Horn Will Not Sound

POSSIBLE CAUSES
- Fused B(+) circuit open
- Horns switch circuit open
- Relay control module
- Clockspring ground circuit open
- Horns

Diagnostic Test




1. TEST THE HORNS

NOTE: Inspect the Horn Fuse 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(+).

Q: Did the Horns sound?

YES: Go to 3
NO: Go to 2




2. MEASURE HORNS CIRCUIT RESISTANCE

Disconnect the Horns harness connectors.

NOTE: Check connectors - Clean/repair as necessary. Install jumper wires into the Horns harness connectors between cavity 1 and cavity 2.

Measure the resistance between cavity 1 of the Relay Control Module harness connector "E" and ground.

Q: Is the resistance below 5.0 ohms?

YES: Replace the Horns. Perform BODY VERIFICATION TEST. Body Verification Test
NO: Repair the Horns circuit for an open. Perform BODY VERIFICATION TEST. Body Verification Test




3. MEASURE HORNS SWITCH CIRCUIT RESISTANCE

WARNING:
- TURN THE IGNITION OFF, DISCONNECT THE BATTERY AND WAIT TWO MINUTES BEFORE PROCEEDING.
- DO NOT PLACE AN INTACT UNDEPLOYED AIRBAG FACE DOWN ON A HARD SURFACE, THE AIRBAG WILL PROPEL INTO THE AIR IF ACCIDENTALLY DEPLOYED, AND COULD RESULT IN SERIOUS OR FATAL INJURY. Disconnect the Driver airbag.

NOTE:
- Check connector - Clean/repair as necessary. Disconnect the Relay Control Module harness connector "D".
- Check connectors - Clean/repair as necessary. Connect a jumper wire between the Horn Switch connector cavities.

Measure the resistance of the Horns Switch circuit between cavity 1 of the Relay Control Module connector "D" and ground.

Q: Is the resistance below 5.0 ohms?

YES: Replace the Relay Control Module. Perform BODY VERIFICATION TEST. Body Verification Test
NO: Go to 4




4. MEASURE HORNS SWITCH CIRCUIT RESISTANCE

WARNING:
- TURN THE IGNITION OFF, DISCONNECT THE BATTERY AND WAIT TWO MINUTES BEFORE PROCEEDING.
- DO NOT PLACE AN INTACT UNDEPLOYED AIRBAG FACE DOWN ON A HARD SURFACE, THE AIRBAG WILL PROPEL INTO THE AIR IF ACCIDENTALLY DEPLOYED, AND COULD RESULT IN SERIOUS OR FATAL INJURY. Disconnect the Clockspring harness connector.

NOTE: Check connector - Clean/repair as necessary. Connect a jumper wire between cavities 1 and 2 of the Clockspring harness connector.

Measure the resistance of the Horns Switch circuit between cavity 1 of the Relay Control Module connector "D" and ground.

Q: Is the resistance below 5.0 ohms?

YES: Replace the Clockspring. Perform BODY VERIFICATION TEST. Body Verification Test
NO: Repair the Horns Switch circuit for an open. Perform BODY VERIFICATION TEST. Body Verification Test