Test G

PINPOINT TEST G: NO COMMUNICATION WITH THE INSTRUMENT CLUSTER

Test G1-G2:

Test G2 Continued:

Normal Operation
Under normal operation the instrument cluster communicates interactively with other electronic modules using the CAN circuits and the UART-based protocol (UBP) communication network. CAN communication is accomplished through the use of an unshielded, twisted pair cable data bus line, circuits 3125 (TN/YE) and 3126 (TN/YE). UBP communication is accomplished through a single data bus line, circuit 693 (OG). With the key in the START/RUN position, the instrument cluster receives power from the CJB fuse 21 (5A), circuit 489 (PK/BK). When in the RUN/ACC position, power is received from the CJB fuse 15 (5A), circuit 295 (LB/PK). With the ignition in the OFF position, the instrument cluster receives its keep-alive power from the battery junction box (BJB) fuse 49 (15A), circuit 3049 (BK/LG). The instrument cluster grounding is accomplished through circuit 1203 (BK/LB) and the bulb grounding is accomplished through circuit 1205 (BK).

Possible Causes
- circuit 295 (LB/PK) open or shorted to ground
- circuit 489 (PK/BK) open or shorted to ground
- circuit 1203 (BK/LB) open or shorted to power
- circuit 1205 (BK) open or shorted to power
- circuit 3049 (BK/LG) open or shorted to ground
- instrument cluster