Location of control for tail light - 2005 Chevrolet Chevrolet Cobalt Base

Look at factory wiring diagrams an test electrical circuit.

Factory Service Manuals - NICOclub

System Description EKS008NW Control of the parking, license plate, and tail lamp operation is dependent upon the position of the lighting switch (combination switch). When the lighting switch is placed in the 1ST position, the BCM (body control module) receives input signal requesting the parking, license plate, and tail lamps to illuminate. This input signal is communicated to the IPDM E/R (intelligent power distribution module engine room) across the CAN communication lines. The CPU (central processing unit) of the IPDM E/R controls the tail lamp relay coil. When energized, this relay directs power to the parking, license plate, and tail lamps, which then illuminate. Power is supplied at all times ? through 10A fuse (No. 41, located in the IPDM E/R) ? to tail lamp relay, located in the IPDM E/R, and ? through 50A fusible link (letter f , located in the fuse and fusible link box) ? to BCM terminal 70. With the ignition switch in the ON or START position, power is supplied ? through 10A fuse [No. 1, located in the fuse block (J/B)] ? to BCM terminal 38. With the ignition switch in the ACC or ON position, power is supplied ? through 10A fuse [No. 6, located in the fuse block (J/B)] ? to BCM terminal 11. Ground is supplied ? to BCM terminal 67 ? through grounds F14, M57 and M61.

Brake light fuses should be in the "fuse box" under the hood.

the fuse box should be under the steering column inside the lower dash. there usually is a small cover to mark its location

You only need to change the tail light fuse if it is blown. If you haven't checked it already, do that. Those stop/tail bulbs are 2 filament bulbs. One filament is for brake lights, and other filament is for the tail lights. So it is possible to have brake lights and no tails, if the filaments for the tail lights are burned out. But of course, it is unlikely that all the tail lights would be out and all the brake lights still work.

You may need a voltmeter to help solve the problem. It could be a problem in the headlight switch (a problem with the park light function), but is more likely a problem with the Lighting Control Module- or the Body Control Module-whichever your car is equipped with. GM first came out with the LCM, and a year or two later came out with the BCM. Both are mini-computers to control lighting and cabin functions. You would have to use a voltmeter and check things like power in and power out at the BCM of the park lights. You would thus need a wiring diagram to go along with the voltmeter. Those modules are located up under the dash-you can use google to see pictures of them, and maybe find locations.

check the fuse labeled PARK in the interior fuse block located on the passenger side of the center counsel.

I’m happy to assist further over the phone at https://www.6ya.com/expert/jeremy_d728a59f986299fa

Power is supplied to the instrument illumination by the "TAIL/ILLUM LIGHT" fuse, Fuse #4 (15 Amp) located in the dash fuse block under the left side of the dash. This fuse provides power for both the primary and secondary sides of the TAIL LIGHT relay. The Combination (Headlamp) switch provides a ground path for the primary circuit of the TAIL LIGHT relay. When the primary circuit is completed by the Combination switch, the secondary contacts close and provide power to the tail lamps as well as to all of the instrument illumination bulbs. The ground for the instrument illumination bulbs is a variable-resistance circuit which is controlled by the illumination controller. The final ground for both the combination switch and the illumination controller is Ground G302, located under the center console.

The tail lights in your 2011 Honda Odessey are computer-controlled. The fuse that protects the tail lamp circuits is FUSE Number 22, located in the underhood fuse and relay box located in the right rear of the engine compartment. It is a 10 Amp fuse. There is also a tail light relay located in the same box.

Please NOTE: If the fuse is blown, the cause of the fuse blowing MUST be located and repaired. Simply replacing the fuse will only result in another blown fuse.

Also, relay failures are pretty rare. If you can find another relay in the relay box with the same part number on it, you can swap them to see if this helps.
If this does not get your tail lights working, you will have to scan your computer network for possible fault codes in order to locate the cause of the problem (which is really a good idea to BEGIN with).

Tail light and backuo light are separate circuits. Backup light is under the control of the backup switch located on the shift lever or transmission. Thats why one might work right and not other. Most troubles of this type are due to poor ground connections Check again what you did to change the tail light assembly

there is one fuse that controls both the dash lghs and tail lights
look in your owners manual for the correct fuse location

91 Honda Accord has 2 separate tail lights on each side(total of 4 pieces). My problem stemmed from a faulty control module on the right hand side(passenger side). The module in question is located inside the smaller of the 2 tail light sections. In order to change the module you have to remove the tail light. There are 4 nuts holding in the taillight section and 2 phillips head screws holding the module in. The module on this side is 6 pin plug in. The one on the drivers side is a 5 pin plug in. Whole effort takes about 45 minutes. It is strictly plug and play.