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

id0902p4090200


Without Mazda ERA-GLONASS control module

Description

Collision signal error
Detection condition
•  When all of the following conditions continue for 3 s.
―  1.5 s or more have elapsed after ignition was switched ON
―  Rear body control module (RBCM) received error signal from SAS control module
Fail-safe
Not applicable
Possible cause
•  DTCs are stored in the SAS control module.
•  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 1AF and rear body control module (RBCM) terminal 3R
•  Short to power supply in wiring harness between SAS control module terminal 1AF and rear body control module (RBCM) terminal 3R
•  Open circuit in wiring harness between SAS control module terminal 1AF 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 SAS CONTROL MODULE DTCs
•  Perform the DTC inspection for the SAS control module using the M-MDS.
•  Are any DTCs present?
Yes
Go to the applicable DTC inspection.
(See DTC TABLE [SAS CONTROL MODULE (STANDARD DEPLOYMENT CONTROL SYSTEM)].)
(See DTC TABLE [SAS CONTROL MODULE (TWO-STEP DEPLOYMENT CONTROL SYSTEM)].)
No
Go to the next step.
2
INSPECT SAS CONTROL MODULE CONNECTOR
•  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 7.
3
INSPECT REAR BODY CONTROL MODULE (RBCM) CONNECTOR
•  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 7.
4
INSPECT WIRING HARNESS BETWEEN SAS CONTROL MODULE AND REAR BODY CONTROL MODULE (RBCM) FOR SHORT TO GROUND
•  Verify that the SAS control module and rear body control module (RBCM) connectors are disconnected.
•  Inspect for continuity between SAS control module terminal 1AF (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 SAS control module terminal 1AF and 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 7.
No
Go to the next step.
5
INSPECT WIRING HARNESS BETWEEN SAS CONTROL MODULE AND REAR BODY CONTROL MODULE (RBCM) FOR SHORT TO POWER SUPPLY
•  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 the SAS control module terminal 1AF (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 SAS control module terminal 1AF and 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 7.
6
INSPECT WIRING HARNESS BETWEEN SAS CONTROL MODULE AND REAR BODY CONTROL MODULE (RBCM) FOR OPEN 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 the wiring harness for continuity between SAS control module terminal 1AF (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 SAS control module terminal 1AF and 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 7.
7
VERIFY THAT REPAIRS HAVE BEEN COMPLETED
•  Reconnect all the disconnected connectors.
•  Reconnect the disconnected negative battery terminal.
•  Clear rear body control module (RBCM) DTCs using the M-MDS.
•  Perform the DTC inspection for the rear body control module (RBCM) using the M-MDS.
•  Is the same Pending DTC present?
Yes
Repeat the inspection from Step 1.
•  If the malfunction recurs, replace the rear body control module (RBCM), then go to the next step.
No
Go to the next step.
8
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 control module

Description

Collision signal error
Detection condition
•  When all of the following conditions continue for 3 s.
―  1.5 s or more have elapsed after ignition was switched ON
―  Rear body control module (RBCM) received error signal from Mazda ERA-GLONASS control module
Fail-safe
Not applicable
Possible cause
•  DTCs are stored in the Mazda ERA-GLONASS control module.
•  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 MAZDA ERA-GLONASS CONTROL MODULE DTCs
•  Perform the DTC inspection for the Mazda ERA-GLONASS control module using the M-MDS.
•  Are any DTCs present?
Yes
Go to the applicable DTC inspection.
(See DTC TABLE [MAZDA ERA-GLONASS CONTROL MODULE].)
No
Go to the next step.
2
INSPECT MAZDA ERA-GLONASS CONTROL MODULE CONNECTOR
•  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 7.
3
INSPECT REAR BODY CONTROL MODULE (RBCM) CONNECTOR
•  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 7.
4
INSPECT WIRING HARNESS BETWEEN MAZDA ERA-GLONASS CONTROL MODULE AND REAR BODY CONTROL MODULE (RBCM) FOR SHORT TO GROUND
•  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 Mazda ERA-GLONASS control module terminal 1AC and 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 7.
No
Go to the next step.
5
INSPECT WIRING HARNESS BETWEEN MAZDA ERA-GLONASS CONTROL MODULE AND REAR BODY CONTROL MODULE (RBCM) FOR SHORT TO POWER SUPPLY
•  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 the Mazda ERA-GLONASS control module terminal 1AC (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 Mazda ERA-GLONASS control module terminal 1AC and 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 7.
6
INSPECT WIRING HARNESS BETWEEN MAZDA ERA-GLONASS CONTROL MODULE AND REAR BODY CONTROL MODULE (RBCM) FOR OPEN 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 the wiring harness 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 Mazda ERA-GLONASS control module terminal 1AC and 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 7.
7
VERIFY THAT REPAIRS HAVE BEEN COMPLETED
•  Reconnect all the disconnected connectors.
•  Reconnect the disconnected negative battery terminal.
•  Clear rear body control module (RBCM) DTCs using the M-MDS.
•  Perform the DTC inspection for the rear body control module (RBCM) using the M-MDS.
•  Is the same Pending DTC present?
Yes
Repeat the inspection from Step 1.
•  If the malfunction recurs, replace the rear body control module (RBCM), then go to the next step.
No
Go to the next step.
8
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.