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GMC Yukon 2000–2006

GMC YukonModel years 2000–2006

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Common on this vehicle:Lights (headlights, turn signals)

issueTrailer brakes applied whenever headlamps or park lamps are on (brake controller jumper harness)Remove

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2 records state a cause or a remedy. Each record is shown as short labels in the order fault → finding the cause → correction. Press a label to narrow to the records that state it.

Read the records one by one (2)

Known issuesTrailer brakes applied whenever headlamps or park lamps are on (brake controller jumper harness)2

  1. Manufacturer communication2000–2003 GMC YUKON ・ 2003-02-01

    Trailer brakes applied with lamps on / controller backlighting wrong: jumper harness differs for 2003

    1. 1Fault

      • With the headlamps or park lamps on, the trailer brakes are always applied, or the back lighting of the trailer brake controller illuminates only when the brakes are applied.

    2. 2Finding the cause

      Possible causes

      • The condition may be due to wiring changes in the vehicle electrical system for the 2003 model year.

      Steps to confirm (in the document’s order)

      1. Inspect the brake controller wiring harness jumper plugged into the vehicle relay block body, which is under the left side of the instrument panel near the left kick panel, behind a plastic cover.
      2. The 1999 through early 2003 jumper has a reddish/brown 6-way connector and a tag with the last four digits of the harness part number; a second design 2003 jumper may have a white plastic connector with part number 5418.

    3. 3Correction

      Repair

      1. When a brake controller with its jumper attached is moved from a 2001-02 vehicle to a 2003 vehicle, the jumper harness connector must be changed.
      2. To use a 12171982, 15366255 or 15086884 harness in a 2003 vehicle, switch the wires in cavities A and D.
      3. To use a 15085418 harness in a 1999-2002 vehicle, switch the wires in cavities A and D.

      Parts

      • The 2000 jumper harness is PN 15366255, with a pink/purple tag reading 6255.
      • The 2001-02 jumper is PN 15086884, with an orange tag reading 6884.
      • The 2003 jumper is PN 15085418, with an orange tag reading 5418.

      Part numbers printed in the document

      The numbers are as the document prints them. The name and the replacing number are what the pages of GMPartsGiant, a reseller of genuine parts and not GM, state. Aftermarket equivalents are not checked here (the links only search by number). Confirm the fit for the vehicle (VIN) before ordering.

    Read the sentences of the record

    From the manufacturer’s document

    • Applies to：The affected vehicles include the 2000-03 Chevrolet Suburban and Tahoe and GMC Yukon and Yukon XL.
    • Condition：With the headlamps or park lamps on, the trailer brakes are always applied, or the back lighting of the trailer brake controller illuminates only when the brakes are applied.
    • Cause：The condition may be due to wiring changes in the vehicle electrical system for the 2003 model year.
    • Confirm：Inspect the brake controller wiring harness jumper plugged into the vehicle relay block body, which is under the left side of the instrument panel near the left kick panel, behind a plastic cover.
    • Confirm：The 1999 through early 2003 jumper has a reddish/brown 6-way connector and a tag with the last four digits of the harness part number; a second design 2003 jumper may have a white plastic connector with part number 5418.
    • Parts：The 2000 jumper harness is PN 15366255, with a pink/purple tag reading 6255.
    • Parts：The 2001-02 jumper is PN 15086884, with an orange tag reading 6884.
    • Parts：The 2003 jumper is PN 15085418, with an orange tag reading 5418.
    • Repair：When a brake controller with its jumper attached is moved from a 2001-02 vehicle to a 2003 vehicle, the jumper harness connector must be changed.
    • Repair：To use a 12171982, 15366255 or 15086884 harness in a 2003 vehicle, switch the wires in cavities A and D.
    • Repair：To use a 15085418 harness in a 1999-2002 vehicle, switch the wires in cavities A and D.

    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
    Trailer Controller Information 2000-03 - Chevrolet Suburban, Tahoe - GMC Yukon, Yukon XL Some customers may comment that when the headlamps or park lamps are on, the brakes on the trailer are always applied, or that the back lighting for the trailer brake controller illuminates only when the brakes are applied. This condition may be due to wiring changes within the vehicle electrical system for the 2003 model year. Inspect the brake controller wiring harness jumper that is plugged into the vehicle relay block body. The relay block body is located under the left side of the instrument panel near the left kick panel, behind a plastic cover. The 1999 through early 2003 wiring harness jumper that plugs into the relay block will have a reddish/brown 6-way connector and a tag with the last four digits of the wiring harness part number. Second design 2003 may have a white plastic connector with part number 5418 as well. - The 2000 jumper harness is PN 15366255. The pink/purple tag identifier is 6255. - the 2001-02 jumper is PN 15086884. The orange tag identifier is 6884. - The 2003 jumper is PN 15085418. The orange tag identifier is 5418. When transferring the brake controller with the wiring jumper attached from a 2001-02 vehicle to a 2003 vehicle, a change to the jumper harness connector must be performed. To modify a 12171982, 15366255 or 15086884 harness for use in a 2003 vehicle, switch the wires in cavities A and D. To modify a 15085418 harness for use in a 1999-2002 vehicle, switch the wires in cavities A and D

  2. Manufacturer communication2001–2003 GMC YUKON ・ 2002-11-01

    Trailer brakes applied when headlights/park lamps are on (bulletin 02-05-22-004A)

    1. 1Fault

    2. 2Finding the cause

      Not stated

    3. 3Correction

      Repair

      • The correction is to modify the brake controller wiring harness.
    Read the sentences of the record

    From the manufacturer’s document

    • Applies to：Bulletin 02-05-22-004A, which replaces 02-05-22-004, trailer brakes applied when headlights/park lamps are on and brake controller illumination, lists 2002-03 Cadillac Escalade, EXT, Chevrolet Avalanche, 2001-03 Chevrolet Silverado, Suburban, Tahoe, GMC Sierra, Yukon, XL and 2003 Hummer H2.
    • Repair：The correction is to modify the brake controller wiring harness.

    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
    Bulletins - October, 2002 02-05-22-004A; replaces 02-05-22-004; Trailer Brakes Applied when Headlights/Park Lamps are On, Brake Controller Illumination (Modify Brake Controller Wiring Harness); 2002-03 Cadillac Escalade, EXT, Chevrolet Avalanche, 2001-03 Chevrolet Silverado, Suburban, Tahoe, GMC Sierra, Yukon, XL, 2003 Hummer H2 Trailer Brakes Applied when Headlights/Park Lamps are On, Brake Controller Illumination (Modify Brake Controller Wiring Harness)