[54D] SMART WIRING SYSTEM (SWS) NOT USING SWS MONITOR <Except for Hong Kong spec.> - - SYMPTOM PROCEDURES - HEADLAMP AND TAIL LAMP - INSPECTION PROCEDURE L-2: The low-beam headlamps do not illuminate normally. | PRINT PAGE / INDEX / PRIOR / NEXT

INSPECTION PROCEDURE L-2: 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. MUT-II/III diagnosis code When the ignition switch is turned to the LOCK (OFF) position, check that the ETACS-ECU does not set the diagnosis code. Q: Is the diagnosis code set? YES: Refer to diagnosis code chart . NO: Go to Step 2.
| Step 2. Pulse check Check the input signals below, which are related to the low-beam headlamps.
System switch | Check condition
--- | ---
Ignition switch (IG1) | When turned from ACC to ON
Headlamp switch | When the lighting switch is turned to the HEADLAMP position
OK: The MUT-II/III sounds or the voltmeter needle fluctuates. Q: Is the check result normal? All the signals are received normally.: Go to Step 3. The ignition switch (IG1) signal is not received.: Refer to Inspection Procedure P-2 "The ignition switch (IG1) signal is not received ." The headlamp switch signal is not received.: Refer to Inspection Procedure P-5 "The column switch (lighting and turn-signal lamp switch) signal is not received ."
| 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: Is the check result 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.

[54D] SMART WIRING SYSTEM (SWS) NOT USING SWS MONITOR <Except for Hong Kong spec.> - - SYMPTOM PROCEDURES - HEADLAMP AND TAIL LAMP - INSPECTION PROCEDURE L-2: The low-beam headlamps do not illuminate normally. | PRINT PAGE / INDEX / PRIOR / NEXT

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