OnStar Remote Functions Operational Check - antenna blue cellular communication data electrical GPS horn inoperative lock operation remote signal SMU telephone UA1 UE1 VCIM VCU VIU weak #PI01358 - (Sep 11, 2003)

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When servicing the vehicle with the VIN you entered, the following diagnosis might be helpful if the vehicle exhibits the described symptoms.

Condition/Concern:

An owner complaint of no remote service capability may be received. This concern could be accompanied by other concerns which may or may not be related. If the owner has concerns with exterior lighting, the horn operation and/or the door lock features of the vehicle separate from and OnStar concern, these concerns must be remedied using normal SI diagnostics prior to any OnStar diagnosis being performed. Once these features are all functioning as they should, OnStar can be contacted as per the procedure below.

1. With the vehicle in an open area with a clear view of the sky, press the blue OnStar button. Wait for the OnStar advisor to answer. Ask the advisor if they have data and GPS readings on this vehicle. If you do not connect or they donot have both of these items, this condition must be remedied prior to performing the following test. Follow normal SI diagnostics.
2. Connect the Tech 2 and enter vehicle information such as make, model, year, and option content etc.
3. Navigate to the body computer area of the vehicle electrical system. Perform a function such as honking the horn, lock/unlock the doors or flash the exterior lighting using the Tech 2 and BCM output controls. If this vehicle does not have this capability for all three of these items, choose whichever one it can do with the Tech 2 for the next step. Once you have successfully performed the function with the Tech 2 proceed. All vehicles should be able to perform the door unlock command using the Tech 2. All DTCs within the Body section of the vehicle, especially those beginning with the letter U (communication DTC) must be addressed to make sure all systems are operational before proceeding further.
4. Navigate to the message monitor screen with ignition key in the off/locked position and all doors closed and no inputs to any module being activated. Observe all modules present for active/inactive state. All modules should return to inactive state within a ten minute period. If this does not happen there may be a concern that needs addressing prior to going further with this test.
5. Using the sleep mode function, put all modules to sleep. Observe the modules for a period of two minutes to make sure they remain inactive. If they donot, diagnose the reason for the activity prior to proceeding.
6. You will see a timer at the bottom of the screen when in this state. This timer will stop once a module becomes active. When modules becomes active, the first module to become active will be listed at the top of the message monitor list. The modules will be listed in their subsequent active order.
7. Contact OnStar Center on the dealer phone and/or a cell phone and request the center perform remote functions on vehicle such as lock or unlock doors, flash lights, honk the horn.
Note: You must have the owner's permission for OnStar to perform any of these functions. This would include their PIN number to be given to the OnStar advisor you are speaking with. Donot call the center unless you have this information readily available along with the owner's full name and address for verification purposes.
8. Observe the Tech 2 message monitor screen. At the time of the remote function request from the OnStar Center to the vehicle you will notice a change of state from inactive to active on this screen for various modules. This change of state will occur within a ten minute time frame from the time of your call to the OnStar center. If the OnStar module does go active, also look for the BCM (which may have one of several names) to go active also. You may observe any number of modules go active as a result of this request from the OnStar Center including the IPM, RIM, IPC, RFA, etc. This is normal as this network is required to perform the requested service.
9. If this sequence does not occur as described, turn the ignition key to the run position. Request the OnStar Center perform services again. If the requested service can be performed with the ignition on there may be a concern with the cellular system in your area. To check this, perform this same procedure on a known working vehicle. If both vehicles can perform the requested service with the key in the run position please report this to GM Technical Assistance - OnStar for diagnostic purposes.
10. Report all your findings to GM Technical Assistance - OnStar should this vehicle not perform as requested.

If the vehicle performs the requested service, the concern may be intermittent and/or random in nature. Diagnosing such a concern may entail questioning the owner as to location, the date of the incident and/or the battery condition etc. These items will assist GM Technical Assistance - OnStar in diagnosing the concern.

Recommendation/Instructions:

Repair all lighting, horn or door lock concerns prior to performing this procedure. If this procedure reveals a concern with the OnStar system and the BCM interaction, GM TAC - OnStar should be contacted for further assistance.

Please follow this diagnosis 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. If these steps do not resolve the condition, please contact GM TAC for further diagnostic assistance. This diagnostic approach was developed for the vehicle with the VIN you entered and should not be automatically be used for other vehicles with similar symptoms.

Models:

(96, 97, 98, 99, 00, 01, 02, 03, 04 OnStar - equipped GM vehicles with a current subscription)

GM bulletins are intended for use by professional technicians, NOT a "do-it-yourselfer".  They are written to inform these technicians of conditions that may occur on some vehicles, or to provide information that could assist in the proper service of a vehicle.  Properly trained technicians have the equipment, tools, safety instructions, and know-how to do a job properly and safely.  If a condition is described, DO NOT assume that the bulletin applies to your vehicle, or that your vehicle will have that condition.  See your GM dealer for information on whether your vehicle may benefit from the information.

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