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2018 Toyota Sequoia Blind Spot Monitor DTC Code C1AB4 or C1AB5

Discussion in 'Tech Help' started by MG, Sep 10, 2018.

  1. MG

    MG Moderator

    Some 2018 model year Sequoia vehicles equipped with Blind Spot Monitor (BSM) and auto-dimming mirrors may exhibit a BSM warning message in the combination meter immediately after engine startup and an inoperative BSM system with Diagnostic Trouble Codes (DTCs)...

    *C1AB4 (Open in Outer Mirror Indicator [Master]) or
    *C1AB5 (Open in Outer Mirror Indicator [Slave])

    Follow the Repair Procedure in bulletin T-SB-0021-18 Revision 1 to address this condition.

    The fix is to Reflash Blind Spot Monitor Sensors (Both Sides)

    This repair is covered under the Toyota Basic Warranty. This warranty is in effect for 36 months or 36,000 miles, whichever occurs first, from the vehicle’s in-service date.


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