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Home >> Mazda >> 2013 >> 5 Grand Touring >> Repair and Diagnosis >> Accessories & Equipment >> Communication Devices >> On-Board Diagnostic [Body Control System) >> DTC C1137:12 [BCM] >> ATX >> Diagnostic Procedure

Diagnostic Procedure

STEP INSPECTION ACTION
1 VERIFY BCM DTCs 
  • Clear the DTC using the M-MDS.

    (See CLEARING DTC [BCM] .)

  • Perform the BCM DTC inspection using the M-MDS with the selector lever in P or N position.

    (See DTC INSPECTION [BCM] .)

  • Is the same DTC present?
Yes Go to the next step.
No Go to Step 7.
2 INSPECT TR SWITCH CONNECTOR AND TERMINALS 
  • Switch the ignition to off.
  • Disconnect the negative battery cable.
  • Disconnect the TR switch 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 6.
No Go to the next step.
3 INSPECT BCM CONNECTOR AND TERMINALS 
  • Disconnect the BCM 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 6.
No Go to the next step.
4 INSPECT TR SWITCH CIRCUIT FOR SHORT TO POWER SUPPLY 
  • Verify that the TR switch and BCM connectors are disconnected.
  • Reconnect the negative battery cable.
  • Switch the ignition to ON.
  • Measure the voltage at the TR switch terminal D (wiring harness-side).
  • Is there any voltage?
Yes Repair or replace the wiring harness for a possible short to power supply, then go to Step 6.
No Go to the next step.
5 INSPECT TR SWITCH  Yes Replace the TR switch, then go to the next step.
(See TRANSAXLE RANGE (TR) SWITCH REMOVAL/INSTALLATION [FS5A-EL] .)
No Go to the next step.
6 VERIFY TROUBLESHOOTING COMPLETED 
  • Make sure to reconnect all disconnected connectors.
  • Reconnect the negative battery cable.
  • Clear the DTC using the M-MDS.

    (See CLEARING DTC [BCM] .)

  • Perform the BCM DTC inspection using the M-MDS with the selector lever in P or N position.

    (See DTC INSPECTION [BCM] .)

  • Is the same DTC present?
Yes Repeat the inspection from Step 1.
Go to the next step.
No Go to the next step.
7 VERIFY THAT NO OTHER DTCs ARE PRESENT 
  • Are any DTCs present?
Yes Go to the applicable DTC inspection.
(See DTC TABLE [BCM] .)
No DTC troubleshooting completed.