INSPECTION PROCEDURE O-10: Sunroof Switch: The ETACS-ECU does not Receive Any Signal from the Up, Open or Close/down Switch.: Diagnosis

Required Special Tools: 

• MB991223: Harness Set
• MB991958: Scan Tool (MUT-III Sub Assembly)
  • MB991824: Vehicles communication interface (V.C.I.)
  • MB991827: MUT-III USB cable
  • MB991911: MUT-III Main harness B
• MB991813: SWS monitor kit
  • MB991806: SWS monitor cartridge
  • MB991812: SWS monitor harness (for column-ECU)
  • MB991922: Probe harness

1. STEP 1. Verify the sunroof operation. 

   Q: Does the sunroof work normally? 

   • YES:  Go to Step 2.
   • NO:  Refer to INSPECTION PROCEDURE F-1: SUNROOF DOES NOT OPERATE  ."
2. STEP 2. Check sunroof motor assembly connector D-06 and ETACS-ECU connector C-118 for loose, corroded or damaged terminals, or terminals pushed back in the connector. 
   Fig 1: Identifying Sunroof Motor Assembly Connector D-06 (Eclipse)

   Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.
   Fig 2: Identifying ETACS-ECU Connector C-118

   Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.

   Q: Are sunroof motor assembly connector D-06 and ETACS-ECU connector C-118 in good condition? 

   • YES:  Go to Step 3.
   • NO:  Repair or replace the damaged component(s). Refer to HARNESS CONNECTOR INSPECTION . If the sunroof operates normally, it indicates that a correct signal is sent from the sunroof switch.
3. STEP 3. Check the wiring harness between sunroof motor assembly connector D-06 (terminal 10) and ETACS-ECU connector C-118 (terminal 59). 
   Fig 3: Identifying Sunroof Motor Assembly Connector D-06 (Eclipse)

   Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.
   Fig 4: Identifying ETACS-ECU Connector C-118

   Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.
   NOTE: Also check intermediate connector C-31 and joint connector C-78 for loose, corroded, or damaged terminals, or terminals pushed back in the connector. If intermediate connector C-31 or joint connector C-78 are damaged, repair or replace the damaged component(s) as described in HARNESS CONNECTOR INSPECTION .
   Fig 5: Identifying Intermediate Connector C-31 And Joint Connector C-78

   Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.

   Q: Is the wiring harness between sunroof motor assembly connector D-06 (terminal 10) and ETACS-ECU connector C-118 (terminal 59) in good condition? 

   • YES:  Go to Step 4.
   • 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 sunroof operates normally, it indicates that a correct signal is sent from the sunroof switch.
4. STEP 4. Replace the ECU. 
   1. Replace the sunroof motor assembly.
   2. If the sunroof operates normally, it indicates that a correct signal is sent from the sunroof switch.

   Q: Does the ETACS-ECU receive correct signals from the sunroof switch? 

   • YES:  No action is necessary and testing is complete.
   • NO:  Replace the ETACS-ECU. If the sunroof operates normally, it indicates that a correct signal is sent from the sunroof switch.