#
PANEL LIGHT CONTROL SWITCH INSPECTION

BME091866600W02

1. Remove the panel light control switch. (See PANEL LIGHT CONTROL SWITCH REMOVAL/INSTALLATION.)

2. Connect the negative battery cable.

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

4. Measure the voltage at the panel light control switch as indicated below.

5. Disconnect the panel light control switch connector before inspecting for continuity at terminal D.

  • If not as specified, inspect the parts listed under "Action."
  • If the parts and wiring harnesses are okay but the system still does not work properly, replace the panel light control switch.

## Terminal Voltage Table (Reference)

Terminal | Signal | Connected to | Test condition | Voltage (V)/Continuity | Action
--- | --- | --- | --- | --- | ---
B | TNS | TNS relay | Headlight switch at TNS or headlight position | B+ | • Inspect TNS relay (See RELAY INSPECTION.) • Inspect TAIL 15A fuse • Inspect related harness
Other | 0
C | Illumination | Each illumination | Inspect using an oscilloscope (See Terminal C inspection.) | - | • Inspect each illumination • Inspect related harness
D | Ground | GND | Under any condition: inspect for continuity to ground | Yes | • Inspect GND • Inspect related harness

### Terminal C inspection

1. Measure the wave pattern of the terminal C 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.