Horns Inoperative

*HORNS INOPERATIVE









For a complete Horn Circuit Diagram, Schematics and Diagrams.

Diagnostic Test

1. TEST THE HORNS




NOTE: Inspect the Horn Fuse (F6) located in the Relay Control Module. If the fuse is open, repair the cause of the open fuse before continuing.

Turn the ignition off.
Disconnect the Relay Control Module connector "E".

NOTE: Check connectors - Clean/repair as necessary.

Connect a fused jumper wire from cavity 1 of the Relay Control Module connector "E" to B(+).
Did the Horns sound?

Yes

- Go to 4

No

- Go to 2

2. MEASURE THE HORN CIRCUIT RESISTANCE




Disconnect the left Horn harness connector (Horn No.2).

NOTE: Check connectors - Clean/repair as necessary.

Measure the resistance between cavity 1 of the Relay Control Module harness connector "E" and the left Horn harness connector (Horn No.2).
Is the resistance below 5.0 ohms?

Yes

- Go to 3

No

- Repair the Horn circuit for an open.
- Perform BODY VERIFICATION TEST. Body Verification Test

3. MEASURE THE HORN GROUND CIRCUIT RESISTANCE




Disconnect the Ground circuit harness connector at the Horn.

NOTE: Check connectors - Clean/repair as necessary.

Measure the resistance of the Ground circuit between the Horn harness connector and ground.
Is the resistance below 5.0 ohms?

Yes

- Replace the Horn(s). Removal.
- Perform BODY VERIFICATION TEST. Body Verification Test

No

- Repair the Horn Ground circuit for an open.
- Perform BODY VERIFICATION TEST. Body Verification Test

4. MEASURE THE HORN SWITCH CIRCUIT RESISTANCE




Disconnect the Relay Control Module harness connector "D".

NOTE: Check connectors - Clean/repair as necessary.

Measure the resistance of the Horn Switch circuit between cavity 1 of the Relay Control Module connector "D" and ground.
Press the horn pad while observing the meter.
Is the resistance below 5.0 ohms when the horn is pressed?

Yes

- Replace the Relay Control Module. Removal.
- Perform BODY VERIFICATION TEST. Body Verification Test

No

- Repair the Horn Switch circuit for an open.
- Perform BODY VERIFICATION TEST. Body Verification Test