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 MANUALSTOYOTA2025HIGHLANDER PLATINUMREPAIR AND DIAGNOSISGENERAL INFORMATIONDTC INDEXDTC INDEX (5 OF 6)PARK ASSIST / MONITORING DTCSBLIND SPOT MONITOR SYSTEM
2025 Toyota Highlander Platinum
Blind Spot Monitor System
2025 Toyota Highlander PlatinumSECTION Blind Spot Monitor System
BLIND SPOT MONITOR SYSTEM DIAGNOSTIC TROUBLE CODE (DTC) IDENTIFICATION [12/2019 - 11/2023]
| DTC Code | Description |
|---|---|
| C1A45 | Vehicle Speed Sensor |
| C1A46 | Yaw Rate Sensor |
| C1A47 | Steering Angle Sensor |
| C1AB0 | Short to +B in Outer Mirror Indicator(Master) |
| C1AB1 | Short to +B in Outer Mirror Indicator(Slave) |
| C1AB2 | Short to GND in Outer Mirror Indicator(Master) |
| C1AB3 | Short to GND in Outer Mirror Indicator(Slave) |
| C1AB4 | Open in Outer Mirror Indicator(Master) |
| C1AB5 | Open in Outer Mirror Indicator(Slave) |
| C1AB6 | Blind Spot Monitor Master Module |
| C1AB7 | Blind Spot Monitor Slave Module |
| C1AB8 | Destination Information Undefined |
| C1ABB | Blind Spot Monitor Master Module Beam Axis Inspection Incomplete |
| C1ABC | Blind Spot Monitor Slave Module Beam Axis Inspection Incomplete |
| C1ABE | Short to GND or Open in Buzzer |
| C1AC1 | Master Module Horizontal Axis Misalignment |
| C1AC2 | Slave Module Horizontal Axis Misalignment |
| U0100 | Lost Communication with ECM / PCM "A" |
| U0100 | Lost Communication with ECM / PCM "A" |
| U0125 | Lost Communication with Yaw Rate Sensor Module |
| U0125 | Lost Communication with Yaw Rate Sensor Module |
| U0126 | Lost Communication with Steering Angle Sensor Module |
| U0126 | Lost Communication with Steering Angle Sensor Module |
| U0129 | Lost Communication with Brake System Control Module |
| U0129 | Lost Communication with Brake System Control Module |
| U0142 | Lost Communication with Body Control Module "B" |
| U0142 | Lost Communication with Body Control Module "B" |
| U0232 | Lost Communication with Blind Spot Monitor Slave Module |
| U0233 | Lost Communication with Blind Spot Monitor Master Module |
| U0293 | Lost Communication with Hybrid Vehicle Control System |
| U0293 | Lost Communication with Hybrid Vehicle Control System |
| U1331 | Software Incompatibility with Body Control Module "B" |
BLIND SPOT MONITOR SYSTEM DIAGNOSTIC TROUBLE CODE (DTC) IDENTIFICATION [11/2023 - ]
| DTC Code | Description |
|---|---|
| C1AB4-11 | Outer Mirror Indicator (Module "B" Side) Circuit Short to Ground |
| C1AB4-12 | Outer Mirror Indicator (Module "B" Side) Circuit Short to Battery |
| C1AB4-13 | Outer Mirror Indicator (Module "B" Side) Circuit Open |
| C1AB5-11 | Outer Mirror Indicator (Module "A" Side) Circuit Short to Ground |
| C1AB5-12 | Outer Mirror Indicator (Module "A" Side) Circuit Short to Battery |
| C1AB5-13 | Outer Mirror Indicator (Module "A" Side) Circuit Open |
| C1AB6-04 | Rear Side Radar Sensor (Module "B") System Internal Failure |
| C1AB7-04 | Rear Side Radar Sensor (Module "A") System Internal Failure |
| C1ABF-14 | RCTA Buzzer Circuit Short to Ground or Open |
| C1AC1-00 | Rear Side Radar Sensor (Module "B") Beam Axis Misalignment (Horizontal) |
| C1AC2-00 | Rear Side Radar Sensor (Module "A") Beam Axis Misalignment (Horizontal) |
| U0100-87 | Lost Communication With ECM/PCM "A" Missing Message |
| U0126-87 | Lost Communication with Steering Angle Sensor Module Missing Message |
| U0129-87 | Lost Communication with Brake System Control Module "A" Missing Message |
| U0140-87 | Lost Communication with Body Control Module Missing Message |
| U0232-87 | Lost Communication with Side Obstacle Detection Control Module "A" Missing Message |
| U0233-87 | Lost Communication with Side Obstacle Detection Control Module "B" Missing Message |
| U0293-87 | Lost Communication with Hybrid/EV Powertrain Control Module Missing Message |
| U0322-51 | Software Incompatibility with Body Control Module Not Programmed |
| U0322-51 | Software Incompatibility with Body Control Module Not Programmed |
| U0322-57 | Software Incompatibility with Body Control Module Invalid/Incompatible Software Component |
| U0322-57 | Software Incompatibility with Body Control Module Invalid/Incompatible Software Component |
| U1110-87 | Lost Communication with Clearance Sonar Module Missing Message |
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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.