Inspection Procedure 1: The front and rear room lamp do not illuminate normally.


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











COMMENTS ON TROUBLE SYMPTOM


The ETACS-ECU operates the front room lamps and the rear room lamps in accordance with the following input signals.

If this function does not work normally, the input signal circuits from these components, the ETACS-ECU or the CAN bus lines may have a problem. Also, it may be possible that the room lamp delayed-off time is set to "0 second" through customisation or the security alarm is armed.

PROBABLE CAUSES



DIAGNOSIS PROCEDURE

STEP 1. M.U.T.-III CAN bus diagnostics
Use the M.U.T.-III to diagnose the CAN bus lines.

Q. Is the check result normal?
Go to Step 2
Repair the CAN bus line (Refer to GROUP 54C - Troubleshooting ).

STEP 2. Check ETACS customisation function
Use the customisation function of the ETACS to check that the room lamp delayed-off time is set to other than 0 second.

Q. Is the check result normal?
Go to Step 3.
Use the customisation function of the ETACS to set the room lamp delayed-off time to other than 0 second. (Refer to .)

STEP 3. Check whether the diagnosis code is set.
Check if the ETACS-ECU sets a diagnosis code.

Q. Is the diagnosis code set?
Diagnose ETACS-ECU (Refer to ETACS-ECU, Troubleshooting ).
Go to Step 4.

STEP 4. M.U.T.-III data list
Use the ETACS-ECU service data to check the signals related to the operation of front room lamp.

  • Move the electric motor switch to the LOCK (OFF) position.
  • Pull out the key from the electric motor switch
  • Open each door.
  • Open the tailgate.
Item No.
 Item name
 Normal condition
19
 Driver’s door switch
 ON
20
 Driver’s door unlock switch
 ON
28
 Steering lock switch
 OFF → ON
30
 IG SW (IG1) /Power SW(ON)
 ON
48
 Passenger’s door switch
 ON
49
 Rear door switch
 ON
OK: Normal condition is displayed.

Q. Is the check result normal?
YES <All the signals are received normally.> : Go to Step 5.
NO <The front door switch (driver’s side) signal is not received.> : Refer to inspection procedure 5 "The front door switch (driver’s side) signal is not received ."
NO <The front door lock actuator (driver’s side) signal is not received.> : Refer to inspection procedure 4 "The front door lock actuator (driver’s side) signal is not received ."
NO <The key reminder switch signal is not received.> : Refer to inspection procedure 3 "The key reminder switch signal is not received ."
NO <The electric motor switch (IG1) signal is not received.> : Refer to inspection procedure 2 "The electric motor switch (IG1) signal is not received ."
NO <The front door switch (passenger’s side) signal is not received.> : Refer to inspection procedure 6 "The front door switch (passenger’s side) signal is not received ."
NO <One of the door switch signals (including the tailgate latch switch) is not received.> : Refer to inspection procedure 7 "One of the door switch signals (including the tailgate latch switch) is not received ."

STEP 5. Connector check: B-304 ETACS-ECU connector, C-05 rear room lamp connector, C-07 intermediate connector

Q. Is the check result normal?
Go to Step 6.
Repair the defective connector.

STEP 6. Check the wiring harness from C-07 intermediate connector terminal No. 16 to B-304 ETACS-ECU connector terminal No. 20.
note Before checking the wiring harness, check B-301 junction block connecotor and B-05, B-06 joint connectors, and repair them if necessary.

  • Check the input line for open circuit.

Q. Is the check result normal?
Go to Step 7.
Repair the wiring harness.

STEP 7. Check the wiring harness from C-05 rear room lamp connector terminal No. 2 to B-304 ETACS-ECU connector terminal No. 18.
note Before the wiring harness check, check the B-301 junction block connector and C-07 intermediate connector, and repair if necessary.

  • Check the output lines for open circuit.

Q. Is the check result normal?
Go to Step 8.
Repair the wiring harness.

STEP 8. Retest the system.
Check that the front and rear room lamps illuminate and extinguish normally.

Q. Is the check result normal?
The trouble can be an intermittent malfunction (Refer to GROUP 00 - How to use Troubleshooting/inspection Service Points - How to Cope with Intermittent Malfunction ).
Replace the ETACS-ECU and register the ID codes (Refer to ).




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