Tests AD: Message Center Not Operating Correctly - DTE Displays CO

AD1:

Normal Conditions
Battery voltage is applied to the message center processor in the OFF position via circuit 729 (RD/WH) and switched power is applied through circuit 1003 (GY/YE). The message center processor grounding is accomplished via circuit 875 (BK/LB). DTE display CO indicates an open in circuit 29 (YE/WH) or a fuel indication failure.

Possible Causes
^ circuit 29 (YE/WH) open
^ fuel level sensor and pump
^ instrument cluster