BULLETIN NOTES
This Service Alert supersedes the previously issued SA(s) listed below. The changes are noted in Red.
Previous SAs:

Date(s) Issued:

SA-020/24

09/10/24, 04/23/24 and 03/19/24

SA-017/23

11/06/23, 09/14/23, 08/28/23, 07/24/23, 06/09/23, 05/24/23, 05/15/23 and 03/27/23

APPLICABLE MODEL(S)/VINS
2025 CX-70
2024-2025 CX-90
DESCRIPTION
The CX-70 and CX-90 have new and revised features that are different from previous models and may be difficult to
understand. This Service Alert provides valuable information to support potential dealer and customer concerns.
Index

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PDI fuse
Key Transmitter and Auxiliary Key
Immobilizer (Code Word)
Theft-Deterrent System
High Voltage
Mazda M Hybrid Boost
Plug-In Hybrid Electric Vehicle (PHEV)
High Voltage Battery Service Cautions
High Voltage Battery Maintenance
PHEV 355V High Voltage Shutdown Before Service
M Hybrid Boost 48V High Voltage Shutdown Before Service
High Voltage Battery Replacement
Back Up Sub Battery for e-SKYACTIV PHEV
PHEV Refueling Procedure
PHEV Instrument Cluster Battery Range
PHEV interfere with flat lift
PHEV 355V and M Hybrid Boost 45V Electric Fan Service Caution
Engine Coolant Drain Location
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PHEV 355V HVAC Compressor Oil
Engine Oil Level Measurement (Infotainment Center Display)
FR-8EAT(Front Engine Rear Drive-8 Electrical Automatic Transmission)
Transfer Case for All-Wheel Drive
i-stop
12V Battery Charging / Testing
i-ACTIVSENSE
i-ACTIVSENSE Indicators
Smart Brake Support (SBS)
Forward detection function
Turn-Across Traffic
Front Crossing
Intersection accident avoidance assist function
Rearward detection function
Rear Crossing
Secondary Collision Reduction
Mazda Radar Cruise Control with Stop & Go Function System (MRCC)
Speed Limit Assist
Cruising & Traffic Support (CTS)
Cruising and Traffic Support- Risk Mitigation Function (CTS-RMF) (CX-70 only)
Distance & Speed Alert (DSA)
Lane-Keep Assist System
Lane Departure Warning System (LDWS)
Emergency Lane Keeping (ELK)
Road Keep Assist
Blind Spot Assist
Head-on traffic avoidance assist
High Beam Control System (HBC)
Blind Spot Monitoring (BSM) System
Vehicle Exit Warning
Front Cross Traffic Alert (FCTA) System
Rear Cross Traffic Alert (RCTA) System
Driver Attention Alert (DAA) System
Driver Monitoring (DM)
Private e-call (Canada Only) (CX-70 only)
Traffic Sign Recognition System (TSR)
360° View Monitor System
Trailer Hitch View (CX-70 only)
Driver Personalization System
Connected Vehicle
MyMazda App Remote Engine Start
Mazda Connected Vehicle Viewer (MCVV)
Mazda intelligent Drive Select (Mi-Drive)
Hill Descent Control
AUTOHOLD
Hill Launch Assist (HLA)
Kinematic Posture Control (KPC)
Liftgate Lens Illumination
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Power Liftgate Hands-free function
Remote Power Window
Electric Parking Brake (EPB)
MAZDA CONNECT
MAZDA CONNECT Power Function
Alexa Built-In (CX-70 only)
Mazda Online Navigation (CX-70 only)
Wireless Apple Carplay™ / Android Auto™
Wireless Qi Charger
USB Type C Flash Drive
Transmitter Battery Saving Function
Occupant Comfort
Rear Seat Alert
Maintenance Mode
Connected Vehicle Maintenance Mode
Engine Maintenance Mode
Front Wiper Service Position
Rear Brake Maintenance Mode
PHEV 355V High Voltage Shutdown Before Service
M Hybrid Boost 48V High Voltage Shutdown Before Service
Web-Based Training Courses
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Item

Service Information

Fuse to be Installed at PDI
Fuse F1 (25A) is removed from the engine compartment drivers
side fuse block.
NOTE:

Fuse Block (Engine Compartment Drivers Side)

• Make sure the fuse is fully installed into position and flush
with all of the other fuses.
• Check for the Connected Vehicle signal after installing fuse
F1. The connectivity signal bar looks like a vertical stack bar
on the bottom right corner of the screen and should be white
as shown below to be working properly. This bar is
not displayed on the "Home" screen, but on
the "Entertainment" or "Navigation" menu.

• The following instrument cluster error messages may appear
prior to PDI completion. The error messages will clear after
fuse F1 is installed.
In-Vehicle Network Malfunction. Have the Vehicle Inspected

Driver Attention Alert Disabled

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Key Transmitter and Auxiliary Key
Vehicles arrive at the dealer with auxiliary keys and key transmitters
located in the front cup holders.

SA-016/23
Temporary Lost Key Procedure
See Owner's Manual -> Opening/closing -> Key
Except CX-50, CX-70, CX90, 5 digit key code

CX-50, CX-70, CX-90, 4 digit
key code and a plastic bar
code tag

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• Disgard the plastic bar code tag during PDI. The plastic bar
code tag is used during vehicle production and is not needed
by the customer.
• If additional auxiliary metal keys are needed, the key
machine will require a 5-digit code. Just add “5” as the 1st
digit to make the 4-digit to 5-digit.
The auxiliary keys need to be inserted into the key transmitters
during PDI.
Remove the transmitter lower
cover by sliding the knob in
the direction shown and then
sliding the cover in the
opposite direction.

