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Home >> Mazda >> 2019 >> 6 Signature >> Repair and Diagnosis >> Accessories & Equipment >> Drivers Assistance Systems - ADAS >> On-Board Diagnostics - Blind Spot Monitoring Control Module >> DTC U0401-68: Error Signal Received From Pcm >> Diagnostic Procedure

Diagnostic Procedure

DTC U0401:68 BLIND SPOT MONITORING (BSM) CONTROL MODULE DIAGNOSTIC PROCEDURE

Step Inspection Action
1 VERIFY PCM DTCs Yes Repair or replace the malfunctioning part according to the applicable DTC troubleshooting. (See DTC TABLE [PCM (SKYACTIV-G 2.5T)] .) (See DTC TABLE [PCM (SKYACTIV-G 2.5 (WITH CYLINDER DEACTIVATION))] .)
 
No Go to the next step.
2 VERIFY IF MALFUNCTIONING LOCATION IS PCM DEPENDING ON REPEATABILITY Yes Replace the PCM, then go to the next step. (See PCM REMOVAL/INSTALLATION [SKYACTIV-G 2.5T] .) (See PCM REMOVAL/INSTALLATION [SKYACTIV-G 2.5 (WITH CYLINDER DEACTIVATION)] .)
 
No Go to Step 4.
3 VERIFY THAT REPAIRS HAVE BEEN COMPLETED Yes Replace the blind spot monitoring (BSM) control module, then go to the next step.
(See BLIND SPOT MONITORING (BSM) CONTROL MODULE REMOVAL/INSTALLATION .)
No Go to the next step.
4 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 (BLIND SPOT MONITORING (BSM) CONTROL MODULE) .)
No DTC troubleshooting completed.