Inspection Procedure 7: The Foot Lamps and Ceiling Lamp do not Illuminate or Extinguish 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

The ETACS-ECU operates the foot lamps and ceiling lamp in accordance with the input signals below.

Ignition switch (IG1)
Door switches
Back door switch
Driver’s door lock actuator switch (unlock switch)
Interior lamp switch

If this function does not work normally, these input signal circuit(s) or the ETACS-ECU may be defective.

PROBABLE CAUSES

Malfunction of the door switches
Malfunction of the room lamp switches
Malfunction of the driver’s door lock actuator switch (unlock switch)
Malfunction of the ETACS-ECU
Damaged harness wires and connectors

DIAGNOSIS PROCEDURE

STEP 1. SWS monitor data list

<Selected item> ETACS ECU

Driver’s door is open

Item No.	Item name	Normal condition
Item 32	FRONT DOOR SW	ON

OK: Normal condition is displayed.

Q. Is the check result normal?

Go to Step 2.

Refer to ETACS - Input Signal Chart

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 reminder switch	OFF

Passenger’s door: Close → Open

Item No.	Item name	Normal condition
Item 05	Passenger’s door switch	from OFF to ON

Back door: Close → Open

Item No.	Item name	Normal condition
Item 07	Rear and back gate door switch	from OFF to ON

Rear door (RH): Close → Open

Item No.	Item name	Normal condition
Item 41	Rear door (right side) switch	from OFF to ON

Rear door (LH): Close → Open

Item No.	Item name	Normal condition
Item 42	Rear door (left side) switch	from OFF to ON

Driver’s door: Unlock → Lock

Item No.	Item name	Normal condition
Item 22	Dr door lock actuator unlock SW	from ON to OFF

OK: Normal conditions are displayed for all the items.

Q. Is the check result normal?

YES (Normal conditions are displayed for all the items)

: Go to Step 3.

NO (Normal condition is not displayed for item No.03) : Refer to ETACS - Input Signal Chart

.

NO (Normal condition is not displayed for item No.05, 07, 41 or 42) : Refer to ETACS - Input Signal Chart

.

NO (Normal condition is not displayed for item No.22) : Refer to ETACS - Input Signal Chart

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 ETACS - Input Signal Chart

STEP 4. Retest the system.

Check that the foot lamp and ceiling lamp illuminates when the interior lamp switch is operated.

Q. Is the check result normal?

The trouble can be an intermittent malfunction (Refer to GROUP 00 - How to Cope with Intermittent Malfunction

Go to Step 5.

STEP 5. Check the illumination of the foot lamps and the ceiling lamp.

Check that the foot lamps and ceiling lamp light up/off when the interior lamp switch is turned to the ON/OFF position.

Q. Which of the foot lamps or the ceiling lamp does no illuminate or extinguish?

YES (All of the lamps illuminate normally) : The procedure is complete.

NO (The front foot lamp (RH or LH) does not illuminate normally)

: Go to Step 6.

NO (The rear foot lamp does not illuminate normally)

: Go to Step 9.

NO (The ceiling lamp does not illuminate normally)

: Go to Step 13.

STEP 6. Connector check: D-420 ETACS-ECU connector, D-17 front foot lamp (RH) connector, D-26 front foot lamp (LH) connector

Q. Is the check result normal?

Go to Step 7.

Repair the defective connector.

STEP 7. Check the wiring harness from D-420 ETACS-ECU connector terminal No.71 to D-17 front foot lamp (RH) connector terminal No.1 or D-26 front foot lamp (LH) connector terminal No.1.

note

Prior to the wiring harness inspection, check joint connector D-34 and repair if necessary.

Check the power supply line for open circuit.

Q. Is the check result normal?

Go to Step 8.

Repair the wiring harness.

STEP 8. Check the wiring harness from D-420 ETACS-ECU connector terminal No.69 to D-17 front foot lamp (RH) connector terminal No.2 or D-26 front foot lamp (LH) connector terminal No.2.

note

Prior to the wiring harness inspection, check joint connector D-34 and repair if necessary.

Check the earth wires for open circuit.

Q. Is the check result normal?

Replace the front foot lamp.

Repair the wiring harness.

STEP 9. Connector check: D-419 ETACS-ECU connector, E-125 rear foot lamp connector

Q. Is the check result normal?

Go to Step 10.

Repair the defective connector.

STEP 10. Check the wiring harness from D-419 ETACS-ECU connector terminal No.6 to E-125 rear foot lamp connector terminal No.1.

note

Prior to the wiring harness inspection, check intermediate connector D-219 <L.H. drive vehicles>, joint connector D-34 <L.H. drive vehicles> and junction block connector D-410 <L.H. drive vehicles>, D-422 <R.H. drive vehicles> and repair if necessary.

Check the power supply line for open circuit.

Q. Is the check result normal?

Go to Step 11.

Repair the wiring harness.

STEP 11. Connector check: D-420 ETACS-ECU connector

Q. Is the check result normal?

Go to Step 12.

Repair the defective connector.

STEP 12. Check the wiring harness from D-420 ETACS-ECU connector terminal No.69 to E-125 rear foot lamp connector terminal No.2.

note

Prior to the wiring harness inspection, check intermediate connector D-219 and joint connector D-34, and repair if necessary.

Check the earth wires for open circuit.

Q. Is the check result normal?

Replace the rear foot lamp.

Repair the wiring harness.

STEP 13. Connector check: D-420 ETACS-ECU connector, E-103 ceiling lamp connector

Q. Is the check result normal?

Go to Step 14.

Repair the defective connector.

STEP 14. Check the wiring harness from D-420 ETACS-ECU connector terminal No.71 to E-103 ceiling lamp connector terminal No.1.

note

Prior to the wiring harness inspection, check intermediate connector D-130, E-128, and repair if necessary.

Check the power supply line for open circuit.

Q. Is the check result normal?

Go to Step 15.

Repair the wiring harness.

STEP 15. Check the wiring harness from D-420 ETACS-ECU connector terminal No.69 to E-103 ceiling lamp connector terminal No.2.

note

Prior to the wiring harness inspection, check intermediate connector D-130, E-128, and repair if necessary.

Check the earth wires for open circuit.

Q. Is the check result normal?

Replace the ceiling lamp.

Repair the wiring harness.