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 MANUALSTOYOTA2005HIGHLANDER LIMITED, FWDREPAIR AND DIAGNOSISACCESSORIES & EQUIPMENTCOMMUNICATION DEVICESMULTIPLEX COMMUNICATION SYSTEM - DIAGNOSTICSPROBLEM SYMPTOMS TABLE
2005 Toyota Highlander Limited, FWD
Problem Symptoms Table
2005 Toyota Highlander Limited, FWDSECTION Problem Symptoms Table
- TROUBLESHOOTING FOR EACH PROBLEM SYMPTOM NOTE: Confirm the problem symptom and make an inspection depending on the applicable flow chart.PROBLEM SYMPTOMS TABLE - MULTIPLEX COMMUNICATION SYSTEM
Problem Symptom Suspected Area B1211/11 (no communication from driver door ECU for more than 10 seconds) - Power window regulator master switch assembly
- Wire harness
B1214 (short in communication circuit and +B power source system) - Power window regulator master switch assembly
- ECM
- Air conditioning amplifier assembly
- Combination meter assembly
- Theft warning ECU
- Sliding roof drive gear
- Wire harness
- MPX body ECU
B1215 (short in communication circuit and body ground) - Power window regulator master switch assembly
- ECM
- Air conditioning amplifier assembly
- Combination meter assembly
- Theft warning ECU
- Sliding roof drive gear
- Wire harness
- MPX body ECU
B1261 (no communication from ECM for more than 10 seconds) - ECM
- Wire harness
B1262/62 (no communication from A/C ECU for more than 10 seconds) - Air conditioning amplifier assembly
- Wire harness
B1269/69 (no communication from theft deterrent ECU for more than 10 seconds) - Theft warning ECU
- Wire harness
B1271 (no communication from combination meter ECU for more than 10 seconds) - Combination meter assembly
- Wire harness
B1273/73 (no communication from sliding roof control ECU for more than 10 seconds) - Sliding roof drive gear
- Wire harness
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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.