# Service bulletin 09\-036\-19\-3623

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: 10166844
- Published by NHTSA: 2019\-10\-30
- Manufacturer's number: 09\-036\-19\-3623
- Manufacturer's date: 2019\-10\-02
- NHTSA component: EXTERIOR LIGHTING

## NHTSA's summary

Some customers may complain about an instrument cluster warning message "Auto Light System Malfunction. Turn On/Off Lights Manually". DTC B10AD:09 \(Humidity sensor/solar radiation sensor/auto light sensor/rain sensor malfunction\) may also be stored with the exterior light warning indicator light ON.display. This is caused by the rain sensor detecting a temperature higher than the operation range and temporarily stopping the auto light system. As a fail\-safe, the low beam headlights are turned on. The auto light system will start to operate normally when the A/C is turned on and the interior temperature drops. To correct this concern, the heat resistance performance of the rain sensor has been enhanced.

## The document

- [NHTSA's copy of the document (PDF)](https://static.nhtsa.gov/odi/tsbs/2019/MC-10166844-0001.pdf)
- [If that address does not open, try this one](https://static.nhtsa.gov/odi/tsbs/2019/MC-10166844-9999.pdf)

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

## Components

Lighting

## Trouble codes named

B10AD

## Vehicles listed

- 2019 to 2020 MAZDA MAZDA3

## Recalls for the same vehicles and component

- [2019224](/recalls/tc/2019224.md), 2019-05-14: Lights And Instruments

## Other bulletins for the same vehicles and component

- [SA\-038\-26a](/bulletins/11037018.md), 2026-09-04, Service bulletin: UNKNOWN OR OTHER; ELECTRICAL SYSTEM; ENGINE; EXTERIOR LIGHTING. This Service Alert supersedes the previously issued service alert listed below. The changes are noted in Red text. SA\-038/26 06/15/26 DESCRIPTION Some customers may complain about any of the following: 1. Infotainment Center Display does not provide the Authorization Code \(OTP\) during the MyMazda App Connected Vehicle enrollment. 2. Remote functions inoperative. Engine Start / Stop Door Lock / Unlock Lights ON / OFF Climate Control 3. MAZDA CONNECT connected vehicle reception strength icon shows "X" or " ". Index MAZDA CONNECT 2 Center Display Status Icon MAZDA CONNECT 3 Center Display Status Icon Remote Engine Start Will Not Function Remote Engine Start Function Will turn engine OFF Customer Subscription Status TCU Communication Line Status
- [SA\-023\-25c](/bulletins/11026916.md), 2026-01-04, Service bulletin: ENGINE; EXTERIOR LIGHTING; ELECTRICAL SYSTEM. Some customers may complain about any of the following: 1. Infotainment Center Display does not provide the Authorization Code \(OTP\) during the MyMazda App Connected Vehicle enrollment. 2. Remote function\(s\) inoperative. Engine Start / Stop • Door Lock / Unlock • Lights ON / OFF • Climate Control • 3. MAZDA CONNECT connected vehicle reception strength icon shows "X" or " ". Page
- [SA\-023\-25b](/bulletins/11022725.md), 2025-09-04, Service bulletin: UNKNOWN OR OTHER; ENGINE; ELECTRICAL SYSTEM; EXTERIOR LIGHTING. Some customers may complain about any of the following: 1. Infotainment Center Display does not provide the Authorization Code \(OTP\) during the MyMazda App Connected Vehicle enrollment. 2. Remote function\(s\) inoperative. Engine Start / Stop Door Lock / Unlock Lights ON / OFF Climate Control 3. MAZDA CONNECT connected vehicle reception strength icon shows "X" or " ".
