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Contents Wiring diagrams Section: Horns All sections

Horn System Acura TL IV

Horns 7 illustrations ~507 words

Scheme 1

Scheme 1: Component Location Index
Scheme 1: Component Location Index

Scheme 2

Scheme 2: Circuit Diagram
Scheme 2: Circuit Diagram

Scheme 3

Scheme 3: Horn Test/Replacement
Scheme 3: Horn Test/Replacement

Scheme 4

Scheme 4
Scheme 4
  1. Remove the front bumper (see «FRONT BUMPER REMOVAL/INSTALLATION»(/acura/tl/iv-2008-2011/remont/exterior-body-panels/#bumper-system__front-bumper-removalinstallation) )
  2. Disconnect the 1P connector (A) from each horn (B)
  3. Test the horn by momentarily connecting battery power to the terminal (A) and grounding the bracket (B) The horn should sound
  4. If it fails to sound, replace it

Horn Switch Test

Note. SRS components are located in this area. Review the SRS component locations (see COMPONENT LOCATION INDEX under Supplemental Restrain System), precautions and procedures (see PRECAUTIONS AND PROCEDURES ) before doing repairs or servicing 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 RELAY TEST )

Scheme 5

Scheme 5: Horn Switch Test
Scheme 5: Horn Switch Test

Scheme 6

Scheme 6
Scheme 6

Scheme 7

Scheme 7
Scheme 7
  1. Remove the steering column covers (see «STEERING COLUMN COVER REMOVAL/INSTALLATION»(/acura/tl/iv-2008-2011/remont/exteriorinterior-trim/#dashboard__steering-column-cover-removalinstallation) )
  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 If the horns sound, go to step 7 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 If there is continuity, go to step 6 If there is no continuity, repair open or high resistance in the wire, or poor ground (G501)
  6. Measure the voltage between dashboard wire harness 20P connector terminal No 1 and body ground There should be battery voltage If there is battery voltage, replace the horns 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 «DRIVER'S AIRBAG REPLACEMENT»(/acura/tl/iv-2008-2011/remont/airbag/#srs-supplemental-restraint-system__drivers-airbag-replacement) )
  8. Connect cable reel subharness 20P connector terminals No 11 and No 12 with a jumper wire The horns should sound If the horns sound, go to step 9 If the horns don't sound, repair open in the wire, or replace the cable reel (see «CABLE REEL REPLACEMENT»(/acura/tl/iv-2008-2011/remont/airbag/#srs-supplemental-restraint-system) )
  9. Disconnect the cable reel subharness 20P connector (A)
  10. Check for continuity between terminal (T9) and cable reel subharness 20P connector terminal No 12 There should be continuity If there is continuity, go to step 11 If there is no continuity Open in the wire, replace the cable reel subharness Poor terminal (T9)
  11. Check for continuity between cable reel subharness 20P connector terminal No 11 and horn switch positive terminal 1P There should be continuity If there is continuity, check or adjust the installation of the driver's airbag assembly and the horn switch plate or replace the driver's airbag assembly If there is no continuity, repair open in the wire, or replace the cable reel subharness