Defogger - Except Lancer Evolution Mitsubishi Lancer Evolution X

SPECIAL TOOLS

SPECIAL TOOLS DESCRIPTION CHART Tool Tool number and name Supersession Application MB991223 MB991219 MB991220 MB991221 MB991222 Harness set Check harness LED harness LED harness adapter Probe General service tool (jumper) Continuity check and voltage measurement at harness wire or connector For checking connector pin contact pressure For checking power supply circuit For checking power supply circuit For connecting a locally sourced tester MB992006 Extra fine probe - Continuity check and voltage measurement at harness wire or connector

Scheme 1

Scheme 2

STANDARD FLOW OF DIAGNOSTIC TROUBLESHOOTING

Refer to TROUBLESHOOTING CONTENTS .

SYMPTOM CHART

SYMPTOM CHART

Scheme 3

Scheme 4

TECHNICAL DESCRIPTION (COMMENT)

The rear window defogger is able to turn on while engine is running. If the defogger does not operate when the rear window defogger switch is turned on, the rear window defogger relay system may be defective.

TROUBLESHOOTING HINTS

1. The heater control unit < vehicles without A/C > or A/C-ECU < vehicles with A/C > may be defective.
2. The rear window defogger relay may be defective.
3. The heater control panel < vehicles without A/C > or A/C control panel < vehicles with A/C > may be defective.
4. The ETACS-ECU may be defective.
5. Damaged harness wires or connectors

DIAGNOSIS

Required Special Tools

1. 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 (Vehicles with CAN communication system)
2. MB991223: Harness Set
3. MB992006: Extra Fine Probe

