Inspection Procedure 1: The Front Room Lamp does not Illuminate Normally.


caution Whenever the ECU is replaced, ensure that the power supply circuit, the earth circuit and the communication circuit are normal.








OPERATION




  • Ignition switch (IG1)
  • Key reminder switch
  • Door switches
  • Front door lock actuator (driver’s side)

COMMENTS ON TROUBLE SYMPTOM



PROBABLE CAUSES



  • Malfunction of the key reminder switch
  • Malfunction of door switch
  • Malfunction of the front door lock actuator (driver’s side)
  • Malfunction of front room lamp
  • Malfunction of the ETACS-ECU
  • Damaged harness wires and connectors

DIAGNOSIS PROCEDURE


STEP 1. Rear room lamp operation check



Q. Is the check result normal?





STEP 2. M.U.T.-III diagnosis code



Q. Is the diagnosis code set?





STEP 3. M.U.T.-III data list




  • Turn the ignition switch to the LOCK (OFF) position.
  • Remove the ignition key from the ignition key cylinder.
  • Open each door.
Item No.
 Item name
 Normal condition
Item 228
 Dr door unlock
 ON
Item 254
 IG voltage
 0 V
Item 256
 Dr door ajar switch
 Open
Item 257
 As door ajar switch
 Open
Item 258
 RR door ajar switch
 Open
Item 259
 RL door ajar switch
 Open
Item 264
 Handle lock switch
 Key in → Key out
OK: Normal conditions are displayed for all the items.

Q. Is the check result normal?

















STEP 4. Connector check: D-03 front room lamp connector


Q. Is the check result normal?





STEP 5. Front room lamp bulb check



Q. Is the check result normal?





STEP 6. Connector check: C-316 ETACS-ECU connector


Q. Is the check result normal?





STEP 7. Wiring harness check between the D-03 front room lamp connector terminal No. 2/3 and the C-316 ETACS-ECU connector terminal No. 6/5



  • Check the input/output line for open circuit.

Q. Is the check result normal?





STEP 8. Connector check: D-03 front room lamp connector


Q. Is the check result normal?





STEP 9. Wiring harness check between the D-03 front room lamp connector terminal No. 1 and the body earth



  • Check the output lines for open circuit.

Q. Is the check result normal?





STEP 10. Retest the system



Q. Is the check result normal?