C250 Standard Instrument Cluster Connector Pinout - Wire Colors & Functions

This document is a connector pinout reference for connector C250, the standard instrument cluster connector. It includes a diagram of the 18-pin connector face showing pin orientation (pins 1/18 at top, 9/10 at bottom) with circuit numbers and wire colors called out for each populated cavity. Below the diagram, a table lists all 18 pins with their circuit numbers, wire colors, and functions. Key circuits include: pin 2, circuit 29 (Y/W) Fuel Sender; pin 3, circuit 150 (DG/W) Vehicle Speed Sensor (VSS); pins 4, 17, and 18, grounds (57 BK, 57 BK, 359 GY/R); pins 5 and 10, circuit 19 (LB/R) Illumination; pin 6, circuit 2 (W/LB) Right Turn Indicator; pin 11, circuit 871 (Y) Passive Restraint Module; pin 12, circuit 31 (W/R) Oil Pressure Switch; pin 14, circuit 606 (W/LB) Anti-lock Brake Control Module; pin 15, circuit 627 (BK/O) Door Ajar Switches; and pin 16, circuit 640 (R/Y) Power. Pins 1, 7, 8, 9, and 13 are not used. This is useful for diagnosing gauge, illumination, VSS, or cluster power/ground issues on vehicles using this standard (non-electronic) cluster.