Pinpoint Test 1: The Horn Is Inoperative

PINPOINT TEST 1: THE HORN IS INOPERATIVE

Normal Operation

The horn relay control voltage and the horn relay switched voltage circuits are supplied by the smart junction box (SJB) fuse 13 (15A) through circuit (GY/R). The horn relay (part of the SJB) is controlled by circuit (Y/R) through the clockspring to the horn switch (part of the steering wheel). When the horn switch is pressed, the horn relay control circuit (Y/R) is grounded through the clockspring and circuit (B/W). The horn relay is then energized causing voltage to be applied to circuit (L/W), enabling the horn to sound. Ground to the horn is supplied through circuit (B/GY).

This pinpoint test is intended to diagnose the following:
- Fuse(s)
- Wiring, terminals or connectors
- Horn
- Clockspring
- Horn switch (part of the steering wheel)
- SJB

CAUTION:Use the correct probe adapter(s) when making measurements. Failure to use the correct probe adapter(s) may damage the connector.

Step 1-Step 5:

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