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Home >> Plymouth >> 1990 >> Horizon Automatic >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - Tests W/Codes - 2.2L >> Entering On-Board Diagnostics >> DRB-II Switch Test Mode
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DRB-II Switch Test Mode

The SBEC can only recognize high and low states on switch circuits. SBEC cannot tell the difference between an open or short circuit or a defective switch. The DRB-II display must change between INPUT HIGH and INPUT LOW.