For 1990-2009 cars

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

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

Models: | All OnStar equipped vehicles

This PI was superseded to update Recommendation/Instructions. Please discard PIC4310A.

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.

It is imperative that when retrieving ALL following information the vehicle is Outside in an Open Area

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PRL Outdated Status: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:

After retrieving the above information with tech 2 with the vehicle outside please look at the following information.

If Current SID reads 40000 or 03353, Call Mode 0, 13, 60, and Signal Strength of 0 or 106 the Cell Antenna Circuit need to be tested. When testing a Fluke Meter is preferred (J 39200) and have set on an Auto Ranging Scale. When making note of value also note the scale the meter is displaying. Please document if you connect to the OnStar center with no data (failed to Voice) at any time.

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.