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Light bulbs require power and ground in order to work. The ground circuit for the left rear combination lamp is shared between the turn lamp, stop lamp and tail lamp. Because the tail light still works in that specific combination lamp, we know that the shared/common ground for that assembly is OK. The power circuit for both stop lamps (left and right) have the same origin; voltage flows from the STOP LP FUSE (15A) through the DBC RELAY (when the stop lamp switch is pressed) and then to each stop lamp via their respective circuit branches. Because the right stop lamp works, we know that the shared/common fuse, relay and switch are all OK. I'd suspect an open in the left stop lamp power supply branch and would recommending checking for voltage on the green & black wire at the left rear combination lamp assembly to confirm. Regarding the left lamp on the hatch, the wiring diagram indicates these are not stop lamps rather tail lamps only. I'd recommend installing a tail lamp bulb instead of a brake light bulb into that assembly as a first step. You can read more here: https://www.yourmechanic.com/article/how-to-replace-your-car-fuse-box-by-jessica-howe
Your front park lamps and rear tail lamps, use the same fuse and park lamp relay. So if the front park lamps work it's not the fuse or relay. The problem should be the wire circuit. The wire color for voltage at rear tail lamps is violet with white tracer. Use a test light and check for voltage, lamps turned on.
Your stop and turn work ok, correct?
The only thing that both the brake lights and tail lights use is a ground connection. Keep in mind the warning light on the dash may be for any exterior lamp. You may need to check the sockets and grounds on all four corners of the car.
The SJB supplies power to the interior lighting system. The SJB will set DTCs if certain circuit failures exist with the interior lighting system.
Visual Inspection Chart
Mechanical
Electrical
Your Tail Lamp/Park Lamp system is pretty easy to check. ayou can check to see which part of the system is failing by checking for power and ground at the socket for the tail lamp relay. The tail lamp relay is located in the driver's side junction box under the left side of the dash. It is the relay that is second from the bottom at the far left. To check the circuits, you just need a 12 volt test light. Remove the relay and do the following tests: Connect one end of the test lamp to the battery NEGATIVE post. with the other end probe pins 1 and 5 of the relay connector. Both of these pins should have power (light your test light) at all times. If they do not, or if one is hot and the other one is not, the problem is most likely in the junction block itself.
Switch your test lamp lead from the battery negative terminal to the battery POSITIVE terminal. Probe pin 3. Your test lamp should light, but may be a little dim. This is the circuit through your tail and park lamps to ground. Your park lamps should also light dimly when you do this. If the light does not light at all, then you need to check for a blown fuse at the 10 Amp "TAIL" fuse located inside the drivers side kick panel fuse block. If this fuse is blown, you will need to trace your tail and park lamp circuits to find out where they are shorting.
With your test lamp still connected to battery positive, probe pin 2 at the relay connector. This connector should not do anything until the headlamp (combination) switch is turned on. When it is turned on, your test lamp should light. I am not absolutely certain, but you MAY have to turn the ignition switch on to get this to work. This circuit is actually grounded by the body control computer, and the service manual does not say if it will work without the ignition on. If your test lamp does not light with the light switch turned on and the ignition switch on, then the problem is either the light switch, the body computer, or the wiring in between them. You will need a scan tool that can read live data from the body computer to find out if the body computer is receiving the signal from the headlamp switch. If you have not located the cause of the problem at this point, I would recommend getting with somebody that has the proper equipment to diagnose your computer system.
You probably have an open/blown tail/park lamp fuse. The dash light fuse gets power from the tail/park lamp fuse, so when you can't see your dash lights, you'll get the vehicle looked at and find you have no park/tail lamps either. It's a safety feature because otherwise you may never know your running lights are not working.
Check your park/tail lamp fuse.
I will try this method. Thank You!
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