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Home >> Mazda >> 2019 >> CX-9 Signature >> Repair and Diagnosis (Single Page) >> Accessories & Equipment >> Communication Devices >> On-Board Diagnostic - Rear Body Control Module (RBCM) >> DTC B1207-86: Error Signal Received From SAS Control Module [Rear Body Control Module (RBCM)] >> Diagnostic Procedure
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Diagnostic Procedure

DTC B1207:86 (REAR BODY CONTROL MODULE) DIAGNOSTIC PROCEDURE

Step Inspection Action
1 VERIFY REAR BODY CONTROL MODULE (RBCM) DTCs AGAIN 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.

    (See NEGATIVE BATTERY TERMINAL DISCONNECTION/CONNECTION .)

  • 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 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 3AF (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 3AF 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 8.
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.

    (See NEGATIVE BATTERY TERMINAL DISCONNECTION/CONNECTION .)

  • Switch the ignition ON (engine off or on).
  • Measure the voltage at the SAS control module terminal 3AF (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 3AF 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 8.
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.

    (See NEGATIVE BATTERY TERMINAL DISCONNECTION/CONNECTION .)

  • 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 3AF (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 3AF 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 8.
7 VERIFY IF MALFUNCTIONING LOCATION IS SAS CONTROL MODULE DEPENDING ON REPEATABILITY 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 Yes Repeat the inspection from Step 1.
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.
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