My 2003 Chevy Trailblazer fan stays on after I remove the key and also the brake lights do not work, the center one on top of the rear hatch does still work
Do you mean the blower motor for the heater stays on? Have you checked the power from the brake switch on the brake pedal (orange wire)?
Yes the blower motor for the heater stays on. Also when I have the vehicle running, I can not change the blower speed and when I change the tempature the air changes where it is blower to, from defrost to vent to floor depending on what tempature I change it to. I will go and check the and see if I can find the brake swithc and the ornge wire and get back to you in a few minutes.
#06-01-39-002C: Blower Motor Inoperative or May Not Shut Off in Extremely Low Ambient Temperature Conditions (Replace Blower Motor Control Module) - (Jan 18, 2008)
This bulletin is being revised to update the model years that are affected and add the Oldsmobile Bravada. Please discard Corporate Bulletin Number 06-01-39-002B (Section 01 -- HVAC).
Some customers may comment that the blower motor is inoperative or continues to run after the vehicle has been shut off.
These conditions may be caused by a blower motor control module failure. This failure may occur when the vehicle is operated in ambient temperature conditions of -23°C (-10°F) or below.
Important: Replace the blower motor control module if the vehicle experienced a blower motor control module failure in extremely cold ambient temperature conditions.
Technicians are to replace the blower motor control module, also called the Linear Power Module (LPM), with the P/N listed below. Refer to either the Blower Motor Control Processor Replacement or Blower Motor Processor Replacement-Auxiliary procedures in SI. After replacement of the blower motor control module, the customer may notice a slightly higher than expected blower motor speed at any of the blower speed settings.
Module Assembly, Auxiliary Blower Motor Control (Rear System on Escalade ESV, Suburban, Yukon XL)
Module, HTR & BLO & A/C CONT (Front system only vehicles - Except H2)
Module Assembly, Blower Motor Control (H2 Models)
Module Assembly, Auxiliary Heater & A/C Control (Rear System on Escalade, Yukon, Tahoe)
GM Mark of Excellence/ Service Guild Participant with 13 years experience, ASE Master Certified
Will I need to replace both of the blower modules for the Trailblazer. And which one listed above is for the Trailblazer.
Just the module for the main blower and have your local GM parts dept. look up the correct part. They probably stock them since this is a common failure on most GM trucks and SUVs.
Are they an easy part to replace, can a back yard mechanic do this.
Yes, fairly easy. Here are the instructions.
Instrument Panel Insulator Panel Replacement - Right Side Removal Procedure
Notice: Use the correct fastener in the correct location. Replacement fasteners must be the correct part number for that application. Fasteners requiring replacement or fasteners requiring the use of thread locking compound or sealant are identified in the service procedure. Do not use paints, lubricants, or corrosion inhibitors on fasteners or fastener joint surfaces unless specified. These coatings affect fastener torque and joint clamping force and may damage the fastener. Use the correct tightening sequence and specifications when installing fasteners in order to avoid damage to parts and systems.
Tighten Tighten the screws to 2.5 N·m (22 lb in).
Blower Motor Control Processor Replacement Removal Procedure
Tighten Tighten the screws to 1.9 N·m (17 lb in).
Any help with my brake lights not working. I cannot reach the orange wire on the switch on the brake pedal to get a voltage reading. Can I check for voltage at the brake light itself.
When you get this, can you give me more info on my brakes.
Stop Lamps Inoperative
Schematic Reference: Exterior Lights Schematics
Connector End View Reference: Lighting Systems Connector End Views
Did you review the Exterior Lighting Systems Description and Operation and perform the necessary inspections?
Go to Step 2
Go to Exterior Lighting Systems Description and Operation
Verify that the stop lamps are inoperative.
Do the stop lamps operate normally?
Go to Testing for Intermittent Conditions and Poor Connections in Wiring Systems
Go to Step 3
Is only one lamp inoperative?
Go to Step 4
Go to Step 5
Test the inoperative bulb, LED, or tail lamp printed circuit board for an open or poor terminal contact. Refer to Circuit Testing in Wiring Systems.
Did you find a condition?
Go to Step 10
Go to Step 9
Connect a test lamp from ground to the supply voltage circuit terminal of the inoperative lamp socket or connector and apply the service brake. Refer to Circuit Testing in Wiring Systems.
Does the test lamp illuminate?
Go to Step 7
Go to Step 6
Remove the stop lamp switch and install a fused jumper between the stop lamp switch battery positive voltage circuit terminal and the stop lamp switch signal circuit terminal of the stop lamp switch connector.
Do the stop lamps illuminate?
Go to Step 11
Go to Step 8
Repair the open or high resistance in the ground circuit of the inoperative lamp. Refer to Wiring Repairs in Wiring Systems.
Is the repair complete?
Go to Step 12
Repair the open, high resistance or short to ground in one of the following circuits. Refer to Wiring Repairs in Wiring Systems.
Repair one of the following conditions. Refer to Wiring Repairs in Wiring Systems.
Replace the inoperative bulb, high mounted stop lamp assembly, or tail lamp printed circuit. Refer to Tail Lamp Bulb Replacement , High Mount Stop Lamp Replacement , or Tail Lamp Circuit Board Replacement .
Replace the stop lamp switch. Refer to Stop Lamp Switch Replacement .
Did you complete the repair?
Operate the system in order to verify the repair.
Did you correct the condition?
Do not completly understand, but will have to work on it.
Ok, check it out and let me know if you still need assistance.
Here is what I have. At the tail light I checked the voltage of the rear head lights and had voltage, also to determine which wire is for brakes. I also did this to determine voltage for turn signal, and back up lights. All had voltage and worked, Brake lights no voltage at plug to rear lights. put OHM meter to check resistance, low resistance with bake off and same reading with brake on. Are they talking about replacing the stop lamp switch in step 11, The one that is attached to the brake pedal.