INSPECTION PROCEDURE B-3: Door-ajar warning buzzer function does not work normally.


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


COMMENTS ON TROUBLE SYMPTOM
The ETACS-ECU operates this function in accordance with the input signals below.

  • Ignition switch (IG1)
  • Door switches
  • Tailgate switch
  • Vehicle speed signal
If this function does not work normally, these input signal circuit(s) or the ETACS-ECU may be defective. Note that this function can be disabled/enabled by the customize function (default setting; enabled). In order to change the setting, the SWS monitor is required.

POSSIBLE CAUSES

  • Malfunction of the door switches
  • Malfunction of the tailgate switch
  • Malfunction of the ETACS-ECU
  • Damaged harness wires and connectors

DIAGNOSTIC PROCEDURE

Step 1. Check the power supply circuit.
When the ignition switch is turned to the LOCK (OFF) position, check if the hazard warning lamps illuminate.

Q. Is the check result normal?
Go to Step 2.
Refer to inspection procedure A-2 "Check the ETACS-ECU battery power supply circuit ."

Step 2. Pulse check
Check the input signals below, which are related to the door-ajar warning buzzer function.
System switch
 Check conditions
Ignition switch (IG1)
 When turned from ACC to ON
Driver’s door switch
 Driver’s door opened
Passenger’s door switch
 Passenger’s door opened
Rear door (RH) switch
 Rear door (RH) opened
Rear door (LH) switch
 Rear door (LH) opened
Tailgate switch
 A tailgate opened
Vehicle speed signal
 When the vehicle speed has reached 10 km/h or more
OK: The M.U.T.-III sounds or the voltmeter needle fluctuates.

Q. Are the check result normal?
All the signals are received normally. : Go to Step 3.
The ignition switch (IG1) signal is not received. : Refer to inspection procedure P-2 "The ignition switch (IG1) signal is not received" .
All the door switch signals are not received. : Refer to inspection procedure P-12 "All the door switch signals are not received ."
The vehicle speed signal is not received. : Refer to inspection procedure P-23 "The vehicle speed signal is not received" .

Step 3. Check the SWS monitor customized function.
Use the SWS monitor customize function to confirm that "DOOR WARN BUZ" is set to "W.FUNCTION".
caution The SWS monitor must be used in order to confirm and change that setting. Use the SWS monitor to confirm and/or change the customized function.

Q. Is the check result normal?
Go to Step 4.
Use the SWS monitor customize function to set "DOOR WARN BUZ" to "W.FUNCTION" (Refer to GROUP 54C - Customize adjustment ).

Step 4. Retest the system.
Check that the door-ajar warning buzzer function works normally.

Q. Is the check result normal?
The trouble can be an intermittent malfunction (Refer to GROUP 00 - How to Cope with Intermittent Malfunction ).
Replace the ETACS-ECU.