GM TechLink 2003-02-01
Original text and source
Original text
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
Source
- Source
- GM TechLink — Communication from a manufacturer to dealers (summary published by a government agency)
- Reporter type
- Manufacturer
- Source reference
- 2003-02-01
- Country / market
- US
- Language
- en
- Document version
- Version 3 (3 held)
- Note on the source
- Copyright General Motors Corporation. No licence is stated. Held as the headline and short quoted passages with the issue named and linked; the articles themselves are not stored or shown.
Dates
- Incident date
- Unknown
- Received by source
- 2003-02-01
- Added to the source's file
- Unknown: not returned by the source API
- Issued / published
- 2003-02-01
- First observed
- 2026-10-06 09:03 UTC (initial bulk load)
- This version fetched
- 2026-10-09 12:52 UTC