PANEL LIGHT CONTROL SWITCH INSPECTION

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1. Measure the voltage at each terminal (other than terminal D).

• If the voltage is not as specified in the Terminal Voltage Table (Reference), inspect the parts under "Inspection item(s)".

2. Disconnect the panel light control switch connector.

3. Verify that continuity at terminal D is as indicated in the Terminal Voltage Table (Reference).

• If there is any malfunction, inspect the parts under "Inspection item(s)".
- 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)

Terminal

Signal

Connected to

Test condition

Voltage (V)/Continuity

Inspection item(s)

D
Illumination
Each illumination
Inspect using an oscilloscope.
-
• Each illumination
• Related harness
F
TNS
TNS relay
Headlight switch is at TNS or headlight position.
B+
• TNS relay (See RELAY INSPECTION.)
• ILLUMI 10A fuse
• Related harness
Other
0
H
Ground
GND
Under any condition: Inspect for continuity to ground.
Yes
• GND
• Related harness

Terminal D inspection

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

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.

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.