20 Most Recent 2003 GMC Sierra 1500 - Page 6 Questions & Answers

Where?

Which one?

Check power lock relay for malfunction

Is this a new body-style 99? The electric motors that control the doors inside your heater unit are prone to failure. Your best bet is to have a qualified technician take a look at it. A good scanner will show which motor is bad.

The most likely culprit is your driver's door control module... it's built into the driver's window switches. Double-check all your fuses before replacing any parts.

If the battery is fully charged, and you have lights but no crank, the problem could be the anti-theft system, or the neutral safety switch, or the starter among other things.You would need to check for power on the small wire on the starter solenoid when the key switch is in the start position.

2 things. First check that the alternator is operating at 14.7 volts. Then check with everything turned on to see if it drops. Might not be big enough for everything running. Second measure between battery positive terminal and alternator output to see if different. Might have bad connection or wire in the system.

whats the concern dead battery or gauge reading? do you have a volt meter to test circuits?

Check your brake rotors,are they worn even and no worn marks.When replacing,do both.

looks like you have an alternator problem should put out atleast 14 volts any autozone or parts distributor can test it for you on or off the truck good luck

Yes it could be the thermostat or low coolant.If the radiator is full, I would suspect the thermostat.

Have to diagnose a fault in that systemTough to do without manuals to learn the systemIf you have a motor on the tranfer case check that outMay find something on You TubeGet to the site the put in your yr,veh & question

Removal & Installation

1. Disconnect the negative battery cable.
   
2. Remove the instrument panel compartment.
   
3. Unfasten the forward-most screw in the right side door sill plate. Remove the trim panel from the right hinge pillar.
   
4. If necessary for access, unplug the ECM wiring and remove the ECM.
   
5. Unplug the electrical lead at the blower motor and if equipped, remove the under dash courtesy lamp.
   
6. Remove the bolt from the right side lower instrument panel support. Remove the blower cover and the cooling tube.
   
7. Unfasten the flange screws and pull out the blower motor. You may have to pry back the right side of the instrument panel slightly. Be careful!
   

To install:

1. Position the blower motor and install the mounting screws. Be careful not to catch the blower on anything when sliding it in.
   
2. Install the cooling tube and the blower shield.
   
3. Install the bolt into the instrument panel support.
   
4. Attach the courtesy lamp and the blower electrical lead.
   
5. If removed, install the ECM. Attach the wiring harness.
   
6. Install the trim panel on the pillar. Don't forget the screw in the sill plate!
   
7. Install the instrument panel compartment and connect the battery cable.

1. Disconnect the negative battery cable.
   
2. Remove the instrument panel (IP) storage compartment.
   
3. Remove the front screw from the right door sill plate.
   
4. Remove the right hinge pillar trim plate.
   
5. Disconnect the electrical connectors from the blower motor, as necessary.
   
6. Remove the bolt from the right lower IP support.
   
7. Remove the blower motor cover.
   
8. Remove the motor cooling tube.
   
9. Remove the blower motor flange screws and ferrules.
   
10. Perform the following steps in order to remove the blower motor:
    Carefully pull the blower motor forward in order to avoid distorting the blower motor fan. If necessary, pry back the right side of the IP.
11. Inspect the blower motor terminals for distortion.
    
12. Clean corrosion from the terminals as necessary.
    
13. Replace the blower motor as necessary.
    
14. Inspect the flange of the blower motor for damage or distortion that may cause an air leak.
    
15. Repair the flange as necessary.
    
16. Inspect the blower fan for any damage and distortion.

To install:

1. Guide the blower motor and blower fan into position. Be careful in order not to catch the blower fan on any protruding components.
   
2. Install the blower motor flange ferrules and screws. Tighten the blower motor mounting screws to 20 inch lbs. (2.1 Nm).
   
3. Install the blower motor cooling tube.
   
4. Install the blower motor cover.
   
5. Install the bolt to the right lower IP support.
   
6. Install the electrical connectors to the blower motor, as necessary.
   
7. Install the right hinge pillar trim panel.
   
8. Install the front screw into the door sill plate.
   
9. Install the instrument panel storage compartment.
   
10. Install the negative battery cable.
    
11. Verify the circuit operation.

with Delphi Blower Motor

1. If equipped, remove the sound insulator panel.
   
2. Remove the blower motor insulating cover screws.
   
3. Disconnect the electrical connector from the blower motor.
   
4. Remove the blower motor insulating cover.
   
5. Pull the retaining tab down while turning the blower motor counterclockwise in order to disengage the blower motor from the heater/ventilation module.
   
6. Remove the blower motor.
   
   
   

   Fig. Pull the retaining tab down while turning the blower motor counterclockwise in order to disengage the blower motor (click image fo zoom)
   

To install:

1. Install the blower motor.
   
2. Install the blower motor to the heater/ventilation module. Turn the blower assembly clockwise until the retaining tab locks into place.
   
3. Install the blower motor insulating cover.
   
4. Connect the electrical connector to the blower motor.
   
5. Install the blower motor insulating cover screws.
   1. Tighten the screws to 14 inch lbs. (1.6 Nm).
6. If equipped, install the sound insulator panel.

with Visteon Blower Motor

1. Remove the sound insulator panel.
   
2. Disconnect the electrical connector (2) from the blower motor (1).
   
3. Remove the screws from the blower motor (1).
   
4. Remove the blower motor (1) from the HVAC module (3).
   
5. Remove the retainer from the blower motor wheel. Discard the retainer.
   
6. Remove the blower motor wheel from the blower motor (1).
   
   
   

   Fig. Replacing blower motor-Visteon
   

To install:

1. Install the blower motor wheel to the blower motor (1).
   
2. Install the New retainer to the blower motor wheel.
   
3. Install the blower motor (1) to the HVAC module (3).
   
4. Install the screws to the blower motor (1).
   1. Tighten the screws to 18 inch lbs. (2 Nm).
5. Connect the electrical connector (2) to the blower motor (1).
   
6. Install the sound insulator panel.

Hope this helps.

sounds like you have a bad cluster. The whole cluster needs replacing.cannot replace separately, cluster will need to be replaced at dealer tech will have to program the cluster.

there is a speed sensor that connects to the transmission. cheap fix but i would check that. also, the cable connections should be checked to make sure they are not corroding.

the lens is probly dirty, open it up and use a soft sock or soft cloth.

you have hydralic brake system.control by the power steering pump.check power steering pump fluid if low add.if fluid level good have the dealership check it out.your booster or power steering is going bad.

Hello,
The rear turn signals are wired through the Multifunction switch also called the turn signal switch. The Hazard switch is in that switch also and thats the circuitry the brake lights go through. You need to confirm voltage at the White wire off of the brake light switch and if its ok you have a bad multifunction switch.

I hope this helps.

Roy

Yes, There is 2 batteries. the high compression engine will not turn over fast enough with just one battery. not enough cranking amps. the 2 batteries are wired parraell of each other. thus producing the same voltage but the full cranking amps needed.