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Home >> Mazda >> 2013 >> 5 Grand Touring >> Repair and Diagnosis >> Body & Frame >> Door Locks >> On-Board Diagnostic [Immobilizer System] >> Security Indicator Light: 11, DTC: B10D9:87/P1260:00 [Immobilizer System] >> Diagnostic Procedure

Diagnostic Procedure

STEP INSPECTION ACTION
1 INSPECT COIL ANTENNA CONNECTOR AND TERMINALS 
  • Switch the ignition to off.
  • Disconnect the negative battery cable.
  • Disconnect the coil antenna connector.
  • Inspect the connector and terminals (corrosion, damage, pin disconnection).
  • Is there any malfunction?
 Yes Repair or replace the connector or terminals, then go to Step 8.
No Go to the next step.
2 INSPECT COIL ANTENNA POWER SUPPLY CIRCUIT FOR OPEN CIRCUIT AND SHORT TO GROUND 
  • Verify that the coil antenna connector is disconnected.
  • Reconnect the negative battery cable.
  • Switch the ignition to ON.
  • Measure the voltage at the coil antenna terminal D (wiring harness-side).
  • Is the voltage 8 V or more  ?
 Yes Go to the next step.
No Inspect the METER 10 A fuse.
  • If the fuse is blown:
    • Repair or replace the wiring harness for a possible short to ground.
    • Replace the fuse.
  • If the fuse is deteriorated:
    • Replace the fuse.
  • If the fuse is normal:
    • Repair or replace the wiring harness for a possible open circuit.

Go to Step 8.
3 INSPECT COIL ANTENNA GROUND CIRCUIT FOR OPEN CIRCUIT 
  • Verify that the coil antenna connector is disconnected.
  • Switch the ignition to off.
  • Disconnect the negative battery cable.
  • Inspect for continuity between coil antenna terminal C (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 Step 8.
4 INSPECT INSTRUMENT CLUSTER CONNECTOR AND TERMINALS 
  • Disconnect the instrument cluster connector.
  • Inspect the connector and terminals (corrosion, damage, pin disconnection).
  • Is there any malfunction?
 Yes Repair or replace the connector or terminals, then go to Step 8.
No Go to the next step.
5 INSPECT COIL ANTENNA COMMUNICATION CIRCUIT FOR SHORT TO GROUND 
  • Verify that the coil antenna and instrument cluster connectors are disconnected.
  • Inspect for continuity between the following terminals (wiring harness-side) and body ground:
    • Coil antenna terminal B
    • Coil antenna terminal A
  • 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 COIL ANTENNA COMMUNICATION CIRCUIT FOR OPEN CIRCUIT 
  • Verify that the coil antenna and instrument cluster connectors are disconnected.
  • Inspect for continuity between the following terminals (wiring harness-side):
    • Coil antenna terminal B-Instrument cluster terminal M
    • Coil antenna terminal A-Instrument cluster terminal Q
  • Is there continuity?
 Yes Go to the next step.
No Repair or replace the wiring harness for a possible open circuit, then go to Step 8.
7 PERFORM DTC INSPECTION AND VERIFY THAT MALFUNCTIONING PART IS COIL ANTENNA  Yes Replace the coil antenna, then go to the next step.
(See COIL ANTENNA REMOVAL/INSTALLATION .)
No Go to Step 9.
8 VERIFY TROUBLESHOOTING COMPLETED  Yes Repeat the inspection from Step 1.
Go to the next step.
No Go to the next step.
9 VERIFY THAT NO OTHER DTCs ARE PRESENT 
  • Are any DTCs present?
 Yes Go to the applicable DTC inspection.
(See DTC TABLE [IMMOBILIZER SYSTEM] .)
No DTC troubleshooting completed.
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