Manufacturer communication — 2000 GMC YUKON

• The affected vehicles include the 2000-03 Chevrolet Suburban and Tahoe and GMC Yukon and Yukon XL.

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  2000-03 - Chevrolet Suburban, Tahoe - GMC Yukon, Yukon XL

• 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.

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  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.

Possible causes

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

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  This condition may be due to wiring changes within 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.

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   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.

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.

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   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.

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.

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   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.

2. To use a 12171982, 15366255 or 15086884 harness in a 2003 vehicle, switch the wires in cavities A and D.

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   To modify a 12171982, 15366255 or 15086884 harness for use 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.

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   To modify a 15085418 harness for use 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.

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  - The 2000 jumper harness is PN 15366255. The pink/purple tag identifier is 6255.

• The 2001-02 jumper is PN 15086884, with an orange tag reading 6884.

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  - the 2001-02 jumper is PN 15086884. The orange tag identifier is 6884.

• The 2003 jumper is PN 15085418, with an orange tag reading 5418.

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  - The 2003 jumper is PN 15085418. The orange tag identifier is 5418.