Inspection Procedure 12

Inspection Procedure 12: The lock switch and open switch of the liftgate lock release handle do not work. [LANCER SPORTBACK]

CAUTION:
Before replacing the ECU, ensure that the power supply circuit, the ground circuit and the communication circuit are normal.










PROBABLE CAUSES

- Malfunction of the outside transmission antenna assembly
(liftgate)

- Malfunction of the liftgate lock release handle

- Damaged wiring harness and connectors

- Malfunction of the KOS-ECU

DIAGNOSIS

STEP 1. Using scan tool MB991958, read the diagnostic trouble code.





(1)
CAUTION:
To prevent damage to scan tool MB991958, always turn the ignition switch to the "LOCK" (OFF) position before connecting or disconnecting scan tool MB991958.

Connect scan tool MB991958. Refer to "How to connect scan tool (M.U.T.-III) Reading and Clearing Diagnostic Trouble Codes."
(2)Turn the ignition switch to the "ON" position.
(3)Check whether the KOS-ECU related DTC is set.
(4)Turn the ignition switch to the "LOCK" (OFF) position.

Q. Is the DTC set?

YES Diagnose the KOS-ECU. Refer to Diagnostic Trouble Code Chart Keyless Operation System (KOS).

NO Go to Step 2.

STEP 2. Check liftgate lock release handle connector F-33 for loose, corroded or damaged terminals, or terminals pushed back in the connector.

Q. Is liftgate lock release handle connector F-33 in good condition?

YES Go to Step 3.
NO Repair or replace the damaged component(s). Harness Connector Inspection. Check that the liftgate lock release handle works normally.
STEP 3. Check the wiring harness between liftgate lock release handle connector F-33 (terminal No. 2) and ground.

- Check the ground wires for open circuit.

Q. Are the wiring harness between liftgate lock release handle connector F-33 (terminal No. 2) and ground in good condition?

YES Go to Step 4.
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 liftgate lock release handle works normally.
STEP 4. Liftgate lock release handle check

(1)Remove the liftgate lock release handle Service and Repair).





(2)Check continuity when the liftgate lock release handle is operated to "ON" or "OFF" position.
[OPEN SWITCH]





[LOCK SWITCH]





Q. Is the liftgate lock release handle normal?

YES Go to Step 5.

NO Replace the liftgate lock release handle. Check that the liftgate lock release handle works normally.

STEP 5. KOS communication test

Using scan tool (M.U.T-III), perform the antenna communication test to check that the outside transmission antenna assembly (liftgate) communicates normally (Refer to Testing and Inspection).

Q. Is the check result normal?

YES Go to Step 6
NO Perform troubleshooting for diagnostic trouble code No. B240C (Refer to Keyless Operation System (KOS)).
STEP 6. Check of the troubles

Operate the liftgate lock release handle and check that the liftgate can be locked and opened.

Q. Is the check result normal?

YES Intermittent malfunction is suspected How to Cope With Intermittent Malfunctions).
NO Replace KOS-ECU and register the ID codes (Refer to ID Codes Registration Procedure).