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Impreza WRX STI F4-2.5L DOHC Turbo
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Repair and Diagnosis
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Lighting and Horns
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Horn
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Testing and Inspection
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Horn System
Horn System
INSPECTION
1.
HORN RELAY
Measure the security horn relay resistance between terminals (indicated in the table below) when connecting terminal No.4 to battery positive terminal and terminal No.3 to battery ground terminal.