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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.
Step Inspection Action
1 PERFORM DTC INSPECTION 
  • Clear the DTC using the M-MDS. (See CLEARING DTC [BCM] .)
  • Perform the BCM DTC inspection using the M-MDS with the parking brake lever applied (parking brake switch on). (See DTC INSPECTION [BCM] .)
  • Is the same DTC present?
 Yes Go to the next step.
No Go to Step 8.
2 INSPECT PARKING BRAKE SWITCH CONNECTOR CONDITION 
  • Switch the ignition to off.
  • Disconnect the negative battery cable.
  • Disconnect the parking brake 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 7.
No Go to the next step.
3 DETERMINE THE MALFUNCTION LOCATION 
  • Reconnect the negative battery cable
  • Measure the voltage between parking brake switch terminal A (wiring harness-side) and body ground
  • Is there any voltage?
 Yes Go to the next step.
No Go to Step 5.
4 INSPECT PARKING BRAKE SWITCH  Yes Replace the parking brake switch, then go to Step 7. (See PARKING BRAKE LEVER REMOVAL/INSTALLATION .)
No Go to Step 7
5 INSPECT BCM CONNECTOR CONDITION 
  • Disconnect the negative battery cable.
  • 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 7.
No Go to the next step.
6 CONCLUDE THE MALFUNCTION LOCATION 
  • Reconnect the BCM connector.
  • Reconnect the negative battery cable
  • Measure the voltage between BCM terminal 8A (wiring harness-side) and body ground.
  • Is the voltage normal? (See BODY CONTROL MODULE (BCM) INSPECTION .)
 Yes Repair or replace the wiring harness for a possible open circuit, then go to the next step.
No Go to the next step.
7 VERIFY TROUBLESHOOTING COMPLETED 
  • Make sure to reconnect the 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 parking brake lever applied (parking brake switch on) (See DTC INSPECTION [BCM] .)
  • Is the same DTC present?
 Yes Repeat the inspection from Step 1.
If the malfunction recurs, replace the BCM, then go to the next step. (See BODY CONTROL MODULE (BCM) REMOVAL/INSTALLATION .)
No Go to the next step.
8 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.
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