SYS.OK|MANUAL.DB● LIVE
HOMESERVICE MANUALSTOYOTA2025HIGHLANDER XLE, FWDREPAIR AND DIAGNOSIS (SINGLE PAGE)ACCESSORIES & EQUIPMENTCOLLISION/AVOIDANCEPARKING SUPPORT BRAKE SYSTEM - DIAGNOSTIC CODESPARKING SUPPORT BRAKE 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 [12/2019 - 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 [12/2019 - 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)
  • Open or short in bus main line
  • Open or short in bus branch line
  • Open or short in wire harness connector (No. 22 CAN junction connector)
  • Clearance warning ECU assembly internal malfunction
  • Blind spot monitor sensor RH (A) internal malfunction
  • Blind spot monitor sensor RH (A) power source circuit malfunction
  • Blind spot monitor sensor RH (A) internal malfunction
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)
  • Open or short in bus main line
  • Open or short in bus branch line
  • Open or short in wire harness connector (No. 22 CAN junction connector)
  • Clearance warning ECU assembly internal malfunction
  • Blind spot monitor sensor LH (B) internal malfunction
  • Blind spot monitor sensor LH (B) power source circuit malfunction
  • Blind spot monitor sensor LH (B) internal malfunction
RENDER: 1.0x

NO RELATED

Recommended Tools & Savings

Use the Manual With the Right Hardware

Pair factory procedures with proven DIY tools so the instructions are easier to execute.

Affiliate disclosure: We may earn a commission at no extra cost to you.

Shop Manual-Ready ToolsFree Quote CheckQuote Shield Pro

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.