2012 Lexus IS 250 Base, RWD, AutomaticFACTORY OEM SERVICE PROCEDURE

Diagnostic Trouble Code Chart

SMART ACCESS SYSTEM WITH PUSH-BUTTON START

DTC No. Detection Item Trouble Area Refer to
B2271 Ignition Hold Monitor Malfunction 1. AM2 fuse
2. IG2 relay
3. Cowl side J/B RH
4. Cowl side J/B LH
5. Power source control ECU
6. Wire harness or connector		 Refer to DTC B2271: Ignition Hold Monitor Malfunction
B2272 Ignition 1 Monitor Malfunction 1. AM2 Fuse
2. Cowl side J/B RH
3. Cowl side J/B LH
4. Power source control ECU
5. Wire harness or connector		 Refer to DTC B2272: Ignition 1 Monitor Malfunction
B2273 Ignition 2 Monitor Malfunction 1. AM2 fuse
2. IG2 relay
3. Power source control ECU
4. Wire harness or connector		 Refer to DTC B2273: Ignition 2 Monitor Malfunction
B2274 ACC Monitor Malfunction 1. AM2 fuse
2. Cowl side J/B RH
3. Power source control ECU
4. Wire harness or connector		 Refer to DTC B2274: ACC Monitor Malfunction
B2275 STSW Monitor Malfunction 1. AM2 fuse
2. ECM
3. Steering lock ECU
4. Power source control ECU
5. Wire harness or connector		 Refer to DTC B2275: STSW Monitor Malfunction
B2276 ACCR Signal Circuit Malfunction 1. Power source control ECU
2. ECM
3. Wire harness or connector		 Refer to DTC B2276: ACCR Signal Circuit Malfunction
B2277 Detecting Vehicle Submersion Power source control ECU Refer to DTC B2277: Detecting Vehicle Submersion
B2278 Engine Switch Circuit Malfunction 1. Engine switch
2. Power source control ECU
3. Wire harness or connector		 Refer to DTC B2278: Engine Switch Circuit Malfunction
B2281 "P" Signal Malfunction 1. Power source control ECU
2. Shift lock control ECU
3. ECM
4. Wire harness or connector		 Refer to DTC B2281: "P" Signal Malfunction
B2282 Vehicle Speed Signal Malfunction (Cable-Information does not Match to Bean-Information) 1. Multiplex communication system
2. Combination meter system
3. Power source control ECU
4. Wire harness or connector		 Refer to DTC B2282: Vehicle Speed Signal Malfunction
B2283 Vehicle Speed Sensor Malfunction 1. B2282 detection area
2. Combination meter
3. Speed sensor
4. Skid control ECU
5. Wire harness or connector		 Refer to DTC B2283: Vehicle Speed Sensor Malfunction
B2284 Brake Signal Malfunction 1. Stop light switch
2. Multiplex communication system
3. CAN communication system
4. ECM
5. Power source control ECU
6 Wire harness or connector		 Refer to DTC B2284: Brake Signal Malfunction
B2285 Steering Lock Position Signal Circuit Malfunction 1. Power source control ECU
2. Steering lock ECU
3. Wire harness or connector		 Refer to DTC B2285: Steering Lock Position Signal Circuit Malfunction
B2286 Runnable Signal Malfunction 1. Multiplex communication system
2. CAN communication system
3. ECM
4. Power source control ECU
5. Wire harness or connector		 Refer to DTC B2286: Runnable Signal Malfunction
B2287 LIN Communication Master Malfunction 1. Power source control ECU
2. Certification ECU
3. Wire harness or connector		 Refer to DTC B2287: LIN Communication Master Malfunction
B2288 Steering Lock Signal Circuit Malfunction 1. Power source control ECU
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. Power source control ECU
2. Engine immobiliser system
3. Wire harness or connector
4. Certification ECU		 Refer to DTC B2289: Key Collation Waiting Time Over
Factory Service Tools

Use the Manual With the Right Hardware

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

Disclosure: Verified tool recommendations may earn an affiliate commission at no cost to you.

Shop Manual-Ready ToolsCompare Repair QuoteQuote 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.