Question about 2004 Chevrolet TrailBlazer
It seems like you have a loose or insulator peeled wire rubbing against the chassis somewhere that is shorting out the door locks and courtesy light circuits. Or a defective door lock relay. The only place I can think of where the two circuits are together is at the doors. I would bet that is on the driver's door where the problem is because is the door most used. So start by checking the door lock relay, swap it with another one of the same characteristics on the fuse box, if it is ok, remove the door locks fuse and check if the problem persists, if it does, then remove the courtesy light fuse and check again, this way you'll be able to identify which circuit is causing the problem. Also check the wiring to the door light switch on the door jamb. check the harness going into the door for peeled insulation or broken wires.
Good Luck! keep me posted.
Posted on Nov 13, 2010
Hi. Your vehicle has one or more shorts causing these symptoms. These shorts are difficult to isolate and fix without lots of expensive diagnostic equipment. I recommend that you look in the yellow pages for a nearby AutoElectric Repair Shop. These shops are equipped to find electrical problems in modern cars and then repair them. It will be money well spent, I assure you. Joe
Posted on Nov 13, 2010
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Posted on Jan 02, 2017
Tips for a great answer:
An open or short to ground in the lift gate lock relay battery positive voltage circuit
A faulty lift gate lock relay
An open or short to ground in the lift gate lock relay control circuit
A short to ground in the lift gate lock actuator lock control circuit
A faulty BCM
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Battery Constant 12v+ Positive Wire (+): Black/Yellow
Battery Constant 12v+ Positive Wire Location: Ignition Switch Harness
Starter Positive Wire (+): Blue/Red
Starter Positive Wire Location: Ignition Switch Harness
Ignition Positive Wire (+): Red
Ignition Positive Wire Location: Ignition Switch Harness
Accessory Positive Wire (+): Red/Yellow
Accessory Positive Wire Location: Ignition Switch Harness
Parking Light Positive Wire (+): Red
Parking Light Positive Wire Location: Low In Drivers Kick Panel
Power Door Lock Negative Wire (-): Add Actuator. This vehicle uses a central door locking system. When connecting a keyless entry, you will need to add a door lock actuator and some units will also require (2) extra relays.
Power Door Lock Negative Wire Location: To Drivers Door Only
Power Door Unlock Negative Wire (-): Add Actuator. This vehicle uses a central door locking system. When connecting a keyless entry, you will need to add a door lock actuator and some units will also require (2) extra relays.
Power Door Unlock Negative Wire Location: To Drivers Door Only
Door Trigger Negative Wire (-): Red/White
Door Trigger Negative Wire Location: In Black Plug, Above Hood Release
Domelight Supervision Wire: Use Door Trigger, Requires Relay
Domelight Supervision Wire Location: N/A
Horn Negative Wire (-): Red/Green
Horn Negative Wire Location: At Steering Column Harness
Tachometer Wire Negative Wire (-): Black/Blue
Tachometer Wire Negative Wire Location: At ECM, Under Drivers Side Dash
Brake Light Positive Wire (+): White/Black
Brake Light Positive Wire Location: At Switch Above Brake Pedal
CODE ALARM SYSTEM
Lock: Left button will lock all doors. Double chirp indicates locked.
Unlock: Right button will unlock driver's door only. Hold unlock button app 6 seconds, it will unlock all doors including rear gate. Single chirp indicated unlock.
If the car chirps or lights flash 4x the alarm was triggered.
Panic. Press both buttons to activate emergency honk and flashing lights.
Valet mode: With optional alarm onlyPress the red alarm button on the left of the steering wheel. The light will quickly double flash. To re-set back to normal mode, press the red alarm light button again
Battery failed and lights flashing?
Parking lights will flash when the vehicle's battery is disconnected and reconnected.
To stop lights from flashing, either:
Press remote transmitter "UNLOCK" button once OR turn the ignition switch to the "ON" position and press programming button for one second (see below).
The vehicle interior (courtesy) light and door open warning light (DOOR AJAR indicator) will then illuminate for 60 seconds when the ignition is turned off, or until the doors are locked with the remote transmitter. Yes, the dashboard instrument panel lights will flash when the parking lights flash.
Programming or Overriding the Alarm when you have lost the remote
Open driver's door.
Turn ignition key to 'On'
Press and *hold programming button* in (see diagram, button under dashboard)
After 15 seconds the the door locks will cycle 3 times. Do not release Programming button.
Press lock (left) button the remotes to be programmed. The door locks will cycle one time. Exit programming mode by releasing Programming button under dashboard and turning key to off.
Code Alarm Programming Button is under dashboard on the kick panel by the driver's left knee, left of the steering column. If you can't find it, it might still be tucked up in the wiring harness higher up in that same general area. The botton is recessed in a plastic ring (see diagram).
This button must be pressed while programming remotes or if the battery was disconnected and the lights are flashing.
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