TL AWD V6-3.7L (2010)
Horn Switch: Testing and Inspection
Horn Switch Test
NOTE:
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SRS components are located in this area. Review the SRS component locations See: Restraint Systems/Air Bag Systems/Locations, precautions
and procedures See: Body and Frame/Interior Moulding / Trim/Dashboard / Instrument Panel/Air Bag(s) Arming and Disarming/Service and
Repair before doing repairs or servicing.
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Check for a blown No. 10 (20 A) fuse in the under-hood fuse/relay box. If it is blown, check for a faulty horn relay (built in the relay circuit board)
See: Power and Ground Distribution/Testing and Inspection.
1. Remove the steering column covers See: Steering and Suspension/Steering/Steering Column/Steering Column Cover/Service and Repair.
2. Disconnect the dash board wire harness 20P connector (A) from the cable reel (B).
3. Connect dash board wire harness 20P connector terminals No. 1 and No. 2 with a jumper wire. The horns should sound.
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If the horns sound, go to step 7.
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If the horns don't sound, go to step 4.
4. Remove the jumper wire from the horn switch 20P connector.
5. Check for continuity between dash board wire harness 20P connector terminal No. 2 and body ground. There should continuity.
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If there is continuity, go to step 6.
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If there is no continuity, repair an open or high resistance in the wire, or poor ground (G405).
6. Measure the voltage between dashboard wire harness 20P connector terminal No. 1 and body ground. There should be battery voltage.
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If there is battery voltage, replace the horns.
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If there is no battery voltage, repair an open in the wire, or faulty driver's MICU; replace the driver's under-dash fuse/relay box.
7. Reconnect dashboard wire harness 20P connector to the cable reel, then remove the driver's airbag assembly See: Restraint Systems/Air Bag
Systems/Air Bag/Service and Repair/Removal and Replacement/Driver's Airbag Replacement.
8. Connect cable reel subharness 20P connector terminals No. 11 and No. 12 with a jumper wire. The horns should sound.
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If the horns sound, go to step 9.
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If the horns don't sound, repair open in the wire, or replace the cable reel See: Restraint Systems/Air Bag Systems/Clockspring Assembly /
Spiral Cable/Service and Repair.
