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09-19-17 – “AUTO LIGHT SYSTEM MALFUNCTION. TURN ON/OFF LIGHTS MANUALLY” WARNING MESSAGE AND DTC B10AD:09 STORED WHEN PARKED DURING HOT WEATHER CONDITIONS

09-19-17 – “AUTO LIGHT SYSTEM MALFUNCTION. TURN ON/OFF LIGHTS MANUALLY” WARNING MESSAGE AND DTC B10AD:09 STORED WHEN PARKED DURING HOT WEATHER CONDITIONS

SI121398

TSB NUMBER: 09-19-17

TSB ISSUE DATE

02/10/2019

BULLETIN NOTES

APPLICABLE MODEL(S)/VINS

  • 2019-2020 Mazda3 (Japan built) vehicles with VINs lower than JM1BP******150083 (produced before July 27, 2019)
  • 2019-2020 Mazda3 (Mexico built) vehicles with VINs starting with 3MZ

DESCRIPTION

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.
 

Exterior light warning light Combination Meter 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.

REPAIR PROCEDURE

1. Verify customer concern.
2. Replace the rain sensor with a modified one according to the instructions on MGSS (RAIN SENSOR REMOVAL/INSTALLATION).
3. Verify repair.

Parts Number Description Qty.
BDGF-66-5G0B Rain Sensor 1
 
 NOTE:

  • This warranty information applies only to verified customer complaints on vehicles eligible for warranty repair.
  • This repair will be covered under Mazda‚Äôs New Vehicle Limited Warranty term.
  • Additional diagnostic time cannot be claimed for this repair.
Warranty Type 0
Symptom Code 64
Damage Code 9W
Part Number Main Cause BDGF-66-5G0B
Quantity 1
Operation Number / Labor Hours: XXR9KXRX / 0.3 Hrs.