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.
2015 Lexus CT 200h BaseFACTORY OEM SERVICE PROCEDURE
Lin Communication System
MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU) DIAGNOSTIC TROUBLE CODE (DTC) IDENTIFICATION
| DTC Code | Detection Item | See |
|---|---|---|
| B1206 | P/W Master Switch Communication Stop | Refer to DTC B1206: P/W Master Switch Communication Stop [08/2014 - ] |
| B1273 *1 |
Sliding Roof ECU Communication Stop | Refer to DTC B1273: Sliding Roof ECU Communication Stop [08/2014 - ] |
| B2321 | Driver Side Door ECU Communication Stop | Refer to DTC B2321: Driver Side Door ECU Communication Stop [08/2014 - ] |
| B2322 | Front Passenger Side Door ECU Communication Stop | Refer to DTC B2322: Front Passenger Side Door ECU Communication Stop [08/2014 - ] |
| B2323 | Rear Door RH ECU Communication Stop | Refer to DTC B2323: Rear Door RH ECU Communication Stop [08/2014 - ] |
| B2324 | Rear Door LH ECU Communication Stop | Refer to DTC B2324: Rear Door LH ECU Communication Stop [08/2014 - ] |
| B2325 | LIN Communication Bus Malfunction | Refer to DTC B2325: LIN Communication Bus Malfunction [08/2014 - ] |
CERTIFICATION ECU (SMART KEY ECU ASSEMBLY) DIAGNOSTIC TROUBLE CODE (DTC) IDENTIFICATION
| DTC Code | Detection Item | See |
|---|---|---|
| B2785 | Communication Malfunction between ECUs Connected by LIN | Refer to DTC B2785: Communication Malfunction between ECUs Connected by LIN [08/2014 - ] |
| B2786 *2 |
No Response from Steering Lock ECU | Refer to DTC B2786: No Response from Steering Lock ECU [08/2014 - ] |
| B2789 | No Response from ID BOX | Refer to DTC B2789: No Response from ID BOX [08/2014 - ] |
| B278C | Lost Communication with Power Source Control | Refer to DTC B278C: Lost Communication with Power Source Control [08/2014 - ] |
POWER MANAGEMENT CONTROL ECU DIAGNOSTIC TROUBLE CODE (DTC) IDENTIFICATION
| DTC Code | Detection Item | See |
|---|---|---|
| B2287 | LIN Communication Master Malfunction | Refer to DTC B2287: LIN Communication Master Malfunction [08/2014 - ] |
Factory Service Tools
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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.
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