Scheme 5

Scheme 6

Scheme 7

Scheme 8

Scheme 9

Scheme 10

Scheme 11

1. STEP 1. Using scan tool MB991958, diagnose the CAN bus line. 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)»(/mitsubishi/lancer-evolution/x-2007-2016/remont/communication-devices/#electronic-time-and-alarm-control-system-etacs-except-lancer-evolution__how-to-connect-the-scan-tool) ." Turn the ignition switch to the "ON" position. Diagnose the CAN bus line. 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 «DIAGNOSIS»(/mitsubishi/lancer-evolution/x-2007-2016/remont/communication-devices/#controller-area-network-can-except-lancer-evolution__diagnosis) ).
2. STEP 2. Check the A/C and outside/inside air selection damper control motor operation. Turn the ignition switch to the "ON" position. Check the engine running. Check the operations of outside/inside air selection damper control motor and A/C. Q: Do the A/C and outside/inside air selection damper control motor work normally? YES: Go to Step 3. NO: Refer to «INSPECTION PROCEDURE 2, "MALFUNCTION OF THE A/C-ECU POWER SUPPLY SYSTEM»(/mitsubishi/lancer-evolution/x-2007-2016/remont/automatic-hvac-system/#heating-air-conditioning-and-ventilation-except-lancer-evolution) < vehicles without A/C > or «INSPECTION PROCEDURE 2: MALFUNCTION OF THE A/C-ECU POWER SUPPLY SYSTEM»(/mitsubishi/lancer-evolution/x-2007-2016/remont/automatic-hvac-system/#heating-air-conditioning-and-ventilation-except-lancer-evolution) < vehicles with A/C >."
3. STEP 3. Using scan tool MB991958, read the A/C-ECU diagnostic trouble code. Check that the A/C-ECU has not set a DTC. Q: Is the DTC set? YES: Carry out the DTC procedures. Refer to «DIAGNOSIS»(/mitsubishi/lancer-evolution/x-2007-2016/remont/automatic-hvac-system/#heating-air-conditioning-and-ventilation-except-lancer-evolution__diagnostic-trouble-code-chart) . NO: Go to Step 4.
4. STEP 4. Using scan tool MB991958, read the ETACS-ECU diagnostic trouble code. Check that the ETACS-ECU has not set a DTC. Q: Is the DTC set? YES: Carry out the DTC procedures. Refer to «DIAGNOSTIC TROUBLE CODE CHART»(/mitsubishi/lancer-evolution/x-2007-2016/remont/communication-devices/#electronic-time-and-alarm-control-system-etacs-except-lancer-evolution__diagnostic-trouble-code-chart) . NO: Go to Step 5.
5. STEP 5. Using scan tool MB991958, check data list. Use the heater control unit < vehicles without A/C > or A/C-ECU < vehicles with A/C > data list to check the signals related to the rear window defogger switch. Start the engine. Turn the rear window defogger switch from off to on. CONDITION REFERENCE CHART Item No. Item name Normal conditions Item 60 Rear defogger switch OFF --> ON Q: Does scan tool MB991958 display the items "ON", and "OFF" as normal condition? YES: Go to Step 6 NO: Replace the heater control panel < vehicles without A/C > or A/C control panel < vehicles with A/C >.
6. STEP 6. Check rear window defogger relay connector C-306 for loose, corroded or damaged terminals, or terminals pushed back in the connector. Q: Is rear window defogger relay connector C-306 in good condition? YES: Go to Step 7. NO: Repair or replace the connector. Refer to «HARNESS CONNECTOR INSPECTION»(/mitsubishi/lancer-evolution/x-2007-2016/remont/body-electrical/#general-electrical-except-lancer-evolution) . The rear window defogger system should work normally.
7. STEP 7. Check the rear window defogger relay continuity. Follow the table below to check the rear window defogger relay for continuity. REAR WINDOW DEFOGGER RELAY CONTINUITY CHECK Battery voltage Terminal number Normal condition With no current applied 3 - 4 No continuity With current applied [terminal 1 (-), terminal 2 (+)] Continuity exists (2 ohms or less) Q: Is the rear window defogger relay in good condition? YES: Go to Step 8. NO: Replace the rear window defogger relay. The rear window defogger system should work normally.
8. STEP 8. Check rear window defogger connector F-25 for loose, corroded or damaged terminals, or terminals pushed back in the connector. Q: Are rear window defogger connector F-25 in good condition? YES: Go to Step 9. NO: Repair or replace the connector. Refer to «HARNESS CONNECTOR INSPECTION»(/mitsubishi/lancer-evolution/x-2007-2016/remont/body-electrical/#general-electrical-except-lancer-evolution) . The rear window defogger system should work normally.
9. STEP 9. Measure the voltage at rear window defogger connector F-25. Disconnect rear window defogger connector F-25, and measure the voltage at the harness side. Start the engine. Rear window defogger switch: ON (measure within 20 seconds after the switch is turned on) Measure the voltage between rear window defogger connector F-25 terminal No. 1 and ground. The measured value should be approximately 12 volts (battery positive voltage). Q: Is the measured voltage approximately 12 volts? YES: Go to Step 10. NO: Go to Step 11 .
10. STEP 10. Measure the resistance at rear window defogger connector F-04. Disconnect rear window defogger connector F-04, and measure at the wiring harness side. Measure the resistance between terminal 1 and ground. The measured value should be 2 ohms or less. Q: Does the measured resistance value correspond with this range? YES: Go to Step 19 . NO: Repair the wiring harness. Check that the rear window defogger system works normally.
11. STEP 11. Measure the voltage at rear window defogger relay connector C-306. Disconnect rear window defogger relay connector C-306, and measure the voltage at the junction block side. Measure the voltage between terminal 4 and ground. The measured value should be approximately 12 volts (battery positive voltage). Q: Is the measured voltage approximately 12 volts? YES: Go to Step 13 . NO: Go to Step 12.
12. STEP 12. Check the wiring harness between rear window defogger relay connector C-306 (terminal 4) and the fusible link (37). NOTE: Also check intermediate connector C-129 for loose, corroded, or damaged terminals, or terminals pushed back in the connector. If intermediate connector C-129 is damaged, repair or replace the connector as described in «HARNESS CONNECTOR INSPECTION»(/mitsubishi/lancer-evolution/x-2007-2016/remont/body-electrical/#general-electrical-except-lancer-evolution) . Q: Is the wiring harness between rear window defogger relay connector C-306 (terminal 4) and the fusible link (37) in good condition? YES: The trouble can be an intermittent malfunction (Refer to «HOW TO COPE WITH INTERMITTENT MALFUNCTION»(/mitsubishi/lancer-evolution/x-2007-2016/remont/hoistjack/#general-information-except-lancer-evolution__how-to-cope-with-intermittent-malfunctions) ). NO: Repair the wiring harness. Check that the rear window defogger system works normally.
