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Home >> Isuzu >> 2008 >> Ascender LS, RWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 203 (Mirror System) >> Diagnostic Information and Procedures >> DTC B1721 >> Circuit/System Testing

Circuit/System Testing

WARNING: This page is about a different car, the 2009 GMC Envoy and 2009 Chevrolet TrailBlazer. However, it is still accessible from the selected car via links, so may be relevant.
  1. Ignition OFF, disconnect the X5 harness connector at the DDM.
  2. Ignition ON, verify the scan tool Mirror Motor parameter is Idle.
    • If not the specified value, replace the DDM.
  3. Ignition OFF, connect the X5 harness connector at the DDM.
  4. Ignition ON, observe the scan tool Mirror Motor parameter while cycling the mirror directional switch between the up, down, left and right positions. The parameter should change between Idle, Up, Down, Left, and Right.
    • If the parameter does not cycle between the specified values, replace the outside rearview mirror switch.
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