How to hook up aftermarket stereo?
Can't figure out the wiring coming out the dash to hook up my stereo

For 1998, Volkswagen made some changes to its lineup of special-edition Jettas. The Jazz and Trek, available the previous year, were gone. New to the lineup was the Jetta K2, designed to appeal to winter sports enthusiasts. It came with either skis or a snowboard, special upholstery and gauges, and an upgraded stereo system, among other special features. In addition, the Wolfsburg Edition returned to the lineup.
The Jetta K2, as well as the Wolfsburg Edition, the base-model Jetta GL, the sporty Jetta GT, and the higher-end Jetta GLS, came with a 115-horsepower, 2.0-liter four-cylinder engine that had been the workhorse of the Jetta fleet for a number of years. It was linked to a five-speed manual transmission, which was standard. A four-speed automatic was optional.
Also in the lineup was the Jetta GLX, which was equipped with a 172-hp, 2.8-liter V6 engine and came with a full range of standard features, including a power sunroof, air conditioning, a leather-trimmed steering wheel, antilock brakes, a Bose audio system, and a sport-tuned suspension.
Drivers had mixed opinions of the 1998 Jetta. Some offered high praise for the car, citing its roominess, reliability, handling, and performance as positive points. Others were less than enthusiastic about their cars, noting a lack of quality and the need for numerous repairs.
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Airbags
Dual front airbags · Front side airbags
Audio System
AM/FM radio
Brakes
ABS: 4-wheel
Convenience Features
Multi-function remote: keyless entry · Steering wheel: tilt-adjustable
Roof
Moonroof: power
Seats
Front seat type: bucket · Upholstery: cloth
Tires and Rims
Wheels: alloy
Windows
Front wipers: intermittent
Airbags
Dual front airbags · Front side airbags
Audio System
AM/FM radio
Brakes
ABS: 4-wheel
Convenience Features
Multi-function remote: keyless entry · Steering wheel: tilt-adjustable
Roof
Moonroof: power
Seats
Front seat type: bucket · Upholstery: cloth
Tires and Rims
Wheel type: aluminum alloy
Windows
Front wipers: intermittent
Airbags
Dual front airbags · Front side airbags
Audio System
AM/FM radio
Brakes
ABS: 4-wheel
Convenience Features
Multi-function remote: keyless entry · Steering wheel: tilt-adjustable
Mirrors
Exterior mirrors: power
Roof
Moonroof: power
Seats
Front seat type: bucket · Upholstery: cloth
Tires and Rims
Wheels: alloy
Windows
Front wipers: intermittent
Airbags
Dual front airbags · Front side airbags
Audio System
AM/FM radio
Comfort Features
Steering wheel trim: leather
Convenience Features
Multi-function remote: keyless entry · Steering wheel: tilt-adjustable
Mirrors
Exterior mirrors: power
Roof
Moonroof: power · Roof rack color: black
Seats
Front seat type: bucket · Upholstery: cloth
Windows
Front wipers: intermittent
Airbags
Dual front airbags · Front side airbags
Audio System
CD changer: 6 · AM/FM radio · Remote CD changer location: in cargo area
Brakes
ABS: 4-wheel
Comfort Features
Steering wheel trim: leather
Convenience Features
Multi-function remote: trunk release · Steering wheel: tilt-adjustable
Mirrors
Exterior mirrors: power
Roof
Moonroof: power
Seats
Front seat type: bucket · Upholstery: cloth
Tires and Rims
Wheel type: aluminum alloy
Windows
Front wipers: intermittent
Airbags
Dual front airbags · Front side airbags
Audio System
Premium Brand: Bose · AM/FM radio
Brakes
ABS: 4-wheel
Convenience Features
Multi-function remote: keyless entry · Steering wheel: tilt-adjustable
Mirrors
Exterior mirrors: heated
Roof
Moonroof: power
Seats
Front seat type: bucket · Heated: front seats · Upholstery: cloth
Tires and Rims
Wheel type: aluminum alloy
Windows
Front wipers: intermittent
Airbags
Dual front airbags · Front side airbags
Audio System
Single disc in-Dash CD · Premium Brand: Bose · AM/FM radio
Brakes
ABS: 4-wheel
Comfort Features
Shift knob trim: leather · Steering wheel trim: leather
Convenience Features
Multi-function remote: trunk release · Steering wheel: tilt-adjustable
Mirrors
Exterior mirrors: heated
Roof
Moonroof: power
Seats
Front seat type: bucket · Heated: front seats · Upholstery: leather
Tires and Rims
Wheel type: aluminum alloy
Windows
Front wipers: intermittent