13. STEP 13. Measure the voltage at rear window defogger relay connector C-306. Disconnect rear window defogger relay connector C-306, and measure the voltage at the junction block side. Turn the ignition switch to the "ON" position. Measure the voltage between terminal 2 and ground. The measured value should be approximately 12 volts (battery positive voltage). Q: Is the measured voltage approximately 12 volts? YES: Go to Step 14. NO: Go to Step 16 .
14. STEP 14. Check ETACS-ECU connector C-301 for loose, corroded or damaged terminals, or terminals pushed back in the connector. Q: Is ETACS-ECU connector C-301 in good condition? YES: Go to Step 15. NO: Repair or replace the connector. Refer to «HARNESS CONNECTOR INSPECTION»(/mitsubishi/lancer-evolution/x-2007-2016/remont/body-electrical/#general-electrical-except-lancer-evolution) . Check that the rear window defogger system works normally.
15. STEP 15. Check the wiring harness between rear window defogger relay connector C-306 (terminal 1) and ETACS-ECU C-301 (terminal 12). Q: Is the wiring harness between rear window defogger relay connector C-306 (terminal 1) and ETACS-ECU connector C-301 (terminal 12) in good condition? YES: Go to Step 18 . NO: Repair the wiring harness. Check that the rear window defogger system works normally.
16. STEP 16. Check heater control panel connector C-136 < vehicles without A/C > or A/C control panel connector C-120 < vehicles with A/C > for loose, corroded or damaged terminals, or terminals pushed back in the connector. Q: Are heater control panel connector C-136 < vehicles without A/C > or A/C control panel connector C-120 < vehicles with A/C > in good condition? YES: Go to Step 17. NO: Repair or replace the connector. Refer to «HARNESS CONNECTOR INSPECTION»(/mitsubishi/lancer-evolution/x-2007-2016/remont/body-electrical/#general-electrical-except-lancer-evolution) . The rear window defogger system should work normally.
17. STEP 17. Check the wiring harness between rear window defogger relay connector C-306 (terminal 2) and ETACS-ECU connector C-317 (terminal 5). Check the wiring harness for open circuit and short circuit. NOTE: Also check joint connector C-03 for loose, corroded, or damaged terminal, or terminal pushed back in the connector. If joint connector C-03 is damaged, repair or replace the connector as described in «HARNESS CONNECTOR INSPECTION»(/mitsubishi/lancer-evolution/x-2007-2016/remont/body-electrical/#general-electrical-except-lancer-evolution) . Q: Is the wiring harness between rear window defogger relay connector C-306 (terminal 2) and ETACS-ECU connector C-317 (terminal 5) in good condition? YES: The trouble can be an intermittent malfunction (Refer to «HOW TO COPE WITH INTERMITTENT MALFUNCTION»(/mitsubishi/lancer-evolution/x-2007-2016/remont/hoistjack/#general-information-except-lancer-evolution__how-to-cope-with-intermittent-malfunctions) ). NO: Repair or replace the wiring harness. Refer to «HARNESS CONNECTOR INSPECTION»(/mitsubishi/lancer-evolution/x-2007-2016/remont/body-electrical/#general-electrical-except-lancer-evolution) . Check that the rear window defogger system works normally.
18. STEP 18. Check the wiring harness between rear window defogger relay connector C-306 (terminal 3) and rear window defogger connector F-25 (terminal 1). NOTE: Also check intermediate connectors C-36 and D-15 for loose, corroded, or damaged terminals, or terminals pushed back in the connector. If intermediate connectors C-36 and D-15 is damaged, repair or replace the connector as described in «HARNESS CONNECTOR INSPECTION»(/mitsubishi/lancer-evolution/x-2007-2016/remont/body-electrical/#general-electrical-except-lancer-evolution) . Q: Is the wiring harness between rear window defogger relay connector C-306 (terminal 3) and rear window defogger connector F-25 (terminal 1) in good condition? YES: Replace the ETACS-ECU. NO: Repair or replace the wiring harness. Refer to «HARNESS CONNECTOR INSPECTION»(/mitsubishi/lancer-evolution/x-2007-2016/remont/body-electrical/#general-electrical-except-lancer-evolution) . Check that the rear window defogger system works normally.
19. STEP 19. Check heater control unit connector C-48 < vehicles without A/C > or A/C-ECU connector C-20 < vehicles with A/C > for loose, corroded or damaged terminals, or terminals pushed back in the connector. Q: Is heater control unit connector C-48 < vehicles without A/C > or A/C-ECU connector C-20 < vehicles with A/C > in good condition? YES: Go to Step 20. NO: Repair or replace the connector. Refer to «HARNESS CONNECTOR INSPECTION»(/mitsubishi/lancer-evolution/x-2007-2016/remont/body-electrical/#general-electrical-except-lancer-evolution) . Check that the rear window defogger system works normally.
20. STEP 20. Check the wiring harness between heater control unit connector C-48 < vehicles without A/C > or A/C-ECU connector C-20 < vehicles with A/C > (terminals 9) and heater control panel connector C-136 < vehicles without A/C > or A/C control panel connector C-120 < vehicles with A/C > (terminals 9). Check the wiring harness for open circuit and short circuit. Q: Are the wiring harness between heater control unit connector C-48 < vehicles without A/C > or A/C-ECU connector C-20 < vehicles with A/C > (terminals 9) and heater control panel connector C-136 < vehicles without A/C > or A/C control panel connector C-120 < vehicles with A/C > (terminals 9) in good condition? YES: Go to Step 21. NO: Repair or replace the wiring harness. Refer to «HARNESS CONNECTOR INSPECTION»(/mitsubishi/lancer-evolution/x-2007-2016/remont/body-electrical/#general-electrical-except-lancer-evolution) . Check that the rear window defogger system works normally.
21. STEP 21. Check the rear window defogger. Let the engine run at 2,000 r/min, and check the printed heater with the battery fully charged. Turn on the rear window defogger switch, and use a voltmeter to measure the voltage in each printed heater at middle point A on the rear window glass. The value should be approximately 6 volts. Q: Does the rear window defogger work normally? YES: Return to Step 1 . NO: Replace the rear window defogger.

