Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
Keyless Access DTCS
; B1602 Keyless Access Control Unit Internal (CPU) Error; Keyless Access Control Unit Internal (EEPROM) Error DTC B1605 Keyless Access Control Unit Lost Communication with MICU (MICU Message) DTC B1610 Keyless Access Control Unit Lost Communication with Gauge Control Module (VSP/NE Message) DTC B1613; B1614; B1615 Keyless Access Control Unit Lost Communication with Driver's MPCS Unit (DOOR SW Message); Keyless Access Control Unit Lost Communication with Driver's MPCS Unit (DRLOCKSW Message); Keyless Access Control Unit Lost Communication with Driver's MPCS Unit (ASLOCKSW Message) DTC B1626 Ignition Switch Control Unit No Response DTC B1627; B1640 RF Unit 1 Not Connected; RF Unit 1 Circuit Malfunction DTC B1628; B1641 RF Unit 2 Not Connected; RF Unit 2 Circuit Malfunction DTC B1645 Driver's Door LF Antenna Circuit Short DTC B1646 Driver's Door LF Antenna Circuit Open DTC B1647 Passenger's Door LF Antenna Circuit Short DTC B1648 Passenger's Door LF Antenna Circuit Open DTC B1657 Rear Bumper LF Antenna Circuit Short DTC B1658 Rear Bumper LF Antenna Circuit Open DTC B1659 Front Interior LF Antenna Circuit Short DTC B1660 Front Interior LF Antenna Circuit Open DTC B1663 Rear Interior LF Antenna Circuit Short DTC B1664 Rear Interior LF Antenna Circuit Open DTC B1667 Rear Shelf LF Antenna Circuit Short DTC B1668 Rear Shelf LF Antenna Circuit Open DTC B1671 Ignition Switch Control Unit (KEY SW) Circuit Open DTC B1672 Ignition Switch Control Unit (KNOB SW) Circuit Short DTC B1673 Ignition Switch Control Unit (KNOB SW) Circuit Open DTC B1674 Ignition Switch Control Unit (ROTATE SW) Circuit Short DTC B1675 Ignition Switch Control Unit (ROTATE SW) Circuit Open
Use the Manual With the Right Hardware
Pair factory procedures with proven DIY tools so the instructions are easier to execute.
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.