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Home >> Mazda >> 2021 >> CX-3 AWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 73 (On-Board Diagnostic - Blind Spot Monitoring Control Module) >> DTC U3000-4B: When Replacing A Blind Spot Monitoring (BSM) Control Module (RH) Having Any Of The Following Part Numbers, It Is Necessary To Replace The Blind Spot Monitoring (BSM) Control Module (LH) At The Same Time To Perform The Configuration Normally. >> Diagnostic Procedure

Diagnostic Procedure

WARNING: This page is about a different car, the 2016 Mazda CX-3. However, it is still accessible from the selected car via links, so may be relevant.
Step Inspection Action
1 VERIFY BLIND SPOT MONITORING (BSM) CONTROL MODULE INTERNAL TEMPERATURE  Yes Replace the blind spot monitoring (BSM) control module in which the internal temperature increased, then go to Step 3.
(Refer to BLIND SPOT MONITORING (BSM) CONTROL MODULE INSPECTION .)
No Go to the next step.
2 VERIFY IF MALFUNCTIONING LOCATION IS BLIND SPOT MONITORING (BSM) CONTROL MODULE (RH) DEPENDING ON REPEATABILITY  Yes Replace the blind spot monitoring (BSM) control module, then go to the next step.
(Refer to BLIND SPOT MONITORING (BSM) CONTROL MODULE INSPECTION .)
No Go to Step 4.
3 VERIFY THAT REPAIRS HAVE BEEN COMPLETED  Yes Repeat the inspection from Step 1.
Go to the next step.
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.
(Refer to DTC TABLE [BLIND SPOT MONITORING (BSM) CONTROL MODULE] .)
No DTC troubleshooting completed.