DTC B1172:13 [REAR BODY CONTROL MODULE (RBCM)]

id0902p4013900

Description

Front door lock-link switch (driver's side) unlock circuit malfunction

Detection condition

•  Rear body control module (RBCM) detects an open circuit in the front door lock-link switch (driver's side) unlock circuit with the front door lock-link switch (driver's side) unlocked.

Fail-safe function

Not applicable

Possible cause

•  Front door latch and lock actuator (driver's side) connector or terminal malfunction

•  Open circuit in wiring harness between the following:

―  Front door latch and lock actuator (LH) terminal J—Body ground (L.H.D.)

―  Front door latch and lock actuator (RH) terminal D—Body ground (R.H.D.)

•  Front door lock-link switch (driver's side) malfunction

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

•  Open circuit in wiring harness between the following terminals:

―  Rear body control module (RBCM) terminal 3M—Front door latch and lock actuator (LH) terminal B (L.H.D.)

―  Rear body control module (RBCM) terminal 3M—Front door latch and lock actuator (RH) terminal L (R.H.D.)

•  Rear body control module (RBCM) malfunction

Description	Front door lock-link switch (driver's side) unlock circuit malfunction
Detection condition	• Rear body control module (RBCM) detects an open circuit in the front door lock-link switch (driver's side) unlock circuit with the front door lock-link switch (driver's side) unlocked.
Fail-safe function	Not applicable
Possible cause	• Front door latch and lock actuator (driver's side) connector or terminal malfunction • Open circuit in wiring harness between the following: ― Front door latch and lock actuator (LH) terminal J—Body ground (L.H.D.) ― Front door latch and lock actuator (RH) terminal D—Body ground (R.H.D.) • Front door lock-link switch (driver's side) malfunction • Rear body control module (RBCM) connector or terminal malfunction • Open circuit in wiring harness between the following terminals: ― Rear body control module (RBCM) terminal 3M—Front door latch and lock actuator (LH) terminal B (L.H.D.) ― Rear body control module (RBCM) terminal 3M—Front door latch and lock actuator (RH) terminal L (R.H.D.) • 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. (See CLEARING DTC [REAR BODY CONTROL MODULE (RBCM)].) • Retrieve the rear body control module (RBCM) DTCs using the M-MDS with the front door lock-link switch (driver's side) unlocked. (See DTC INSPECTION [REAR BODY CONTROL MODULE (RBCM)].) • Is the same DTC displayed?	Yes	Go to the next step.
1		No	Go to Step 9.
2	VERIFY REAR BODY CONTROL MODULE (RBCM) DTCs AGAIN • Clear the DTC for the rear body control module (RBCM) using the M-MDS. (See CLEARING DTC [REAR BODY CONTROL MODULE (RBCM)].) • Retrieve the rear body control module (RBCM) DTCs using the M-MDS with the front door lock-link switch (driver's side) unlocked. (See DTC INSPECTION [REAR BODY CONTROL MODULE (RBCM)].) • Is DTC B126A:11 or B126A:13 displayed?	Yes	Repair or replace the malfunctioning part according to the applicable DTC troubleshooting. (See DTC TABLE [REAR BODY CONTROL MODULE (RBCM)].)
2		No	Go to the next step.
3	INSPECT FRONT DOOR LATCH AND LOCK ACTUATOR (DRIVER'S SIDE) CONNECTOR CONDITION • Switch the ignition off. • Disconnect the negative battery cable. (See NEGATIVE BATTERY CABLE DISCONNECTION/CONNECTION [SKYACTIV-G 1.5, SKYACTIV-G 2.0, SKYACTIV-G 2.5].) (See NEGATIVE BATTERY CABLE DISCONNECTION/CONNECTION [SKYACTIV-D 1.5].) (See NEGATIVE BATTERY CABLE DISCONNECTION/CONNECTION [SKYACTIV-D 2.2].) (See NEGATIVE BATTERY CABLE DISCONNECTION/CONNECTION [MZR 1.6].) • Disconnect the front door latch and lock actuator (driver's side) 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 8.
