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 (4 OF 6)NETWORKING DTCSLIN COMMUNICATION SYSTEM
2025 Toyota Highlander Platinum
Lin Communication System
2025 Toyota Highlander PlatinumSECTION Lin Communication System
LIN COMMUNICATION SYSTEM DIAGNOSTIC TROUBLE CODE (DTC) IDENTIFICATION [12/2019 - 10/2021]
| DTC Code | Description |
|---|---|
| B1206 | P/W Master Switch Communication Stop |
| B1273 | Sliding Roof ECU Communication Stop |
| B2321 | D-Door Motor ECU Communication Stop |
| B2322 | P-Door Motor ECU Communication Stop |
| B2323 | RR-Door Motor ECU Communication Stop |
| B2324 | RL-Door Motor ECU Communication Stop |
| B2325 | LIN Communication Bus Malfunction |
| B2329 | Lost Communication with Sliding Sunshade ECU |
| B2785 | Communication Malfunction between ECUs Connected by LIN |
| B2786 | No Response from Steering Lock ECU |
| B2789 | No Response from ID BOX |
| B278C | Lost Communication with Power Source Control |
LIN COMMUNICATION SYSTEM DIAGNOSTIC TROUBLE CODE (DTC) IDENTIFICATION [10/2021 - 11/2023]
| DTC Code | Description |
|---|---|
| B1206 | P/W Master Switch Communication Stop |
| B1273 | Sliding Roof ECU Communication Stop |
| B2321 | D-Door Motor ECU Communication Stop |
| B2322 | P-Door Motor ECU Communication Stop |
| B2323 | RR-Door Motor ECU Communication Stop |
| B2324 | RL-Door Motor ECU Communication Stop |
| B2325 | LIN Communication Bus Malfunction |
| B2329 | Lost Communication with Sliding Sunshade ECU |
| B2785 | Communication Malfunction between ECUs Connected by LIN |
| B2789 | No Response from ID BOX |
| B278C | Lost Communication with Power Source Control |
LIN COMMUNICATION SYSTEM DIAGNOSTIC TROUBLE CODE (DTC) IDENTIFICATION [11/2023 - ]
| DTC Code | Description |
|---|---|
| B1206-87 | P/W Master SW System Missing Message |
| B1273-87 | Sliding Roof System Missing Message |
| B2287-87 | LIN Communication Missing Message |
| B2321-87 | D-Door P/W System Missing Message |
| B2322-87 | P-Door P/W System Missing Message |
| B2323-87 | RR-Door P/W System Missing Message |
| B2324-87 | RL-Door P/W System Missing Message |
| B2325-88 | Door LIN Bus off |
| B2329-87 | Sunshade System Missing Message |
| B276C-88 | Alarm / Wiper LIN Bus off |
| B2781-87 | Steering Lock System Missing Message |
| B2785-88 | Communication between ECUs connected by LIN Bus off |
| B2789-87 | ID-BOX Missing Message |
| B278C-87 | Power Source Control System 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.