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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 door lock-link switch unlocked. (See DTC INSPECTION [BCM] )
  • Is the same DTC present?
 Yes Go to the next step
No Go to Step 24
2 DETERMINE THE MALFUNCTIONING BASED ON THE MALFUNCTIONING LOCATION 
  • Operate the door lock-link switch LOCK and UNLOCK.
  • Is there a door lock-link switch that does not operate?
 Yes Only the front door lock-link switch (passenger-side) does not operate.
  • Go to Step 5.

Only the rear door lock-link switch (driver-side) does not operate:
  • Go to Step 11.

Only the rear door lock-link switch (passenger-side) does not operate:
  • Go to Step 17.

All door lock-link switches do not operate:
  • Go to the next step
No Go to Step 23.
3 INSPECT BCM CONNECTOR CONDITION 
  • Switch the ignition to off
  • 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 23
No Go to the next step
4 INSPECT DOOR LOCK-LINK SWITCH POWER SUPPLY CIRCUIT FOR OPEN CIRCUIT 
  • Disconnect the front door lock-link switch (passenger-side) connector
  • Inspect for continuity between front door latch and lock actuator (passenger-side) terminal L (wiring harness-side) and BCM terminal 8C (wiring harness-side)
  • Is there continuity?
 Yes Go to Step 23
No Repair or replace the wiring harness for a possible open circuit, then go to Step 23
5 INSPECT FRONT DOOR LATCH AND LOCK ACTUATOR (PASSENGER-SIDE) CONNECTOR CONDITION 
  • Switch the ignition to off.
  • Disconnect the negative battery cable
  • Disconnect the front door latch and lock actuator (passenger-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 23.
No Go to the next step.
6 DETERMINE THE MALFUNCTION LOCATION 
  • Reconnect the negative battery cable.
  • Measure the voltage between front door latch and lock actuator (passenger-side) terminal L (wiring harness-side) and body ground
  • Is there any voltage?
 Yes Go to the next step.
No Go to Step 9.
7 INSPECT FRONT DOOR LOCK-LINK SWITCH (PASSENGER-SIDE) GROUND CIRCUIT FOR OPEN CIRCUIT 
  • Inspect for continuity between front door latch and lock actuator (passenger-side) terminal D (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 23.
8 INSPECT FRONT DOOR LOCK-LINK SWITCH (PASSENGER-SIDE)  Yes Replace the front door latch and lock actuator (passenger-side), then go to Step 23. (See FRONT DOOR LATCH AND LOCK ACTUATOR REMOVAL/INSTALLATION .)
No Go to Step 23.
9 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 23.
No Go to the next step.
10 CONCLUDE THE MALFUNCTION LOCATION 
  • Reconnect the BCM connector
  • Reconnect the negative battery cable.
  • Measure the voltage between BCM terminal 8C (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 Step 23.
No Go to Step 23.
11 INSPECT REAR DOOR LATCH AND LOCK ACTUATOR (DRIVER-SIDE) CONNECTOR CONDITION 
  • Switch the ignition to off.
  • Disconnect the negative battery cable.
  • Disconnect the rear 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 23
No Go to the next step
12 DETERMINE THE MALFUNCTION LOCATION 
  • Reconnect the negative battery cable.
  • Measure the voltage between rear 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 15.
13 INSPECT REAR DOOR LOCK-LINK SWITCH (DRIVER-SIDE) GROUND CIRCUIT FOR OPEN CIRCUIT 
  • Inspect for continuity between rear 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 23.
14 INSPECT REAR DOOR LOCK-LINK SWITCH (DRIVER-SIDE)  Yes Replace the rear door latch and lock actuator (driver-side), then go to Step 23. (See REAR DOOR LATCH AND LOCK ACTUATOR REMOVAL/INSTALLATION .)
No Go to Step 23.
15 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 23.
No Go to the next step.
16 CONCLUDE THE MALFUNCTION LOCATION 
  • Reconnect the BCM connector
  • Reconnect the negative battery cable.
  • Measure the voltage between BCM terminal 8C (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 Step 23.
No Go to Step 23.
17 INSPECT REAR DOOR LATCH AND LOCK ACTUATOR (PASSENGER-SIDE) CONNECTOR CONDITION 
  • Switch the ignition to off
  • Disconnect the negative battery cable
  • Disconnect the rear door latch and lock actuator (passenger-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 23.
No Go to the next step
18 DETERMINE THE MALFUNCTION LOCATION 
  • Reconnect the negative battery cable
  • Measure the voltage between rear door latch and lock actuator (passenger-side) terminal L (wiring harness-side) and body ground.
  • Is there any voltage?
 Yes Go to the next step.
No Go to Step 21
19 INSPECT REAR DOOR LOCK-LINK SWITCH (PASSENGER-SIDE) GROUND CIRCUIT FOR OPEN CIRCUIT 
  • Inspect for continuity between rear door latch and lock actuator (passenger-side) terminal D (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 23.
20 INSPECT REAR DOOR LOCK-LINK SWITCH (PASSENGER-SIDE)  Yes Replace the rear door latch and lock actuator (passenger-side), then go to Step 23. (See REAR DOOR LATCH AND LOCK ACTUATOR REMOVAL/INSTALLATION )
No Go to Step 23
21 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 23
No Go to the next step.
22 CONCLUDE THE MALFUNCTION LOCATION 
  • Reconnect the BCM connector
  • Reconnect the negative battery cable
  • Measure the voltage between BCM terminal 8C (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.
23 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 door lock-link switch 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.
24 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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