Inspection Procedure O-2: The room lamp does not illuminate normally. <Vehicles without keyless entry system>


caution Whenever the ECU is replaced, ensure that the input and output signal circuits are normal.


COMMENTS ON TROUBLE SYMPTOM
If the room lamp does not illuminate or extinguish normally, wiring harness connector(s) or the bulb may be defective.

POSSIBLE CAUSES

  • Malfunction of the interior lamp switches
  • Malfunction of the room lamp bulbs
  • Damaged harness wires and connectors

DIAGNOSTIC PROCEDURE

Step 1. SWS monitor data list
<Selected item> ETACS ECU
  • Driver’s door is open
Item No.
 Item name
 Normal condition
Item 32
 DR DOOR SW
 ON
OK: Normal condition is displayed.

Q. Is the check result normal?
Go to Step 2.
Refer to inspection procedure P-5 "The driver’s door switch signal is not received <LH drive vehicles> or <RH drive vehicles> ."

Step 2. ETACS switch data by using the SWS monitor
Check the ETACS-ECU signal related to the room lamp illumination.

  • Ignition switch: OFF (key inserted)
Item No.
 Item name
 Normal condition
Item 03
 KEY REMINSW
 OFF

  • Passenger’s door: Close → Open
Item No.
 Item name
 Normal condition
Item 05
 PASS DOOR SW
 from OFF to ON

  • Tailgate: Close → Open
Item No.
 Item name
 Normal condition
Item 07
 TRK LID LA SW
 from OFF to ON

  • Rear door (RH): Close → Open
Item No.
 Item name
 Normal condition
Item 41
 R.DOOR(RH) SW
 from OFF to ON

  • Rear door (LH): Close → Open
Item No.
 Item name
 Normal condition
Item 42
 R.DOOR(LH) SW
 from OFF to ON

  • Driver’s door: Unlock → Lock
Item No.
 Item name
 Normal condition
Item 21
 DR DOR LOK SW
 from OFF to ON
Item 22
 DR DOR ULOK SW
 from ON to OFF
OK: Normal conditions displayed for all the items.

Q. Is the check result normal?
Normal conditions are displayed for all the items. : Go to Step 3.
Normal condition is not displayed for item No.03 : Refer to inspection procedure P-10 "The key reminder switch signal is not received ."
Normal condition is not displayed for item No.05, 07, 41 or 42 : Refer to inspection procedure P-12 "All the door switch signals are not received ."
Normal condition is not displayed for item No.21 and 22 : Refer to inspection procedure P-13 "The driver’s door lock actuator switch signal is not received <LH drive vehicles> or <RH drive vehicles> ."

Step 3. Pulse check
Check the input signals below, which is related to the room lamp.
System switch
 Check condition
Interior lamp ON switch
 When turned from OFF to ON
Interior lamp OFF switch
 When turned from ON to OFF
OK: The M.U.T.-III sounds or the voltmeter needle fluctuates.

Q. Is the check result normal?
Go to Step 4.
Refer to inspection procedure P-20 "The interior lamp "all on" or "all off" switch signal is not sent to the ETACS-ECU ."

Step 4. Retest the system.
Check that the right or left room lamp illuminates when the interior lamp switch is operated.

Q. Is the check result normal?
Go to Step 7.
Go to Step 5.

Step 5. Connector check: C-219 ETACS-ECU connector and E-02 room lamp connector




Q. Is the check result normal?

Go to Step 6.

Repair the defective connector.

Step 6. Check the wiring harness from C-219 ETACS-ECU connector terminal No.6 to E-02 room lamp connector terminal No.10.








note Prior to the wiring harness inspection, check intermediate connector E-11 and junction block connector C-211, and repair if necessary.

  • Check the power supply line for open circuit.

Q. Is the check result normal?

Replace the room lamp.

Repair the wiring harness.

Step 7. Check the room lamp switch.
Check which position (ON or DOOR) of the room lamp switch does not activate the room lamp.

Q. Which switch position does not activate the lamp?
The lamp illuminates at neither the ON nor DOOR position. : Go to Step 8.
The lamp does not illuminate at the ON position. : Go to Step 8.
The lamp does not illuminate at the DOOR position. : Go to Step 10.

Step 8. Connector check: E-02 room lamp connector


Q. Is the check result normal?

Go to Step 9.

Repair the defective connector.

Step 9. Check the bulbs of the room lamp.
Check that the room lamp bulbs are not burned out.

Q. Is the check result normal?
Replace the room lamp.
Replace the room lamp bulb.

Step 10. Connector check: E-02 room lamp connector


Q. Is the check result normal?

Go to Step 11.

Repair the defective connector.

Step 11. Check the bulbs of the room lamp.
Check that the room lamp bulbs are not burned out.

Q. Is the check result normal?
Go to Step 12.
Replace the room lamp bulb.

Step 12. Connector check: C-219 ETACS-ECU connector


Q. Is the check result normal?

Go to Step 13.

Repair the defective connector.

Step 13. Check the wiring harness from C-219 ETACS-ECU connector terminal No.5 to E-02 room lamp connector terminal No.8.








note Prior to the wiring harness inspection, check intermediate connector E-11 and junction block connector C-211, and repair if necessary.

  • Check the earth wires for open circuit.

Q. Is the check result normal?

Replace the room lamp.

Repair the wiring harness.