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Home >> Mitsubishi >> 2008 >> Lancer Evolution L4-2.0L Turbo (4B11T/C) >> Repair and Diagnosis >> Body and Frame >> Locks >> Keyless Entry >> Testing and Inspection >> Symptom Related Diagnostic Procedures >> Symptom Diagnostic Procedures >> Inspection Procedure 14

Inspection Procedure 14

Inspection Procedure 14: 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.

KOS-ECU System Input Signal (Part 1):




KOS-ECU System Input Signal (Part 2):






TECHNICAL DESCRIPTION (COMMENT)
The receiver antenna module assembly lock and unlock signals from the keyless operation key, and sends them to KOS-ECU, and further to ETACS-ECU. Also, when ETACS receives signals from the key reminder switch and all the door switches, ETACS-ECU judges them to activate the keyless entry system.

TROUBLESHOOTING HINTS
- Malfunction of CAN bus line
- Malfunction of the door switches
- Malfunction of the key reminder switch
- Malfunction of the receiver antenna assembly
- Malfunction of the keyless operation key
- Damaged wiring harness and connectors
- Malfunction of the KOS-ECU
- Malfunction of ETACS-ECU

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, read CAN bus the diagnostic trouble code.

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.






1. Connect scan tool MB991958. Refer to "How to connect scan tool (M.U.T.-III)." How To Connect The Scan Tool (M.U.T.-III)
2. Turn the ignition switch to the "ON" position.
3. Diagnose the CAN bus line.
4. Turn the ignition switch to the "LOCK" (OFF) position.

Q: Is the CAN bus line found to be normal?

YES: Go to Step 2.

NO: Repair the CAN bus line (Refer to Controller Area Network (CAN), Diagnosis).

STEP 2. Using scan tool MB991958, read the diagnostic trouble code.

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.






1. Connect scan tool MB991958. Refer to "How to connect scan tool (M.U.T.-III)." How To Connect The Scan Tool (M.U.T.-III)
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). Diagnostic Trouble Code Descriptions

NO: Go to Step 3.

STEP 3. Using scan tool MB991958, check data list.

Check the signals related to the keyless entry system operation.

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.






1. Connect scan tool MB991958. Refer to "How to connect the Scan Tool (M.U.T.-III)." Scan Tool Connecting
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.
- 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 4.

NO [Normal condition is not displayed for item No.256.] : Refer to Chassis Electrical, Inspection Procedure 5:ETACS-ECU does not receive any signal from the front door switch (LH).

NO [Normal condition is not displayed for item No.257.] : Refer to Chassis Electrical, Inspection Procedure 6:ETACS-ECU does not receive any signal from the front door switch (RH).

NO [Normal condition is not displayed for item No.258.] : Refer to Chassis Electrical, Inspection Procedure 8:ETACS-ECU does not receive any signal from the rear door switch (RH).

NO [Normal condition is not displayed for item No.259.] : Refer to Chassis Electrical, Inspection Procedure 7:ETACS-ECU does not receive any signal from the rear door switch (LH).

NO [Normal condition is not displayed for item No.260.] : Refer to Chassis Electrical, Inspection Procedure 9:ETACS-ECU does not receive any signal from the trunk lid latch.

NO [Normal condition is not displayed for item No.264.] : Refer to Chassis Electrical, Inspection Procedure 3:ETACS-ECU does not receive any signal from the key reminder switch.

STEP 4. Check KOS-ECU connector C-05 and receiver antenna assembly connector D-14 for loose, corroded or damaged terminals, or terminals pushed back in the connector.

Q: Are KOS-ECU connector C-05 and receiver antenna assembly connector D-14 in good condition?

YES: Go to Step 5.

NO: Repair or replace the damaged component(s). Refer to general (Electrical), Harness Connector Inspection. Check that the keyless entry system works normally.

STEP 5. Check the wiring harness between the KOS-ECU connector C-05 (terminal Nos. 7, 9, 12 and 32) and receiver antenna assembly connector D-14 (terminal Nos. 12, 3, 1and 5) for open circuit.

1. Disconnect KOS-ECU connector C-05 and receiver antenna assembly connector D-14, and check the wiring harness.




2. Check the wiring harness between KOS-ECU connector C-05 (terminal No.7) and receiver antenna assembly connector D-14 (terminal No.12).

