PANEL LIGHT CONTROL SWITCH INSPECTION


BHE091866600W02

1. Connect the panel light control switch connector.

2. Connect the negative battery cable.

3. 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)".

4. Disconnect the panel light control switch connector.

5. 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 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
• 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: Inspect for continuity to ground.
Continuity detected
• GND
• Related wiring harnesses
G
IG1
Ignition switch
Turn the ignition switch to the ON position.
B+
• Ignition switch
• 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

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.

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