Mariner 4WD L4-2.5L Hybrid (2009)
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Pinpoint Test B: The Horn Is Always On
Horn
Pinpoint Tests
Pinpoint Test B: The Horn Is Always On
Refer to Wiring Diagram Set 44 (Escape/Mariner, Escape Hybrid/Mariner Hybrid), Horn/Cigar Lighter for schematic and connector information. See:
Diagrams/Electrical Diagrams/Diagrams By Number
Normal Operation
The Smart Junction Box (SJB) supplies the 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 CRH03 (BN). The
horn relay is then energized, applying voltage to the horn through circuit SRH01 (YE/RD), enabling the horn to sound.
This pinpoint test is intended to diagnose the following:
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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
PINPOINT TEST B: THE HORN IS ALWAYS ON
NOTICE: Use the correct probe adapter(s) when making measurements. Failure to use the correct probe adapter(s) may damage the
connector.
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B1 CHECK CIRCUIT SRH01 (YE/RD) FOR A SHORT TO VOLTAGE
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Ignition OFF.
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Disconnect: SJB C2280e.
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Does the horn continue to sound?
Yes
REPAIR the circuit. TEST the system for normal operation.
No
GO to B2.
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B2 CHECK THE HORN SWITCH INPUT
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Disconnect: SJB C2280b.
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Connect: SJB C2280e.
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Does the horn continue to sound?
Yes
GO to B6.
No
GO to B3.
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B3 CHECK CIRCUIT CRH03 (BN) FOR A SHORT TO GROUND
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Depower the Supplemental Restraint System (SRS). Refer to Air Bag Systems.
