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Source reference 2005-04-52

Manufacturer communication — 2003 GMC FULL SIZE TRUCKS AND UTILITIES (YUKON)

Reporter type: Manufacturer

Vehicles as recorded

What the manufacturer’s document says

fault and correction ・ names no model (for full-size utilities)

Applies to

  • Applies to 2003 -05 Chevrolet, GMC, Cadillac and Hummer H2 full size trucks and utilities: owners may comment that the red radio theft LED does not flash.

    the passage
    Owners of some 2003 -05 Chevrolet, GMC, Cadillac, and Hummer H2 full size trucks and utilities may comment that the red radio theft LED does not flash.

Fault

  • Starting with the 2003 model year, owners no longer enter a security code into the radio to activate the theft feature; it works automatically by learning a portion of the VIN.

    the passage
    Starting with the 2003 model year, owners no longer have to enter a security code into the radio to activate the theft feature like earlier model years. The radio theft feature works automatically by learning a portion of the VIN.

Finding the cause

Possible causes

  • During assembly of the radio a manufacturer's counter is set at 255 counts and should be set to 0 at the end of assembly; if the counter is not set to 0, the radio LED will not flash.

    the passage
    During assembly of the radio, a manufacturer’s counter is set at 255 counts for assembly purposes and should be set to 0 counts at the end of assembly. If the counter is not set to 0, the radio LED will not flash.

  • Each cycle of the ignition switch reduces the counter by 1 count; once it reaches 0, the red LED starts to work normally.

    the passage
    Each cycle of the ignition switch reduces the counter by 1 count. Once the counter reaches 0, the red LED starts to work normally.

Correction

Repair

  1. If an owner wants the LED to operate immediately, cycle the ignition key as many times as required to run the remaining counts to 0.

    the passage
    If an owner requests the LED to operate immediately, the ignition key must be cycled as many times as required to run the remaining counts to 0.

  2. To count as a cycle, the key must be left in the RUN and OFF positions for at least 3 seconds each.

    the passage
    To count as a cycle, the key must be left in the RUN and OFF positions for least 3 seconds each.

Caution

  • So that Retained Accessory Power (RAP) does not keep the radio alive with the ignition off, the driver's door must be open during the key on/key off process.

    the passage
    TIP: To prevent the Retained Accessory Power (RAP) from keeping the radio alive when the ignition is off, be sure the driver’s door is open during the key on/key off process.

  • SPS programming the radio will not correct the concern.

    the passage
    TIP: SPS programming the radio will not correct the concern.

Compiled by reading the full text of the document; each point stands on the passage shown. Check the document itself, linked below, before working on a vehicle.

Stated content

  1. Communication summary

    ラジオの盗難防止 LED が点滅しない 2003 -05 の Chevrolet、GMC、Cadillac、Hummer H2 のフルサイズトラックおよびユーティリティの一部の所有者が、ラジオの赤い盗難防止 LED が点滅しないと訴えることがある。 2003 年式から、所有者はそれ以前の年式のように盗難防止機能を有効にするためにセキュリティコードをラジオに入力する必要がなくなった。ラジオの盗難防止機能は、VIN の一部を学習することで自動的に働く。 ラジオの組立中、メーカーのカウンターは組立のために 255 カウントに設定され、組立の終わりに 0 カウントに設定されることになっている。カウンターが 0 に設定されていないと、ラジオの LED は点滅しない。 イグニッションスイッチの操作のたびに、カウンターは 1 カウント減る。カウンターが 0 に達すると、赤い LED は正常に働き始める。 所有者が LED をすぐに作動させるよう求める場合は、残りのカウントが 0 になるまで必要な回数だけイグニッションキーを操作しなければならない。 操作として数えられるには、キーを RUN と OFF の位置にそれぞれ少なくとも 3 秒間置かなければならない。 ヒント：イグニッションがオフのときにリテインドアクセサリーパワー（RAP）がラジオを作動させたままにしないよう、キーのオン／オフの操作の間は必ず運転席ドアを開けておくこと。 ヒント：ラジオを SPS でプログラムしても、この不具合は直らない。 Machine translation (unreviewed)

    Radio Theft LED Does Not Flash Owners of some 2003 -05 Chevrolet, GMC, Cadillac, and Hummer H2 full size trucks and utilities may comment that the red radio theft LED does not flash. Starting with the 2003 model year, owners no longer have to enter a security code into the radio to activate the theft feature like earlier model years. The radio theft feature works automatically by learning a portion of the VIN. During assembly of the radio, a manufacturer’s counter is set at 255 counts for assembly purposes and should be set to 0 counts at the end of assembly. If the counter is not set to 0, the radio LED will not flash. Each cycle of the ignition switch reduces the counter by 1 count. Once the counter reaches 0, the red LED starts to work normally. If an owner requests the LED to operate immediately, the ignition key must be cycled as many times as required to run the remaining counts to 0. To count as a cycle, the key must be left in the RUN and OFF positions for least 3 seconds each. TIP: To prevent the Retained Accessory Power (RAP) from keeping the radio alive when the ignition is off, be sure the driver’s door is open during the key on/key off process. TIP: SPS programming the radio will not correct the concern.
    Go to this passage in the original

Source

Source
GM TechLink
Source reference
2005-04-52
Received by source
2005-04-01
Incident date
Unknown

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