Inspection Procedure 5
Inspection Procedure 5: Keyless entry system does not work.
CAUTION:
Before replacing the ECU, ensure that the power supply circuit, the ground circuit and the communication circuit are normal.
TECHNICAL DESCRIPTION (COMMENT)
The lock/unlock signals from the transmitter are received by WCM, and then sent to ETACS-ECU from WCM. When ETACS-ECU receives signals from the key reminder switch and all the door switches, ETACS-ECU actuates the keyless entry system.
TROUBLESHOOTING HINTS
- The key reminder switch may be defective
- The door switches may be defective
- The liftgate latch assembly may defective [LANCER SPORTBACK]
- The keyless entry transmitter may be defective
- The WCM may be defective
- The ETACS-ECU may be defective
- The wiring harness or connectors may have loose, corroded, or damaged terminals, or terminals pushed back in the connector
- Option coding information
DIAGNOSIS
Required Special Tools:
- MB992006: Extra fine probe
- MB991223: Harness set
- MB991958 Scan Tool (M.U.T.-III Sub Assembly)
- MB991824: Vehicles Communication Interface (V.C.I.)
- MB991827 M.U.T.-III USB Cable
- MB991910 M.U.T.-III Main Harness A
STEP 1. Using scan tool MB991958, check for CAN bus 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 CAN bus lines related DTC is set.
(4)Turn the ignition switch to the "LOCK" (OFF) position.
Q. Is the DTC set?
YES Repair the CAN bus line Scan Tool Testing and Procedures).
NO Go to Step 2.
STEP 2. 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 ETACS-ECU related DTC is set.
(4)Turn the ignition switch to the "LOCK" (OFF) position.
Q. Is the DTC set?
YES Diagnose the ETACS-ECU. Refer to Wireless Control Module (WCM).
NO Go to Step 3.
STEP 3. Check the power supply system
With the ignition switch in the LOCK (OFF) position, check if the following function operates normally:
- Hazard warning light
Q. Is the check result normal?
YES Go to Step 4.
NO Symptom Procedures.
STEP 4. Verify the central door locking system.
Check that the central door locking system works normally.
Q. Is the check result normal?
YES Go to Step 5.
NO Symptom Chart.
STEP 5. Using scan tool MB991958, check data list.
Check the signals related to the keyless entry system operation.
(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 the Scan Tool (M.U.T.-III) Reading and Clearing Diagnostic Trouble Codes."
(2)Turn the ignition switch to the "LOCK" (OFF) position.
(3)Check the ETACS data list.
- Close the driver's door.
- Close the passenger's door.
- Close the RH-side rear door.
- Close the LH-side rear door.
- Close the liftgate [LANCER SPORTBACK].
- Remove the ignition key from the ignition key cylinder.
OK: Normal condition are displayed.
Q. Are the check result normal?
YES [Normal conditions are displayed for all the items.] : Go to Step 6.
NO [Normal condition is not displayed for item No. 256.] : Inspection Procedure 6.
NO [Normal condition is not displayed for item No. 257.] : Inspection Procedure 5.
NO [Normal condition is not displayed for item No. 258.] : Inspection Procedure 8.
NO [Normal condition is not displayed for item No. 259.] : Inspection Procedure 7.
NO [Normal condition is not displayed for item No. 260 (LANCER SPORTBACK).] : Inspection Procedure 9.
NO [Normal condition is not displayed for item No. 264.] : Inspection Procedure 3.
STEP 6. Retest the system.
Check if the keyless entry system works normally.
Q. Is the check result normal?
YES Intermittent malfunction How to Cope With Intermittent Malfunctions).
NO Replace WCM and register the ID codes (Refer to ID registration procedure manual
- ID codes registration judgement table).