2012 Toyota Highlander Limited, FWDFACTORY OEM SERVICE PROCEDURE

Diagnostic Trouble Code Chart

SMART KEY SYSTEM:

DTC Code Detection Item Trouble Area See
B2271 Ignition Hold Monitor Malfunction 1. AM2 fuse
2. Main body ECU (Instrument panel junction block)
3. Wire harness or connector		 Refer to DTC B2271: Ignition Hold Monitor Malfunction
B2272 Ignition 1 Monitor Malfunction 1. IG1 relay
2. Main body ECU (Instrument panel junction block)
3. Wire harness or connector		 Refer to DTC B2272: Ignition 1 Monitor Malfunction
B2273 Ignition 2 Monitor Malfunction 1. IG2 relay
2. Main body ECU (Instrument panel junction block)
3. Wire harness or connector		 Refer to DTC B2273: Ignition 2 Monitor Malfunction
B2274 ACC Monitor Malfunction 1. ACC relay
2. Main body ECU (Instrument panel junction block)
3. Wire harness or connector		 Refer to DTC B2274: ACC Monitor Malfunction
B2275 STSW Monitor Malfunction 1. ECM
2. Main body ECU (Instrument panel junction block)
3. Wire harness or connector		 Refer to DTC B2275: STSW Monitor Malfunction
B2276 ACCR Signal Circuit Malfunction 1. Main body ECU (Instrument panel junction block)
2. ECM
3. Wire harness or connector		 Refer to DTC B2276: ACCR Signal Circuit Malfunction
B2277 Detecting Vehicle Submersion Main body ECU (Instrument panel junction block) Refer to DTC B2277: Detecting Vehicle Submersion
B2278 Engine Switch Circuit Malfunction 1. Engine switch
2. Main body ECU (Instrument panel junction block)
3. Wire harness or connector		 Refer to DTC B2278: Engine Switch Circuit Malfunction
B2281 "P" Signal Malfunction 1. Main body ECU
2. Shift lock control ECU
3. Wire harness or connector		 Refer to DTC B2281: "P" Signal Malfunction
B2282 Vehicle Speed Signal Malfunction 1. CAN communication system
2. Combination meter system
3. Main body ECU (Instrument panel junction block)
4. Wire harness or connector		 Refer to DTC B2282: Vehicle Speed Signal Malfunction; DTC B2283: Vehicle Speed Sensor Malfunction
B2283 Vehicle Speed Sensor Malfunction 1. DTC B2282 detection area
2. Combination meter
3. Speed sensor
4. Skid control ECU
5. Main body ECU (instrument panel junction block)
6. Wire harness or connector		 Refer to DTC B2282: Vehicle Speed Signal Malfunction; DTC B2283: Vehicle Speed Sensor Malfunction
B2284 Brake Signal Malfunction 1. Stop light switch
2. CAN communication system
3. ECM
4. Main body ECU (Instrument panel junction block)
5. Wire harness or connector		 Refer to DTC B2284: Brake Signal Malfunction
B2285 Steering Lock Position Signal Circuit Malfunction 1. Main body ECU (Instrument panel junction block)
2. Steering lock ECU
3. Wire harness or connector		 Refer to DTC B2285: Steering Lock Position Signal Circuit Malfunction
B2286 Runnable Signal Malfunction 1. CAN communication system
2. ECM
3. Main body ECU (Instrument panel junction block)
4. Wire harness or connector		 Refer to DTC B2286: Runnable Signal Malfunction
B2287 LIN Communication Master Malfunction 1. Main body ECU (Instrument panel junction block)
2. Certification ECU (smart key ECU assembly)
3. Wire harness or connector		 Refer to DTC B2287: LIN Communication Master Malfunction
B2288 Steering Lock Signal Circuit Malfunction 1. Main body ECU (Instrument panel junction block)
2. Steering lock ECU
3. Wire harness or connector		 Refer to DTC B2288: Steering Lock Signal Circuit Malfunction
B2289 Key Collation Waiting Time Over 1. Main body ECU (Instrument panel junction block)
2. Smart key system
3. Wire harness or connector
4. Certification ECU (smart key ECU assembly)		 Refer to DTC B2289: Key Collation Waiting Time Over
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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