Tribute 4WD L4-2.5L Hybrid (2009)
Step 10
Pinpoint Test 2: The Horn Is Always On
PINPOINT TEST 2: THE HORN IS ALWAYS ON
Normal Operation
The smart junction box (SJB) supplies the control voltage to the horn relay (part of the SJB). When the horn switch (part of the steering wheel) is
pressed, the switch closes and ground is applied from the steering wheel switch harness through the clockspring to the horn relay through circuit (BR).
The horn relay is then energized, applying voltage to the horn through circuit (Y/R), enabling the horn to sound.
Possible Causes
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Wiring, terminals or connectors
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Steering wheel switch harness
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Clockspring
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Horn switch (part of the steering wheel)
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SJB
Diagnostic Procedure
CAUTION:Use the correct probe adapter(s) when making measurements. Failure to use the correct probe adapter(s) may damage the connector.