Normal Operation

WARNING: This page is about a different car, the 2007 Lincoln Mark LT and 2007 Ford Pickup. However, it is still accessible from the selected car via links, so may be relevant.

The multifunction switch provides voltage to the turn signal lamps depending on the position of the multifunction switch. When the multifunction switch is placed in the RH TURN position, current flows from the multifunction switch to the RH front turn signal indicator and RH signal mirror through circuit 2 (WH/LB). When the multifunction switch is placed into the LH TURN position, current flows from the multifunction switch to the LH front turn signal indicator and LH signal mirror through circuit 3 (LG/WH). Circuit grounds for each turn signal bulb and signal mirror are accomplished through circuit 57 (BK). The timed on/off cycle is determined in the indicator flasher relay and is set to flash approximately 80 times per minute if both the front and rear indicators operate. If only one turn signal lamp operates, the indicator flasher relay flashes the lamps approximately 160 times per minute.

NOTE: Late build vehicles equipped with trailer tow mirrors have a light emitting diode (LED) assembly that can be removed separately from the mirror assembly.

Possible Causes

Circuit 2 (WH/LB) open or short to voltage
Circuit 3 (LG/WH) open or short to voltage
Circuit 57 (BK) open
Multifunction switch
Trailer tow turn lamp (late build if equipped)
Signal mirror (if equipped)