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Home >> Mitsubishi >> 2012 >> Eclipse L4-2.4L (4G69) >> Repair and Diagnosis >> Body and Frame >> Body Control Systems >> Testing and Inspection >> Symptom Related Diagnostic Procedures >> Input Signal Procedures >> Inspection Procedure M-5

Inspection Procedure M-5




INSPECTION PROCEDURE M-5: ETACS-ECU does not receive one of signals from the door switches.


































CIRCUIT OPERATION

The ETACS-ECU operates the following functions or systems according to signal from the door switches:

- Ignition key reminder tone alarm function[ door switch (LH)]
- Light reminder tone alarm function[ door switch (LH)]
- Door ajar warning buzzer
- Forgotten key reminder
- Power window timer function
- Sunroof timer function[ door switch (LH)]
- Keyless entry system
- Timed locking mechanism
- Headlight automatic shutdown function[ door switch (LH)]
- Dome light
- Interior light automatic-shutdown function
- Ignition key cylinder illumination light[ door switch (LH)]
- Door-ajar indicator light

TECHNICAL DESCRIPTION (COMMENT)

If the signal is not normal, the functions or systems described in "CIRCUIT OPERATION" do not work normally. If the signal is not normal, the door switches or the ETACS-ECU may be defective.

TROUBLESHOOTING HINTS

- The door switches may be defective
- The wiring harness or connectors may have loose, corroded, or damaged terminals, or terminals pushed back in the connector
- The ETACS-ECU may be defective

DIAGNOSIS

Required Special Tools:

- MB991223: Harness Set
- MB992006: Extra Fine Probe
- MB991958: Scan Tool (M.U.T.-III Sub Assembly)
- MB991824: V.C.I.
- MB991827: M.U.T.-III USB Cable
- MB991910: M.U.T.-III Main Harness A

STEP 1. Check the input signal (by using the pulse check mode of the monitor).

Check the input signals from the door switches.

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 the scan tool MB991958.Refer to "How to connect SWS monitor How to Connect SWS Monitor."
(2)Operate scan tool MB991958 according to the procedure below to display "Pulse check."

.....Select "Interactive Diagnosis."

.....Select "System select."

.....Select "SWS."

.....Select "Pulse Checking."
(3)Check that scan tool MB991958 sounds.

Q. Does scan tool MB991958 sound when each door is opened and closed?

When the door (LH) is opened and closed, scan tool MB991958 does not sound. : Go to Step 2.

When the door (RH) is opened and closed, scan tool MB991958 does not sound. : Go to Step 7.

When either door is opened and closed, scan tool MB991958 sounds. : Replace the ETACS-ECU. When the ETACS-ECU is replaced, register the encrypted code. Encrypted Code Registration Criteria Table. If the functions described in "CIRCUIT OPERATION" work normally, the input signal from the door switches should be normal.

STEP 2. Check door switch (LH) connector D-15 for loose, corroded or damaged terminals, or terminals pushed back in the connector.









Q. Is door switch (LH) connector D-15 in good condition?

YES Go to Step 3.

NO Repair or replace the damaged component(s). Harness Connector Inspection. If the functions described in "CIRCUIT OPERATION" work normally, the input signal from the door switch (LH) should be normal.

STEP 3. Check the door switch (LH).





Remove the door switch (LH). Service and Repair. Then check continuity between the switch terminals and the body ground.





Q. Is the door switch (LH) in good condition?

YES Go to Step 4.

NO Replace the door switch (LH). If the functions described in "CIRCUIT OPERATION" work normally, the input signal from the door switch (LH) should be normal.

STEP 4. Measure resistance at the lower metal part of the door switch (LH) in order to check the ground circuit to the door switch (LH).

NOTE:
Check that the door switch (LH) is grounded to the vehicle body via its mounting screw.





Remove the cap, and measure the resistance value between the lower metal part and ground.

- The resistance should be 2 ohms or less.

Q. Is the measured resistance 2 ohms or less?

YES Go to Step 5.

NO Check the installation of the switch, and repair if necessary. If the functions described in "CIRCUIT OPERATION" work normally, the input signal from the door switch (LH) should be normal.

