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Home >> Mazda >> 2012 >> 6 i Touring >> Repair and Diagnosis >> External Pages >> Different car >> Section 625 (On-Board Diagnostic [Blind Spot Monitoring System]) >> DTC U3000:4A [Blind Spot Monitoring (BSM)] >> Diagnostic Procedure

Diagnostic Procedure

WARNING: This page is about a different car, the 2009 Mazda 6. However, it is still accessible from the selected car via links, so may be relevant.
DIAGNOSTIC PROCEDURE

STEP INSPECTION ACTION
1 VERIFY BSM CONTROL MODULES NOT INSTALLED IN REVERSE 
  • Verify the left/right indicator labels adhered to the BSM control modules
  • Have the left and right BSM control modules been installed in reverse?
 Yes Install the BSM control modules in their correct positions, then go to Step 8.
No Go to the next step.
2 INSPECT BSM OFF SWITCH CONNECTOR CONDITION 
  • Switch the ignition to off
  • Disconnect the BSM OFF switch connector.
  • Inspect for poor connection (damaged/ pulled-out pins, corrosion).
  • Is there any malfunction?
 Yes Repair or replace the connector or terminal, then go to Step 8.
No Go to the next step.
3 INSPECT BSM OFF SWITCH  Yes Replace the BSM OFF switch, then go to Step 8.
See BLIND SPOT MONITORING (BSM) OFF SWITCH REMOVAL/INSTALLATION .
No Go to the next step.
4 INSPECT BSM CONTROL MODULE (RH) CONNECTOR FOR POOR CONNECTION 
  • Disconnect the BSM control module (RH) connector
  • Inspect for poor connection (damaged/ pulled-out pins, corrosion).
  • Is there any malfunction?
 Yes Repair or replace the connector or terminal, then go to Step 8.
No Go to the next step.
5 INSPECT BSM OFF SWITCH SIGNAL CIRCUIT FOR SHORT TO GROUND 
  • Inspect for continuity between BSM OFF switch terminal E (wiring harness-side) and body ground.
  • Is there continuity?
 Yes Repair or replace the wiring harness for a possible short to ground, then go to Step 8.
No Go to the next step.
6 INSPECT BSM CONTROL MODULE (LH) CONNECTOR FOR POOR CONNECTION 
  • Disconnect the BSM control module (LH) connector.
  • Inspect for poor connection (damaged/ pulled-out pins, corrosion).
  • Is there any malfunction?
 Yes Repair or replace the connector or terminal, then go to Step 8.
No Go to the next step.
7 INSPECT BSM CONTROL MODULE (LH) GROUND CIRCUIT FOR OPEN CIRCUIT 
  • Inspect for continuity between BSM control module (LH) terminal E (wiring harness-side) and body ground
  • Is there continuity?
 Yes Go to the next step
No Repair or replace the wiring harness for a possible open circuit, then go to the next step
8 VERIFY TROUBLESHOOTING COMPLETED  Yes Replace the BSM control module, then go to the next step.
See BLIND SPOT MONITORING (BSM) CONTROL MODULE REMOVAL/INSTALLATION .
No Go to the next step.
9 VERIFY THAT NO OTHER DTCs ARE RECORDED 
  • Are any DTCs present?
 Yes Go to the applicable DTC inspection.
See DTC TABLE [BLIND SPOT MONITORING (BSM)] .
No DTC troubleshooting completed
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