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Error Code 05 (Sunload Sensor)

WARNING: This page is about a different car, the 1992 Lincoln Continental. However, it is still accessible from the selected car via links, so may be relevant.
  1. Disconnect negative battery cable. Unplug wiring harness connectors at sunload sensor and control panel. Check wiring for continuity, shorts and opens. See WIRING DIAGRAMS  . Repair as necessary.
  2. Sensor is a photodiode and can be checked with an ohmmeter. With harness disconnected, there should be some resistance present across sensor terminals, depending on amount of light available. If resistance is 0 (zero), replace sensor.