News Channel Update |

Vehicle Compliance & Analysis

TO: Mercedes-Benz Dealer Principals, General Managers, FROM: Gregory Gunther, Senior Manager, Vehicle
Sales Managers, Service Managers, Parts Managers
Compliance and Analysis, Engineering Services
RE: Service Campaign Launch Notification
Update Integrated Starter Alternator (ISA)
DATE: May 3, 2024
Control Unit Software
MY21-23 C-Class, S-Class (206, 223 platform)

IMPORTANT SERVICE CAMPAIGN LAUNCH

Please note that all customer inquiries should be directed to the Customer Assistance Center at 1-800-FORMERCEDES (1-800-367-6372).

Sincerely,
Gregory Gunther
Senior Manager, Vehicle Compliance & Analysis

Mercedes-Benz USA, LLC
One Mercedes-Benz Drive

A Mercedes-Benz Group AG Company

Sandy Springs, GA 30328

770.705.0600

News Channel Update |

Vehicle Compliance & Analysis

Service Campaign Launch Notification
Campaign No. :

Campaign Desc. :

2024040008

23P5498612

May 3, 2024

Update Integrated Starter Alternator (ISA) Control Unit Software

This is to notify you of the Service Campaign Launch to update the Integrated Starter Alternator (ISA) control unit software in
29,524 Model Year (“MY”) 2021-2023 C-Class and S-Class vehicles (206, 223 platform). The vehicles will be visible and flagged in
VMI as “OPEN” on May 3, 2024.

Background
Mercedes-Benz AG, the manufacturer of Mercedes-Benz vehicles, has determined that on
certain MY21-23 C-Class and S-Class vehicles (206, 223 platform), the software for the ISA
control unit may not correspond with the latest series production configuration. The
possibility exists that the function of the ISA may not be restricted with an active Malfunction
Indicator Lamp.

Issue

What We’re Doing

MBUSA will conduct a service campaign. An authorized Mercedes-Benz dealer will update
the ISA control unit software in the affected vehicles.

Parts

The remedy is available and can be performed as necessary.

Vehicles Affected
2021-2023
C-Class, S-Class

Vehicle Model Year(s)
Vehicle Model

Vehicle Populations
Total Campaign Population

29,524

Next Steps/Notes
Customer Notification Timeline

Customer letters will not be mailed.

AOMS/SOMS

AOMs – This campaign may generate questions from your dealers.

While we regret any inconvenience this may cause, MBUSA is determined to maintain a high level of vehicle quality and customer
satisfaction. Please refer all customer inquiries to the Customer Assistance Center at 1-800-FOR-MERCEDES.

Mercedes-Benz USA, LLC
One Mercedes-Benz Drive

A Mercedes-Benz Group AG Company

Sandy Springs, GA 30328

770.705.0600

2

Campaign No. 2024040008, May 2024

TO:

ALL MERCEDES-BENZ CENTERS

SUBJECT:

Model C-Class and S-Class (206 and 223 platform)
Model Year 2021 – 2023
Update Integrated Starter Alternator (ISA) Control Unit Software

Mercedes-Benz AG, the manufacturer of Mercedes-Benz vehicles, has determined that on certain
MY21-23 C-Class and S-Class vehicles (206 and 223 platform), the software for the ISA control
unit may not correspond with the latest series production configuration. The possibility exists that
the function of the ISA may not be restricted with an active Malfunction Indicator Lamp. An
authorized Mercedes-Benz dealer will update the ISA control unit software in the affected vehicles.

Prior to performing this Campaign:


VMI must be checked before performing campaigns to verify that the campaign is required on
a specific vehicle. Always check for any other open campaigns and perform accordingly.



Please review the entire Campaign bulletin and follow the repair procedure exactly as
described.

Approximately 29,524 vehicles are affected.
Order No. P-SC-2024040008

2

Update Integrated Starter Alternator (ISA) Control Unit Software
 Always use the latest XENTRY Diagnosis software release with all available add-ons.
 Follow the operation steps exactly as described in XENTRY Diagnosis.
 Use a charger to ensure sufficient power supply to the vehicle’s on-board electrical system battery
(greater than 12.5 V).
 If XENTRY Diagnosis is already connected to the vehicle, start with Work Procedure Step 2.
If two or more software updates or SCN codings are performed during a single workshop
visit, operation items 02-4762 and 02-5058 may be invoiced only on one of the workshop orders.

Work Procedure
1. Connect XENTRY Diagnosis.
2. Update ISG48V2 - N129 or A79/8 Integrated starter alternator (ISA) control unit software.
To do this, select menu item "Quick test view → N129 - Integrated starter alternator (ISA), or A79/8 - Integrated
starter alternator (ISA) → Adaptations → Control unit update → Update of control unit software".
Then follow the user guidance in XENTRY Diagnosis.

3. Disconnect XENTRY Diagnosis.
__________________________________________________________________________________________________
Note: The following allowable labor operation should be used when submitting a warranty claim for this repair:
Warranty Information
Damage

Operation

Code

Number

54 986 12

Description

Labor Time
(hrs.)

02-9334

Update ISG48V2 (N129 or A79/8) Integrated starter alternator (ISA) control
unit software (with XENTRY Diagnosis connected)

0.1

02-4762*

Connect/disconnect diagnostic system
(XENTRY Diagnosis)

0.1

02-5058*

Connect/disconnect starter battery charger
(with XENTRY Diagnosis connected)

0.1

* Invoice operation items only on one of the workshop orders, if two or more software updates or SCN codings are
performed during a single workshop visit.
Note: Always check Xentry Operation Time (XOT) for the current OP-Code times. Labor times are subject to change
and updates may not be reflected in this document.

P-SC-2024040008