RKE IPC / DIC Radio HVAC Center Stack Lighting OnStar Inoperative Or No Electrical Power - keywords battery connector entry fob keyless

This PI was superseded to update model years. Please discard PIC4815.

The following diagnosis might be helpful if the vehicle exhibits the symptom(s) described in this PI.

RKE, IPC/DIC, Radio, Center Stack lighting, OnStar inoperative or no electrical power. The HVAC will go into a fixed setting of medium blower and defrost and the HVAC controls will be inoperative.

Transit isolation connector - the transit isolation connector is disconnected prior to vehicle shipping to isolate circuits which require constant electrical drain. The connector, which is blue in color, is located in the battery compartment within the vehicle trunk (left rear quarter panel). Connect the two mating blue connectors to energize the affected circuits, including the radio/HVAC, supplemental instrument clusters in the IP center stack area, IP cluster, OnStar and remote lock/ unlock.

Important: It is critical that the two parts of the connector are fully assembled until a "click" is heard. The connector only connects one way. Pull on the connector with light pressure to confirm that the two connectors (ends) cannot be easily separated.

Please follow this diagnostic or repair process thoroughly and complete each step. If the condition exhibited is resolved without completing every step, the remaining steps do not need to be performed.