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

id0902p4090200

System malfunction location

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

―  RBCM received error signal from SAS control module

Fail-safe

—

Possible cause

•  SAS control module connector or terminal malfunction

•  Rear body control module (RBCM) connector or terminal malfunction

•  Short circuit to ground in wiring harness between SAS control module terminal 2B and rear body control module (RBCM) terminal 3R

•  Open circuit in wiring harness between SAS control module terminal 2B and rear body control module (RBCM) terminal 3R

•  Short to power supply in wiring harness between SAS control module terminal 2B and rear body control module (RBCM) terminal 3R

•  SAS control module malfunction

•  Rear body control module (RBCM) malfunction

System malfunction location	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 ― RBCM received error signal from SAS control module
Fail-safe	—
Possible cause	• SAS control module connector or terminal malfunction • Rear body control module (RBCM) connector or terminal malfunction • Short circuit to ground in wiring harness between SAS control module terminal 2B and rear body control module (RBCM) terminal 3R • Open circuit in wiring harness between SAS control module terminal 2B and rear body control module (RBCM) terminal 3R • Short to power supply in wiring harness between SAS control module terminal 2B 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. (See DTC INSPECTION [SAS CONTROL MODULE].) • Are any DTCs present?	Yes	Go to the applicable DTC inspection. (See DTC TABLE [SAS CONTROL MODULE].)
1		No	Go to the next step.
2	INSPECT SAS CONTROL MODULE CONNECTOR • Switch the ignition to off. • Disconnect the negative battery cable. (See NEGATIVE BATTERY CABLE DISCONNECTION/CONNECTION [SKYACTIV-G 2.0, SKYACTIV-G 2.5].) • 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.
2		No	Repair or replace the connector, then go to Step 7.
3	INSPECT REAR BODY CONTROL MODULE (RBCM) CONNECTOR • Switch the ignition to off. • Disconnect the negative battery cable. (See NEGATIVE BATTERY CABLE DISCONNECTION/CONNECTION [SKYACTIV-G 2.0, SKYACTIV-G 2.5].) • 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.
3		No	Repair or replace the connector, then go to Step 7.
4	INSPECT FOR SHORT TO GROUND BETWEEN WIPER SWITCH AND REAR BODY CONTROL MODULE (RBCM) • Switch the wiper switch off. • Inspect for continuity between rear body control module (RBCM) terminal 3R and body ground. • Is there continuity?	Yes	Repair or replace the wiring harness, then go to Step 7.
4		No	Go to the next step.
5	INSPECT WIRING HARNESS BETWEEN WIPER SWITCH AND REAR BODY CONTROL MODULE (RBCM) FOR OPEN CIRCUIT • Disconnect the rear body control module (RBCM) connector. • Disconnect the start stop unit connector. • Inspect for continuity between rear body control module (RBCM) terminal 3R and SAS control module terminal 2B. • Is there continuity?	Yes	Repair or replace the wiring harness, then go to Step 7.
5		No	Go to the next step.
6	INSPECT FOR SHORT TO POWER SUPPLY BETWEEN WIPER SWITCH AND REAR BODY CONTROL MODULE (RBCM) • Verify that the start stop unit and rear body control module (RBCM) connectors are disconnected. • Connect the negative battery cable. (See NEGATIVE BATTERY CABLE DISCONNECTION/CONNECTION [SKYACTIV-G 2.0, SKYACTIV-G 2.5].) • Switch the ignition ON (engine off or on). • Measure the voltage at rear body control module (RBCM) terminal 3R (vehicle wiring harness side). • Is the voltage 0 V?	Yes	Go to the next step.
6		No	Repair or replace the wiring harness and go to the next step.
7	VERIFY THAT REPAIRS HAVE BEEN COMPLETED • Reconnect all the disconnected connectors. • Reconnect the disconnected negative battery cable. (See NEGATIVE BATTERY CABLE DISCONNECTION/CONNECTION [SKYACTIV-G 2.0, SKYACTIV-G 2.5].) • Clear rear body control module (RBCM) DTCs using the M-MDS. (See CLEARING DTC [REAR BODY CONTROL MODULE (RBCM)].) • Perform the DTC inspection for the rear body control module (RBCM) using the M-MDS. (See DTC INSPECTION [REAR BODY CONTROL MODULE (RBCM)].) • Is DTC B1207:86 displayed?	Yes	Repeat the inspection from Step 1. • If the malfunction recurs, replace the rear body control module (RBCM), then go to the next step. (See REAR BODY CONTROL MODULE (RBCM) REMOVAL/INSTALLATION.)
7		No	Go to the next step.
8	VERIFY IF OTHER DTCs DISPLAYED • Are any other DTCs displayed?	Yes	Repair the malfunctioning part according to the applicable DTC troubleshooting. (See DTC TABLE [REAR BODY CONTROL MODULE (RBCM)].)
8		No	DTC troubleshooting completed.