Intermittent No Crank No Start And/Or Dead Battery - keywords cluster communication DTC entertainment information inoperative IPC LX9 LZ9 MDM nocomm nocrank nostart OnStar part phatnoise tech2 UE1 UMS

This PI was superseded to update model years and engine options. Please discard PIT3763A.

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

Customers may report an intermittent No Crank, No Start and/or dead battery condition on vehicles equipped with either LX9 or LZ9 engines and the UMS (Phatnoise) system. It also maybe reported that there is no communication with any modules, the IPC is dark except for a check engine light, the OnStar/Entertainment systems, HVAC, and the power sliding doors are all inoperative until the DVD player or UMS (Phatnoise) system is disconnected. Engineering has determined that the software in the Mobile Media Player maybe inducing this concern.

Replace the Mobile Media Player.

Part Number

15239466 - Module ASM-Mobile Entertainment Data Cartridge Player (Gray)

15239487 - Module ASM-Mobile Entertainment Data Cartridge Player (Cashmere)

Note: The Module Assembly is only available through Model Electronics @ 800-433-9657

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.