INSPECTION PROCEDURE K-6: The headlamp automatic shutdown 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

Headlamp switch

If this function does not work normally, these input signal circuit(s), the front-ECU or the ETACS-ECU may be defective. Note that this function can be disabled/enabled by the customize function (default setting; enabled (D)).

POSSIBLE CAUSES

Malfunction of the driver's door switch

Malfunction of the front-ECU

Malfunction of the column switch

Malfunction of the ETACS-ECU

Damaged harness wires and connectors

DIAGNOSIS PROCEDURE

Step 1. Check the SWS monitor customized function.

Use the SWS monitor customize function to confirm that "H/L AUTO-CUT" is set to "W.FUNCTION(A)" or "W.FUNCTION(D)".

Q: Is the check result normal?

YES: Go to Step 2

.
NO: Use the SWS monitor customize function to set "H/L AUTO-CUT" to "W.FUNCTION(A)" or "W.FUNCTION(D)" (Refer to

Step 2. ECU check on the SWS monitor

Check that the power supply and earth lines to the column switch (column-ECU), the ETACS-ECU and the front-ECU and the SWS communication lines are normal.

Ignition switch: OFF

ECUS TO BE CHECKED

COLUMN ECU

ETACS ECU

FRONT ECU

OK: "OK" are displayed for all the items

Q: Are the check result normal?

"OK" are displayed for all the items: Go to Step 3

.
"NG" is displayed on the "COLUMN ECU" menu.: Refer to Inspection Procedure A-2 "Communication with the column switch (column-ECU) is not possible"

.
"NG" is displayed on the "ETACS ECU" menu.: Refer to Inspection Procedure A-3 "Communication with the ETACS-ECU is not possible"

.
"NG" is displayed on the "FRONT ECU" menu.: Refer to Inspection Procedure A-4 "Communication with the front-ECU is not possible"

Step 3. Function diagnosis by using the SWS monitor

Check the SWS communication signal, which are related to the headlamp automatic shutdown function.

<Selected item> LIGHTING - HD AUTO-CUT

Ignition switch: from ON to OFF

Lighting switch: "TAIL" or "HEAD"

Item No.	Item name	Normal conditions
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)	from ON to OFF

Driver's door: open

Item No.	Item name	Normal conditions
Item 32	DR DOOR SW	ON
Item 35	HD AUTO-CUT	ON

OK: Normal conditions displayed for all the items

Q: Are the check result normal?

Normal conditions displayed for all the items: Go to Step 4

.
Normal condition is not displayed for item 00 or 01.: Refer to inspection procedure P-5 "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-4 "The driver's door switch signal is not received"

.
Normal condition is not displayed for item No.35.: Replace the front-ECU.

Step 4. Retest the system.

Check that the headlamp automatic shutdown function works normally.

Q: Is the check result normal?

YES: The trouble can be an intermittent malfunction (Refer to GROUP 00 - How to Cope with Intermittent Malfunction

).
NO: Replace the ETACS-ECU.