Manufacturer communication — 2006 GMC YUKON DENALI XL

• Applies to 2000-2014 GM passenger cars and light duty trucks and listed 2015 models, including 2015 GMC Yukon models built without VV4, equipped with OnStar (RPO UE1).

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  2000-2014 GM Passenger Cars and Light Duty Trucks 2015 Buick Enclave 2015 Cadillac Escalade Models (Built W/O VV4) 2015 Chevrolet Camaro, Express, Traverse 2015 Chevrolet Silverado 2500/3500, Suburban, Tahoe (Built W/O VV4) 2015 GMC Acadia, Savana 2015 GMC Sierra 2500/3500, Yukon Models (Built W/O VV4) Equipped with OnStar® (RPO UE1)

• Canadian wireless providers plan to decommission their 2G CDMA network through 2015, so Canadian vehicles without OnStar 3G/4G LTE need a hardware upgrade to keep OnStar services.

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  Canadian wireless service providers plan to decommission their 2G Code Division Multiple Access (CDMA) network through 2015. OnStar® currently depends on active and functioning 2G CDMA networks to deliver services. As a result, in order to continue to provide OnStar® services without interruption, Canadian vehicles that do not have OnStar® 3G/4G LTE will need a hardware upgrade.

Possible causes

• Disconnecting power to the OnStar module with the ignition ON or RAP active may activate the OnStar back-up battery, which is not rechargeable and must be replaced once discharged below a specified voltage threshold.

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  Disconnecting power to the OnStar® module in any way while the ignition is ON or with retained accessory power (RAP) activated may cause activation of the OnStar® Back-Up Battery. Once the Back-Up Battery is activated it will stay on until the power is restored back to the telematics communication interface control module. The back-up battery is not rechargeable and once discharged below a specified voltage threshold the back-up battery must be replaced.

Steps to confirm (in the document’s order)

1. Before reprogramming, verify the battery voltage is more than 12 volts but less than 16 volts; the battery must be fully charged.

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   Verify the battery voltage is more than 12 volts but less than 16 volts before proceeding with reprogramming. The battery must be fully charged BEFORE reprogramming.

2. The Tech 2 cannot communicate with the upgraded OnStar module; GDS 2 must be used for diagnostics specific to the upgraded OnStar system.

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   The Tech 2 is not capable of communicating with the upgraded OnStar® module. GDS 2 must be utilized to perform diagnostics specific to the upgraded OnStar® system on these vehicles.

Repair

1. When installing module P/N 23235234 (one of the listed modules), transfer the Bluetooth antenna, if equipped, to the new module.

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   If installing the modules P/N 23230482, 23230536, 23230537, 23235220, 23235227, 23235234 and 23383877, transfer the Bluetooth Antenna (1), if equipped, to the new module.

2. If the vehicle requires a UHF adaptor cable (P/N 23242478), install it to the antenna connector of the module and install the female to male cable (P/N 23242476) to the module, then connect both to the vehicle cables.

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   If the vehicle requires a UHF adaptor cable (P/N 23242478) proceed with this step: 4.1. Install the UHF adapter cable (P/N 23242478) to the antenna connector (1) of the module. 4.2. Install the female to male cable (P/N 23242476) to the module (2). 4.3. Connect the UHF adapter (1) and the female to male (2) connector to the vehicle cables.

3. In SPS select 'Reprogram ECU' for Telematics Communication Interface Control Module programming even if the unit is being replaced.

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   Due to a change in SPS you must select ‘Reprogram ECU’, for Telematics Communication Interface Control Module Programming from the Selected Programming Process even if the unit is being replaced.

4. Turn the ignition ON and press the OnStar Blue Button to call OnStar; the vehicle must be in an area with a strong cellular network for this step.

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   Turn the ignition to the ON position and press the OnStar® Blue Button to call OnStar®. Note: The vehicle must be located in an area with a strong cellular network to perform this step.

5. The labor time table lists 1.0 hr for 2003-2006 GMC Yukon models.

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   GMC Yukon Models 2003-2006 1.0 hr

Parts

• The parts chart row for 2003-2006 GMC Yukon models lists 23235234, 23242476 and 23242478.

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  2003-2006 GMC Yukon Models 23235234 23242476 23242478

Caution

• Hardware upgrade sets are VIN specific and must be installed on the vehicle the set was ordered for.

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  Hardware upgrade sets are VIN specific and must be installed on the vehicle that the set was ordered for.

• Make sure the ignition is off and RAP is deactivated before removing the OnStar module.

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  MAKE SURE IGNITION IS OFF AND RAP IS DEACTIVATED PRIOR TO REMOVAL OF THE ONSTAR® MODULE.

• After programming, turn the ignition OFF and wait five minutes; a 5 minute wait is required to avoid configuration errors.

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  Turn the ignition to the OFF position and wait five minutes. Notice: A 5 minute wait time is required to avoid configuration errors.

• Do not press the red OnStar Emergency Button at any time during the installation; this causes module configuration issues.

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  Do NOT press the RED (OnStar® Emergency Button) at any time during the installation. This will cause module configuration issues.