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.
2012 Lexus IS 250C Automatic TransFACTORY OEM SERVICE PROCEDURE
Diagnostic Trouble Code Chart
SMART ACCESS SYSTEM WITH PUSH-BUTTON START
| DTC Code | Detection Item | Trouble Area | Refer To |
|---|---|---|---|
| B2271 | Ignition Hold Monitor Malfunction | 1. AM2 fuse 2. Power source control ECU 3. Wire harness or connector |
Refer to DTC B2271: Ignition Hold Monitor Malfunction |
| B2272 | Ignition 1 Monitor Malfunction | 1. Main body ECU RH (cowl side junction block RH) 2. Main body ECU LH (cowl side junction block LH) 3. Power source control ECU 4. Wire harness or connector |
Refer to DTC B2272: Ignition 1 Monitor Malfunction |
| B2273 | Ignition 2 Monitor Malfunction | 1. IG2 relay 2. Power source control ECU 3. Wire harness or connector |
Refer to DTC B2273: Ignition 2 Monitor Malfunction |
| B2274 | ACC Monitor Malfunction | 1. Main body ECU RH (cowl side junction block RH) 2. Power source control ECU 3. Wire harness or connector |
Refer to DTC B2274: ACC Monitor Malfunction |
| B2275 | STSW Monitor Malfunction | 1. ECM 2. Power source control ECU 3. 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 | 1. Multiplex communication system 2. Combination meter 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 |
| 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 (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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