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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 front door lock-link switch (driver-side) unlocked. (See DTC INSPECTION [BCM] .)
  • Is the same DTC present?
 Yes Go to the next step.
No Go to Step 9.
2 INSPECT FRONT DOOR LATCH AND LOCK ACTUATOR (DRIVER-SIDE) CONNECTOR CONDITION 
  • Switch the ignition to off.
  • Disconnect the negative battery cable.
  • Disconnect the front door latch and lock actuator (driver-side) 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.
3 DETERMINE THE MALFUNCTION LOCATION 
  • Reconnect the negative battery cable.
  • Measure the voltage between front door latch and lock actuator (driver-side) terminal B (wiring harness-side) and body ground.
  • Is there any voltage?
 Yes Go to the next step.
No Go to Step 6
4 INSPECT FRONT DOOR LOCK-LINK SWITCH (DRIVER-SIDE) CIRCUIT FOR OPEN CIRCUIT 
  • Inspect for continuity between front door latch and lock actuator (driver-side) terminal J (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.
5 INSPECT FRONT DOOR LOCK-LINK SWITCH (DRIVER-SIDE)  Yes Replace the front door latch and lock actuator (driver-side), then go to Step 8. (See FRONT DOOR LATCH AND LOCK ACTUATOR REMOVAL/INSTALLATION .)
No Go to Step 8.
6 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 8.
No Go to the next step
7 CONCLUDE THE MALFUNCTION LOCATION 
  • Reconnect the BCM connector
  • Reconnect the negative battery cable.
  • Measure the voltage between BCM terminal 8E (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.
8 VERIFY TROUBLESHOOTING COMPLETED 
  • Make sure to reconnect the disconnected connectors.
  • Reconnect the negative battery cable.
  • Clear DTCs using the M-MDS. (See CLEARING DTC [BCM] )
  • Perform the BCM DTC inspection using the M-MDS with the front door lock-link switch (driver-side) unlocked. (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.
9 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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