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Turn signal not working on a 05 impala

New signal switch still no turn signal headlights comes on no emergency or turn signals comes on or blink

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Have you checked the fuse for the signal lights yet? Verify the switch is getting power. Also the signal is produced by the BCM module not a flasher like in older cars. BCM is a module that controls most body electronics. See picture below.
Turn signal not working on a 05 impala - 15224203_primary__ra_p-zz34d0kni05kgtwdyxwri4cx-4-0.jpg

Posted on May 18, 2017

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Posted on Jan 02, 2017

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Where is the emergency flasher relay located on 2013 Rogue?


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.

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Turn signal lights don't work


The first place to start are fuses, check your owners manual for location, typically left side of dash.

The emergency (hazard) flashers and turn signals are on separate fuses and run through the hazard switch. If all the lights work when the hazard switch is on then the problem will likely be a blown turn signal fuse.

Other possibilities are the hazard switch itself is bad, the turn signal switch is bad or a broken wire, all of which require a meter (or test light) wiring diagram and knowledge of the circuit to test it - better to have it done.

Robert Grove
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