LEMON Manuals: Even more car manuals for everyone: 1960-2025
Home >> Mazda >> 2021 >> 6 Signature >> Repair and Diagnosis (Single Page) >> Accessories & Equipment >> Communication Devices >> On-Board Diagnostic - Front Body Control Module (FBCM) >> DTC B10AD-86: Error Signal Received From Humidity Sensor/Auto Light Sensor/Rain Sensor (FBCM) >> Diagnostic Procedure
April 5, 2026: LEMON Manuals is launched! Read the announcement.

Diagnostic Procedure

DTC B10AD:86 (FBCM) DIAGNOSTIC PROCEDURE

STEP INSPECTION ACTION
1 PERFORM DTC INSPECTION AND VERIFY HUMIDITY SENSOR/AUTO LIGHT SENSOR/RAIN SENSOR MALFUNCTION
  • Clear the DTC for the front body control module (FBCM) using the M-MDS. (See CLEARING DTC (FBCM) .)
  • Switch the ignition ON (engine off or on) and wait for 5 s or more.
  • Retrieve the front body control module (FBCM) DTCs using the M-MDS. (See DTC INSPECTION (FBCM) .)
  • Is the same Pending DTC present?
Yes Replace the humidity sensor/auto light sensor/rain sensor, then go to the next step.
(See RAIN SENSOR REMOVAL/INSTALLATION .)
No Go to Step 3.
2 VERIFY THAT REPAIRS HAVE BEEN COMPLETED
  • Clear the DTC for the front body control module (FBCM) using the M-MDS. (See CLEARING DTC (FBCM) .)
  • Switch the ignition ON (engine off or on) and wait for 5 s or more.
  • Retrieve the front body control module (FBCM) DTCs using the M-MDS. (See DTC INSPECTION (FBCM) .)
  • Is the same Pending DTC present?
Yes Replace the front body control module (FBCM), then go to the next step.
(See FRONT BODY CONTROL MODULE (FBCM) REMOVAL/INSTALLATION .)
No Go to the next step.
3 VERIFY IF OTHER DTCs DISPLAYED
  • Are any other DTCs displayed?
Yes Repair or replace the malfunctioning part according to the applicable DTC troubleshooting.
(See DTC TABLE (FBCM) .)
No DTC troubleshooting completed.