Instrument Panel Cluster (IPC) System Check

NOTE: To identify modules on serial data line, see 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 IPC, VCM/PCM, BCM, EBCM and SDM on serial data line using MESSAGE MONITOR feature. If a problem exists, repair wiring as necessary. See 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 any DTCs beginning with "U", repair Class 2 serial data wiring as necessary. See DATA LINK CONNECTORS article in WIRING DIAGRAMS. If scan tool displays DTC B1397, B1398 or B1480, see BCM DTC DEFINITIONS table under SELF-DIAGNOSTICS in BODY CONTROL MODULES - BLAZER, BRAVADA, ENVOY, JIMMY, SONOMA & S10 PICKUP article. If scan tool displays any DTCs other than B1397, B1398, B1480 or those beginning with "U", see appropriate test under DIAGNOSTIC TESTS .