This is to notify you of the Service Campaign Launch to retrofit the HERMES control unit in 17,546 Model Year (“MY”) 2021-2022 CLA-Class, A-Class, CLS-Class, E-Class, GLA-Class, GLB-Class, GLC-Class, and GLE-Class (118, 177, 213, 238, 247, 253, and 257 platform) vehicles. The vehicles will be visible and flagged in VMI as “OPEN” on April 29, 2022.
Mercedes-Benz AG (“MBAG”), the manufacturer of Mercedes-Benz, has determined that certain MY 2021-2022 CLA-Class, A-Class, CLS-Class, E-Class, GLA-Class, GLB-Class, GLC-Class, GLE-Class, and (118, 177, 213, 238, 247, 253, and 257 platform) vehicles were manufactured without the HERMES control unit, as disclosed to the vehicle purchaser at the time of sale. As a result, the Mercedes Me Connect services including the emergency call (“eCall”) function are currently not available.
What We’re Doing
MBUSA will conduct a service campaign. An authorized Mercedes-Benz dealer will retrofit the HERMES control unit to the vehicle and enable the Mercedes Me Connect functions on applicable vehicles.
The Remedy is available and can be performed as necessary. Parts will be VOR Only.
- Before starting the work procedure, install all the add-ons that are updated daily in XENTRY Diagnosis.
- Make sure to follow the operation steps exactly as described in XENTRY Diagnosis.
- Use a battery charger to ensure sufficient power supply of the vehicle on-board electrical system battery (greater than 12.5 V).
If two or more software updates or SCN codings are performed during a workshop visit, the operation items 02-4762 and 02-5058 may only be invoiced once for each workshop order.
- Retrofit HERMES control unit.
For basic data, see AR82.95-P-0019MFA for model 118, 177 and 247.
For basic data, see AR82.95-P-0019LWE for model 213 and 238.
For basic data, see AR82.95-P-0019LWX for model 253.
For basic data, see AR82.95-P-0019FR for model 257.
Work procedure is identical to “Replace HERMES control unit”. The old control unit can be disposed of.
- Connect XENTRY Diagnosis with USB cable.
- Perform commissioning in control unit for telematics services (HERMES).
To do this, select menu item “Quick test view – N112/9 control unit for telematics services (HERMES) –
Adaptations – Teach-in processes – Retrofitting of control unit ‘N112/9 control unit for telematics services (HERMES)'”.
Then follow the user guidance in XENTRY Diagnosis.
Several control units will be coded!
Clear out fault code memory after coding.
- Disconnect XENTRY Diagnosis.
- Remove masking sticker from SOS button of overhead control panel (figure 1).
- Perform function test.
6.1. Switch ignition to position 1. To do so, press start button once without touching the brake pedal.
6.2. Set head unit to radio menu and check whether SOS NOT READY appears (figure 2).
6.3. Switch ignition to position 2. To do so, press start button a second time without touching the brake pedal.
6.4. Check whether SOS NOT READY subsequently goes out automatically (figure 2).
- Remove supplement booklet ”Notes on vehicles without communication module” (A 000 584 50 15) if present.
- Activate Mercedes me connect services if the vehicle is customer owned.
It is recommended the Mercedes me connect services should be activated by the sales department using the Mmc Activation Best Practices. A separate NCU communication will be sent to the Sales Department informing them about the benefits of activating services.
Primary Parts Information
|Qty.||Part Name||Part Number|
|As required (1)||HERMES control unit, NAFTA (code 1B4)||A 238 900 91 01|
Retrofit HERMES Control Unit
Model Year 2021-2022
|CarDAQ-Plus – PassThru J2534 Vehicle Reflash Hardware|
|CarDAQ-M Modular PassThru J2534 Vehicle Reflash Hardware|
|VSI J2534 ECU Reprogrammer|
|Autel (AULMF2534) MaxiFlash Pro|
- Windows based PC or laptop*
- J2534 compliant interface box*1*
*Must be purchased from a third party company and are not available from Mercedes-Benz USA LLC.
*1* suggested listing of J2534 interface boxes is located within the J2534 Pass-Thru User’s Manual which is posted for view without cost under the MB Workshop Resources tab on the home page of www.startekinfo.com
J2534 complaint software for Mercedes-Benz vehicles has coverage for all required functions associated to reprogramming, initialization, and fault clearing of emission control modules (engine and transmission) fitted to vehicles 2004 Model Year and newer. Additionally all access and functionality required in regard the configuration via SCN Coding and/or CVN Coding is covered.
- All control unit software (reprogramming calibrations) is contained within J2534 DVD media.
Terms and conditions
J2534 complaint software for Mercedes-Benz vehicles is purchased in 1-year license increments. During that license term the user will receive an initial software package, license key, SCN/CVN Coding information/access as well as monthly updates via DVD media.
- Additional updates of software after the 1st year can be purchased at additional cost, however are not required for the system to continue functioning.
For pricing and additional information via the internet, please refer to the information at the beginning of this section.
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