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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 selector lever in P or N position (transaxle range switch off) (See DTC INSPECTION [BCM] )
  • Is the same DTC present?
 Yes Go to the next step
No Go to Step 7
2 INSPECT TRANSAXLE RANGE SWITCH CONNECTOR CONDITION 
  • Switch the ignition to off.
  • Disconnect the negative battery cable.
  • Disconnect the transaxle range 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 TRANSAXLE RANGE SWITCH  Yes Replace the transaxle range switch, then go to Step 6 (See TRANSAXLE RANGE (TR) SWITCH REMOVAL/INSTALLATION [FS5A-EL] .)
No Go to the next step
4 INSPECT BCM CONNECTOR CONDITION 
  • 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.
5 INSPECT TRANSAXLE RANGE SWITCH CIRCUIT FOR SHORT TO POWER SUPPLY 
  • Reconnect the negative battery cable
  • Switch the ignition to ON.
  • Measure the voltage between following terminals and body ground.
    • Transaxle range switch terminal D (wiring harness-side)
    • Back-up light (LH/RH) terminal A (wiring harness-side)
  • Is there any voltage?
 Yes Repair or replace the wiring harness for a possible short to power supply, then go to the next step.
No Go to the next step
6 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 selector lever in P or N position (transaxle range switch off) (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.
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.


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 shift lever in N position (back-up light switch off). (See DTC INSPECTION [BCM] .)
  • Is the same DTC present?
 Yes Go to the next step.
No Go to Step 7
2 INSPECT BACK-UP LIGHT SWITCH CONNECTOR CONDITION 
  • Switch the ignition to off
  • Disconnect the negative battery cable.
  • Disconnect the back-up light 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 BACK-UP LIGHT SWITCH  Yes Replace the back-up light switch, then go to Step 6. (See BACK-UP LIGHT SWITCH REMOVAL/INSTALLATION [G66M-R] .)
No Go to the next step.
4 INSPECT BCM CONNECTOR CONDITION 
  • 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.
5 INSPECT BACK-UP LIGHT SWITCH CIRCUIT FOR SHORT TO POWER SUPPLY 
  • Reconnect the negative battery cable.
  • Switch the ignition to ON.
  • Measure the voltage between following terminals and body ground.
    • Back-up light switch terminal B (wiring harness-side)
    • Back-up light (LH/RH) terminal A (wiring harness-side)
  • Is there any voltage?
 Yes Repair or replace the wiring harness for a possible short to power supply, then go to the next step.
No Go to the next step.
6 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 shift lever in N position (back-up light switch off). (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.
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.


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 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 6
2 INSPECT BACK-UP LIGHT RELAY 
  • Switch the ignition to off
  • Disconnect the negative battery cable
  • Remove the back-up light relay
  • Inspect the back-up light relay. (See RELAY INSPECTION .)
  • Is there any malfunction?
 Yes Replace the back-up light relay, then go to Step 5.
No Go to the next step.
3 INSPECT BCM CONNECTOR CONDITION 
  • 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 5.
No Go to the next step.
4 INSPECT BACK-UP LIGHT RELAY CIRCUIT FOR SHORT TO POWER SUPPLY 
  • Reconnect the negative battery cable
  • Switch the ignition to ON
  • Measure the voltage between following terminals and body ground.
    • Back-up light relay terminal C (wiring harness-side)
    • Back-up light (LH/RH) terminal A (wiring harness-side)
  • Is there any voltage?
 Yes Repair or replace the wiring harness for a possible short to power supply, then go to the next step
No Go to the next step.
5 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 selector lever in P or N position (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.
6 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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