For 1990-2009 cars

# Unable To Connect To OnStar Or Use OnStar Handsfree Calling Digital Hardware - keywords cellt cellular communication digital failedtovoice information intermittent OnStar OPC operation no noconnect

Subject: | Unable to connect to OnStar or use OnStar handsfree calling Digital Hardware

Models: | All OnStar equipped vehicles

This PI was superseded to update model years, keywords and Condition/Concern. Please discard PIC4310.

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

### Condition/Concern:

The OnStar Blue button, emergency -red button or/and HFC (call answer/end button) key press results in: Cell messages, progression tones (1 every 6 seconds), dropped calls or failed to voice call. A possible cause could be a lack/limited cellular coverage or outage in the area. Incorrect PRL or incorrect home SID may cause this concern.

### Recommendation/Instructions:

The following information is to be retrieved with the Tech2 before calling General Motors Technical Assistance.

Module ID 2

8 Digit GM part number:

Electronic Serial Number:

VCI Module Station ID:

Module ID:

Data Display

Signal Strength:

Signal Type:

Trans ID:

Cellular Information

Call mode:

Current System ID:

Digital Home NID:

Digital Home SID:

PRL Outdated Status:

PRL Version Number:

Off Board Navigation (Gen 7):

Program Phone Number

MIN:

MDN:

Perform an outbound OnStar personal call:

Results:

OnStar key press

Results:

Can the vehicle receive a call?

Results:

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.