DTC B108F:16 [REAR BODY CONTROL MODULE (RBCM)]

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2014 - Mazda6 - Body and Accessories

DTC B108F:16 [REAR BODY CONTROL MODULE (RBCM)]


Description	Door lock switch circuit malfunction
Detection condition	With the door lock switch off, the rear body control module (RBCM) detects door lock switch circuit voltage of 4 V or less.
Fail-safe function	Not applicable
Possible cause	Power window main switch connector or terminal malfunction Door lock switch (LH) malfunction Door lock switch (RH) connector or terminal malfunction Door lock switch (RH) malfunction Rear body control module (RBCM) connector or terminal malfunction Short to ground in wiring harness between the following terminals: Auto-open/close function for all windows Rear body control module (RBCM) terminal 3F—Power window main switch terminal 2J Rear body control module (RBCM) terminal 3F—Door lock switch (RH) terminal C Auto-open/close function for driver-side window Rear body control module (RBCM) terminal 3F—Power window main switch terminal 2M Rear body control module (RBCM) terminal 3F—Door lock switch (RH) terminal C Rear body control module (RBCM) malfunction

^*1: Auto-open/close function for all windows
^*2: Auto-open/close function for driver-side window

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. (See DTC INSPECTION [REAR BODY CONTROL MODULE (RBCM)].) Is the same DTC displayed?	Yes	Go to the next step.
1		No	Go to Step 10.
2	INSPECT POWER WINDOW MAIN SWITCH CONNECTOR Switch the ignition off. Disconnect the negative battery cable. (See NEGATIVE BATTERY CABLE DISCONNECTION/CONNECTION [SKYACTIV-G 2.5].) Disconnect the power window main switch 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 9.
3	INSPECT DOOR LOCK SWITCH (LH) Inspect the door lock switch (LH). (See DOOR LOCK SWITCH INSPECTION.) Is the door lock switch (LH) normal?	Yes	Go to the next step.
3		No	Replace the power window main switch, then go to Step 9. (See POWER WINDOW MAIN SWITCH REMOVAL/INSTALLATION.)
4	INSPECT DOOR LOCK SWITCH (RH) CONNECTOR Disconnect the door lock switch (RH) 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.
4		No	Repair or replace the connector, then go to Step 9.
5	INSPECT DOOR LOCK SWITCH (RH) Inspect the door lock switch (RH). (See DOOR LOCK SWITCH INSPECTION.) Is the door lock switch (RH) normal?	Yes	Go to the next step.
5		No	Replace the door lock switch (RH), then go to Step 9. (See DOOR LOCK SWITCH REMOVAL/INSTALLATION.)
6	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.
6		No	Repair or replace the connector, then go to Step 9.
7	INSPECT FOR SHORT TO GROUND IN DOOR LOCK SWITCH CIRCUIT Verify that the power window main switch, door lock switch (LH) and rear body control module (RBCM) connectors are disconnected. Inspect for continuity between rear body control module (RBCM) terminal 3F (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: Auto-open/close function for all windows Rear body control module (RBCM) terminal 3F—Power window main switch terminal 2J Rear body control module (RBCM) terminal 3F—Door lock switch (RH) terminal C Auto-open/close function for driver-side window Rear body control module (RBCM) terminal 3F—Power window main switch terminal 2M Rear body control module (RBCM) terminal 3F—Door lock switch (RH) terminal C 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 9.
7		No	Go to the next step.
8	INSPECT DOOR LOCK SWITCH CIRCUIT FOR SHORT TO GROUND Verify the rear body control module (RBCM) connector, power window main switch connector, and door lock switch (RH) connectors are disconnected. Inspect for continuity between rear body control module (RBCM) terminal 3F (vehicle wiring harness side) and body ground. Is there continuity?	Yes	Repair or replace the wiring harness which has a short to ground, then go to the next step.
8		No	Go to the next step.
9	VERIFY THAT REPAIRS HAVE BEEN COMPLETED Always reconnect all disconnected connectors. Reconnect the negative battery cable. (See NEGATIVE BATTERY CABLE DISCONNECTION/CONNECTION [SKYACTIV-G 2.5].) 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. (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.
9		No	Go to the next step.
10	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)].)
10		No	DTC troubleshooting completed.

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