Diagnostic Procedure
WARNING: This page is about a different car, the 2018 Mazda 6. However, it is still accessible from the selected car via links, so may be relevant.
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))]
.) (See DTC TABLE [PCM (SKYACTIV-G 2.5 (WITHOUT 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)]
.) (See PCM REMOVAL/INSTALLATION [SKYACTIV-G 2.5 (WITHOUT 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
|
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. | ||