Horn Relay: Testing and Inspection

1. Remove horn relay (Refer to HORN/HORN RELAY - REMOVAL).

Fig. 2 Horn Relay:

2. Using ohmmeter, test between relay connector terminals 85 to 86 for 75 ± 8 ohms resistance. If resistance not OK, replace relay.
3. Test for continuity between ground and terminal 85 of horn relay
a. When the horn switch is not depressed, no continuity should be present.
b. Continuity to ground when horn switch is depressed.
c. If continuity is not correct replace horn switch or wiring as necessary, refer to the appropriate wiring information. The wiring information includes wiring diagrams, proper wire and connector repair procedures, details of wire harness routing and retention, connector pin-out information and location views for the various wire harness connectors, splices and grounds.

4. Using voltmeter, test voltage at:
a. Terminals 30 and 86 of the horn relay to body ground.
b. If NO voltage check fuse 3 of the Junction Block (JB).
c. If incorrect voltage, repair as necessary. Refer to the appropriate wiring information. The wiring information includes wiring diagrams, proper wire and connector repair procedures, details of wire harness routing and retention, connector pin-out information and location views for the various wire harness connectors, splices and grounds.

5. Insert a jumper wire between terminal 30 and 87 of the Junction Block (JB).
a. If horn sounds replace relay.
b. If the horn does not sound, install horn relay and test horn (Refer to HORN/HORN - DIAGNOSIS AND TESTING).