DTC B11C4:23 [ADVANCED KEYLESS ENTRY SYSTEM]

id0902p8026600

System malfunction location

Request switch (liftgate) circuit malfunction
Detection condition
•  With the ignition switched ON (engine on), the start stop unit detects that the vehicle speed is 5 km/h {3 mph} or more for a continuous 2 min or more and the request switch (liftgate) is on 7 times or more until the vehicle speed is less than 5 km/h {3 mph}.
Fail-safe
—
Possible cause
•  Request switch (liftgate) connector or terminal malfunction
•  LF control unit connector or terminal malfunction
•  Short to ground in wiring harness between LF control unit terminal E (24-pin type)/I (28-pin type) and request switch (liftgate) terminal A
•  Request switch (liftgate) malfunction
•  LF control unit malfunction
•  Start stop unit malfunction

Diagnostic Procedure

Step

Inspection

Action
1
INSPECT REQUEST SWITCH (LIFTGATE) CONNECTOR CONDITION
•  Switch the ignition to off.
•  Disconnect the negative battery cable.
•  Disconnect the request switch (liftgate) 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 6.
2
INSPECT LF CONTROL UNIT CONNECTOR CONDITION
•  Disconnect the LF control unit 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 6.
3
INSPECT REQUEST SWITCH (LIFTGATE) CIRCUIT FOR SHORT TO GROUND
•  Verify that the LF control unit and request switch (liftgate) connectors are disconnected.
•  Inspect for continuity between request switch (liftgate) terminal A (vehicle wiring harness side) and body ground.
•  Is there continuity?
Yes
Repair or replace the wiring harness which is shorted to ground, then go to Step 6.
No
Go to the next step.
4
INSPECT REQUEST SWITCH (LIFTGATE)
•  Inspect the request switch (liftgate).
•  Is the request switch (liftgate) normal?
Yes
Go to the next step.
No
Replace the request switch (liftgate), then go to Step 6.
(See REQUEST SWITCH REMOVAL/INSTALLATION.)
5
INSPECT LF CONTROL UNIT
•  Inspect the LF control unit.
•  Is the LF control unit normal?
Yes
Go to the next step.
No
Replace the LF control unit, then go to the next step.
(See LF CONTROL UNIT REMOVAL/INSTALLATION.)
6
VERIFY THAT REPAIRS HAVE BEEN COMPLETED
•  Reconnect all the disconnected connectors.
•  Reconnect the disconnected negative battery cable.
•  Clear DTCs for the advanced keyless entry system using the M-MDS.
•  Drive the vehicle at 5 km/h {3 mph} or more for 2 min or more.
•  Perform the advanced keyless entry system DTC inspection using the M-MDS.
•  Is DTC B11C4:23 displayed?
Yes
Repeat the inspection from Step 1.
•  If the malfunction recurs, replace the start stop unit, then go to the next step.
No
Go to the next step.
7
VERIFY IF OTHER DTCs DISPLAYED
•  Are any other DTCs displayed?
Yes
Repair the malfunctioning part according to the applicable DTC troubleshooting.
(See DTC TABLE [ADVANCED KEYLESS ENTRY SYSTEM].)
No
DTC troubleshooting completed.