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HOMESERVICE MANUALSMAZDA20066 I, 4D SEDAN, AUTOMATICREPAIR AND DIAGNOSIS (SINGLE PAGE)ACCESSORIES & EQUIPMENTCOMMUNICATION DEVICESON-BOARD DIAGNOSTIC [BODY CONTROL SYSTEM)DTC B1506
2006 Mazda 6 i, 4D Sedan, Automatic

DTC B1506

2006 Mazda 6 i, 4D Sedan, AutomaticSECTION DTC B1506
DTC B1506 DETECTION CONDITION AND POSSIBLE CAUSE

DTC B1506 Turn signal right circuit short to ground
DETECTION CONDITION  Short to GND in wiring harness between BCM and turn switch
POSSIBLE CAUSE 
  • Short to GND in wiring harness between BCM terminal 4C and light switch terminal A (LH)
  • Short to GND in wiring harness between BCM terminal 4E and light switch terminal E (RH)
  • Light switch malfunction
  • BCM malfunction
G04327078
DTC B1506 DIAGNOSTIC PROCEDURE

STEP INSPECTION ACTION
1 INSPECT LIGHT SWITCH CONNECTOR 
  • Disconnect the light switch connector.
  • Inspect the light switch connector terminals for poor connection (such as damaged/pulled-out pins, and corrosion).
  • Is there any malfunction?
 Yes Repair or replace the terminal, then go to Step 5.
No Go to the next step.
2 INSPECT BCM CONNECTOR 
  • Disconnect the BCM connector.
  • Inspect the BCM connector terminals for poor connection (such as damaged/pulled-out pins, and corrosion).
  • Is there any malfunction?
 Yes Repair or replace the terminal, then go to Step 5.
No Go to the next step.
3 INSPECT LIGHT SWITCH SIGNAL CIRCUIT FOR SHORT TO GND 
  • Inspect for continuity between following terminals:
    • BCM terminal 4C (wiring harness-side) - body GND
    • BCM terminal 4E (wiring harness-side) - body GND
  • Is there continuity?
 Yes Repair or replace the wiring harness for a possible short to GND, then go to Step 5.
No Go to the next step.
4 INSPECT LIGHT SWITCH 
  • Inspect the light switch.
  • Is there any malfunction?
 Yes Replace the light switch, then go to the next step.
(See LIGHT SWITCH INSPECTION. )
No Go to the next step.
5 VERIFY TROUBLESHOOTING COMPLETED 
  • Make sure to reconnect all disconnected connectors.
  • Perform the self-test.

    (See BCM SELF-TEST ).

  • Is the same DTC present?
 Yes Replace the BCM.
(See BODY CONTROL MODULE (BCM) REMOVAL/INSTALLATION. )
No DTC troubleshooting completed.
RENDER: 1.0x

NO RELATED

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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • • You smell fuel, burning insulation, or see smoke.
  • • Brakes feel soft, pull hard to one side, or make grinding noises.
  • • The engine overheats, stalls repeatedly, or misfires under load.
  • • You are missing required tools, torque specs, or safe lifting equipment.
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