Instrument Panel Cluster (IPC) System Check

WARNING: This page does not describe the selected car, but rather 6 other vehicles, including the 1999 Oldsmobile Bravada, 1999 GMC Sonoma, 1999 GMC Jimmy, 1999 GMC Envoy, and 1999 Chevrolet S10 Pickup. However, it is still accessible from the selected car via links, so may be relevant.

NOTE: To identify modules on serial data line, see appropriate wiring diagram in DATA LINK CONNECTORS article in WIRING DIAGRAMS.

Turn ignition off. Connect scan tool to Data Link Connector (DLC). If scan tool powers up, go to next step. If scan tool does not power up, go to SCAN TOOL INOPERATIVE under SELF-DIAGNOSTIC SYSTEM.
Using scan tool, attempt to communicate with Instrument Panel Cluster (IPC), Vehicle Control Module/Powertrain Control Module (VCM/PCM), Body Control Module (BCM), Electronic Brake Control Module (EBCM) and Sensing Diagnostic Module (SDM) on serial data line using MESSAGE MONITOR feature. If a problem exists, repair wiring as necessary. See appropriate wiring diagram in DATA LINK CONNECTORS article in WIRING DIAGRAMS. If all modules communicate, go to next step.
Using scan tool, select DISPLAY DTCS for following modules:
- Automatic Transfer Case (ATC)
- Instrument Panel Cluster (IPC)
- Body Control Module (BCM)
- Vehicle Control Module/Powertrain Control Module (VCM/PCM)
- Electronic Brake Control Module (EBCM)
- Supplemental Inflatable Restraint (SDM)
If scan tool displays any DTCs, go to next step. If scan tool does not display any DTCs, check is complete. Review DESCRIPTION and OPERATION for any additional information.
If scan tool displays DTC B1367, see DTC B1367: IPC IGNITION 0 CIRCUIT LOW under DIAGNOSTIC TESTS. If scan tool displays any DTCs other than B1367, see BCM DTC DEFINITIONS table under SELF-DIAGNOSTIC SYSTEM in Body Control Modules - Blazer, Bravada, Envoy, Jimmy, Sonoma & S10 Pickup article.