INSPECTION PROCEDURE B-1: Lamp reminder 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)
  • Driver’s door switch
  • Tail lamp switch
If this function does not work normally, these input signal circuit(s) or the ETACS-ECU may be defective.

POSSIBLE CAUSES

  • Malfunction of the driver’s door switch
  • Malfunction of the column switch
  • Malfunction of the ETACS-ECU
  • Damaged harness wires and connectors

DIAGNOSIS PROCEDURE

Step 1. ECU check by using the SWS monitor
Check that the power supply and earth lines to the ETACS-ECU and the column switch (column-ECU) and the SWS communication lines are normal.

  • Ignition switch: OFF
ECUS TO BE CHECKED
  • ETACS ECU
  • COLUMN ECU
OK: "OK" are displayed for all the items

Q. Are the check result normal?
"OK" is displayed for all the items : Go to Step 2.
"NG" is displayed on the "ETACS ECU" menu. : Refer to Inspection Procedure A-3 "Communication with ETACS-ECU is not possible ."
"NG" is displayed on the "COLUMN ECU" menu. : Refer to Inspection Procedure A-2 "Communication with column switch (column-ECU) is not possible ."

Step 2. Function diagnosis by using the SWS monitor
Check the SWS communication signal, which are related to the lamp reminder function.
<Selected item> BUZZER - LGT MONI. ALRM
  • Ignition switch: OFF (key removed)
  • lighting switch: HEAD
  • Driver’s door: open
Item No.
 Item name
 Normal condition
Item 00
 HEADLAMP SW
 ON when the lighting switch is at HEAD
Item 01
 TAIL LAMP SW
 ON when the lighting switch is at TAIL
Item 30
 IG SW(IG1)
 OFF
Item 32
 DR DOOR SW
 ON
Item 43
 BUZZER
 ON
OK: Normal conditions are displayed for all the items.

Q. Are the check result normal?
Normal conditions are displayed for all the items : Go to Step 3.
Normal condition is not displayed for item No.00 or No.01 : Refer to inspection procedure P-6 "The column switch (lighting and turn-signal lamp switch) signal is not received ."
Normal condition is not displayed for item No.30 : Refer to inspection procedure P-2 "The ignition switch (IG1) signal is not received ."
Normal condition is not displayed for item No.32 : Refer to inspection procedure P-5 "The driver’s door switch signal is not received <LH drive vehicles> or <RH drive vehicles>."
Normal condition is not displayed for item No.43 : Replace the ETACS-ECU.

Step 3. Retest the system.
The lamp reminder buzzer function should work 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.