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 XLE, FWDREPAIR AND DIAGNOSIS (SINGLE PAGE)ACCESSORIES & EQUIPMENTDRIVERS ASSISTANCE SYSTEMS - ADASINTUITIVE PARKING ASSIST SYSTEM - DIAGNOSTIC CODES & CIRCUIT TESTSINTUITIVE PARKING ASSIST SYSTEMDTC U1177-87: LOST COMMUNICATION WITH SIDE OBSTACLE DETECTION CONTROL MODULE "A" (CH2) MISSING MESSAGE; DTC U1178-87: LOST COMMUNICATION WITH SIDE OBSTACLE DETECTION CONTROL MODULE "B" (CH2) MISSING MESSAGE [11/2023 - ]DESCRIPTION
2025 Toyota Highlander XLE, FWD
DTC U1177-87: Lost Communication with Side Obstacle Detection Control Module "A" (ch2) Missing Message; DTC U1178-87: Lost Communication with Side Obstacle Detection Control Module "B" (ch2) Missing Message [11/2023 - ]: Description
2025 Toyota Highlander XLE, FWDSECTION Description
This DTC is output when the clearance warning ECU assembly detects lost communication with the blind spot monitor sensor.
| DTC No. | Detection Item | DTC Detection Condition | Trouble Area |
|---|---|---|---|
| U1177-87 | Lost Communication with Side Obstacle Detection Control Module "A" (ch2) Missing Message | The clearance warning ECU assembly is unable to receive communication from the blind spot monitor sensor RH (A) |
|
| U1178-87 | Lost Communication with Side Obstacle Detection Control Module "B" (ch2) Missing Message | The clearance warning ECU assembly is unable to receive communication from the blind spot monitor sensor LH (B) |
|
RENDER: 1.0x
NO RELATED
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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.