REMOVAL AND INSTALLATION

Refer to HEATER CONTROL UNIT .

PRINTED HEATER CHECK

1. Let the engine run (2,000 r/min), and check the printed heater with the battery fully charged.
2. With the rear window defogger switch "ON," use the circuit tester to measure the voltage of each printed heater at the rear window glass center A point. If approximately 6 V is indicated, it is judged good.
3. If the voltage of 12 V is indicated at the A point, there is an open circuit between the A point and negative terminal. Therefore, by moving the test bar slowly to the negative side, search and determine the location where the voltage changes suddenly (0 V). The location of voltage change indicates the open circuit position.
4. Also, if the voltage indicates 0 V at the A point, there is an open circuit between the A point and positive terminal. Therefore, search and determine the location of voltage change (12 V) using the above mentioned method.
5. If a malfunction such as open circuit occurs, replace the rear window glass < LANCER > or liftgate window glass < LANCER SPORTBACK >.(Refer to «REAR WINDOW GLASS»(/mitsubishi/lancer-evolution/x-2007-2016/remont/windows/#window-glass-except-lancer-evolution) < LANCER > or «LIFTGATE WINDOW GLASS»(/mitsubishi/lancer-evolution/x-2007-2016/remont/windows/#window-glass-except-lancer-evolution) < LANCER SPORTBACK >.)

REAR WINDOW DEFOGGER RELAY CHECK

REAR WINDOW DEFOGGER RELAY CHECK

See also:
• TROUBLESHOOTING CONTENTS
• HOW TO CONNECT THE SCAN TOOL (M.U.T.-III)
• DIAGNOSIS
• INSPECTION PROCEDURE 2, "MALFUNCTION OF THE A/C-ECU POWER SUPPLY SYSTEM
• DIAGNOSIS
• DIAGNOSTIC TROUBLE CODE CHART
• HARNESS CONNECTOR INSPECTION
• HOW TO COPE WITH INTERMITTENT MALFUNCTION
• REAR WINDOW GLASS
• REAR WINDOW DEFOGGER DOES NOT OPERATE.