# Service bulletin 08\-002\-23

A bulletin is a manufacturer's communication to its dealers, as NHTSA indexes it. The summary is NHTSA's. The document is the manufacturer's: read it at NHTSA. A bulletin is not a recall, and listing a model year does not mean every vehicle of it is concerned.

- Type: Service bulletin
- NHTSA id: 10232280
- Published by NHTSA: 2023\-03\-03
- Manufacturer's number: 08\-002\-23
- Manufacturer's date: 2023\-02\-28
- NHTSA component: ELECTRICAL SYSTEM:12V/24V/48V BATTERY; AIR BAGS; AIR BAGS:SENSOR:OCCUPANT CLASSIFICATION:STATUS INDICATOR LAMP/LIGHT

## NHTSA's summary

Some customers may experience the airbag warning light ON with DTC B00A0:09 stored in the SAS control module memory when the battery voltage is low. DTC B00A0:09 \(Occupant classification sensor internal signal output unstable\). This concern is caused by the low voltage detection time of the occupant classification sensor \(OCS\) being too short during cranking, which causes detection of the DTC unnecessarily. The concern occurs more often in colder weather when greater electric current is consumed to start the vehicle. To eliminate this concern, the OCS has been modified to avoid unnecessary DTC detection. NOTE: Even if the voltage is recovered after the engine is started, the airbag warning light stays ON during the drive cycle. When the battery voltage becomes stable after the engine is started, the airbag system will operate normally.

## The document

- [NHTSA's copy of the document (PDF)](https://static.nhtsa.gov/odi/tsbs/2023/MC-10232280-0001.pdf)
- [If that address does not open, try this one](https://static.nhtsa.gov/odi/tsbs/2023/MC-10232280-9999.pdf)

The document is the manufacturer's. This site does not hold it.

## Components

Air bags, Electrical system, 12\-volt battery

## Trouble codes named

B00A0

## Vehicles listed

- 2016 to 2020 MAZDA CX\-3
- 2017 to 2020 MAZDA CX\-5

## Other bulletins for the same vehicles and component

- [01\-007\-23](/bulletins/10237197.md), 2023-06-04, Service bulletin: ELECTRICAL SYSTEM:12V/24V/48V BATTERY; ELECTRICAL SYSTEM. The Mazda DCA\-8000 is required for all warranty battery testing. If the Mazda DCA\-8000 is not used, incorrect battery testing may result in unnecessary battery replacement. Use the following test procedures in this Service Bulletin to test Mazda vehicle batteries and to generate a Warranty Code.
- [01\-006\-21\-3779a](/bulletins/10200933.md), 2021-09-03, Service bulletin: ELECTRICAL SYSTEM:12V/24V/48V BATTERY; ENGINE AND ENGINE COOLING. This service bulletin provides testing and charging procedures in order to promote proper battery maintenance, to deliver new vehicles with fully charged batteries, and to reduce unnecessary battery replacement cost. For new vehicles in stock at the dealer, inspect and maintain the battery periodically according to the repair procedure.
- [15\-003\-20\-3737](/bulletins/10180670.md), 2020-10-03, Service bulletin: SERVICE BRAKES, HYDRAULIC; VISIBILITY; EQUIPMENT ADAPTIVE/MOBILITY; ELECTRICAL SYSTEM:12V/24V/48V BATTERY; STEERING:ELECTRIC POWER ASSIST SYSTEM. Some vehicles may exhibit that the SBS/SCBS warning light \(amber\) turns ON right after the engine is started with DTC U0420:68 \[FSC\] stored in memory. • DTC U0420:68 \[Forward sensing camera \(FSC\)\]: Error signal received from electric power steering \(EPS\) control module. For Mazda6 and CX\-5, the following error messages may appear in the instrument cluster. • Front camera sensor system malfunction • Forward Smart City Brake Support Malfunction • Driver attention alert system malfunction. This may be caused by the battery voltage falling and the EPS control module failing the initial learning for the steering center position while cranking. The FSC detects the error notified by the EPS control module. To correct this concern, the control software of the EPS control module has been modified while the repair procedure modifies the FSC for earlier repairs in the market.
- [08\-001\-20\-3696](/bulletins/10174574.md), 2020-05-04, Service bulletin: AIR BAGS:SENSOR:OCCUPANT CLASSIFICATION; ELECTRICAL SYSTEM:12V/24V/48V BATTERY. Some customers may experience the airbag warning light ON with DTC B00A0:09 stored in the SAS control module memory when the battery voltage is low. DTC B00A0:09 \(Occupant classification sensor internal signal output unstable\). This concern is caused by the low voltage detection time of the occupant classification sensor \(OCS\) being too short during cranking, which causes detection of the DTC unnecessarily. The concern occurs more often in colder weather when greater electric current is consumed to start the vehicle. To eliminate this concern, the OCS has been modified to avoid unnecessary DTC detection. NOTE: Even if the voltage is recovered after the engine is started, the airbag warning light stays ON during the drive cycle. When the battery voltage becomes stable after the engine is started, the airbag system will operate normally.
- [MT\-008\-18](/bulletins/10145239.md), 2018-10-09, Service bulletin: ENGINE; ELECTRICAL SYSTEM; ELECTRICAL SYSTEM:12V/24V/48V BATTERY. Some customers may complain about: Intermittent engine no start, Instrument cluster red security indicator light ON, Engine Start/Start Button Amber indicator, light flashing, Battery discharge, Electrical relay buzzing noise.This may be caused by: A key in a purse near a cell phone. The cell phone radio waves may interrupt the immobilizer system. An aftermarket cell phone charger. The charger may produce electrical noise that interrupts the immobilizer system. An aftermarket GPS tracker. Some aftermarket devices that are wired to the vehicles?s wiring harness may create unusual electrical symptoms.
- [MT\-004\-18](/bulletins/10145237.md), 2018-10-09, Service bulletin: ELECTRICAL SYSTEM; ELECTRICAL SYSTEM:12V/24V/48V BATTERY; EQUIPMENT. If you encounter any type of electrical concern \(e.g, dead battery, engine no start, DTC\(s\) stored...\), interview the customer before proceeding with normal Workshop Manual diagnosis. Aftermarket devices may be the cause of the electrical concern. Ask the customer if any aftermarket devices have been installed. Below are a couple of examples of unusual electrical concerns caused by aftermarket devices.
- [01\-009\-18\-3452](/bulletins/10134929.md), 2018-04-23, Service bulletin: ELECTRICAL SYSTEM:12V/24V/48V BATTERY. The Mazda GR8\-1291 is required for all warranty battery testing. If the Mazda GR8\-1291 is not used, incorrect battery testing may result in unnecessary battery replacement. Use the following test procedures in this Service Bulletin to test Mazda vehicle batteries and to generate a Warranty Code.
- [01\-008\-18\-3451](/bulletins/10134928.md), 2018-04-23, Service bulletin: ELECTRICAL SYSTEM:12V/24V/48V BATTERY. This service bulletin provides testing and charging procedures in order to promote proper battery maintenance, to deliver new vehicles with fully charged batteries, and to reduce unnecessary battery replacement cost. For new vehicles in stock at the dealer, inspect and maintain the battery periodically according to the repair procedure.

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