Inspection Procedure B-4

INSPECTION PROCEDURE B-4: Tone Alarm: Door ajar Warning Buzzer 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

Door Ajar Tone Alarm Function Circuit:

CIRCUIT OPERATION
The ETACS-ECU controls the door-ajar warning tone alarm, based on the signals from the switches and sensors below.
- Ignition switch (IG1): ON
- One of the door switches: ON
- Vehicle speed signal: 8 km/h (5 mph) or more

TECHNICAL DESCRIPTION (COMMENT)
If the door-ajar warning tone alarm does not work, connector(s), wiring harness in the CAN bus lines, the combination meter, the ETACS-ECU or the input signal circuit may be defective.

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 combination meter may be defective
- 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 adjustment function.

Q: Has the door-ajar warning tone alarm function been enabled by the adjustment function?

YES : Go to Step 2.

NO : Enable the door-ajar warning tone alarm.

STEP 2. Using scan tool MB991958, diagnose the CAN bus line.

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.







1. Connect scan tool MB991958. Refer to "How to connect SWS monitor." How to Connect SWS Monitor
2. Turn the ignition switch to the "ON" position.
3. Diagnose the CAN bus line.
4. Turn the ignition switch to the "LOCK" (OFF) position.

Q: Is the CAN bus line found to be normal?

YES : Go to Step 3.

NO : Repair the CAN bus line.

STEP 3. Using scan tool MB991958, read the combination meter diagnostic trouble code.







Check whether the combination meter-related DTC is set.

1. Turn the ignition switch to the "ON" position.
2. Check whether the combination meter-related DTC is set.
3. Turn the ignition switch to the "LOCK" (OFF) position.

Q: Is the DTC set?

YES : Diagnose the combination meter. Refer to Diagnosis. Diagnostic Trouble Code Descriptions

NO : Go to Step 4.

STEP 4. Use scan tool MB991958 to select "ECU COMM Check" on the SWS monitor display. Check the ETACS-ECU.

CAUTION: 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 SWS monitor. Refer to "How to connect SWS monitor." How to Connect SWS Monitor
2. Turn the ignition switch to the "ON" 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 Step 5.

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

STEP 5. Check the input signal by using "FUNCTION DIAG." menu of the SWS monitor.







Check the input signals from the following switches:
- Ignition switch: ON
- Driver's door: Open
- Vehicle speed: 8 km/h (5 mph) or more

1. Operate scan tool MB991958 according to the procedure below to display "OTHER ALARM"
a. Select "Interactive Diagnosis."
b. Select "System Select."
c. Select "SWS."
d. Select "SWS MONITOR."
e. Select "Function Diag."
f. Select "BUZZER."
g. Select "OTHER ALARM"

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

NOTE: The scan tool MB991958 display changes when the driver's or the front passenger's door is opened. If any of the doors are open, the system cannot be checked correctly.







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

Normal conditions are displayed for all the items : Go to Step 6.

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 "DR DOOR SW": Refer to Inspection Procedure M-4 "ETACS-ECU does not receive any signal from the front door switches." Inspection Procedure M-4

Normal condition is not displayed for "BUZZER" : Replace the ETACS-ECU. When the ETACS-ECU is replaced, register the encrypted code. The door-ajar tone alarm function should now work normally.

STEP 6. Check the input signal (by using the pulse check mode of the monitor).







Check the following switches and input signals:

- Doors switches

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 is operated, does scan tool MB991958 sound?

YES : Replace the ETACS-ECU. When the ETACS-ECU is replaced, register the encrypted code. The door ajar warning buzzer function should now work normally.

NO : Refer to Inspection Procedure N-3 "ETACS-ECU does not receive any signal from any of the door switches." Inspection Procedure N-3