Wireing diagram for 1998 Toyota seana van radio hook up it is a dual car radio dxdm280bt

Apparently the Harrier is the same as the Lexus RX in the country where you live. It is a not a model in North America where we are.

https://www.google.com/search?q=1998+lexus+rx+stereo+wiring+diagram

https://www.google.com/search?q=1998+toyota+harrier+radio+wiring+diagram&

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for help u will find a lot of wiring diagrams and circuit diagrams help books and stuff like this at reliable-store
the girl in the chat box can help u instantly... im a frequent buyer there since Im a mechanic so take help from there

1983 Dodge Ram Van Audio Wireing Chart
Car Radio Battery Constant 12v+ Wire: Red
Car Radio Accessory Switched 12v+ Wire: Red/White
Car Radio Ground Wire: Chassis
Car Radio Illumination Wire: Black/Yellow
Left Front Speaker Positive Wire (+): Green
Left Front Speaker Negative Wire (-): Black/Red
Right Front Speaker Positive Wire (+): Violet
Right Front Speaker Negative Wire (-): Black/Red
Left Rear Speaker Positive Wire (+): Brown
Left Rear Speaker Negative Wire (-): Black/Red
Right Rear Speaker Positive Wire (+): Blue/Red
Right Rear Speaker Negative Wire (-): Black/Red

If you have Van Manual, with wireing diagram, they should show you fuse box, and what fuses do what.

Check on internet autozone may have help

Sign up free at (www.12volt.com) and you can access all wiring diagrams etc required. Excellent site for reference.

Depending on what radio you are putting in, You may need an adapter pigtail. Read the directions closely.

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YOU WILL HAVE TO TRACE THE WIRES OUT, DO U HAVE A SEPERATE AMPLFIER? MANY OF THESE VANS DO, IF SO THAT IS THE PROBLEM.
HERE IS THE WIRING COLOR DIAGRAM FOR YOUR VAN
1998 Dodge Caravan Car Radio Stereo Audio Wiring Diagram
Car Radio Constant 12v+ Wire: Pink
Car Radio Switched 12v+ Wire: Red/White
Car Radio Ground Wire: Chassis
Car Radio Illumination Wire: Black/Yellow
Car Stereo Dimmer Wire: N/A
Car Stereo Antenna Trigger: N/A
Car Stereo Amp Trigger Wire: N/A
Car Stereo Amplifier Location: N/A
Car Audio Front Speakers Size: N/A
Car Audio Front Speakers Location: N/A
Left Front Speaker Positive Wire (+): Green
Left Front Speaker Negative Wire (-): Brown/Red
Right Front Speaker Positive Wire (+): Violet
Right Front Speaker Negative Wire (-): Blue/Red
Car Audio Rear Speakers Size: N/A
Car Audio Rear Speakers Location: N/A
Left Rear Speaker Positive Wire (+): Brown/Yellow
Left Rear Speaker Negative Wire (-): Brown/Light Blue
Right Rear Speaker Positive Wire (+): Blue/Orange
Right Rear Speaker Negative Wire (-): Blue/White

Clck here for the correct wire colors for Toyota. http://www.autotoys.com/New_Tech/Wire_codes/TOYOTA_WIRE_COLORS/toyota_wire_colors.htm