NHTSA ID Number: 11024394
Manufacturer Communication Number: NTB25-044
TSB/Document Date: 2025-10-21
Summary
PROCESS FOR 12V BATTERY TESTING APPLIED VEHICLES: 2026 LEAF (ZE2) SERVICE INFORMATION Due to changes to the DC-DC control logic, 12V battery testing may take an extra 20 minutes or more. To perform a faster 12V battery test, the DC-DC deactivation process must be completed which deactivates the DC-DC power supply for 1 hour. The 12V battery must be diagnosed or removed within 1 hour or power supply may be restored unintentionally. The DC-DC deactivation process is in the Electronic Service Manual (ESM) under Precautions for Removing Battery Terminal. · Refer to the ESM: ELECTRICAL & POWER CONTROL > POWER SUPPLY, GROUND & CIRCUIT ELEMENTS > PRECAUTION > PRECAUTIONS FOR REMOVING BATTERY TERMINAL > Precautions for Removing Battery Terminal · If the 12V battery is not replaced after testing, verify the power switch has been pressed to cycle the ignition to ACC mode ON and then back to ACC mode OFF to re-enable the DC-DC system which maintains the 12V battery.
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TSB/Document ID: NTB25-044
Replacement Service Bulletin Number:
MFR Communication Date: 2025-10-02
MFR Internal Campaign ID/Software Version: EL25-009
Communication Type: Service Bulletin/Repair Instructions
NHTSA Components: ELECTRICAL SYSTEM
MFR Component System:
MFR Component Subsystem:
Previous TSB | Next TSB |
Classification:
Reference:
EL25-009
Date:
NTB25-044
October 2, 2025
PROCESS FOR 12V BATTERY TESTING
APPLIED VEHICLES:
2026 LEAF (ZE2)
SERVICE INFORMATION
Due to changes to the DC-DC control logic, 12V battery testing may take an extra 20
minutes or more. To perform a faster 12V battery test, the DC-DC deactivation process
must be completed which deactivates the DC-DC power supply for 1 hour. The 12V battery
must be diagnosed or removed within 1 hour or power supply may be restored
unintentionally. The DC-DC deactivation process is in the Electronic Service Manual (ESM)
under Precautions for Removing Battery Terminal.
•
Refer to the ESM: ELECTRICAL & POWER CONTROL > POWER SUPPLY,
GROUND & CIRCUIT ELEMENTS > PRECAUTION > PRECAUTIONS FOR
REMOVING BATTERY TERMINAL > Precautions for Removing Battery
Terminal
•
If the 12V battery is not replaced after testing, verify the power switch has been
pressed to cycle the ignition to ACC mode ON and then back to ACC mode OFF
to re-enable the DC-DC system which maintains the 12V battery.
AMENDMENT HISTORY
PUBLISHED DATE REFERENCE
October 2, 2025
NTB25-044
DESCRIPTION
Original bulletin published
Bulletins are intended for use by qualified technicians, not 'do-it-yourselfers'. Qualified technicians are
properly trained individuals who have the equipment, tools, safety instruction, and know-how to do a job
properly and safely. NOTE: If you believe that a described condition may apply to a particular vehicle, DO
NOT assume that it does. See your Nissan
dealer to determine if this applies to your vehicle.
1/1
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