DIAGNOSIS
TSB Revision
KEYLESS OPERATION SYSTEM (KOS)
42B-147
STEP 3. lock/unlock switch (front door: LH) check.
(1) Remove the door outside handle base (Refer to GROUP
42A, Door Handle and Latch
P.42A-153
).
(2) Check continuity when the lock/unlock switch (front door:
LH) is operated to "ON" or "OFF" position.
Q: Is the lock/unlock switch (front: LH) normal?
YES : Go to Step 4.
NO : Replace the door outside handle base. Check that the
driver’s door lock/unlock switch works normally.
STEP 4. Check the wiring harness between KOS-ECU
connector C-102 (terminal No. 21) and lock/unlock switch
(front door: LH) connector E-23 (terminal No. 1), and
lock/unlock switch (front door: LH) connector E-23
(terminal No. 2) and ground.
NOTE: Also check intermediate connector C-126 and C-127 for
loose, corroded, or damaged terminals, or terminals pushed
back in the connector. If intermediate connector C-126 and
C-127 is damaged, repair or replace the damaged compo-
nent(s) as described in GROUP 00E, Harness Connector
Inspection
P.00E-2
.
Q: Are the wiring harness between KOS-ECU connector
C-102 (terminal No. 21) and lock/unlock switch (front
door: LH) connector E-23 (terminal No. 1), and
lock/unlock switch (front door: LH) connector E-23
(terminal No. 2) and ground in good condition?
YES : Go to Step 5.
NO : The wiring harness may be damaged or the
connector(s) may have loose, corroded or damaged
terminals, or terminals pushed back in the connector.
Repair the wiring harness as necessary. Check that
the driver’s door lock/unlock switch works normally.
STEP 5. KOS communication test
Using scan tool (M.U.T-III), perform the antenna communica-
tion test to check that the exterior transmitter antenna (driver's
side) communicates normally (Refer to
P.42B-197
).
Q: Is the check result normal?
YES : Go to Step 6.
NO : Perform troubleshooting for the diagnostic trouble
code No. B240A (Refer to
P.42B-35
).
Switch
position
Terminal
number
Normal value
ON
1
− 2
Continuity
exists (2
Ω or
less)
OFF
1
− 2
Open circuit
AC506541AH
Lock/unlock switch
Door outside
handle base