Inspection Procedure 7: Front passenger’s door lock/unlock switch does not work.


caution Before replacing the ECU, ensure that the power supply circuit, the earth circuit and the communication circuit are normal.

PROBABLE CAUSES



  • Malfunction of the outside transmission antenna assembly (passenger’s side)
  • Malfunction of the lock/unlock switch (passenger’s side)
  • Damaged wiring harness and connectors
  • Malfunction of the KOS-ECU

DIAGNOSIS PROCEDURE


STEP 1. M.U.T.-III diagnosis code



Q. Is the diagnosis code set?





STEP 2. Connector check: C-10 KOS-ECU connector, F-05 lock/unlock switch (passenger’s side) <LHD> connector, F-15 lock/unlock switch (passenger’s side) <RHD> connector


Q. Is the check result normal?





STEP 3. Check the wiring harness between the C-10 KOS-ECU connector terminal No. 15 and the F-05 lock/unlock switch (passenger’s side) <LHD> connector terminal No. 1, between the E-05 lock/unlock switch (passenger’s side) <LHD> connector terminal No. 2 and the earth, between the C-10 KOS-ECU connector terminal No. 15 and the F-15 lock/unlock switch (passenger’s side) <RHD> connector terminal No. 1, between the F-15 lock/unlock switch (passenger’s side) <RHD> connector terminal No. 2 and the earth.



  • Check the signal wire for open and short circuit, earth wire for open circuit.
note Before the wiring harness check, check the C-211 <LHD>, C-212 <LHD>, C-224 <RHD>, C-225 <RHD> intermediate connectors, and repair if necessary.

Q. Is the check result normal?





STEP 4. lock/unlock switch (passenger’s side) check



Q. Is the check result normal?





STEP 5. KOS communication test



Q. Is the check result normal?





STEP 6. Check of the troubles



Q. Is the check result normal?