2005 Chevy Trailblazer Possible Electrical Issues

TKANTNER

MEMBER
2005 CHEVROLET TRAILBLAZER
6 CYL
4WD
AUTOMATIC
63,000 MILES

My trailblazer seems to be ill at the moment. It has several things going on at once and I am not sure if it is one problem causing all my issues or not. My fuel guage has been on the fritz for some time and it might just be the sensor, but I noticed a month or so ago that the backlight behind numbers on my radio have went out, then a week later, I couldn't turn my interior fan to the 5th setting as it would turn the fan off. This morning, I lost all fan function, but still noticed that I had trickles of heat through the ducts. Is there a "control module" that links these systems, or are these just a bad fan, blower motor and fuel gauge sensor?

1 Reply

BRIAN 1

MECHANIC
1,030 POSTS

These are 3 seperate problems, 1st the fuel guage it's usually the fuel level sensor, very common problem.2nd the back light on the radio is usually inside the radio, there is no replacing the bulbs in the radio, you have to replace the radio.3rd the blower motor not working is usually the resistor and connector, they overheat and get burnt and melt the connector and resistor. Some customers may comment that the blower will only work on low speeds or has become inoperative.

Correction
REPLACE THE BLOWER MOTOR RESISTOR AND RESISTOR MODULE CONNECTOR.

Replace the blower motor resistor and module connector using the following procedure:

Remove the blower fuse.
"� Fullsize Trucks and Utility Vehicles -- Htr A/C & HVAC 1 fuses

"� Midsize Utility Vehicles -- Blower Fuse 35 located in the Underhood Fuse Block

Lower the hush panel or close-out panel enough to gain access to the resistor module connector.
Disconnect the connector from the resistor module.
Remove the tape from the wiring harness to expose the wiring.

Cut the wires back far enough from the connector to eliminate any melted insulation on the wire.
Tip
Use the old connector as a map for splicing the wires for the new connector. Be sure to use the correct crimping tool from the terminal repair kit J 38125. Use only Duraseal splice sleeves. Other splice sleeves may not protect the splice from moisture or provide a good electrical connection.

Install the new connector. Use the yellow splice sleeves provided with the connector.
Install new blower motor resistor.
Reinstall the fuse or connector block. Test the blower motor to make sure all speeds are functional.
Reinstall the hush panel/close-out panel.
Here is the part# for the connector 15862656
post back with what you find and an other questions.