My 99 f150 turn signals work but some times they dont. when i turn right it has a quick clicking sound. also the hazard lights do not come on at all. I just replaced the signal bulbs because of this and it still doesnt work. I CANT GET MY TRUCK INSPECTED!!!!!!!!!!!!!!!!!!!
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Re: signals and warning lights!!
You have a bad multifunction switch.It is not hard to replace just remove the bottom cover on steering column and top should raise up enough to get to the 2 screws holding the switch on.If you can not get enough clearance with top cover on then you will have to remove lock cylinder to get it off.Just turn key to on postion then look under the lock cylinder part of steering column and you will see a small hole.Stick a small screw driver or pic into the hole and push the pin then remove lock cylinder.
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Here is what the service manual says. Looks like it is not a flasher relay but a function of the body control module.
TURN SIGNAL AND HAZARD WARNING LAMP SYSTEMSystem Description OUTLINE Turn signal lamp and the hazard warning lamp is controlled by combination switch reading function and the flasher control function of BCM.
TURN SIGNAL LAMP OPERATION - BCM detects the combination switch condition by the combination switch reading function. - BCM supplies voltage to the right (left) turn signal lamp circuit when the ignition switch is turned ON and the turn signal switch is in the right (left) position. BCM blinks the turn signal lamp.
HAZARD WARNING LAMP OPERATION BCM supplies voltage to both turn signal lamp circuit when the hazard switch is turned ON. BCM blinks the hazard warning lamp.
TURN SIGNAL INDICATOR LAMP AND TURN SIGNAL SOUND OPERATION - BCM transmits the turn indicator signal to the combination meter with CAN communication while the turn signal lamp and the hazard warning lamp are operating. - Combination meter outputs the turn signal sound with the integrated buzzer while blinking the turn signal indicator lamp according to the turn indicator signal.
HIGH FLASHER OPERATION (FAIL-SAFE) - BCM detects the turn signal lamp circuit status by the terminal current value. - BCM increases the turn signal lamp blinking speed if the bulb or harness open is detected with the turn signal lamp operating. NOTE: The blinking speed is normal while operating the hazard warning lamp.
If the 15A HAZARD fuse in the passenger compartment fuse box is OK, power is getting to the hazard function of the flasher unit. Pressing the hzard switch should cause the hazard lights to flash. HOWEVER, there is an electronic time and warning indication system module connected to to the hazard switch lead and that may be affecting things. If the 10A TURN fuse is OK, power is applied to the turn switch (with the engine in START or RUN) and you state you can select a right or left turn. HOWEVER, the RED/WHT and RED/BLU outputs from the flasher unit connect directly to the front and rear turn lamps and the instrument cluster turn indicators so you are not getting any flasher output. Again, that electronic time & warning indication system module could be affecting things
It is not the flasher if the hazards work, it is 1 flasher for both turn signals and the hazard lamps. It is in a relay block ( along with the blower motor relay ) under the dash, about in line with the steering wheel column ).
Try tilting the steering wheel all the way up, and test again.
The other quick test is to cycle the hazard switch a few times, to see if it cleans the contacts for the turn signal on the MFS,
I had this problem, and to be honest, it happened to the left side about a week later...it's the board that the bulbs plug into...it's a very common problem with this model. So popular that you can normally get the socket board off the shelf at a parts store! it's extremely simple to replace, and I replaced all the bulbs at the same time!
try replacing the hazard relay it should be under the dash try turning it on and off with your head down by the floorboard to pinpoint the right relay and the location. you should be able to hear it easily. hope this helps.
I agree. My brake light dont work. Only the third brake light does. The running lights work but when i apply the brakes the rear tails dont light up.
I currently have this issue along with the signals dont work unless I bang the top of the steering colum. The hazard switch doesnt work either. If the signals dont work it makes this very quick clicking sound on the passenger side. I checked the fuses and they are good. The bulbs still work. The brake switch works cause the third brake light goes on. And seeing as I am having a problem with signals.....GM says I have to replace the switch in the steerg colume. Its a little box about the size of a cigarette pack. If you take apart the panels off ( right behind the steering wheel, where the hazard switch is) ...that is where it is located. Its plugged into the signal lever. Hope this helpa....Good luck everyone with this issue.