Inspection Procedure 6: Driver’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
(driver’s side)
- Malfunction of the lock/unlock switch (driver’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. Lock/unlock switch (LH) check
Q.
Is the check result normal?
STEP 3. Resistance measurement at lock/unlock switch (LH) connector (earth line)
| (1)Disconnect the connector, and measure at the wiring harness side. |
| (2)Measure the resistance between the lock/unlock switch (LH) connector (earth line)
and body earth. OK: Continuity exists (2 Ω or less) |
Q.
Is the check result normal?
STEP 4. Check of open circuit in earth line between the lock/unlock switch (LH) connector and the body earth.
| note | Before the wiring harness check, check the intermediate connectors, and repair if necessary. |
Q.
Is the check result normal?
STEP 5. Check of short to power supply, short to earth, and open circuit in DRRQ line between the KOS-ECU connector and the lock/unlock switch (LH) connector.
| note | Before the wiring harness check, check the intermediate connectors, and repair if necessary. |
Q.
Is the check result normal?
STEP 6. KOS communication test
Q.
Is the check result normal?
STEP 7. Check of the troubles
Q.
Is the check result normal?