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Inspection procedure B-1: Light reminder tone alarm does not work normally.
 
 
cautionWhenever the ECU is replaced, ensure that the power supply circuit, the ground circuit and the communication circuit are normal.
 
 
TECHNICAL DESCRIPTION (COMMENT)
The ETACS-ECU uses the input signals below to send a light reminder tone alarm request signal to the combination meter.
  • Ignition switch (IG1)
  • Driver's door switch
  • Taillight switch
  • Headlight switch
If the tone alarm does not sound properly, the input signal(s) are abnormal or the combination meter or the ETACS-ECU may be defective.
 
 
TROUBLESHOOTING HINTS
  • The driver's door switch may be defective.
  • The column switch may be defective.
  • The combination meter may be defective.
  • The ETACS-ECU may be defective.
 
 
DIAGNOSIS
STEP 1. Using scan tool (M.U.T.-III), read the diagnostic trouble code.
(1)
cautionTo prevent damage to scan tool (M.U.T.-III), always turn the ignition switch to the "LOCK" (OFF) position before connecting or disconnecting scan tool (M.U.T.-III).
Connect scan tool (M.U.T.-III). Refer to "How to connect the scan tool (M.U.T.-III) ."
(2) Turn the ignition switch to the "ON" position.
(3) Check whether the ETACS-ECU related DTC is stored.
(4) Turn the ignition switch to the "LOCK" (OFF) position.
Is the DTC stored?
Refer to DTC chart .
Go to Step 2.
 
STEP 2. Using scan tool (M.U.T.-III), check data list.
Check the input signals below, which are related to the light reminder tone alarm function.
  • Turn the ignition switch to the "LOCK" (OFF) position.
  • Open the driver’s door.
  • Column switch (lighting switch): TAIL or HEAD
 
Item No.Item nameNormal condition
19Driver's door switchON
30Ignition switch(IG1)OFF
60Headlight outputAny of items is ON
59Taillight output
OK: Normal conditions are displayed for all the items.
Is the check result normal?
Go to Step 3.
Troubleshoot the ETACS-ECU. Refer to ETACS, Diagnosis .
 
STEP 3. Check by scan tool (M.U.T.-III) "Special Function."
Using scan tool (M.U.T.-III), select "Test" from the special function of the combination meter. Execute the following item to check the tone alarm.
  • Item 3: Buzzer(AUTO)
Is the check result normal?
Go to Step 4.
Replace the combination meter.
 
STEP 4. Retest the system.
Check that the light reminder tone alarm works normally.
Is the check result normal?
The trouble can be an intermittent malfunction (Refer to GROUP 00 - How to use Troubleshooting/Inspection Service Points - How to Cope with Intermittent Malfunction ).
Replace the ETACS-ECU.