[54C] SMART WIRING SYSTEM (SWS) USING SWS MONITOR <Hong Kong spec.> - - SYMPTOM PROCEDURES - HEADLAMP AND TAIL LAMP - INSPECTION PROCEDURE K-7: The auto lamp function does not work normally. | PRINT PAGE / INDEX / PRIOR / NEXT

INSPECTION PROCEDURE K-7: The auto lamp 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 If auto lamp function does not work normally, the above input signal circuit(s) or the ETACS-ECU may be defective.
| POSSIBLE CAUSES Malfunction of the ETACS-ECU Malfunction of the front-ECU Damaged harness wires and connectors
| DIAGNOSIS PROCEDURE
| Step 1. Check that the taillights and headlamps operate. Check that the tail lights and headlamps illuminate normally. Q: Is the check result normal? YES: Go to Step 2. NO: Check the taillights and the headlamps (Refer to trouble symptom chart ).
| Step 2. SWS monitor data list. Check the ETACS-ECU signals, which are related to the auto lamp function. <Selected item> ETACS ECU Ignition switch: ON
Item No. | Item name | Normal conditions
--- | --- | ---
Item 30 | IG SW(IG1) | ON
OK: Normal condition is displayed. Q: Is the check result normal? YES: Go to Step 3. NO: Refer to inspection procedure P-2 "The ignition switch (IG1) signal is not received ."
| Step 3. ETACS ANALOG data by using the SWS monitor. Check the ETACS-ECU signals, which are related to the auto lamp function. Vary the light intensity to the photo sensor.
Item No. | Item name | Normal conditions
--- | --- | ---
Item 01 | Photo sensor voltage | The voltage changes within a range of 0.68 to 3.8 V.
OK: Normal condition is displayed. Q: Is the check result normal? YES: Go to Step 4. NO: Refer to Inspection Procedure P-21 "No photo sensor signal is received ."
| Step 4. ETACS ANALOG data by using the SWS monitor. Check the ETACS-ECU input signals, which are related to the auto lamp function. Set the simulated vehicle speed at approximately 10km/h.
Item No. | Item name | Normal condition
--- | --- | ---
Item 03 | SPEED SENSOR | 8 to 10 km/h
OK: Normal condition is displayed. Q: Is the check result normal? YES: Go to Step 5. NO: Refer to inspection procedure P-15 "The vehicle speed signal is not received ."
| Step 5. Retest the system. Check that the auto lamp 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.

[54C] SMART WIRING SYSTEM (SWS) USING SWS MONITOR <Hong Kong spec.> - - SYMPTOM PROCEDURES - HEADLAMP AND TAIL LAMP - INSPECTION PROCEDURE K-7: The auto lamp function does not work normally. | PRINT PAGE / INDEX / PRIOR / NEXT

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