TECHNICAL SERVICE OPERATIONS

MAS003406 MTB 22-34
TECHNICAL INFORMATION
FROM: Maserati TSO
TO: Maserati Network

Best Practices for Grecale 12 Volt Battery
management and diagnosis
DATE: DECEMBER 30 2022
MODELS: Grecale M182
SECTION: 08.20-1 Energy generation and accumulation
This technical bulletin provides information regarding the correct management and diagnosis of the
Grecale 12 Volt Battery. Below are the main topics discussed in this release:
1.
2.
3.

Battery Check at PDI
Correct battery management during PDI Inspection and In-stock period
Diagnostic checklist for a “Dead Battery” concern

1. Battery Check at PDI
Starting with Grecale, Maserati introduced and announced the new model introduction circular letter
(MAS003281) and the management of vehicles in stock instructions (MAS003377), a new important check
to be done during PDI at the dealer.
This check requires measuring the 12V battery voltage (at PDI) directly at the battery posts with a digital
multimeter after disconnecting the negative quick connector and before connecting any charger or
maintainer.
Due to the intricate technology used in the Grecale, the 12V battery voltage must be maintained equal to
or greater than 12.5V. However, if the battery voltage measures below 12.5V but is over 12.1V, the battery
must be completely recharged.
If the voltage measures less than 12.1V it must be replaced and authorized in cost code 12 by opening a
BOL as “Support Request "and attaching the following 3 items:
i. Picture of digital multimeter showing Battery Voltage (Negative Cable Disconnected, see
above)
ii. Picture of the Battery Label including QR code and PN found on top of the battery
iii. BCM only, Parameter & DTC Report via EVO (*Connect battery charger if needed in case of
low battery voltage to obtain EVO report)
As requested by circular letter MAS003377, this battery Voltage value must be recorded during PDI, on the
“CHECKLIST FOR LONG-TERM OPERATIONS” at month 0 record.
NOTE: The required open-load battery voltage measured with a digital multimeter value is not to be
confused with the value shown by MDEVO during the Logistics mode removal procedure, this value is
subject to a voltage drop induced by the absorption of the car with the ignition ON.

© 2022 Maserati Americas
Aftersales
www.maseratiusa.com

MAS003406

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

1

Due to the new electronic architecture and the high number of control units installed in the Grecale, the
electrical current absorption can be higher than 25 Amps with the ignition ON. Therefore, when using the
MDEVO connected to the vehicle with the ignition ON engine OFF, it is mandatory to use a battery
charger capable of guaranteeing an adequate and constant recharge current no lower than 25 Amps.
To ensure correct maintenance of the battery during in-stock storage period, we remind you to follow the
instructions provided in circular letter MAS003377 “Management and maintenance of Maserati vehicles in
stock” and to record the open-load battery voltage value in the checklist (CHECKLIST FOR LONG‐TERM
OPERATIONS) at month 0 and every subsequent scheduled checking interval.
For optimal performance and reliability of the 12 Volt Battery, the removal and enabling of the logistics
mode using the EVO is linked to a preliminary check of the battery state of charge monitored by the BCM
from the data received by the IBS sensor. The minimum state of charge required to enable Logistics Mode
removal is 80%.
This operation must be performed possibly within 48 hours before the expected delivery date to the final
customer, recording the final battery voltage value measured with a multimeter on the PDI Checklist Section 7.

3. Diagnostic checklist for a “Dead Battery” concern
To be performed ONLY after the vehicle has been sold and or AFTER PDI has been performed
and vehicle stored for a long time.
To speed up the investigation of the potential root cause and the authorization to replace the 12 Volt
battery, we ask you to complete the attached CUSTOMER USAGE AND ROAD ASSISTANCE INFORMATION
QUESTIONNAIRE and or the DIAGNOSTIC CHECKLIST (Attachments: PAGES 1 and 2) and attach it to the
“Support Request” Blue Online (BOL).
IMPORTANT: the disconnection of the battery on connected (Active Maserati Connected Service) vehicles
generate the activation of the "STOLEN” mode by the TBM with a parasitic draw of approximately 150 mA
for 8 hours after the battery has been re-connected. It is important to prevent this from occurring when
performing a parasitic draw test. Because of this, we suggest that you follow the below procedure when
diagnosing a vehicle with a suspected excessive parasitic draw:
NOTE: Refer to the attached PARASITIC DRAW TEST (Attachments: PAGE 3) for detailed instructions and to
record the results.
1)
2)
3)
4)
5)
6)
7)
8)
9)
10)
11)

No codes in ANY module
12V Battery adequately charged (12.5V or above)
All doors closed the exception of the rear trunk/Tailgate
Interior and exterior lights must be OFF
All Keys out of detection range (more than 16 FT)
The rear Trunk opened, and the latch manually closed
No electronic device connected to USB ports or OBD connector
Lock the car with the key fob and remove it from the detection range (more than 16 FT)
Wait at least 30 minutes (Vehicle Sleep Mode)
Use a digital multimeter and connect leads to the negative battery post and a clean chassis ground
Disconnect the quick connector of the negative battery cable while keeping both the multimeter leads
connected to the negative battery post and chassis ground

"Lab OP -0.20.001.5 --> BOL Supplementary diagnosis level 4: 2.0h can be claimed for
performing diagnostic checklist"

© 2022 Maserati Americas
Aftersales
www.maseratiusa.com

MAS003406

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

2

TECHNICAL SERVICE OPERATIONS

2. Correct battery management during the pre-delivery inspection
and vehicles in stock

TECHNICAL SERVICE OPERATIONS

ATTACHMENTS – 12VOLT BATTERY DIAGNOSTIC CHECKLISTS

PAGE 1
CUSTOMER USAGE AND ROAD ASSISTANCE INFORMATION QUESTIONNAIRE
(Checklist to be filled out by dealer if customer experienced a “Dead Battery” event)
ROAD ASSISTANCE INFORMATION
Has a jump starter been used?

