DTC U1096: Lost Communications With IPC
- Perform VEHICLE ON-BOARD DIAGNOSTIC SYSTEM CHECK under SELF-DIAGNOSTIC SYSTEM. If vehicle on-board diagnostic system check has been performed, go to next step.
- Turn ignition on. Using scan tool, observe scan tool display for DTC U1096. If scan tool displays LAST TEST FAILED for DTC U1096, go to next step. If scan tool does not display LAST TEST FAILED for DTC U1096, problem is intermittent. Turn ignition on. Using scan tool, select DIAGNOSTIC CIRCUIT CHECK- - -CLASS 2 MESSAGE MONITOR and monitor IPC. If INACTIVE is displayed, IPC is not communicating on class-2 serial data link.
- Turn ignition off. Disconnect IPC. Connect test light between ground and Gray 16-pin IPC connector terminal B2 (Orange wire), and terminal A1 (Pink wire). See Fig 1. If test light illuminates, go to next step. If test light does not illuminate, repair open in Orange or Pink wire between Gray 16-pin IPC connector and BCM/CLUSTER fuse (15-amp), or IGN 1 fuse (10-amp), located in underhood fuse block. See WIRING DIAGRAMS in appropriate ANALOG INSTRUMENT PANELS article.
- Connect test light between battery voltage and Gray 16-pin IPC connector terminals A6 and B4 (Black wires). If test light illuminates, go to next step. If test light does not illuminate, repair open in appropriate Black wire between Gray 16-pin IPC connector and IP ground splice pack. See GROUND DISTRIBUTION article in WIRING DIAGRAMS.
- Check for poor connections to IPC. Repair as necessary. If IPC connections are okay, replace IPC. See WIRING DIAGRAMS in appropriate ANALOG INSTRUMENT PANELS article.
Courtesy of GENERAL MOTORS CORP.