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Do not use the acceleratorpedal, and be ready to turn offthe engine immediately if itstarts.
3. For automatic transmissionvehicles, try to start the enginein each gear. The vehicleshould start only in P (Park) orN(Neutral). If the vehicle startsin any other position, contactyour dealer for service.
For manual transmissionvehicles, put the shift lever inNeutral, push the clutch pedaldown halfway, and try to startthe engine. The vehicle shouldstart only when the clutchpedal is pushed down all theway to the floor. If the vehiclestarts when the clutch pedal isnot pushed all the way down,contact your dealer for service.
Automatic Transmission
Shift Lock Control
Function Check
{Warning
When you are doing this
inspection, the vehicle could
move suddenly. If the vehicle
moves, you or others could be
injured.
1. Before starting this check, besure there is enough roomaround the vehicle. It should beparked on a level surface.
2. Apply the parking brake. Beready to apply the regularbrake immediately if the vehiclebegins to move.
3. With the engine off, turn theignition on, but do not start theengine. Without applying theregular brake, try to move theshift lever out of P (Park) withnormal effort. If the shift levermoves out of P (Park), contactyour dealer for service.
Ignition Transmission
Lock Check
While parked, and with the parkingbrake set, try to turn the ignition toLOCK/OFF in each shift leverposition.
.For automatic transmissionvehicles, the ignition should turnto LOCK/OFF only when theshift lever is in P (Park).
.For manual transmissionvehicles, the ignition should turnto LOCK/OFF only when youpress the key release button.
On all vehicles, the ignition keyshould come out only in LOCK/OFF.
Contact your dealer if service isrequired.
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Park Brake and P (Park)
Mechanism Check
{Warning
When you are doing this check,
the vehicle could begin to move.
Yo u o r o t h e r s c o u l d b e i n j u r e d
and property could be damaged.
Make sure there is room in front
of the vehicle in case it begins to
roll. Be ready to apply the regular
brake at once should the vehicle
begin to move.
Park on a fairly steep hill, with thevehicle facing downhill. Keepingyour foot on the regular brake, setthe parking brake.
.To c h e c k t h e p a r k i n g b r a k e ' sholding ability: With the enginerunning and the transmission inN(Neutral), slowly remove footpressure from the regular brakepedal. Do this until the vehicle isheld by the parking brake only.
.To c h e c k t h e P ( P a r k )mechanism's holding ability:With the engine running, shift toP(Park). Then release theparking brake followed by theregular brake.
Contact your dealer if service isrequired.
Wiper Blade Replacement
Windshield wiper blades should beinspected for wear or cracking.
Replacement blades come indifferent types and are removed indifferent ways. For properwindshield wiper blade length andtype, seeMaintenanceReplacement Parts0377.
Caution
Allowing the wiper arm to touch
the windshield when no wiper
blade is installed could damage
the windshield. Any damage that
occurs would not be covered by
(Continued)
Caution (Continued)
the vehicle warranty. Do not allow
the wiper arm to touch the
windshield.
To r e p l a c e t h e w i n d s h i e l d w i p e rblade:
1. Pull the windshield wiperassembly away from thewindshield.
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2. Press the button (2) in themiddle of the wiper armconnector, and pull the wiperblade away from the armconnector (1).
3. Remove the wiper blade.
4. Reverse Steps 1–3forwiperblade replacement.
Headlamp Aiming
Headlamp aim has been preset andshould need no further adjustment.
If the vehicle is damaged in a crash,the headlamp aim may be affected.If adjustment to the headlamps isnecessary, see your dealer.
Bulb Replacement
For the proper type of replacementbulbs, seeReplacementBulbs0309.
For any bulb-changing procedurenot listed in this section, contactyour dealer.
Halogen Bulbs
{Warning
Halogen bulbs have pressurized
gas inside and can burst if you
drop or scratch the bulb. You or
others could be injured. Be sure
to read and follow the instructions
on the bulb package.
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Headlamps, Front Turn
Signal, Sidemarker, and
Parking Lamps
Driver Side
1. Low-Beam Headlamp
2. High-Beam Headlamp
3. Front Turn Signal/Sidemarker/Parking Lamp
See your dealer for passenger sidereplacement.
