Inspection Procedure B-2: 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)
  • All of the door switches
  • 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.

PROBABLE CAUSES

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

DIAGNOSIS PROCEDURE

STEP 1. M.U.T.-III CAN bus diagnostics
Use the M.U.T.-III to diagnose the CAN bus lines.

Q. Is the check result normal?
Go to Step 2.
Repair the CAN bus line (Refer to GROUP 54D - Troubleshooting ).

STEP 2. 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 3.
Refer to inspection procedure A-1 "Check the battery power supply circuit to the ETACS-ECU ."

STEP 3. 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 is opened while all the other doors are closed.
Passenger’s door switch
 Passenger’s door is opened while all the other doors are closed.
Rear door (RH) switch
 Rear door (RH) is opened while all the other doors are closed
Rear door (LH) switch
 Rear door (LH) door is opened while all the other doors are closed
Back door switch
 Back door is opened while all the other doors are closed
OK: The M.U.T.-III sounds or the voltmeter needle fluctuates.

Q. Are the check result normal?
YES <All the signals are received normally.> : Go to Step 4.
NO <The ignition switch (IG1) signal is not received.> : Refer to .
NO <All the door switch signals are not received.> : Refer to .

STEP 4. Check the combination meter.
Check that the speedometer works normally.

Q. Is the check result normal?
Go to Step 5.
Diagnose the combination meter.Refer to .

STEP 5. Customize function by using the SWS monitor.
Check that the door-ajar warning buzzer function has been enabled by using the customize 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 6.
Enable the keyless entry door-ajar warning buzzer function by using the adjustment function. (Refer to ).

STEP 6. 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 use troubleshooting/Inspection Service Points ).
Replace the ETACS-ECU.