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.
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HOMESERVICE MANUALSTOYOTA2018SIENNA LIMITED, AWDREPAIR AND DIAGNOSISRESTRAINTSRESTRAINTS CONTROL SYSTEMSPRE-COLLISION SYSTEM - DIAGNOSTIC CODES & CIRCUIT TESTS
2018 Toyota Sienna Limited, AWD
Pre-Collision System - Diagnostic Codes & Circuit Tests
2018 Toyota Sienna Limited, AWDSECTION Pre-Collision System - Diagnostic Codes & Circuit Tests
- Pre-Collision System
- Vehicle Control History [11/2017 - ]
- Diagnostic Codes
- DTC B2000: Short to B+ in Seat Belt Motor RH Circuit [12/2015 - 11/2017]
- DTC B2001: Short to GND in Seat Belt Motor RH Circuit [12/2015 - 11/2017]
- DTC B2002: Open in Seat Belt Motor RH Circuit [12/2015 - 11/2017]
- DTC B2005: Short to B+ in Seat Belt Motor LH Circuit [12/2015 - 11/2017]
- DTC B2006: Short to GND in Seat Belt Motor LH Circuit [12/2015 - 11/2017]
- DTC B2007: Open in Seat Belt Motor LH Circuit [12/2015 - 11/2017]
- DTC B2015: Open in Right Side Upper MOS; DTC B2016: Open in Right Side Lower MOS; DTC B2020: Open in Left Side Upper MOS; DTC B2021: Open in Left Side Lower MOS; DTC B2025: Right Side Current Detection Circuit Malfunction Hi; DTC B2026: Right Side Current Detection Circuit Malfunction Lo; DTC B2027: Right Side Over-Current Malfunction; DTC B2030: Left Side Current Detection Circuit Malfunction Hi; DTC B2031: Left Side Current Detection Circuit Malfunction Lo; DTC B2032: Left Side Over-Current Malfunction; DTC B2035: Power Supply Relay Adherence Malfunction; DTC B2040: EEPROM Malfunction; DTC B2041: Fall of Raised Voltage; DTC B2043: Fall of B+ Voltage; DTC B2047: Seat Belt Control ECU Inner Circuit Malfunction [12/2015 - 11/2017]
- DTC B2036: Power Supply Relay Malfunction Open [12/2015 - 11/2017]
- DTC B2060: ABS Malfunction [12/2015 - 11/2017]
- DTC B2064: Vehicle Type Signal Malfunction [12/2015 - 11/2017]
- DTC B2074: Driver Side Seat Belt Buckle Switch Circuit Malfunction; DTC B2075: Passenger Side Seat Belt Buckle Switch Circuit Malfunction [12/2015 - 11/2017]
- DTC B2085: Communication Error from Driving Support ECU to VSC ECU [12/2015 - 11/2017]
- DTC B2090: Driving Support System Malfunction [12/2015 - 11/2017]
- DTC C1A01: Driving Support ECU [12/2015 - 11/2017]
- DTC C1A01: Driving Support ECU [11/2017 - ]
- DTC C1A02: Vehicle Information Not Obtained [12/2015 - 11/2017]
- DTC C1A02: Vehicle Information Not Obtained [11/2017 - ]
- DTC C1A0A: Front Radar Sensor Region Code Mismatch [12/2015 - 11/2017]
- DTC C1A0A: Front Radar Sensor Region Code Mismatch [11/2017 - ]
- DTC C1A10: Front Radar Sensor [12/2015 - 11/2017]
- DTC C1A10: Front Radar Sensor [11/2017 - ]
- DTC C1A11: Front Radar Sensor Incorrect Axial Gap; DTC C1A14: Front Radar Sensor Beam Axis Not Adjusted [12/2015 - 11/2017]
- DTC C1A11: Front Radar Sensor Incorrect Axial Gap; DTC C1A14: Front Radar Sensor Beam Axis Not Adjusted [11/2017 - ]
- DTC C1A46: Yaw Rate Sensor [12/2015 - 11/2017]
- DTC C1A46: Yaw Rate Sensor [11/2017 - ]
- DTC C1A47: Steering Angle Sensor [12/2015 - 11/2017]
- DTC C1A47: Steering Angle Sensor [11/2017 - ]
- DTC C1A4A: Skid Control Buzzer Circuit [12/2015 - 11/2017]
- DTC C1A4A: Skid Control Buzzer Circuit [11/2017 - ]
- DTC C1A4B: Stop Light Relay Circuit [12/2015 - 11/2017]
- DTC C1A4B: Stop Light Relay Circuit [11/2017 - ]
- DTC C1A50: Brake System Malfunction [11/2017 - ]
- DTC C1A63: Other System Malfunction [11/2017 - ]
- DTC C1A64: Brake Control Signal Mismatch [11/2017 - ]
- DTC C1AA0: Front Camera Module Circuit [11/2017 - ]
- DTC C1AA9: Front Camera Module Beam Axis Not Adjusted [11/2017 - ]
- DTC C1AAE: Heater Circuit [11/2017 - ]
- DTC U0100: Lost Communication with ECM / PCM "A"; DTC U0125: Lost Communication with Yaw Rate Sensor Module; DTC U0126: Lost Communication with Steering Angle Sensor Module; DTC U0129: Lost Communication with Brake System Control Module [11/2017 - ]
- DTC U0122: Lost Communication with Vehicle Dynamics Control Module; DTC U0123: Lost Communication with Yaw Rate Sensor Module; DTC U0126: Lost Communication with Steering Angle Sensor Module; DTC U0140: Lost Communication with Main Body ECU; DTC U0151: Lost Communication with Airbag ECU; DTC U1100: Lost Communication with Seat Belt Control ECU [12/2015 - 11/2017]
- DTC U0235: Lost Communication with Cruise Control Front Distance Range Sensor; DTC U1104: Lost Communication with Driving Support ECU [12/2015 - 11/2017]
- DTC U0235: Lost Communication with Cruise Control Front Distance Range Sensor [11/2017 - ]
- DTC U023A: Lost Communication with Front Camera Module [11/2017 - ]
- DTC U1002: Lost Communication with Gateway Module [11/2017 - ]
- DTC U1104: Lost Communication with Driving Support ECU [11/2017 - ]
- Circuit Tests
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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.