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Horn Symptom Diagnosis
Condition
Horn does not operate
Information Display Symptom Diagnosis (If Equipped)
NOTE:
This thermometer indicates the ambient temperature in back of front bumper member. Under any one
of the following listed conditions, however, even when the ambient temperature goes up, the
thermometer display does not rise so as to correct the rise of the ambient temperature caused by the
radiant heat of the engine. When the ambient temperature drops, the thermometer reading follows the
change in the temperature.
Be sure to bear this in mind when diagnosing trouble.
• The vehicle speed is 30 km/h (18 mph) or lower.
• VSS signal is faulty.
• The ignition switch is turned on again within 2 hours.
Condition
No displaying of
information display
Incorrect thermometer
display
Display does not change
at –30 C
Display does not change
at 50 C
Possible cause
Circuit fuse blown
Horn switch faulty
Horn relay faulty
Wiring or grounding faulty
Horn faulty
Possible cause
Circuit fuse Blown
Wiring and/or grounding faulty
Information display unit faulty
Outside air temperature sensor faulty
VSS signal faulty
Wiring and/or grounding faulty
BCM faulty
Outside air temperature is –30 C (–22
F) or less
Outside air temperature sensor faulty
Outside air temperature sensor wiring
circuit open circuit and/or short to power
circuit
BCM faulty
Outside air temperature is 50 C (122
F) or more
Outside air temperature sensor faulty
Outside air temperature sensor wiring
circuit short to ground circuit
BCM faulty
Instrumentation / Driver Info. / Horn:
Correction / Reference Item
Replace fuse and check for short circuit.
Check horn switch.
Check horn relay.
Repair circuit.
Replace horn.
Correction / Reference Item
Replace fuse and check for short circuit.
Repair as necessary.
Replace unit.
Check outside air temperature sensor referring
to "Outside Air Temperature Sensor
Inspection: ".
Check VSS referring to "DTC P0500: Vehicle
Speed Sensor (VSS) Malfunction: in Section
1A" or "DTC P0722: Output Speed Sensor
(VSS) Circuit No Signal: in Section 5A".
Repair as necessary.
Replace after making sure that none of above
parts is faulty.
—
Check outside air temperature sensor referring
to "Outside Air Temperature Sensor
Inspection: ".
Repair as necessary.
Replace after making sure that none of above
parts is faulty.
—
Check outside air temperature sensor referring
to "Outside Air Temperature Sensor
Inspection: ".
Repair as necessary.
Replace after making sure that none of above
parts is faulty.
9C-8
S4RS0A9304011
S4RS0A9304012
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