Front and rear turn signals not working on lincoln navigator

If the front blinkers on your 2011 Lincoln Navigator are not working, but the rear blinkers are, there are a few things you can check:

1. Check the fuses: The first thing to check is the fuses for the turn signals. Look for the fuse box that contains the fuses for the turn signals and check to see if any of them are blown.
2. Check the bulbs: You mentioned that you already checked the bulbs, but it's always a good idea to double-check. Make sure the bulbs are the correct size and are securely installed.
3. Check the wiring: Check the wiring for any visible damage, corrosion or loose connections. Look for any frayed or damaged wires that may be causing a short circuit.
4. Check the turn signal switch: The turn signal switch may be faulty, preventing the front blinkers from working. Test the turn signal switch to see if it is working properly.

If none of these steps solve the problem, it's possible that there may be an issue with the wiring harness or the control module. In this case, it's recommended to take the vehicle to a professional mechanic for further diagnosis and repair.

Note the diagram. Left rear turn, the light green wire with orange tracer is voltage. The black wire ground. You need both voltage and ground. Use a test light to check. The voltage for turn signal comes from multifunction switch. As far as the ground, you could try a redundant ground? good luck

Doesn't have a turn signal flasher , use's lighting control module .
Turn Signal and Hazard Lamps The turn signal system consists of:

• turn signal miniature bulbs (13465).
• turn signal indicators in the instrument cluster (10849).
• lighting control module.
• multi-function switch (13K359).
• circuit wiring and circuit protection.

Power is supplied to the lighting control module through instrument panel Fuse 6 (10A). This fuse is hot in START or RUN. The lighting control module is connected to the turn signal switch portion of the multi-function switch. Ground is provided to the lighting control module and the turn signal miniature bulbs through Circuit 57 (BK).
Turn signal functions are performed by double filament bulbs in lamp assemblies located next to the headlamps. The turn/hazard function uses the second filament of the appropriate bulb(s).

• With the multi-function switch in the right turn position, power is supplied to the RH front and rear turn signal miniature bulbs and the right turn indicator in the instrument cluster.
• With the multi-function switch in the left turn position, power is supplied to the LH front and rear turn signal miniature bulbs and the left turn indicator in the instrument cluster.

Principles of Operation
The smart junction box (SJB) monitors the multifunction switch position by sending multiple voltage reference signals to the multifunction switch. When the multifunction switch is in the LH or RH TURN positions, or the hazard lamp switch is pressed, that input signal is routed to ground.
When the SJB receives a request for a turn signal or hazard lamps, the SJB supplies voltage to the appropriate turn lamps.
The timed on/off cycle is determined by the SJB and is set to flash approximately 80 times per minute if both the front and rear turn lamps operate correctly. If an individual turn signal lamp is inoperative, the SJB flashes the remaining turn lamp approximately 160 times per minute.

Smart Junction Box (SJB) Diagnostic Trouble Code (DTC) Chart DTC Description Action B2A27 Right Front Turn Lamp Circuit Open Go To Pinpoint Test M . B2A28 Right Front Turn Lamp Circuit Short to Ground Go To Pinpoint Test M . B2A29 Left Front Turn Lamp Circuit Open Go To Pinpoint Test M . B2A2A Left Front Turn Lamp Circuit Short to Ground Go To Pinpoint Test M . B2071 Hazard Switch Signal Short to Ground Go To Pinpoint Test N . B2281 Right Turn Switch Short to Ground Go To Pinpoint Test L . B2282 Left Turn Switch Short to Ground Go To Pinpoint Test L . All other DTCs - REFER to Section 419-10 .
Your best bet ,take it to a qualified repair shop . because i'am pretty you don't have a factory or professional scan tool to read these codes . Part stores can't read these code . And you probably don't have service repair info. for diagnosing one of these codes .

It doesn't have one Controlled by smart junction box .
The smart junction box (SJB) monitors the multifunction switch position by sending multiple voltage reference signals to the multifunction switch. When the multifunction switch is in the LH or RH TURN positions, or the hazard lamp switch is pressed, that input signal is routed to ground.
When the SJB receives a request for a turn signal or hazard lamps, the SJB supplies voltage to the appropriate turn lamps.
The timed on/off cycle is determined by the SJB and is set to flash approximately 80 times per minute if both the front and rear turn lamps operate correctly. If an individual turn signal lamp is inoperative, the SJB flashes the remaining turn lamp approximately 160 times per minute.

Front right and rear right are on a different circuit than the left front an left rear. Locate the Flasher control module behind dash. With key in RUN position check for pulsing battery voltage on the Green/white wire coming out of the flasher control module electrical connector. If no battery voltage, check for battery voltage coming into the flasher from the turn signal switch on the white/red wire. Left turn input is on the white/black wire. If not battery voltage on white/red, but voltage on white/black when turning left, then the turn signal switch is bad

Try this from my previous post....

Have a similar problem... My 2003 Lincoln Navigator was manufactured May 22, 2003 so it's the late model that came with the Intec 5.4 Liter DOHC V-8 (not the Triton engine).

I replaced the two front ride height sensors (one for each air strut) and replaced the one rear ride height sensor that controls the ride height for BOTH rear air struts. (Yours may have one ride height sensor for each of the rear air struts.) That solved the problem for a few months during the warm months, until the weather started cooling off. Then back to the same issue.

The front passenger air strut started releasing air from the solenoid (air block) making a "hissing sound." Replaced BOTH front air strut solenoids (connected at the top of each air strut). That also resolved the problem for a few days. After going all around the world, I discovered it's the Air Ride Control Module (ASM) that was the problem all along.

not enogh infrmation

left front bulb is burned out.

It's most likely the bulb that is burnt out.It could be front or rear on the same side.