ignition CHEVROLET IMPALA 2003 8.G Repair Manual

Underhood Fuse Block (Lower)
Some fuses are in a fuse block in the engine
compartment on the passenger's side of the vehicle.
See
Engine Compartment Overview on page 5-12for more information on location.
Relays Usage
FAN CONT #3Secondary Cooling Fan
(Passenger's Side)
FAN CONT #2 Cooling Fan Control Relay
FAN CONT #1 Primary Cooling fan (Driver's Side)
IGN RELAY Ignition Relay
A/C CMPR HVAC Compressor
5-101

Fuses Usage
IGN SW Ignition Switch
RT I/P #3 Rear Defogger, Audio System
U/HOOD #2 Ignition Relay, AIR Pump
COOLING
FANSCooling Fans (Battery)
FAN CONT #2
Cooling Fan Control Relays #2 & #3
FAN CONT #1 Cooling Fan Control Relays #1
AIR PMP RLYAir Induction Reaction Pump Relay
(Battery)Fuses Usage
FUEL INJ Fuel Injectors
TRANS SOL Transmission Solenoids
A/C RLY
(COIL)HVAC Control Relay
ENG DEVICESCanister Purge Solenoid, Mass Air
Flow Sensor (MAF), AIR Pump
Relay & Valve Control
DFI MDL Direct Fire Ignition Module
OXY SENOxygen Sensor (Pre and Post
Converter)
5-102

Ignition Transaxle Lock Check
While parked, and with the parking brake set, try to turn
the ignition key to OFF in each shift lever position.
·The key should turn to OFF only when the shift lever
is in PARK (P).
·The key should come out only in OFF.
Parking Brake and Automatic Transaxle
Park (P) Mechanism Check
{CAUTION:
When you are doing this check, your vehicle
could begin to move. You or others could be
injured and property could be damaged. Make
sure there is room in front of your 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 the vehicle facing
downhill. Keeping your foot on the regular brake, set the
parking brake.
·To check the parking brake's holding ability: With
the engine running and transaxle in NEUTRAL
(N), slowly remove foot pressure from the regular
brake pedal. Do this until the vehicle is held by the
parking brake only.
·To check the PARK (P) mechanism's holding
ability: With the engine running, shift to PARK (P).
Then release the parking brake followed by the
regular brake.
Underbody Flushing Service
At least every spring, use plain water to ¯ush any
corrosive materials from the underbody. Take care to
clean thoroughly any areas where mud and other debris
can collect.
6-13

H
Hazard Warning Flashers................................... 3-6
Head Restraints............................................... 1-6
Headlamp High/Low-Beam Changer.................... 3-8
Headlamp Wiring............................................5-94
Headlamp......................................................5-55
Aiming.......................................................5-55
Headlamps....................................................5-56
Bulb Replacement.......................................5-56
Halogen Bulbs............................................5-56
Headlamps, Front Turn Signal,
and Parking Lamps..................................5-56
Heated Outside Mirrors....................................2-36
Heated Seats................................................... 1-4
Highbeam Out Warning Message......................3-48
Highway Hypnosis...........................................4-23
Hill and Mountain Roads..................................4-23
Hitches..........................................................4-37
HomeLink Transmitter, Programming..................2-39
HomeLink
žTransmitter....................................2-39
Hood............................................................5-10
Checking Things Under................................5-10
Release.....................................................5-10
Horn............................................................... 3-7
Hot Coolant Temperature Warning Message........3-42
How to Add Coolant to the Coolant
Recovery Tank............................................5-35
How to Add Coolant to the Radiator..................5-38
How to Add Fluid............................................5-26How to Check Power Steering Fluid..................5-43
How to Check........................................5-24, 5-62
How to Inspect the Engine Air
Cleaner/Filter..............................................5-22
How to Use This Manual...................................... ii
How to Wear Safety Belts Properly...................1-14
Hydroplaning..................................................4-19
I
If No Steam Is Coming From Your Engine..........5-32
If Steam Is Coming From Your Engine...............5-31
If the Light Is Flashing.....................................3-38
If the Light Is on Steady..................................3-38
If You Are Stuck in Sand, Mud, Ice or Snow.......4-30
If You Do Decide To Pull A Trailer.....................4-35
If You're Caught in a Blizzard...........................4-28
Ignition Positions.............................................2-18
Ignition Transaxle Lock Check..........................6-13
Illumination on Remote Activation........................ 2-6
Infants and Young Children, Restraints...............1-33
In¯ation -- Tire Pressure..................................5-62
Inspection......................................................6-15
Brake System.............................................6-15
Engine Cooling System................................6-15
Exhaust System..........................................6-14
Fuel System...............................................6-15
Part C - Periodic Maintenance.......................6-14
Steering, Suspension and Front
Drive Axle Boot and Seal..........................6-14
7