GMC Yukon XL 2000–2006

▸Known issuesRed radio theft LED does not flash (manufacturer's counter not reset at assembly)1

1. Manufacturer communication2003–2005 GMC FULL SIZE TRUCKS AND UTILITIES (YUKON XL) ・ 2005-04-01

   Red radio theft LED does not flash: manufacturer's counter not reset at assembly

   1. 1Fault

      • 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.
      ↓→

   2. 2Finding 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.
      • Each cycle of the ignition switch reduces the counter by 1 count; once it reaches 0, the red LED starts to work normally.
      ↓→

   3. 3Correction

      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.
      2. To count as a cycle, the key must be left in the RUN and OFF positions for at 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.
      • SPS programming the radio will not correct the concern.
   Read the sentences of the record

   From the manufacturer’s document

   • 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.
   • Condition：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.
   • Cause：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.
   • Cause：Each cycle of the ignition switch reduces the counter by 1 count; once it reaches 0, the red LED starts to work normally.
   • Repair：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.
   • Repair：To count as a cycle, the key must be left in the RUN and OFF positions for at 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.
   • Caution：SPS programming the radio will not correct the concern.

   Open this issue of GM TechLink ↗ The points above are read from an article of TechLink, GM’s monthly publication for dealership technicians. The article itself is not reproduced here.

   Remedy

   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.