DTC B1207:86 [REAR BODY CONTROL MODULE (RBCM)]

id0902p4090200


Without MAZDA ERA-GLONASS

Description

Error signal received from SAS control module
Detection condition
•  The rear body control module (RBCM) detected the following conditions for 3 s or more with the ignition switched ON (engine off or on).
―  Error signal is received from SAS control module even though the collision detection unlock function presence signal received from the rear body control module (RBCM) determines that the function is present.
Fail-safe
Not applicable
Possible cause
•  SAS control module connector or terminal malfunction
•  Rear body control module (RBCM) connector or terminal malfunction
•  Short to ground in wiring harness between SAS control module terminal 2AE and rear body control module (RBCM) terminal 3R
•  Short to power supply in wiring harness between SAS control module terminal 2AE and rear body control module (RBCM) terminal 3R
•  Open circuit in wiring harness between SAS control module terminal 2AE and rear body control module (RBCM) terminal 3R
•  SAS control module malfunction
•  Rear body control module (RBCM) malfunction

Diagnostic Procedure

Step

Inspection

Action
1
VERIFY REAR BODY CONTROL MODULE (RBCM) DTCs AGAIN
•  Clear the DTC for the rear body control module (RBCM) using the M-MDS.
•  Switch the ignition ON (engine off or on) and wait for 3 s or more.
•  Retrieve the rear body control module (RBCM) DTCs using the M-MDS.
•  Is the same DTC displayed?
Yes
Go to the next step.
No
Go to Step 9.
2
INSPECT SAS CONTROL MODULE CONNECTOR CONDITION
•  Switch the ignition off.
•  Disconnect the negative battery terminal.
•  Disconnect the SAS control module connector.
•  Inspect the connector engagement and connection condition and inspect the terminals for damage, deformation, corrosion, or disconnection.
•  Is the connector normal?
Yes
Go to the next step.
No
Repair or replace the connector, then go to Step 8.
3
INSPECT REAR BODY CONTROL MODULE (RBCM) CONNECTOR CONDITION
•  Disconnect the rear body control module (RBCM) connector.
•  Inspect the connector engagement and connection condition and inspect the terminals for damage, deformation, corrosion, or disconnection.
•  Is the connector normal?
Yes
Go to the next step.
No
Repair or replace the connector, then go to Step 8.
4
INSPECT FOR SHORT TO GROUND IN SAS CONTROL MODULE CIRCUIT
•  Verify that the SAS control module and rear body control module (RBCM) connectors are disconnected.
•  Inspect for continuity between SAS control module terminal 2AE (wiring harness-side) and body ground.
•  Is there continuity?
Yes
Refer to the wiring diagram and verify whether or not there is a common connector between the following terminals:
•  SAS control module terminal 2AE—Rear body control module (RBCM) terminal 3R
If there is a common connector:
•  Determine the malfunctioning part by inspecting the common connector and the terminal for corrosion, damage, or pin disconnection, and the common wiring harness for a short to ground.
•  Repair or replace the malfunctioning part.
If there is no common connector:
•  Repair or replace the wiring harness which has a short to ground.
Go to Step 8.
No
Go to the next step.
5
INSPECT FOR SHORT TO POWER SUPPLY IN SAS CONTROL MODULE CIRCUIT
•  Verify that the SAS control module and rear body control module (RBCM) connectors are disconnected.
•  Connect the negative battery terminal.
•  Switch the ignition ON (engine off or on).
•  Measure the voltage at SAS control module terminal 2AE terminals (wiring harness-side).
•  Is the voltage 0 V?
Yes
Go to the next step.
No
Refer to the wiring diagram and verify whether or not there is a common connector between the following terminals:
•  SAS control module terminal 2AE—Rear body control module (RBCM) terminal 3R
If there is a common connector:
•  Determine the malfunctioning part by inspecting the common connector and the terminal for corrosion, damage, or pin disconnection, and the common wiring harness for a short to power supply.
•  Repair or replace the malfunctioning part.
If there is no common connector:
•  Repair or replace the wiring harness which has a short to power supply.
Go to Step 8.
6
INSPECT FOR OPEN CIRCUIT IN SAS CONTROL MODULE CIRCUIT
•  Switch the ignition off.
•  Disconnect the negative battery terminal.
•  Verify that the SAS control module and rear body control module (RBCM) connectors are disconnected.
•  Inspect for continuity between SAS control module terminal 2AE (wiring harness-side) and rear body control module (RBCM) terminal 3R (wiring harness-side).
•  Is there continuity?
Yes
Go to the next step.
No
Refer to the wiring diagram and verify whether or not there is a common connector between the following terminals:
•  SAS control module terminal 2AE—Rear body control module (RBCM) terminal 3R
If there is a common connector:
•  Determine the malfunctioning part by inspecting the common connector and the terminal for corrosion, damage, or pin disconnection, and the common wiring harness for an open circuit.
•  Repair or replace the malfunctioning part.
If there is no common connector:
•  Repair or replace the wiring harness which has an open circuit.
Go to Step 8.
7
VERIFY IF MALFUNCTIONING LOCATION IS SAS CONTROL MODULE DEPENDING ON REPEATABILITY
•  Always reconnect all disconnected connectors.
•  Connect the negative battery terminal.
•  Clear the DTC for the rear body control module (RBCM) using the M-MDS.
•  Switch the ignition ON (engine off or on) and wait for 3 s or more.
•  Retrieve the rear body control module (RBCM) DTCs using the M-MDS.
•  Is the same DTC displayed?
Yes
Replace the SAS control module, then go to the next step.
(See SAS CONTROL MODULE REMOVAL/INSTALLATION [STANDARD DEPLOYMENT CONTROL SYSTEM].)
(See SAS CONTROL MODULE REMOVAL/INSTALLATION [TWO-STEP DEPLOYMENT CONTROL SYSTEM].)
No
Go to Step 9.
8
VERIFY THAT REPAIRS HAVE BEEN COMPLETED
•  Always reconnect all disconnected connectors.
•  Connect the negative battery terminal.
•  Clear the DTC for the rear body control module (RBCM) using the M-MDS.
•  Switch the ignition ON (engine off or on) and wait for 3 s or more.
•  Retrieve the rear body control module (RBCM) DTCs using the M-MDS.
•  Is the same DTC displayed?
Yes
Repeat the inspection from Step 1.
•  If the malfunction recurs, replace the rear body control module (RBCM).
Go to the next step.
No
Go to the next step.
9
VERIFY IF OTHER DTCs DISPLAYED
•  Are any other DTCs displayed?
Yes
Repair or replace the malfunctioning part according to the applicable DTC troubleshooting.
(See DTC TABLE [REAR BODY CONTROL MODULE (RBCM)].)
No
DTC troubleshooting completed.


