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Thank you for asking your question on JustAnswer. The most likely cause of the problem you are having is a defective SJB (Smart Junction Box). Before replacing any parts I do recommend proper testing first. If you need I can send test procedures in order to determine the exact cause.
Pinpoint Test G: One Or More Stoplamps Are Inoperative
The SJB monitors voltage input from the stoplamp switch. When the SJB senses brake pedal application, the SJB sends voltage to the rear lamps. Voltage for the LH and RH rear lamps is supplied through circuits 1363 (WH/RD) and 1365 (GY/LB) respectively. Voltage for the high mounted stoplamp is supplied through circuit 1456 (RD/LB). Ground for the stoplamps is provided through circuit 1205 (BK).
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When the multifunction switch is placed in the LH or RH turn positions, the voltage signal sent by the SJB is routed to circuit 2068 (BK/LB). With the multifunction switch in the LH or RH turn positions, the SJB controls the supply voltage to the respective turn lamps which then flash approximately 80 times per minute. The LH front turn lamp is supplied voltage from circuit 1342 (GY/BK). The RH front turn lamp is supplied voltage from circuit 1341 (DB/OG). The LH rear turn lamp is supplied voltage from circuit 1363 (WH/RD). The RH rear turn lamp is supplied voltage from circuit 1365 (GY/LB). The LH signal mirror is supplied voltage from circuit 1546 (PK). The RH signal mirror is supplied voltage from circuit 1547 (RD). Ground for the LH front turn lamp is supplied through circuit 1205 (BK) from the BEC. Ground for the other turn lamps is supplied through circuit 1205 (BK).
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Also I was referring to this previous question a year ago.
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