YES

NO

Battery cables attached to the battery post loose?

YES

NO

Vehicle doors were closed/locked?

YES

NO

Did the car open using the remote (Key FOB)?

YES

NO

Did the customer notice any malfunctions when the battery was discharged?
(e.g Malfunction warning indicators lights or messages in the cluster)

YES

NO

CUSTOMER INTERVIEW

If yes, which ones
(Describe in detail)
Has the car recently been moved or has been parked for many days?
(indicate days or hours).
How many miles per day does the customer travel on average?

Miles
City
City & Highway
Highway

Type of route used most
frequently (insert flag)
Does the customer usually use the radio at KEY OFF?

YES

NO

After the KEY OFF, does the customer leave electrical external devices connected (USB or
12V devices)?

YES

NO

YES

NO

If yes, which ones
(Describe in detail)

Were there valid keys in the car?
How far away from the car were the keys outside the vehicle?
Is a GPS tracker or other aftermarket KIT installed on the car?

FT
YES

NO

If yes, which ones
(Describe in detail)

© 2022 Maserati Americas
Aftersales
www.maseratiusa.com

MAS003406

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

3

DIAGNOSTIC CHECKLIST
To be performed ONLY after the vehicle has been sold and or AFTER PDI has been performed and vehicle
stored for a long time.
ATTENTION! DO NOT DISCONNECT BATTERY CABLES OR IBS (until completion of the checklist)
the disconnection of the battery on connected (Active Maserati Connected Service) vehicles generate the
activation of the "STOLEN” mode by the TBM with a parasitic draw of approximately 150 mA for 8 hours after
the battery has been re-connected
Provide the open load battery voltage value detected while taking charge of the new
vehicle by the dealer (attach the CHECKLIST FOR LONG‐TERM OPERATIONS)

Volt

Provide the Battery Voltage value detected at the end of the PDI process
(attach the PDI Checklist)

Volt

Provide the Battery Picotest report (in pdf format) performed at vehicle entry
NOTE: The test must be performed by connecting probes directly on the battery post and starting it with
ignition OFF
If the vehicle is in PDI, indicate how many days it has been in stock and how often the
battery check and recharge procedure has been performed. Attach CHECKLIST FOR
LONG‐TERM OPERATIONS per bulletin MAS003377
Check for the presence/ installation of any
aftermarket device (GPS tracker, alarm).
If present indicates brand/model and attaches
pictures of the device and related installation

Brand/model:
YES

NO

Battery post terminals are free of corrosion or mechanical anomalies?

YES

NO

Are battery post terminals loose?

YES

NO

LOGISTIC MODE

YES

NO

CUSTOMER MODE

YES

NO

YES

NO

Check Battery PN and attach a picture of the
label on the upper cover

PN:

Check the Battery production date attaching a
picture of the hot printed code on the upper
cover

Code:

The battery flat event happened with the car in
Logistic mode or Customer mode?

Check the position of the external lights selector (auto, manual) and if the lights stayed on
Check the radio power off delay, indicating minutes (3,6 or 12 min selectable from MIA)

min

Updated ECUs:
Check for SW updates previously performed on
the vehicle.

YES

NO

Attach a complete vehicle scan report (in pdf format) including DTCs and Parameters

© 2022 Maserati Americas
Aftersales
www.maseratiusa.com

MAS003406

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

4

TECHNICAL SERVICE OPERATIONS

PAGE 2

PARASITIC DRAW TEST
ATTENTION! the disconnection of the battery on connected (Active Maserati Connected Service) vehicles
Activates the “STOLEN” mode by the TBM with a parasitic draw of approximately 150 mA for 8 hours after the
battery has been re-connected. To prevent this, follow the procedure below.

12V Battery Preconditions:
If the outcome of the battery test indicates that the battery needs to be re‐charged, carry out a complete
charging cycle. Attach a picture of the battery charger display at the beginning and end of charging.
(If possible, add also picture after 3 hours of charging)
(In case of usage of no smart charger, the re-charging will have to last at least 8 hours)

Parasitic Draw Preconditions:
1)
2)
3)
4)
5)
6)
7)
8)

No codes in ANY module
12V Battery adequately charged (12.5V or above)
All doors closed the exception of the rear trunk/Tailgate
Interior and exterior lights must be OFF
All Keys out of detection range (more than 16 FT)
The rear Trunk opened, and the latch manually closed
No electronic device connected to USB ports or OBD connector
Lock the car by the key fob and remove it from the detection range
(more than 16 FT)
9) Wait at least 30 minutes (Vehicle Sleep Mode)
10) Use a digital multimeter and connect leads to the negative battery
post and a clean chassis ground
11) Disconnect the quick connector of the negative battery cable while
keeping both the multimeter leads connected to the negative
battery post and chassis ground

© 2022 Maserati Americas
Aftersales
www.maseratiusa.com

MAS003406

Record the results every 30 min up
to 90 minutes below:

1) 30 min_______mA
2) 60 min_______mA
3) 90 min_______mA

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

5

TECHNICAL SERVICE OPERATIONS

PAGE 3