PANEL LIGHT CONTROL SWITCH INSPECTION

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1.  Connect the connector to the panel light control switch.

2.  Connect the negative battery cable.

3.  Measure the voltage at the panel light control switch using a tester.

•  When inspecting terminal B for continuity, disconnect the panel light control switch connector.

4.  If the value are not as specified in the Terminal Voltage List (Reference), inspect the parts under “Inspection item(s)” and related wiring harnesses.

5.  If the system does not work properly even though the parts or related wiring harnesses do not have any malfunction, replace the panel light control switch.

Terminal Voltage Table (Reference)

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Terminal	Signal	Connected to	Test condition		Voltage (V)/Continuity	Inspection item(s)
B	TNS	TNS relay	Headlight switch at TNS or headlight position		B+	•  TAIL 10A fuse •  Related wiring harness
			Other		1.0 or less
F	Ground	GND	Under any condition: inspect for continuity to ground		Continuity detected	•  GND •  Related wiring harness
D	Illumination	Each illumination	Inspect using an oscilloscope (See Terminal D inspection.)		—	•  Each illumination •  Related wiring harness

Terminal D inspection

1.  Measure the wave pattern of the terminal D on the panel light control switch using an oscilloscope.

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2.  Set the headlight switch to either the TNS or headlight position.

3.  Set the panel light control switch to the brightest position.

4.  Verify that the pattern on the screen is as shown in the figure.

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5.  Verify that the pattern on the screen matches the pattern shown in the figure as the panel light control switch is gradually turned to the darkest position.

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