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SWS - Troubleshooting 54B-21 Inspection Procedure F-3 The headlamps (low-beam) do not light. Probable cause If the (low-beam) headlamp on neither side lights up, either the headlamp switch input circuit system or the front-ECU may be defective. D Column switch fault D front-ECU fault D Harness or connector fault NO Check the MUT-II input signals. Headlamp switch NG Check the headlamp switch input circuit system (Refer to P.54B-31, Inspection Procedure J-7). NG Repair NG Check the harness between the front-ECU and the battery, and repair if necessary. OK Replace front-ECU. OK Check the trouble symptoms. OK Measure at the front-ECU connector A-10X. Disconnect the connector and test on the relay box side. D Voltage between terminal 3 and the body earth. OK : System voltage NG Check the following connector: A-10X MUT-II diagnosis code When the ignition switch is in the LOCK (OFF) position, is the diagnosis code output? YES Diagnosis Code Chart (Refer to P.54B-3). NOTES: 1. If only one of the headlamps fails to light up, check the headlamp bulb and the harness between the front-ECU and the headlamps, and between the headlamps and body earth. 2. When failure is detected on the harness from the front-ECU to the battery, check and repair the front-ECU No. 4 terminal (A-10X) as well. Inspection Procedure F-4 The headlamps (high-beam) do not light. Probable cause If the (high-beam) headlamp on neither side lights up, either the dimmer switch input circuit system or the front-ECU may be defective. D Column switch fault D front-ECU fault D Harness or connector fault NG Check the harness between the front-ECU and the battery, and repair if necessary. OK Check the trouble symptoms. NG Repair OK Measure at the front-ECU connector A-10X. Disconnect the connector and test on the relay box side. D Voltage between terminal 4 and the body earth. OK : System voltage NG Check the following connector: A-10X YES Check the MUT-II input signals. Dimmer switch NG Check the dimmer switch input circuit system (Refer to P.54B-31, Inspection Procedure J-7). OK Replace front-ECU. Are the headlamps (low-beam) operating normally? NO Check the headlamps (low-beam) (Refer to P.54B-21, Inspection Procedure F-3). NOTE 1. If only one of the headlamps fails to light up, check the headlamp bulb and the harness between the front-ECU and the headlamps, and between the headlamps and body earth. 2. When failure is detected on the harness from the front-ECU to the battery, check and repair the front-ECU No. 3 terminal (A-10X) as well. |