30-001-21-3852

APPLICABLE MODEL(S)/VINS
2022 MX-30 with VINS lower than JM1DR**B***100475 (produced before October 20, 2021)
DESCRIPTION
Some customers may complain that the quick charging takes a longer time during the winter months. This is caused by a
low battery temperature. When the battery temperature is low, charging current is limited and results in increased
charging time. To eliminate this concern, the control software of the PCM and BECM have been modified to add a winter
mode which keeps the high voltage battery warmer.
Customers having this concern should have their vehicle repaired using the following repair procedure.
REPAIR PROCEDURE
1. Verify customer concern.
2. Reprogram the PCM and BECM (MHB in MDARS screen) with the Mazda Modular Diagnostic System (M-MDS),
using the Mazda Diagnostic And Repair Software (MDARS). Refer to MDARS ECU Reprogramming Procedure.
NOTE: If the current calibration file name in the ECU FILENAME screen is the same as shown in the Calibration Files
Information or with a later suffix, reprogramming is not necessary.
3. Clear the DTC, turn the ignition off, and get out of the vehicle.
4. Close and lock the door.
5. Wait for at least ten minutes.
6. Verify the repair by turning the power ON (READY on) and making sure no abnormal warning lights are ON.
NOTE: If any DTC should remain after performing a DTC erase, diagnose the DTC according to the instructions on
MGSS.
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WINTER MODE CHARGING
NOTE: When using the winter mode, the battery heater operates earlier than usual even with the power OFF to help
keep the battery warmer. As a result, the next time when turning the power ON (READY on), the distance to full
discharge may be shorter than expected and the high voltage battery level may be lower than expected.
Entering and exiting the winter mode
NOTE: Once the vehicle is in winter mode, it does not need to be changed back to normal mode.
1. Turn the power ON (READY off).
2. Shift into Park.
3. Press and hold both the brake and accelerator pedals and operate the following steps (a-d) sequentially within 10
seconds.
a. Operate the minus switch (1) of the steering wheel paddle 3 times.
b. Operate the plus switch (2) of the steering wheel paddle 3 times.
c. Operate the minus switch (1) of the steering wheel paddle 3 times.
d. Operate the plus switch (2) of the steering wheel paddle 3 times.
NOTE: After completion of step 1 through 3, the EV system problem warning light flashes.
• Entering the winter mode: flashes 4 times
• Entering the normal mode/exiting the winter mode: flashes 2 times
4. Release the both brake and motor pedals and turn the power OFF.
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CALIBRATION
ECU
File Name
PCM
MH08-186K2-J
BECM (MHB)
MH01-30YF2-F
WARRANTY INFORMATION
NOTE:
• This warranty information applies only to verified customer complaints on vehicles eligible for warranty repair.
• This repair will be covered under Mazda’s New Vehicle Limited Warranty term.
• Additional diagnostic time cannot be claimed for this repair.
Warranty Type
A
Symptom Code
20
Damage Code
9W
Part Number Main Cause
Quantity
Operation Number / Labor Hours:
5555-18-881
1
XXT85XFX / 0.3 Hrs.
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