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VTSS Test 4A - Horn Circuits

NOTE: Perform VTSS TEST 1A before proceeding with this test. For connector terminal identification and wiring diagrams, see CONNECTOR IDENTIFICATION in appropriate BODY CONTROL COMPUTER section in this article. For wiring diagrams, see WIRING DIAGRAMS at the end of article. Perform TEST VER-1A after each repair.
CAUTION: Always turn ignition switch to OFF position prior to disconnecting or connecting any module connector.
  1. Depress horn button on steering wheel. If horn sounds, go to next step. If horn does not sound, go to step 4).
  2. Using scan tool, read trunk key cylinder switch status. If scan tool displays SWITCH: CLOSED, go to next step. If scan tool does not display SWITCH: CLOSED, go to VTSS TEST 4C.
  3. Turn ignition off. Remove BCM from junction block and ensure connectors are clean and not damaged. Using external voltmeter, check voltage on BCM 12-pin connector terminal No. 7. See Figure in CHIME TEST 3A. If voltage is 10 volts or less, replace junction block. If voltage is greater than 10 volts, replace BCM.
  4. Remove horn relay located in junction block. See Figure in CHIME TEST 3A. Using external voltmeter, probe horn relay cavity No. 8. If voltage is greater than 10 volts, go to next step. If voltage is less than 10 volts, go to VTSS TEST 4B.
  5. Using external voltmeter, probe horn relay cavity No. 6. See Figure in CHIME TEST 3A. If voltage is greater than 10 volts, go to next step. If voltage is 10 volts or less, replace junction block.
  6. Connect a jumper wire between horn relay cavity No. 8 and cavity No. 10. See Figure in CHIME TEST 3A. If horns sound, go to next step. If horns do not sound, repair open in Dark Green/Pink wire between junction block and horn(s).
  7. Turn ignition off. Remove BCM from junction block and ensure connectors are clean and not damaged. Using external ohmmeter, check resistance between BCM 12-pin connector terminal No. 7 and horn relay cavity No. 7. See Figure in CHIME TEST 3A. If resistance is less than 5 ohms, reinstall horn relay and go to next step. If resistance is 5 ohms or greater, replace junction block.
  8. Using external voltmeter, check voltage on BCM 12-pin connector terminal No. 7. If voltage is 10 volts or less, replace horn relay. If voltage is greater than 10 volts, replace BCM.
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