Instrument Cluster Circuit Description. Chevrolet PJJ 2000

For 1990-2009 cars

### Power, Ground and Class 2

The instrument panel cluster (IPC) receives battery positive voltage from the instrument panel (IP) fuse block CLU BATT fuse, through CKT 1440 to terminal G. The IPC receives ignition voltage (ACCY and ON) from the IP fuse block BCM/CLU fuse, through CKT 39 to terminal J.

The IPC receives ground from CKT 150 to terminal A and from CKT 451 to terminal H.

The IPC receives all class 2 serial data messages on CKT 1807 at terminal L and terminal K.

### Indicators

The IPC uses the class 2 serial data to light the various indicators and control the gauges. The THEFT SYSTEM indicator and SERVICE ENGINE SOON indicators are the only discrete inputs to the IPC. CKT 728 from the body control module (BCM) to the IPC terminal E controls the THEFT SYSTEM indicator. CKT 419 from the powertrain control module (PCM) to the IPC terminal D controls the SERVICE ENGINE SOON indicator.

The left turn indicator is controlled through CKT 14 to terminal F of the IPC. The right turn indicator is controlled through CKT 15 to terminal C of the IPC.