- [SA\-023\-25a](/bulletins/11021499.md), 2025-08-05, Service bulletin: EXTERIOR LIGHTING; ENGINE; UNKNOWN OR OTHER. Some customers may complain about any of the following: 1. Infotainment Center Display does not provide the Authorization Code \(OTP\) during the MyMazda App Connected Vehicle enrollment. 2. Remote function\(s\) inoperative. Engine Start / Stop Door Lock / Unlock Lights ON / OFF Climate Control 3. MAZDA CONNECT connected vehicle reception strength icon shows "X" or " ".
- [SA\-023\-25](/bulletins/11019179.md), 2025-06-05, Service bulletin: UNKNOWN OR OTHER; ELECTRICAL SYSTEM; ENGINE; EXTERIOR LIGHTING. Some customers may complain about any of the following: 1. Infotainment Center Display does not provide the Authorization Code \(OTP\) during the MyMazda App Connected Vehicle enrollment. 2. Remote function\(s\) inoperative. Engine Start / Stop Door Lock / Unlock Lights ON / OFF Climate Control 3. MAZDA CONNECT connected vehicle reception strength icon shows "X" or " ".
- [SA\-017\-24b](/bulletins/11008573.md), 2024-10-05, Service bulletin: ELECTRICAL SYSTEM; ENGINE; EXTERIOR LIGHTING. Some customers may complain about any of the following: 1. Infotainment Center Display does not provide the Authorization Code \(OTP\) during the MyMazda App Connected Vehicle enrollment. 2. Remote function\(s\) inoperative. Engine Start / Stop Door Lock / Unlock Lights ON / OFF Climate Control
- [SA\-017\-24a](/bulletins/10254190.md), 2024-05-04, Service bulletin: EXTERIOR LIGHTING; ENGINE AND ENGINE COOLING; LATCHES/LOCKS/LINKAGES. Some customers may complain about any of the following: 1. Infotainment Center Display does not provide the Authorization Code \(OTP\) during the MyMazda App Connected Vehicle enrollment. 2. Remote function\(s\) inoperative. Engine Start / Stop Door Lock / Unlock Lights ON / OFF Climate Control
- [09\-020\-24](/bulletins/10252505.md), 2024-04-03, Service bulletin: EXTERIOR LIGHTING; ELECTRICAL SYSTEM. Some customers may experience that, with a specific operation, the touch sensor of front door outer handle does not lock and unlock the doors but the remote transmitter operates correctly. Description of the specific operations: Specific Operation 1 \[MX\-30\]: After using cabin preconditioning or hazard warning lights for approx.15 minutes. Specific Operation 2 \[MAZDA3 and CX\-30\]: After using hazard warning lights for approx. 15 minutes. Specific Operation 3 \[MAZDA3, CX\-30 and MX\-30\]: When both touch sensors are touched at once. Specific Operation 1 and 2 Cause: The touch sensor has been disabled to avoid the unintended locking/unlocking operation caused by rain. Specific Operation 3 Cause: The control logic is not appropriate. NOTE: If the concern occurs without the specific operation above, refer to TSB 09\-019/22 \(DOOR OUTER HANDLE TOUCH SENSOR DOES NOT LOCK AND/OR UNLOCK\). To correct this issue, the control software of the LF control unit \(LFU\) has been modified.
- [SA\-009\-23h](/bulletins/10241634.md), 2023-09-05, Service bulletin: EXTERIOR LIGHTING; ENGINE AND ENGINE COOLING; EQUIPMENT:ELECTRICAL:INFOTAINMENT. Some customers may complain about any of the following: 1. Infotainment Center Display does not provide the Authorization Code \(OTP\) during the MyMazda App Connected Vehicle enrollment. 2. Remote function\(s\) inoperative. Engine Start / Stop, Door Lock / Unlock, Lights ON / OFF
- [SA\-009\-23g](/bulletins/10241633.md), 2023-09-05, Service bulletin: EXTERIOR LIGHTING; EQUIPMENT:ELECTRICAL:INFOTAINMENT; ENGINE AND ENGINE COOLING. Some customers may complain about any of the following: 1. Infotainment Center Display does not provide the Authorization Code \(OTP\) during the MyMazda App Connected Vehicle enrollment. 2. Remote function\(s\) inoperative. Engine Start / Stop, Door Lock / Unlock, Lights ON / OFF

JSON: [/v1/bulletins/10166844](/v1/bulletins/10166844)

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