PANEL LIGHT CONTROL SWITCH INSPECTION

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1. Connect the panel light control switch connector.

2. Connect the negative battery cable.

3. Measure the voltage at each terminal.

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

4. Disconnect the panel light control switch connector.

• 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)

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Terminal

Signal name

Connected to

Measured condition

Measured condition

Voltage (V)/Continuity

Inspection item(s)

A

Illumination

Instrument cluster

Inspect using an oscilloscope. (See Terminals A and F Inspection.)

–

•  Instrument cluster

•  Each illumination

•  Related wiring harnesses

F

Each illumination

B

TNS

TNS relay

Turn the light switch to the TNS or ON position.

B+

•  TNS relay
(See RELAY INSPECTION.)

•  ILLUMI 10 A fuse

•  Related wiring harnesses

Turn the light switch to the OFF position.

1.0 or less

D

GND

Body ground

Under any condition

1.0 or less

•  GND

•  Related wiring harnesses

G

IG1

Ignition switch

Turn the ignition switch to the ON position.

B+

•  Ignition switch
(See IGNITION SWITCH INSPECTION.)

•  Related wiring harnesses

Turn the ignition switch to the ACC or LOCK position.

1.0 or less

H

Dimmer cancel

Instrument cluster/center panel module

Turn the light switch to the TNS or ON position.

Dimmer cancel switch is on.

B+

•  Instrument cluster

•  Center panel module

•  Related wiring harnesses

Dimmer cancel switch is off.

1.0 or less

Terminal	Signal name	Connected to	Measured condition	Measured condition	Voltage (V)/Continuity	Inspection item(s)
A	Illumination	Instrument cluster	Inspect using an oscilloscope. (See Terminals A and F Inspection.)	–	• Instrument cluster • Each illumination • Related wiring harnesses
F	Each illumination
B	TNS	TNS relay	Turn the light switch to the TNS or ON position.	B+	• TNS relay (See RELAY INSPECTION.) • ILLUMI 10 A fuse • Related wiring harnesses
Turn the light switch to the OFF position.	1.0 or less
D	GND	Body ground	Under any condition	1.0 or less	• GND • Related wiring harnesses
G	IG1	Ignition switch	Turn the ignition switch to the ON position.	B+	• Ignition switch (See IGNITION SWITCH INSPECTION.) • Related wiring harnesses
Turn the ignition switch to the ACC or LOCK position.	1.0 or less
H	Dimmer cancel	Instrument cluster/center panel module	Turn the light switch to the TNS or ON position.	Dimmer cancel switch is on.	B+	• Instrument cluster • Center panel module • Related wiring harnesses
Dimmer cancel switch is off.	1.0 or less

Terminals A and F Inspection

1. Measure the wave pattern of panel light control switch terminals A and F using an oscilloscope.

• Oscilloscope setting :

5 V/DIV (Y) , 5 ms/div (X) , DC range

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2. Turn the light switch to the TNS or ON position.

3. Turn the panel light control switch to the brightest setting.

4. Verify that the wave pattern is as shown in the figure.

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5. Turn the panel light control switch to the darkest position and verify that the wave pattern is as shown in the figure.

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