-
tacted areas with water, and get medical
help.
Warning: Unless directed otherwise,
the ignition and start switch must be in
the OFF or LOCK position, and all elec-
trical loads must be OFF before servic-
ing any electrical component. Discon-
nect the battery ground cable to
prevent an electrical spark should a
tool or equipment come in contact with
an exposed electrical terminal. Failure
to follow these precautions may result
in personal injury and/or damage to the
vehicle or its components.
For vehicles equipped with OnStar®
(UE1) with Back Up Battery, the back up
battery is a redundant power supply to
allow limited OnStar® functionality in the
event of a main vehicle battery power dis-
ruption to the VCIM (OnStar® module).
Do not disconnect the main vehicle bat-
tery or remove the OnStar® fuse with the
ignition key in any position other than
OFF. Retained Accessory Power (RAP)
should be allowed to time out or be dis-
abled (simply opening the driver door
should disable RAP) before disconnecting
power. Disconnecting power to the
OnStar® module in any way while the
ignition is ON or with RAP activated may
cause activation of the OnStar® Back Up
Battery (BUB) system and will discharge
and permanently damage the BUB. Once
the BUB is activated, it will stay on until it
has completely discharged. The BUB is
not rechargeable and, once activated, the
BUB must be replaced.
BATTERY
Removal
1. Record radio anti-theft code and sta-
tion presets.
2. Turn off all lamps and accessories.
3. Turn ignition switch to OFF position.
4. Loosen battery ground cable bolt.
5. Disconnect battery ground cable (5)
from battery, Fig. 1.
6. Loosen battery positive cable bolt.
7. Disconnect battery positive cable (4)
from battery, Fig. 1.
8. Remove coolant heater cord retainers
(1) and heater cord from battery cover,
if equipped, Fig. 2.
9. Remove battery air duct from battery
cover, Fig. 3.
10. Remove battery tray brace bolts, nut
and brace, Fig. 4.
11. Remove battery cover from battery,
Fig. 5.
12. Remove battery hold down retainer
nut, washer and retainer, Fig. 6.
13. Remove battery from battery tray.
Installation
Clean any corrosion from the battery ca-
bles using a wire brush.
1. Install battery to battery tray.
2. Install battery hold down retainer, nut
and washer, Fig. 6. Torque nut to 11 ft.
lbs.
3. Install battery cover to battery, Fig. 5.
4. Install battery tray brace and bolts and
nut, Fig. 4. Torque bolts and nut to 89
inch lbs.
5. Install battery air duct to battery cover,
Fig. 3.
6. Install coolant heater cord and retain-
ers to battery cover, if equipped,
Fig. 2.
7. Connect battery positive cable (4) to
battery, Fig. 1. Torque cable bolt to 11
ft. lbs.
8. Connect battery ground cable (5) to
battery, Fig. 1. Torque cable bolt to 11
ft. lbs.
9. Reset all preset and theft codes previ-
ously recorded to radio.
BTY1200000000499
Fig. 1 Battery cable
disconnection
BTY1200000000500
Fig. 2 Coolant heater cord
removal
2002–06 ENVOY 1
