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Home >> Isuzu >> 2007 >> Ascender 4WD >> Repair and Diagnosis >> External Pages >> Different car >> Section 263 (Cellular System, Entertainment System, And Navigation System) >> Diagnostic Information & Procedures >> DTC B0004 >> Circuit/System Testing

Circuit/System Testing

WARNING: This page is about a different car, the 2008 Isuzu Ascender, 2008 GMC Envoy, and 2008 Chevrolet TrailBlazer. However, it is still accessible from the selected car via links, so may be relevant.
  1. Ignition OFF, disconnect the harness connector X2 at the radio. Disconnect the harness connector X1 at the instrument panel cluster.
  2. Test for less than 5 ohms on the vehicle speed signal between the radio harness connector X2 terminal E and the IPC connector X1 terminal 21.
    • If less than the specified range, repair the open/high resistance. If the circuit tests normal, replace the radio.
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