ILL.1" through "ILL.6" displayed in the odometer field indicate the level of the dash light dimmer setting. These messages will be displayed briefly when the dash light dimmer setting is adjusted. In the '05 Subaru Outbacks, dash light dimmers are known to fail. When they fail, the "ILL.n" message will appear sporadically in the odometer display without changing the dimmer setting. Replacing the dimmer will correct the problem.
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