STEP 5. Check ETACS-ECU connector C-217 for loose, corroded or damaged terminals, or terminals pushed back in the connector.





Q. Is ETACS-ECU connector C-217 in good condition?

YES Go to Step 6.

NO Repair or replace the damaged component(s). Harness Connector Inspection. If the functions described in "CIRCUIT OPERATION" work normally, the input signal from the door switch (LH) should be normal.

STEP 6. Check the wiring harness between door switch (LH) connector D-15 (terminal 2) and ETACS-ECU connector C-217 (terminal 10).

- Check the communication lines for open circuit and short circuit.

















NOTE:
Also check junction block connector C-208 for loose, corroded, or damaged terminals, or terminals pushed back in the connector. If junction block connector C-208 is damaged, repair or replace the damaged component(s) as described in Harness Connector Inspection Harness Connector Inspection.

Q. Is the wiring harness between door switch (LH) connector D-15 (terminal 2) and ETACS-ECU connector C-217 (terminal 10) in good condition?

YES Replace the ETACS-ECU. When the ETACS-ECU is replaced, register the encrypted code. Encrypted Code Registration Criteria Table. If the functions described in "CIRCUIT OPERATION" work normally, the input signal from the door switch (LH) should be normal.

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. If the functions described in "CIRCUIT OPERATION" work normally, the input signal from the door switch (LH) should be normal.

STEP 7. Check door switch (RH) connector D-01 for loose, corroded or damaged terminals, or terminals pushed back in the connector.









Q. Is door switch (RH) connector D-01 in good condition?

YES Go to Step 8.

NO Repair or replace the damaged component(s). Harness Connector Inspection. If the functions described in "CIRCUIT OPERATION" work normally, the input signal from the door switch (RH) should be normal.

STEP 8. Check the door switch (RH).





Remove the door switch (RH). Service and Repair. Then check continuity between the switch terminals and the body ground.





Q. Is the door switch (RH) in good condition?

YES Go to Step 9.

NO Replace the door switch (RH). If the functions described in "CIRCUIT OPERATION" work normally, the input signal from the door switch (RH) should be normal.

STEP 9. Measure resistance at the lower metal part of the door switch (RH) in order to check the ground circuit to the door switch (RH).

NOTE:
Check that the door switch (RH) is grounded to the vehicle body via its mounting screw.





Remove the cap, and measure the resistance value between the lower metal part and ground.

- The resistance should be 2 ohms or less.

Q. Is the measured resistance 2 ohms or less?

YES Go to Step 10.

NO Check the installation of the switch, and repair if necessary. If the functions described in "CIRCUIT OPERATION" work normally, the input signal from the door switch (RH) should be normal.

STEP 10. Check ETACS-ECU connector C-218 for loose, corroded or damaged terminals, or terminals pushed back in the connector.





Q. Is ETACS-ECU connector C-218 in good condition?

YES Go to Step 11.

NO Repair or replace the damaged component(s). Harness Connector Inspection. If the functions described in "CIRCUIT OPERATION" work normally, the input signal from the door switch (RH) should be normal.

STEP 11. Check the wiring harness between door switch (RH) connector D-01 (terminal 2) and ETACS-ECU connector C-218 (terminal 65).

- Check the communication lines for open circuit and short circuit.

















NOTE:
Also check intermediate connector C-11 for loose, corroded, or damaged terminals, or terminals pushed back in the connector. If intermediate connector C-11 is damaged, repair or replace the connector as described in Harness Connector Inspection Harness Connector Inspection.

Q. Is the wiring harness between door switch (RH) connector D-01 (terminal 2) and ETACS-ECU connector C-218 (terminal 65) in good condition?

YES Replace the ETACS-ECU. When the ETACS-ECU is replaced, register the encrypted code. Encrypted Code Registration Criteria Table. If the functions described in "CIRCUIT OPERATION" work normally, the input signal from the door switch (RH) should be normal.

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. If the functions described in "CIRCUIT OPERATION" work normally, the input signal from the door switch (RH) should be normal.

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