[54C] SMART WIRING SYSTEM (SWS) USING SWS MONITOR <Hong Kong spec.> - - SYMPTOM PROCEDURES - HEADLAMP AND TAIL LAMP - INSPECTION PROCEDURE K-3: The low-beam headlamps do not illuminate normally. | PRINT PAGE / INDEX / PRIOR / NEXT

INSPECTION PROCEDURE K-3: The low-beam headlamps do not illuminate normally.
| CAUTION Whenever the ECU is replaced, ensure that the input and output signal circuits are normal.
| COMMENTS ON TROUBLE SYMPTOM If the low-beam headlamps do not illuminate, the headlamp switch input circuit or the front-ECU may be defective.
| POSSIBLE CAUSES Malfunction of the column switch Malfunction of the front-ECU Damaged harness wires and connectors
| DIAGNOSIS PROCEDURE
| Step 1. ECU check on the SWS monitor Check that the power supply and earth lines to the column switch (column-ECU) and the front-ECU and the SWS communication lines are normal. Ignition switch: OFF ECUS TO BE CHECKED COLUMN 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 2. "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 "FRONT ECU" menu.: Refer to Inspection Procedure A-4 "Communication with the front-ECU is not possible" .
| Step 2. Function diagnosis by using the SWS monitor Check the SWS communication signal, which are related to the low-beam headlamps. <Selected item> LIGHTING - HEADLAMP LO Ignition switch: ON Lighting switch: HEAD
Item No. | Item name | Normal conditions
--- | --- | ---
Item 00 | HEADLAMP SW | ON
Item 03 | PASSING SW | OFF
Item 30 | IG SW(IG1) | ON
Item 35 | HD AUTO-CUT | OFF
OK: Normal conditions 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.03: 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.35.: Refer to Inspection Procedure K-6 "The headlamp automatic shutdown function does not work normally" .
| Step 3. Connector check: A-11X front-ECU connector Q: Is the check result normal? YES: Go to Step 4. NO: Repair the defective connector.
| Step 4. Measure the voltage at A-11X front-ECU connector. Remove the front-ECU, and measure at the relay box side. Voltage between A-11X front-ECU connector terminal Nos. 8, 9 and body earth OK: Battery positive voltage Q: Are the check results normal? YES: Go to Step 6. NO: Go to Step 5.
| Step 5. Check the wiring harness between A-11X front-ECU connector terminal Nos. 8, 9 and the battery. Check the power supply line for open circuit. 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: Repair the wiring harness.
| Step 6. Retest the system. Check that the low-beam headlamps illuminate 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 front-ECU.

[54C] SMART WIRING SYSTEM (SWS) USING SWS MONITOR <Hong Kong spec.> - - SYMPTOM PROCEDURES - HEADLAMP AND TAIL LAMP - INSPECTION PROCEDURE K-3: The low-beam headlamps do not illuminate normally. | PRINT PAGE / INDEX / PRIOR / NEXT

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