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Saabs and Volvos | ABS fix
2004 Aero Wagon fix for ABS/TCS warning due to wiring problem (loss of communication w/rear wheels). Started having problem in 2010. Sent ABS unit off to BBS, problem returned. Dealer checked with Tech 2 and replaced left rear wheel sensor.

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Driver's side rear passenger (US spec)
The wiring bundle comes in at the base of the footwell so you need to get under the carpet. When the dealer replaced the wheel sensor they stated if problem returned the fault was probably in the wiring junction. But I never knew where to look until now.
Last modified: Jul 23, 2014

Pull up door sill
Remove the rear seat and use a flat screwdriver to gently pull up door sill. Prop up carpet.
Last modified: Jul 22, 2014

Here's the wiring bundle
Cut the zip tie and slice open the wiring bundle.
Last modified: Jul 22, 2014

There are two sets of one brown and one black wire in a black casing (one set from each rear wheel).
Last modified: Jul 22, 2014

One wheel wires
The wires from one wheel are brown connecting to white/brown stripe and black to black/white stripe.
Last modified: Aug 3, 2014

Other rear wheel wires
The other bundle is black wire to black wire and brown to brown.
Last modified: Jul 22, 2014

Crimp connection
When I cut open the connector, this shows the copper wire crimped to the silver wire. This is where corrosion or oxidation may be causing resistance to the current especially in hot weather. Heat increases resistance to current flow in wire.
Last modified: Jul 22, 2014

I cut out the hard black junction insulator and spliced, soldered and heat shrink wrapped the wires together with red insulated copper stranded wire.
Last modified: Jul 23, 2014

I rewrapped and ziptied the bundle back as original.
Last modified: Jul 22, 2014

Got the carpet back in place and popped the sill back in. Finished. Easy. A left handed person may have an advantage on this DIY project. Thanks to Bernie, Dean and others who supplied WIS info and experience so I could finally fix this.
Last modified: Dec 12, 2014
Jak Stoll Performance
M Car Covers
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