Tribute 4WD L4-2.3L Hybrid (2008)
Pinpoint Test 1: The Horn Is Inoperative
PINPOINT TEST 1: THE HORN IS INOPERATIVE
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. Ground for the horn is supplied through
circuit (B/G).
Possible Causes
-
Fuse
-
Wiring, terminals or connectors
-
Steering wheel switch harness
-
Horn
-
Clockspring
-
Horn switch (part of the steering wheel)
-
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.
NOTE: Failure to disconnect the battery when instructed will result in false resistance readings. See See: Starting and Charging/Battery/Service and
Repair/Procedures/Battery Disconnect.