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Home >> Mitsubishi >> 2008 >> Lancer L4-2.0L (4B11) >> Repair and Diagnosis >> Accessories and Optional Equipment >> Radio, Stereo, and Compact Disc >> Testing and Inspection >> Symptom Related Diagnostic Procedures >> Inspection Procedure 1

Inspection Procedure 1

Inspection Procedure 1: Power is not turned ON when the power switch is turned ON.

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

Radio And CD Player Or CD Changer Power Supply Circuit (Part 1):




Radio And CD Player Or CD Changer Power Supply Circuit (Part 2):






OPERATION
When the ignition switch is in the ON or ACC position, the radio and CD player or CD changer power can be turned ON. With the radio and CD player or CD changer power ON, when the ignition switch is turned to the OFF position, the power for radio and CD player or CD changer is also turned OFF.

COMMENTS ON TROUBLE SYMPTOM
Provided that the audio diagnostic trouble code is not set, if the power for radio and CD player or CD changer cannot be turned ON, the radio and CD player or CD changer, or power supply circuit for radio and CD player or CD changer may have a problem, or the option coding information may be inconsistent.

PROBABLE CAUSES
- Malfunctions of radio and CD player or CD changer
- Malfunction of the ETACS-ECU
- Option coding information inconsistency
- Damaged harness wires and connectors

DIAGNOSIS

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

STEP 1. ETACS-ECU coding data check.

1. Operate scan tool MB991958 to read the ETACS-ECU option coding information (Refer to general (Body and Chassis) Coding Table).
2. Check that the "AUDIO" is set to "enabled."

Q: Is the check result normal?

YES : Go to Step 2.

NO : Operate scan tool MB991958 to set the option coding "AUDIO" to "enabled," and check the trouble symptom.

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

Check if the diagnostic trouble code is set to the ETACS-ECU.

Q: Is the check result normal?

YES : Troubleshoot the ETACS-ECU (Refer to Chassis electrical, Diagnosis). Diagnostic Trouble Code Descriptions

NO : Go to Step 3.

STEP 3. Check ETACS-ECU connector C-317 and radio and CD player or CD changer connector C-104 for loose, corroded or damaged terminals, or terminals pushed back in the connector.

Q: Are ETACS-ECU connector C-317 and radio and CD player or CD changer connector C-104 in good condition?

YES : Go to Step 4.

NO : Repair or replace the damaged component(s) (Refer to general (electrical) Harness Connector Inspection). The steering remote control switch should work normally.

STEP 4. Check the wiring harness between ETACS-ECU connector C-317 (terminal 1) and radio and CD player or CD changer connector C-104 (terminal 30).
- Check the power supply lines (battery power supply) for open circuit.

Q: Is the wiring harness between ETACS-ECU connector C-317 (terminal 1) and radio and CD player or CD changer connector C-104 (terminal 30) in good condition?

YES : Go to Step 5.

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.

STEP 5. Using scan tool MB991958, check data list.

Check the input signal of ACC relay.

- Turn the ignition switch to the ACC position.






OK: Normal condition is displayed.

Q: Is the check result normal?

YES : Go to Step 6.

NO : Refer to chassis electrical, ETACS, Diagnosis-Inspection Procedure 1 "The ignition switch (ACC) signal is not received". Inspection Procedure 1

STEP 6. Check the power supply circuit to the ETACS-ECU. Measure the voltage at ETACS-ECU connector C-309.

1. Disconnect the connector, and measure at the wiring harness-side connector.
2. Turn the ignition switch to the "ACC" position.




3. Measure the voltage between terminal 2 and ground.

OK: Battery voltage

Q: Is the measured voltage battery voltage?

YES : Go to Step 8.

NO : Go to Step 7.

STEP 7. Check the wiring harness between ETACS-ECU connector C-309 (terminal 2) and fusible link (37)
- Check the power supply line for open circuit and short circuit.

Q: Is the wiring harness between ETACS-ECU connector C-309 (terminal 2) and fusible link (37) in good condition?

YES : Go to Step 8.

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.

STEP 8. Check ETACS-ECU connector C-315 for loose, corroded or damaged terminals, or terminals pushed back in the connector.

Q: Is ETACS-ECU connector C-315 in good condition?

YES : Go to Step 9.

NO : Repair or replace the damaged component (Refer to general (electrical) Harness Connector Inspection). The steering remote control switch should work normally.

STEP 9. Check the power supply circuit to the ETACS-ECU. Measure the voltage at ETACS-ECU connector C-315.

1. Disconnect the connector, and measure at the ETACS-ECU side connector.
2. Turn the ignition switch to the "ACC" position.




3. Measure voltage between terminal 9 and ground.

OK: Battery voltage

Q: Is the measured voltage battery voltage?

YES : Go to Step 10.

NO : Replace the ETACS-ECU.

STEP 10. Check the wiring harness between radio and CD player or CD changer connector C-104 (terminal 21) and ETACS-ECU connector C-315 (terminal 9).

- Check the power supply line for open circuit.

NOTE: Also check joint connector C-07 for loose, corroded, or damaged terminals, or terminals pushed back in the connector. If joint connector C-07 is damaged, repair or replace the connector as described in general (electrical) Harness Connector Inspection.

Q: Is the wiring harness between radio and CD player or CD changer connector C-104 (terminal 21) and ETACS-ECU connector C-315 (terminal 9) in good condition?

YES : Go to Step 11.

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.

STEP 11. Check the ground circuit to the radio and CD player or CD changer. Measure the resistance at radio and CD player or CD changer connector C-104.

1. Disconnect the connector, and measure at the wiring harness side.




2. Measure resistance between terminal 40 and ground.

OK: The resistance should be 2 ohm or less.

Q: Is the measured resistance 2 ohms or less?

YES : Go to Step 13.

NO : Go to Step 12.

STEP 12. Check the wiring harness between radio and CD player or CD changer connector C-104 (terminal 40) and ground.
- Check the ground wires for open circuit.

Q: Is the wiring harness between radio and CD player or CD changer connector C-104 (terminal 40) and ground in good condition?

YES : Check the trouble symptom.

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.

STEP 13. Retest the system

Check if the radio and CD player or CD changer power is turned ON.

Q: Is the check result normal?

YES : The trouble can be an intermittent malfunction (Refer to general (Body and Chassis) How to use Troubleshooting/inspection Service Points How to Cope with Intermittent Malfunction).

NO : Replace the radio and CD player or CD changer.
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