Thank you for asking your question on JustAnswer. LOL! (eight tiny reindeer) The engineers are great, aren't they. The most common cause of the problem you are having is a a possible defective SJB (Smart Junction Box).Before replacing any parts, I always
recommend proper testing first. If you need, I can send the test procedures as well as the replacement instructions directly from Ford.
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 engaged, 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.
Normal Operation — Fusion
When the smart junction box (SJB) detects the multifunction switch in the LH TURN position, the SJB sends voltage through circuit CLS21 (BU/GN) to the LH front turn lamp. When the SJB detects the multifunction switch in the RH TURN position, the SJB sends voltage through circuit CLS25 (YE/VT) to the RH front turn lamp. Circuit GD123 (BK/GY) and circuit GD121 (BK/YE) provide ground for the LH and RH front turn lamps, respectively. The rear turn lamps are controlled utilizing the rear stoplamp circuits.
- Circuit CLS18 (GY/BN) open, short to ground or voltage
- Circuit CLS19 (VT/OG) open, short to ground or voltage
- Circuit CLS21 (BU/GN) open, short to ground or voltage
- Circuit CLS25 (YE/VT) open, short to ground or voltage
- Circuit GD121 (BK/YE) open
- Circuit GD123 (BK/GY) open
- Circuit GD171 (BK/GY) open
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