Insert the auxiliary key.

Install the transmitter lower
cover by inserting the tabs of
the lower cover into the slots
of the transmitter.

Transmitter Note:

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• If one transmitter is lost, inform the customer to take cautions
not to lose the 2nd transmitter.
• If both transmitters are lost, the vehicle will be disabled
and MDARS will need to be used to program new
transmitters.
• Replacement battery type is CR2032 (3V, 225mAh), which is
different then previous 6th generation transmitter battery type
CR2025 (3V, 160mAh). If the wrong battery is installed, the
transmitter might not work properly (malfunction).

When a CX-70, CX-90 VIN is input into the Immobilizer
(Code Word application you will have two Out Code fields
Outcode #1 and Outcode #2 from MDARS should be
entered in these fields.

Immobilizer (Code Word)
CX-70, CX-90 have 32 character immobilizer in and out codes (2
sets of 16 characters).

Once retrieved, there will be an "Incode1" and "Incode2"
that will need to be entered into MDARS.

Theft-Deterrent System
If the theft-deterrent system detects an inappropriate entry into the
vehicle, which could result in the vehicle or its contents being
stolen, the alarm alerts the surrounding area of an abnormality by
sounding the horn and flashing the hazard warning lights.

Owner's Manual -> Opening / Closing -> Security System
> Theft-Deterrent System

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The system will not function unless it's properly armed. So when
you leave the vehicle, follow the arming procedure correctly.
MGSS -> Mazda M Hybrid Boost

Mazda M Hybrid Boost (Inline 6 cylinder)
M hybrid boost uses kinetic energy generated during deceleration to
charge the M hybrid boost battery which generates power using a
motor with excellent power generation efficiency. Using the
electrical power stored in the M hybrid boost battery, a highcapacity storage battery, contributes to improved driving
performance and fuel economy by reducing engine load and
performing motor assist. In addition, restarting the engine from the
istop status using the motor achieves quiet performance.
1. Vehicle Front
2. Motor
3. M hybrid boost battery (48 volts LiB Pack)
4. DC-DC Converter (M Hybrid Boost)
MGSS -> EV SYSTEM OUTLINE

Plug-In Hybrid Electric Vehicle (PHEV) System Outline (Inline 4
cylinder)
• The motor is integrated between the longitudinal engine and
the transmission, and a two-clutch, one-motor parallel hybrid
system that transmits drive force through the clutch has been
adopted.
• A plug-in hybrid system that can be can be recharged from
an external power source has been adopted

1. Lead-acid Battery
2. Engine
3. Motor

4. Transmission
5. Sub-battery
6. PCM
7. High voltage (for drive) battery (355 volts LiB Pack)
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8. BECM
9. Charging port electrical supply unit
10. Charging control unit
11. 1500W PSU
12. DC/DC converter
13. Inverter
14. Drive Motor Control Module
15. Electronically controlled brake unit
High Voltage Battery Service Cautions
Inner Service of High Voltage Battery (LiB Pack for PHEV: 355
volts) should NOT be handled by Dealer Technicians for SAFETY
reason. Also, NO Inner Service for 48 volts LiB Pack is allowed.

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High Voltage Battery Maintenance
For new vehicles in stock at the dealer, inspect and maintain the
high voltage battery periodically.

SA-018/23

PHEV 355V High Voltage Shutdown Before Service
CAUTION: Technician Hybrid & EV Specialist Cerfitication is
required.
Always make sure to follow the MGSS High Voltage Shutdown
procedure before servicing the vehicle.
1) Confirm No charging cable at the charging connector.
2) Open the Driver’s side door.
3) IG ON (READY LAMP ON) and wait for 3 seconds or more.
4) IG OFF (READY LAMP OFF) and wait for 5 minutes (Wait for
stop of Electric fan if moving even after 5 minutes.)
5) Remove minus terminal at 12 volts Lead-acid battery
within 25 minutes after IG OFF (then, Driver’s door can be closed.)
and wait for more 1 minute.

View from the bottom of
PHEV LiB Package

P-N Terminals

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6) Remove SERVICE PLUG with electrical insulating gloves.
7) Leave 10 minutes or more for electric discharge.
8) Check NO voltage at INVERTER Harness connection (P-N
terminals) in PHEV LiB Package with electrical insulating gloves.
9) In case of removing OBC &/or 1500W Power Supply after OBC
Contactor, Check NO voltage at P-N terminals at 1500W Power
Supply coupler with electrical insulting gloves.

1500W Power Supply

P-N Terminals
Volt Meter to use Max DC
450V

M Hybrid Boost 48V High Voltage Shutdown Before Service
Always make sure to follow the MGSS High Voltage Shutdown
procedure before servicing the vehicle.
1) IG OFF (READY LAMP OFF) and confirm stopping the Engine.
2) Leave 30 seconds or more.
3) Remove minus terminal at 12 volts Lead-acid battery.
High Voltage Battery Replacement
If MGSS diagnosis leads to a high voltage battery replacement,
contact Hotline for technical support.
CAUTION: DO NOT perform MGSS HIGH VOLTAGE BATTERY
REMOVAL/INSTALLATION.

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