With MAZDA ERA-GLONASS

Description

Error signal received from MAZDA ERA-GLONASS control module
Detection condition
•  The rear body control module (RBCM) detected the following conditions for 3 s or more with the ignition switched ON (engine off or on).
―  Error signal is received from MAZDA ERA-GLONASS control module even though the collision detection unlock function presence signal received from the rear body control module (RBCM) determines that the function is present.
Fail-safe
Not applicable
Possible cause
•  MAZDA ERA-GLONASS control module connector or terminal malfunction
•  Rear body control module (RBCM) connector or terminal malfunction
•  Short to ground in wiring harness between MAZDA ERA-GLONASS control module terminal 1AC and rear body control module (RBCM) terminal 3R
•  Short to power supply in wiring harness between MAZDA ERA-GLONASS control module terminal 1AC and rear body control module (RBCM) terminal 3R
•  Open circuit in wiring harness between MAZDA ERA-GLONASS control module terminal 1AC and rear body control module (RBCM) terminal 3R
•  MAZDA ERA-GLONASS control module malfunction
•  Rear body control module (RBCM) malfunction

Diagnostic Procedure

Step

Inspection

Action
1
VERIFY REAR BODY CONTROL MODULE (RBCM) DTCs AGAIN
•  Clear the DTC for the rear body control module (RBCM) using the M-MDS.
•  Switch the ignition ON (engine off or on) and wait for 3 s or more.
•  Retrieve the rear body control module (RBCM) DTCs using the M-MDS.
•  Is the same DTC displayed?
Yes
Go to the next step.
No
Go to Step 9.
2
INSPECT MAZDA ERA-GLONASS CONTROL MODULE CONNECTOR CONDITION
•  Switch the ignition off.
•  Disconnect the negative battery terminal.
•  Disconnect the MAZDA ERA-GLONASS control module connector.
•  Inspect the connector engagement and connection condition and inspect the terminals for damage, deformation, corrosion, or disconnection.
•  Is the connector normal?
Yes
Go to the next step.
No
Repair or replace the connector, then go to Step 8.
3
INSPECT REAR BODY CONTROL MODULE (RBCM) CONNECTOR CONDITION
•  Disconnect the rear body control module (RBCM) connector.
•  Inspect the connector engagement and connection condition and inspect the terminals for damage, deformation, corrosion, or disconnection.
•  Is the connector normal?
Yes
Go to the next step.
No
Repair or replace the connector, then go to Step 8.
4
INSPECT FOR SHORT TO GROUND IN MAZDA ERA-GLONASS CONTROL MODULE CIRCUIT
•  Verify that the MAZDA ERA-GLONASS control module and rear body control module (RBCM) connectors are disconnected.
•  Inspect for continuity between MAZDA ERA-GLONASS control module terminal 1AC (wiring harness-side) and body ground.
•  Is there continuity?
Yes
Refer to the wiring diagram and verify whether or not there is a common connector between the following terminals:
•  MAZDA ERA-GLONASS control module terminal 1AC—Rear body control module (RBCM) terminal 3R
If there is a common connector:
•  Determine the malfunctioning part by inspecting the common connector and the terminal for corrosion, damage, or pin disconnection, and the common wiring harness for a short to ground.
•  Repair or replace the malfunctioning part.
If there is no common connector:
•  Repair or replace the wiring harness which has a short to ground.
Go to Step 8.
No
Go to the next step.
5
INSPECT FOR SHORT TO POWER SUPPLY IN MAZDA ERA-GLONASS CONTROL MODULE CIRCUIT
