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 LS 460L AWDFACTORY OEM SERVICE PROCEDURE
Problem Symptoms Table
HINT:
- Use the table below to help determine the cause of the problem symptom. The potential causes of the symptoms are listed in order of probability in the "Suspected Area" column of the table. Check each symptom by checking the suspected areas in the order they are listed. Replace parts as necessary.
- The power tilt and power telescopic steering column system uses the CAN communication system, so check its diagnostic system before proceeding to troubleshooting.
- If the instruction "PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE" is given in the flowchart of a symptom, proceed to the next suspected area in the table below to continue the check.
- If the problem still occurs when there is no abnormality in the related circuits, check the multiplex tilt and telescopic ECU and replace it if necessary.
- Problem symptoms may occur if the electric power control system's functions malfunction. Follow the HOW TO PROCEED WITH TROUBLESHOOTING procedures.
POWER TILT AND POWER TELESCOPIC STEERING COLUMN SYSTEM
| Symptom | Suspected Area | Reference |
|---|---|---|
| Only manual switch does not operate | Tilt and telescopic manual switch circuit | Refer to DTC B2603: Tilt and Telescopic Manual Switch Circuit Malfunction |
| Headlight dimmer switch assembly (Tilt and Telescopic manual switch) | Refer to DTC B2603: Tilt and Telescopic Manual Switch Circuit Malfunction | |
| Multiplex tilt and telescopic ECU | Refer to REMOVAL | |
| Only auto away/return function does not operate | Check customization status of auto away function using Techstream | Refer to CUSTOMIZE PARAMETERS |
| IG power source circuit | Refer to IG Power Source Circuit | |
| Multiplex tilt and telescopic ECU | Refer to REMOVAL | |
| Only auto away function does not operate | Smart access system with push button start function | Refer to PROBLEM SYMPTOMS TABLE |
| Multiplex tilt and telescopic ECU | Refer to REMOVAL | |
| Only auto return function does not operate | Smart access system with push button start function | Refer to PROBLEM SYMPTOMS TABLE |
| Multiplex tilt and telescopic ECU | Refer to REMOVAL | |
| Only memory function does not operate | Driving position memory switch | Refer to INSPECTION |
| Multiplex tilt and telescopic ECU | Refer to REMOVAL |
Factory Service Tools
Use the Manual With the Right Hardware
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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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