Inspection Procedure K-5

INSPECTION PROCEDURE K-5: Interior Light: The interior light automatic shutoff function does not work normally.

NOTE: This troubleshooting procedure requires the use of scan tool MB991958 and SWS monitor kit MB991813. For details on how to use the SWS monitor, refer to "How to use SWS monitor." How to Use SWS Monitor

Interior Light Automatic Shutoff Function Circuit:

CIRCUIT OPERATION
The ETACS-ECU operates the interior light automatic shutdown function according to the following switch signals:
- Ignition switch (ACC)
- Ignition switch (IG1)
- Front door switch (LH)
- Door switches
- interior light loaded signal

TECHNICAL DESCRIPTION (COMMENT)
If the function does not work normally, the input circuit system from the switches or the ETACS-ECU may be defective (refer to "CIRCUIT OPERATION").

TROUBLESHOOTING HINTS
- Trouble in input signal system
- The wiring harness or connectors may have loose, corroded, or damaged terminals, or terminals pushed back in the connector
- The ETACS-ECU may be defective

DIAGNOSIS

Required Special Tools:
- MB991223: Harness Set
- MB992006: Extra Fine Probe
- MB991958: Scan Tool (M.U.T.-III Sub Assembly)
- MB991824: V.C.I.
- MB991827: M.U.T.-III USB Cable
- MB991910: M.U.T.-III Main Harness A

- MB991813: SWS Monitor Kit
- MB991806: SWS Monitor Cartridge
- MB991812: SWS Monitor Harness (For Column-ECU)
- MB991822: Probe Harness

STEP 1. Check the interior lights.

If the interior light switch is moved to the "door interlock position", the interior lights should illuminate when either door is opened.

Q: Do the interior light illuminate normally?

All the interior lights illuminate normally. : Go to Step 2.
None of the interior lights illuminate normally. : Refer to Inspection Procedure K-1 "The dome light do not illuminate and go out normally." Inspection Procedure K-1
Some of the interior lights do not illuminate normally. : Refer to Inspection Procedure K-2 "The front dome light, rear dome light or trunk light do not illuminate or go out normally." Inspection Procedure K-2

STEP 2. Check the adjustment function.

Q: Has a setting other than "No auto-shutoff" been selected for the interior light automatic shutdown function by the adjustment function?

YES : Go to Step 3.

NO : Set the interior light automatic shutdown function to another setting other than "No auto-shutoff".

STEP 3. Use scan tool MB991958 to select "ECU COMM Check" on the SWS monitor display.

Check the ETACS-ECU.

CAUTION: To prevent damage to scan tool MB991958, always turn the ignition switch to the "LOCK" (OFF) position before connecting or disconnecting scan tool MB991958. Connect special tool MB991910 before connecting special tool MB991812. Be sure to connect special tool MB991806 after turning on special tool MB991824.







1. Connect the special tool. Refer to "How to connect SWS monitor." How to Connect SWS Monitor
2. Turn the ignition switch to the "LOCK" (OFF) position.
3. Operate scan tool MB991958 according to the procedure below to display "ECU COMM Check."
a. Select "Interactive Diagnosis."
b. Select "System select."
c. Select "SWS."
d. Select "SWS MONITOR."
e. Select "ECU COMM Check."

4. Scan tool MB991958 should show "OK" on the "ECU COMM Check" menu for the "ETACS ECU" menu.

Q: Is "OK" displayed for the "ETACS ECU" menu?

YES : Go to Step4.

NO : Refer to Inspection Procedure A-3 "Communication with the ETACS-ECU is not possible." Inspection Procedure A-3

STEP 4. Check the input signal by using "DATA LIST" menu of the SWS monitor.







Check the input signals from the following switches:
- Ignition switch: OFF
- Driver's or front passenger's door: open

1. Operate scan tool MB991958 according to the procedure below to display "ETACS ECU."
a. Select "Interactive Diagnosis."
b. Select "System select."
c. Select "SWS."
d. Select "SWS MONITOR."
e. Select "Data List."
f. Select "ETACS ECU."

2. Check that normal conditions are displayed for the items described in the table below.







Q: Does the scan tool MB991958 display the items "IG SW (IG1)", "IG SW (ACC)" and "FRONT DOOR SW" as normal condition?

Normal conditions are displayed for all the items : Go to Step 5.

Normal condition is not displayed for "IG SW (IG1)" : Refer to Inspection Procedure M-2 "ETACS-ECU does not receive any signal from the ignition switch (IG1)." Inspection Procedure M-2

Normal condition is not displayed for "IG SW (ACC)" : Refer to Inspection Procedure M-1 "ETACS-ECU does not receive any signal from the ignition switch (ACC)." Inspection Procedure M-1

Normal condition is not displayed for "FRONT DOOR SW" : Refer to Inspection Procedure M-4 "ETACS-ECU does not receive any signal from the front door switches." Inspection Procedure M-4

STEP 5. Check the input signal (by using the pulse check mode of the monitor).







Check the following switches and input signals:
- Door switches
- Interior light loaded signal

1. Operate scan tool MB991958 according to the procedure below to display "Pulse check."
a. Select "Interactive Diagnosis."
b. Select "System select."
c. Select "SWS."
d. Select "Pulse Checking."

2. Check if scan tool MB991958 sounds or not.







Q: When any door switch, interior light, the liftgate latch or glass hatch latch is operated, does scan tool MB991958 sound?

Buzzer of scan tool MB991958 sounds normally. : Replace the ETACS-ECU. When the ETACS-ECU is replaced, register the encrypted code. Verify that the dome light illuminates normally.

When one of the doors is opened and closed, scan tool MB991958 does not sound : Refer to Inspection Procedure N-3 "ETACS-ECU does not receive any signal from any of the door switches." Inspection Procedure N-3

When one of the interior lights is illuminated, scan tool MB991958 does not sound : Refer to Inspection Procedure N-8 "ETACS-ECU does not receive any interior light loaded signal." Inspection Procedure N-8