Diagnostic procedure

WARNING: This page is about a different car, the 2001 Saab 9-3. However, it is still accessible from the selected car via links, so may be relevant.

The diagnostic trouble code is generated if there is an internal malfunction in the relay or if ground is missing on pin 5 in the relay base.

Check ground for pin 5 in relay base.
Try moving the relay to the position for the left rear window.
Activate the relay with the button for left front window on the center console.
Left rear window should raise or lower.
If the left rear window raises or lowers, the problem is most likely in the wiring harness