4	INSPECT FOR OPEN CIRCUIT IN FRONT DOOR LOCK-LINK SWITCH (DRIVER'S SIDE) GROUND CIRCUIT • Verify that the front door latch and lock actuator (driver's side) connector is disconnected. • Inspect for continuity between the following terminal (wiring harness-side) and body ground: ― Front door latch and lock actuator (LH) terminal J (L.H.D.) ― Front door latch and lock actuator (RH) terminal D (R.H.D.) • Is there continuity?	Yes	Go to the next step.
4		No	Refer to the wiring diagram and verify whether or not there is a common connector between the following terminals: • Front door latch and lock actuator (LH) terminal J—Body ground (L.H.D.) • Front door latch and lock actuator (RH) terminal D—Body ground (R.H.D.) 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.
5	INSPECT FRONT DOOR LOCK-LINK SWITCH (DRIVER'S SIDE) • Inspect the front door lock-link switch (driver's side). (See FRONT DOOR LOCK-LINK SWITCH INSPECTION.) • Is the front door lock-link switch (driver's side) normal?	Yes	Go to the next step.
5		No	Replace the front door latch and lock actuator (driver's side), then go to Step 8. (See FRONT DOOR LATCH AND LOCK ACTUATOR REMOVAL/INSTALLATION.)
6	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.
6		No	Repair or replace the connector, then go to Step 8.
7	INSPECT FOR OPEN CIRCUIT IN FRONT DOOR LOCK-LINK SWITCH (DRIVER'S SIDE) UNLOCK CIRCUIT • Verify that the rear body control module (RBCM) and front door latch and lock actuator (driver's side) connectors are disconnected. • Inspect for continuity between the following terminals (wiring harness-side): ― Rear body control module (RBCM) terminal 3M—Front door latch and lock actuator (LH) terminal B (L.H.D.) ― Rear body control module (RBCM) terminal 3M—Front door latch and lock actuator (RH) terminal L (R.H.D.) • Is there continuity?	Yes	Go to the next step.
7		No	Refer to the wiring diagram and verify whether or not there is a common connector between the following terminals: • Rear body control module (RBCM) terminal 3M—Front door latch and lock actuator (LH) terminal B (L.H.D.) • Rear body control module (RBCM) terminal 3M—Front door latch and lock actuator (RH) terminal L (R.H.D.) 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 the next step.
8	VERIFY THAT REPAIRS HAVE BEEN COMPLETED • Always reconnect all disconnected connectors. • Reconnect the negative battery cable. (See NEGATIVE BATTERY CABLE DISCONNECTION/CONNECTION [SKYACTIV-G 1.5, SKYACTIV-G 2.0, SKYACTIV-G 2.5].) (See NEGATIVE BATTERY CABLE DISCONNECTION/CONNECTION [SKYACTIV-D 1.5].) (See NEGATIVE BATTERY CABLE DISCONNECTION/CONNECTION [SKYACTIV-D 2.2].) (See NEGATIVE BATTERY CABLE DISCONNECTION/CONNECTION [MZR 1.6].) • Clear the DTC for the rear body control module (RBCM) using the M-MDS. (See CLEARING DTC [REAR BODY CONTROL MODULE (RBCM)].) • Retrieve the rear body control module (RBCM) DTCs using the M-MDS with the front door lock-link switch (driver's side) unlocked. (See DTC INSPECTION [REAR BODY CONTROL MODULE (RBCM)].) • Is the same DTC displayed?	Yes	Repeat the inspection from Step 1. • If the malfunction recurs, replace the rear body control module (RBCM). (See REAR BODY CONTROL MODULE (RBCM) REMOVAL/INSTALLATION.) Go to the next step.
8		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)].)
9		No	DTC troubleshooting completed.