MX-5 Miata Mazdaspeed L4-1.8L DOHC Turbo (2004)
Dimmer Switch: Testing and Inspection
PANEL LIGHT CONTROL SWITCH INSPECTION
1. Remove the panel light control switch without disconnecting the connector. (See PANEL LIGHT CONTROL SWITCH
REMOVAL/INSTALLATION.)
2. Measure the voltage at the panel light control switch terminals as indicated below.
Terminal Voltage List (Reference)
3. Disconnect the panel light control switch connector and inspect for continuity at terminal G.
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If not as specified, inspect the parts listed under "Action."
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If the parts and wiring harnesses are okay but the system still does not work properly, replace the panel light control switch.
A terminal inspection
1. Measure the wave pattern of the A terminal on the panel light control switch using an oscilloscope.
2. Set the headlight switch to either the first or second position.
3. Set the panel light control switch to the brightest position.