OK: Continuity exists (2 Ohms or less)




3. Check the wiring harness between KOS-ECU connector C-05 (terminal No.9) and receiver antenna assembly connector D-14 (terminal No.3).

OK: Continuity exists (2 Ohms or less)




4. Check the wiring harness between KOS-ECU connector C-05 (terminal No.12) and receiver antenna assembly connector D-14 (terminal No.1).

OK: Continuity exists (2 Ohms or less)




5. Check the wiring harness between KOS-ECU connector C-05 (terminal No.32) and receiver antenna assembly connector D-14 (terminal No.5).

OK: Continuity exists (2 Ohms or less)

Q: Is the wiring harness between KOS-ECU connector C-05 (terminal Nos. 7, 9, 12 and 32) and receiver antenna assembly connector D-14 (terminal Nos. 12, 3, 1 and 5)in good condition?

YES: Go to Step 6.

NO (KOS-ECU connector C-05 terminal No.7 - receiver antenna assembly connector D-14 terminal No.12.) : Repair the wiring harness between KOS-ECU connector C-05 (terminal No.7) and receiver antenna assembly connector D-14 (terminal No.12).

NO (KOS-ECU connector C-05 terminal No.9 - receiver antenna assembly connector D-14 terminal No.3.) : Repair the wiring harness between KOS-ECU connector C-05 (terminal No.9) and receiver antenna assembly connector D-14 (terminal No.3).

NO (KOS-ECU connector C-05 terminal No.12 - receiver antenna assembly connector D-14 terminal No.1.) : Repair the wiring harness between KOS-ECU connector C-05 (terminal No.12) and receiver antenna assembly connector D-14 (terminal No.1).

NO (KOS-ECU connector C-05 terminal No.32 - receiver antenna assembly connector D-14 terminal No.5.) : Repair the wiring harness between KOS-ECU connector C-05 (terminal No.32) and receiver antenna assembly connector D-14 (terminal No.5).

STEP 6. Check the wiring harness between the receiver antenna assembly connector D-14 (terminal Nos. 12, 3, 1and 5) and the ground for short circuit.

1. Disconnect receiver antenna assembly connector D-14, and check the wiring harness.




2. Check the wiring harness between receiver antenna assembly connector D-14 (terminal No.12) and ground

OK: No continuity




3. Check the wiring harness between receiver antenna assembly connector D-14 (terminal No.3) and ground

OK: No continuity




4. Check the wiring harness between receiver antenna assembly connector D-14 (terminal No.1) and ground

OK: No continuity




5. Check the wiring harness between receiver antenna assembly connector D-14 (terminal No.5) and ground

OK: No continuity

Q: Is the wiring harness between receiver antenna assembly connector D-14 (terminal Nos. 12, 3, 1 and 5) and the ground in good condition?

YES: Go to Step 7.

NO (receiver antenna assembly connector D-14 terminal No.12 - ground.) : Repair the wiring harness between receiver antenna assembly connector D-14 (terminal No.12) and the ground.

NO (receiver antenna assembly connector D-14 terminal No.3 - ground.) : Repair the wiring harness between receiver antenna assembly connector D-14 (terminal No.3) and the ground.

NO (receiver antenna assembly connector D-14 terminal No.1 - ground.) : Repair the wiring harness between receiver antenna assembly connector D-14 (terminal No.1) and the ground.

NO (receiver antenna assembly connector D-14 terminal No.5 - ground.) : Repair the wiring harness between receiver antenna assembly connector D-14 (terminal No.5) and the ground.

STEP 7. Check with another registered keyless operation key.

Check that the keyless entry function can be used with another keyless operation key.

Q: Can the keyless entry function be used?

YES: Replace the keyless operation key concerned and register the ID codes (Refer to ID Code Registration Necessity Judgment Table).

NO: Go to Step 8.

STEP 8. Check of the troubles

Replace receiver antenna assembly. After the replacement,perform the coding, and check that the keyless entry system operates normally.

Q: Is the check result normal?

YES: The diagnosis is complete.

NO: Replace KOS-ECU and register the ID codes (Refer to ID Code Registration Necessity Judgment Table).
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