•  Verify that the MAZDA ERA-GLONASS control module and rear body control module (RBCM) connectors are disconnected.
•  Connect the negative battery terminal.
•  Switch the ignition ON (engine off or on).
•  Measure the voltage at MAZDA ERA-GLONASS control module terminal 1AC terminals (wiring harness-side).
•  Is the voltage 0 V?
Yes
Go to the next step.
No
Refer to the wiring diagram and verify whether or not there is a common connector between the following terminals:
•  MAZDA ERA-GLONASS control module terminal 1AC—Rear body control module (RBCM) terminal 3R
If there is a common connector:
•  Determine the malfunctioning part by inspecting the common connector and the terminal for corrosion, damage, or pin disconnection, and the common wiring harness for a short to power supply.
•  Repair or replace the malfunctioning part.
If there is no common connector:
•  Repair or replace the wiring harness which has a short to power supply.
Go to Step 8.
6
INSPECT FOR OPEN CIRCUIT IN MAZDA ERA-GLONASS CONTROL MODULE CIRCUIT
•  Switch the ignition off.
•  Disconnect the negative battery terminal.
•  Verify that the MAZDA ERA-GLONASS control module and rear body control module (RBCM) connectors are disconnected.
•  Inspect for continuity between MAZDA ERA-GLONASS control module terminal 1AC (wiring harness-side) and rear body control module (RBCM) terminal 3R (wiring harness-side).
•  Is there continuity?
Yes
Go to the next step.
No
Refer to the wiring diagram and verify whether or not there is a common connector between the following terminals:
•  MAZDA ERA-GLONASS control module terminal 1AC—Rear body control module (RBCM) terminal 3R
If there is a common connector:
•  Determine the malfunctioning part by inspecting the common connector and the terminal for corrosion, damage, or pin disconnection, and the common wiring harness for an open circuit.
•  Repair or replace the malfunctioning part.
If there is no common connector:
•  Repair or replace the wiring harness which has an open circuit.
Go to Step 8.
7
VERIFY IF MALFUNCTIONING LOCATION IS MAZDA ERA-GLONASS CONTROL MODULE DEPENDING ON REPEATABILITY
•  Always reconnect all disconnected connectors.
•  Connect the negative battery terminal.
•  Clear the DTC for the rear body control module (RBCM) using the M-MDS.
•  Switch the ignition ON (engine off or on) and wait for 3 s or more.
•  Retrieve the rear body control module (RBCM) DTCs using the M-MDS.
•  Is the same DTC displayed?
Yes
Replace the MAZDA ERA-GLONASS control module, then go to the next step.
(See MAZDA ERA-GLONASS CONTROL MODULE REMOVAL/INSTALLATION.)
No
Go to Step 9.
8
VERIFY THAT REPAIRS HAVE BEEN COMPLETED
•  Always reconnect all disconnected connectors.
•  Connect the negative battery terminal.
•  Clear the DTC for the rear body control module (RBCM) using the M-MDS.
•  Switch the ignition ON (engine off or on) and wait for 3 s or more.
•  Retrieve the rear body control module (RBCM) DTCs using the M-MDS.
•  Is the same DTC displayed?
Yes
Repeat the inspection from Step 1.
•  If the malfunction recurs, replace the rear body control module (RBCM).
Go to the next step.
No
Go to the next step.
9
VERIFY IF OTHER DTCs DISPLAYED
•  Are any other DTCs displayed?
Yes
Repair or replace the malfunctioning part according to the applicable DTC troubleshooting.
(See DTC TABLE [REAR BODY CONTROL MODULE (RBCM)].)
No
DTC troubleshooting completed.