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Home >> Hummer >> 2008 >> H2 4D Utility Wagon >> Repair and Diagnosis >> External Pages >> Different car >> Section 450 (Mirror System) >> Diagnostic Information and Procedures >> DTC B1580 or B1590 >> Circuit/System Verification

Circuit/System Verification

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Ignition ON, observe the scan tool Mirror Horizontal Position and Mirror Vertical Position parameters. The reading should be between 0.2-4.8 volts and change as the mirror is moved, left, right, up, and down.

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