Headlamp
1. Open the hood.
2. Remove the headlamp bulbcover by turning itcounterclockwise.
3. Turn the bulb socketcounterclockwise to remove itfrom the headlamp assemblyand pull it straight out.
4. Unplug the electrical connectorfrom the old bulb by releasingthe clip on the bulb socket.
Turn Signal/Sidemarker/
Parking Lamp
1. Open the hood.
2. Turn the bulb socketcounterclockwise to remove itfrom the headlamp assemblyand pull it straight out.
3. Remove the bulb by pulling itstraight out of the bulb socket.
Taillamps, Turn Signal,
Stoplamps, and Back-Up
Lamps
1. Open the tailgate.
2. Remove the two rear lampassembly screws.
3. Pull the rear lamp assemblyoutboard away from the boxside until the retainers release.There will be a noise when theretainers release.
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4. Pull the rear lamp assemblystraight back to remove it fromthe vehicle.
5. Turn the bulb socketcounterclockwise.
6. Pull the bulb straight out fromthe socket.
7. Replace the bulb, then insertthe bulb socket into the rearlamp assembly and turnclockwise.
9. Verify the retainer ring is in theproper position. If the retainerring is out of position, it will notengage. Reset the retainer bypulling it forward with a tool.
10. Push the rear lamp assemblystraight in until it is seatedagainst the vehicle.
11 . M a k e s u r e t h e r e a r l a m passembly is flush with thebox side.
12. Reinstall the two rear lampassembly screws.
Center High-Mounted
Stoplamp (CHMSL) and
Cargo Lamp
1. Cargo Lamp Bulbs
2. Center High-MountedStoplamp (CHMSL) Bulb
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To r e p l a c e o n e o f t h e s e b u l b s :
1. Remove the two screws and liftoff the lamp assembly.
2. Turn the bulb socketcounterclockwise and pull itstraight out.
3. Pull the bulb straight out fromthe socket.
Replacement Bulbs
Exterior Lamp BulbNumber
Back-up Lamp 921 (W16W)
Back-up Lamp* 1156
Exterior Lamp BulbNumber
Cargo Lamp 921 (W16W)
CenterHigh-MountedStoplamp(CHMSL)
921LL
Front Turn SignalLamp andParking Lamp
7444NA-T
Sidemarker Lamp W5W LL
High-BeamHeadlamp9005 LL
Low-BeamHeadlampH11 LL
Stoplamp/Taillamp/Turn Signal Lamp7443 W21/5W LL-T
Stoplamp/TurnSignal Lamp/Ta i l l a m p *
11 5 7
*ChassisCabModels
For replacement bulbs not listedhere, contact your dealer.
Electrical System
Electrical System
Overload
The vehicle has fuses to protectagainst an electrical systemoverload. Fuses also protect powerdevices in the vehicle.
Replace a bad fuse with a new oneof the identical size and rating.
If there is a problem on the road andafuseneedstobereplaced,thereis a fuse puller in the EngineCompartment Fuse Block. Replacethe fuse as soon as possible withone of the same amperage rating.
Headlamp Wiring
An electrical overload may causethe lamps to go on and off, or insome cases to remain off. Have theheadlamp wiring checked right awayif the lamps go on and off orremain off.
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Windshield Wipers
If the wiper motor overheats due toheavy snow or ice, the windshieldwipers will stop until the motor coolsand will then restart.
Although the circuit is protectedfrom electrical overload, overloaddue to heavy snow or ice maycause wiper linkage damage.Always clear ice and heavy snowfrom the windshield before using thewindshield wipers.
If the overload is caused by anelectrical problem and not snow orice, be sure to get it fixed.
Fuses
The wiring circuits in the vehicle areprotected from short circuits byfuses. This greatly reduces thechance of fires caused by electricalproblems.
Look at the silver-colored bandinside the fuse. If the band is brokenor melted, replace the fuse. Be sureyou replace a bad fuse with a newone of the identical size and rating.
If a fuse goes out, replace the fuseas soon as you can.
Engine Compartment
Fuse Block
If the vehicle has a diesel engine,see the Duramax dieselsupplement.
The engine compartment fuse blockis in the engine compartment, onthe driver side of the vehicle.
Lift the cover to access the fuseblock.
Caution
Spilling liquid on any electrical
component on the vehicle may
damage it. Always keep the
covers on any electrical
component.
Afusepullerisavailableinsidethisfuse block.
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