RAPID UPDATE
FROM: Maserati TSO
TO: Maserati Network

Rapid Update 791
M189 – Electric Absorption Improvement
BCM – RFHM – SLML – SLMR Software Updates

DATE: June 25 2025
Certain Maserati GranTurismo GranCabrio (M189) MY24 MY25 listed in MODISCS+ are involved in
a Rapid Update that involves software updates to multiple modules.
This electric absorption improvement can be reached by updating the following modules
during the same intervention:
•
•
•
•

BCM (Body Control Module)
RFHM (Radio Frequency HUB Module)
SLML (Smart Lighting Module Right)
SLMR (Smart Lighting Module Left)

We remind you that all the Rapid Updates must be performed within the first workshop visit,
regardless of the Mandatory setting set in Modis, as required by Maserati policies.
Also, for vehicles in Stock Dealer / PDI, it is necessary to carry out all action operations before
delivery to the end customer, as required by the White Book and explicitly reported in the Predelivery checklist.
Please read and review this bulletin first before ordering parts and/or starting the procedure.
Contact your Regional AfterSales Manager (RAM) or the Technical Support Helpdesk if you
have any questions.
Thank you for your continued support and cooperation.
Maserati North America
Aftersales Dept.

© 2025 Maserati North America
Aftersales
www.maseratiusa.com

MAS004778

All rights reserved. Reproduction or translation in
whole or in part is not permitted without
authorization from the publisher. Printed in USA

Page 1 of 2

TECHNICAL SERVICE OPERATIONS

MAS004778 RU 25-15

1.

Always check ModisCS+ to see if the vehicle is involved in this action and if it has not been previously
performed.

2.

Before proceeding, please ensure that the Engine is OFF.

3.

Connect a battery maintainer to the 12V battery (It is recommended to always use the
E-XTEQ MAXIMUS to maintain minimum voltage and current draw requirements.

4. Connect the EVO to the vehicle, ensure that battery voltage is around 12.5V, then select the following
modules and perform the software updates following the prompts:
From ECU View, select the BCM – ECU programming
From ECU View, select the RFHM – ECU programming
From ECU View, select the SLML – ECU programming
From ECU View, select the SLMR – ECU programming

•
•
•
•

Software version to be installed (or newer).
ECU

F188 Target

BCM

670354211

RFHM

670353736

SLML
+
SLMR

670355878

5.

After ECU programming, perform BCM – Procedures – PROXI Alignment.

6.

After the PROXI alignment, only for BEV vehicles, please follow the following operations:
▪

Close the MDEVO application and disconnect the MDVCI2

▪

Disconnect the 12V Battery Maintainer from the 12V Battery

▪

Perform the Key OFF

▪

Make sure that the bonnet, the trunk, and all the doors are properly closed.

▪

Wait for the power latch (wait until the dashboard clock turns off)
NOTE: Allow the car to sleep for ten minutes

▪

Reconnect the 12V Battery Maintainer to the 12V Battery

▪

Perform the Key ON

▪

Reconnect the MDVCI2, restart the MDEVO application, and clear DTCs from the ECU View.

7.

Perform the Ignition Cycle (Key OFF and Key ON)

8.

Procedure complete.

Fill in the relevant Warranty Claims as follows:

Description

Code

Number

791

Warranty Code

23

Fault Code

063

Component Code
Operation Code

© 2025 Maserati North America
Aftersales
www.maseratiusa.com

MAS004778

9.99.000
9.99.000.A (0,40h)

All rights reserved. Reproduction or translation in
whole or in part is not permitted without
authorization from the publisher. Printed in USA

Page 2 of 2

TECHNICAL SERVICE OPERATIONS

Technical Procedure