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

id0902p4012900

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.
•  Retrieve the rear body control module (RBCM) DTCs using the M-MDS.
•  Is the same DTC displayed?
Yes
Go to the next step.
No
Go to Step 10.
2
INSPECT POWER WINDOW MAIN SWITCH CONNECTOR
•  Switch the ignition off.
•  Disconnect the negative battery cable.
•  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.
No
Repair or replace the connector, then go to Step 9.
3
INSPECT DOOR LOCK SWITCH (LH)
•  Inspect the door lock switch (LH).
•  Is the door lock switch (LH) normal?
Yes
Go to the next step.
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.
No
Repair or replace the connector, then go to Step 9.
5
INSPECT DOOR LOCK SWITCH (RH)
•  Inspect the door lock switch (RH).
•  Is the door lock switch (RH) normal?
Yes
Go to the next step.
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.
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.
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.
No
Go to the next step.
9
VERIFY THAT REPAIRS HAVE BEEN COMPLETED
•  Always reconnect all disconnected connectors.
•  Reconnect the negative battery cable.
•  Clear the DTC for the rear body control module (RBCM) using the M-MDS.
•  Retrieve the rear body control module (RBCM) DTCs using the M-MDS.
•  Is the same DTC displayed?
Yes
Repeat the inspection from Step 1.
•  If the malfunction recurs, replace the rear body control module (RBCM).
Go to the next step.
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)].)
No
DTC troubleshooting completed.