Technical Information
FROM: Maserati TSO
TO: Maserati Network

Grecale & Granturismo 12 Volt Battery Best
Practices
DATE: March 6, 2024
MODELS: Grecale M182 (MY23+), GranTurismo/Grancabrio M189 (All MY)
SECTION: 08.20-1 Energy generation and accumulation

This Technical bulletin serves as a guide and provides additional diagnostic info of the 12V Battery.

1. 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 the vehicle has been 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
generates 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)

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 10 minutes (Vehicle Sleep Mode)
Use a digital multimeter and connect leads to the negative battery post and 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"

© 2024 Maserati North
America. Aftersales
www.maseratiusa.com

MAS003833

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 4

TECHNICAL SERVICE OPERATIONS

MAS003833 MTB 24-15

TECHNICAL SERVICE OPERATIONS

PAGE 1: ATTACHMENTS – 12 VOLT BATTERY DIAGNOSTIC CHECKLISTS
CUSTOMER USAGE AND ROAD ASSISTANCE INFORMATION QUESTIONNAIRE
(Checklist to be filled out by dealer if customer experienced a “Dead Battery” event)
ROAD ASSISTANCE INFORMATION
Was the vehicle Jump Started?
Battery cables attached to the battery posts loose?

YES

NO

YES

NO

QUESTIONNAIRE FOR THE CUSTOMER
Where was the vehicle Parked at the time of battery discharge?
Vehicle doors closed/locked?

YES

NO

Did the vehicle open using the Key FOB?

YES

NO

YES

NO

YES

NO

Has the customer noticed that the digital clock, comfort display, or backlighting of the
instrument cluster comes on when the car is closed?
Did the customer notice any malfunctions when the battery was discharged?
(e.g., Malfunction warning indicators lights or messages in the cluster)
If yes, which ones
(Describe in detail)
check with the customer whether Customer Feedback:
the car may have erroneously been
left with the ignition ON (Refer to
MAS003511)
Vehicle recently been moved, or has been parked for an
extended period of days?

If YES, how many Days/Hours

NO

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

YES
YES

NO
NO

Were the key FOBs left in the vehicle?
How far away from the vehicle were the key FOBs outside the vehicle?

YES

NO

GPS tracker or other aftermarket KIT installed on the car?

YES

If YES, which ones
(Describe in detail)
FT
NO

If yes, which ones
(Describe in detail)
Was the car left with the parking lights on?

YES

NO

Connected Services Subscription Activated?

YES

NO

Has the customer noticed the engine cooling fan turning ON with the engine OFF?

YES

NO

Was the vehicle washed or exposed to rain before the discharge event?

YES

NO

What features or APPs of the radio did the customer use before the discharge event?

© 2024 Maserati North
America. Aftersales
www.maseratiusa.com

MAS003833

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 4

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 generates 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 12V battery value recorded during PDI (attach the PDI checklist)
Provide an E-XTEQ Battery test printout performed at vehicle entry.
Check the status of the following Rapid update actions upon entry of the vehicle:

Volts

(Circle “N/A” if the RU does not apply to the VIN)

Rapid Update 597

N/A

Done

Not Done

Rapid Update 599

N/A

Done

Not Done

Rapid Update 605

N/A

Done

Not Done

Rapid Update 622

N/A

Done

Not Done

Rapid Update 623

N/A

Done

Not Done

Check for the presence/ installation of any aftermarket devices (GPS
tracker, alarm). If present, indicate brand/model and attaches
pictures of the device and related installation

Brand/model:

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

Code:

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

PN:

Did the Flat battery event occur while in Logistic Mode or Customer
Mode?

Logistic Mode

YES

NO

YES

NO

Battery post terminals free of corrosion or mechanical anomalies?

YES

NO

Are the battery post terminal secure and not loose?

YES

NO

Are SW updates available?

YES

NO

Check the position of the external lights selector (auto, manual) and if the lights stay ON.

YES

NO

Customer Mode

Check the radio power off delay, indicating in minutes (3,6, or 12min selectable in the MIA

min

MANDATORY: Attach a complete vehicle scan (DTC and Parameter) report of ALL modules
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, including
the final printout.
If the car 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

© 2024 Maserati North
America. Aftersales
www.maseratiusa.com

MAS003833

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

Page 3 of 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, also add a 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)

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)
8) Wait at least 10 minutes (Vehicle Sleep Mode)
9) Use a digital multimeter and connect leads to the negative battery
post and a clean chassis ground
10) Disconnect the quick connector of the negative battery cable while
keeping both the multimeter leads connected to the negative
battery post and chassis ground

© 2024 Maserati North
America. Aftersales
www.maseratiusa.com

MAS003833

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

Page 4 of 4

TECHNICAL SERVICE OPERATIONS

PAGE 3