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.
Option Coding
- If there is any item indicated by the option coding after equipment change, set ETACS-ECU so that the option coding data corresponds with the equipment content. Functions and systems do not work normally if the setting does not correspond with the equipment.
- With the ETACS functions being customized, if any of the ETACS-ECU variant coding and option coding items are changed, the customized contents are reset. In such case, the functions need to be recustomized.
The ETACS-ECU option coding data can be checked or changed by operating scan tool MB991958.
- How to check option coding data
- Connect the scan tool MB991958. Refer to VARIANT CODING .
- Turn the ignition switch to the "ON" position.
- Select "System select" from the start-up screen.
- Select "From 2006 MY" under "Model Year". Check that "Vehicle Information" contents are correct.
- Select "ETACS" from "System List", and then press "OK" button.NOTE: If "Loading Option Setup" list is shown, click appropriate box.
- Select "Coding."
- Select "Option Coding Information."
- Check the displayed option coding information.
- How to change option coding data
- Connect the scan tool MB991958. Refer to VARIANT CODING .
- Turn the ignition switch to the "ON" position.
- Select "System select" from the start-up screen.
- Select "From 2006 MY" under "Model Year". Check that "Vehicle Information" contents are correct.
- Select "ETACS" from "System List", and then press "OK" button.NOTE: If "Loading Option Setup" list is shown, click appropriate box.
- Select "Coding."
- Select "Option Coding."
- Change to correct option coding data.ITEM LIST
Item name Cruise Control LIST <ETACS-ECU>
ITEM LISTItem name Number of speaker Seat material Auto light CNTL AUDIO (CAN) AND HFM (hands free-ECU) Rain Light Sensor Front fog light Rear fog light Horn type Remote engine starter Wiper washer check bulb Compressor type Satellite Radio Keyless Door Unlock Mode Customize AUDIO/S.RADIO type Manner switch DRL function Front wiper
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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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