Inspection Procedure 1: The front room lamp does not illuminate normally.


caution
  • Before replacing the ECU, ensure that the power supply circuit, the earth circuit and the communication circuit are normal.
  • When the ETACS-ECU of vehicles without KOS is replaced, the encrypted code of the ignition key needs to be registered to the ETACS-ECU. (If the encrypted code is not registered, the engine cannot be started. Register the encrypted code as described in Immobilizer System - How to Register Key ID .)

OPERATION


The ETACS-ECU illuminates and extinguishes the front room lamp in accordance with the input signals below.

COMMENTS ON TROUBLE SYMPTOM


If this does not work normally, the above switch input circuit(s), front room lamp, or ETACS-ECU may have a problem.

PROBABLE CAUSES



DIAGNOSIS PROCEDURE


STEP 1. Rear room lamp operation check


Check that the rear room lamp illuminates and extinguishes normally.

Q. Is the check result normal?

Go to Step 4.

Go to Step 2.

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


Check if diagnosis code is set to the ETACS-ECU.

Q. Is the diagnosis code set?

Troubleshoot the ETACS-ECU. Refer to .

Go to Step 3.

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


Use the ETACS-ECU service data to check the signals related to the operation of front room lamp.

Item No.
 Item name
 Normal condition
Item 228
 Dr door unlock
 ON
Item 254
 IG voltage
 1 V or less
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?

Normal conditions are displayed for all the items. : Replace the ETACS-ECU.

Normal condition is not displayed for item No. 228. : Troubleshoot the ETACS-ECU. Refer to Inspection Procedure 4 "The front door lock actuator (driver’s side) signal is not received" .

Normal condition is not displayed for item No. 254. : Troubleshoot the ETACS-ECU. Refer to Inspection Procedure 2 "The ignition switch (IG1) signal is not received" .

Normal condition is not displayed for item No. 256. : Troubleshoot the ETACS-ECU. Refer to Inspection Procedure 5 "The front door switch (driver’s side) signal is not received" .

Normal condition is not displayed for item No. 257. : Troubleshoot the ETACS-ECU. Refer to Inspection Procedure 6 "The front door switch (passenger’s side) signal is not received" .

Normal condition is not displayed for item No. 258. : Troubleshoot the ETACS-ECU. Refer to Inspection Procedure 7 "The rear door switch (RH) signal is not received" .

Normal condition is not displayed for item No. 259. : Troubleshoot the ETACS-ECU. Refer to Inspection Procedure 8 "The rear door switch (LH) signal is not received" .

Normal condition is not displayed for item No. 264. : Troubleshoot the ETACS-ECU. Refer to Inspection Procedure 3 "Key reminder switch signal is not received" .

STEP 4. Front room lamp bulb check


Check that the front room lamp bulb is normal.

Q. Is the check result normal?

Go to Step 5.

Replace the front room lamp bulb.

STEP 5. Check of open circuit in (LP+1, LP+2, LP+3&LP+4) line between the front room lamp connector and ETACS-ECU connector.


Q. Is the check result normal?

Go to Step 6.

Repair the connector(s) or wiring harness.

STEP 6. Check of open circuit in (RLP-1, RLP-2&RLP-3) line between the front room lamp connector and ETACS-ECU connector.


Q. Is the check result normal?

Go to Step 7.

Repair the connector(s) or wiring harness.

STEP 7. Check of open circuit in earth line between the front room lamp connector and body earth.


Q. Is the check result normal?

Replace the front room lamp, and then go to Step 8.

Repair the connector(s) or wiring harness.

STEP 8. Retest the system


Check that the front room lamp illuminates/extinguishes 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.