Yes | REPAIR the circuit. |
|---|---|
No | GO to A7 |
A7 CHECK THE HORN RELAY CONTROL CIRCUIT FOR AN OPEN
Ignition OFF. Measure:
Click to display connectors
Positive Lead | Measurement / Action | Negative Lead |
|---|---|---|
Horn relay pin socket 2 | C2280F-20 |
Is the resistance less than 3 ohms?
Yes | GO to A16 |
|---|---|
No | REPAIR the circuit. |
A8 CHECK THE HORN POWER SUPPLY CIRCUIT
NOTICE: The following step uses a test light to simulate normal circuit loads. Use only a Rotunda Test Lamp (SGT27000) or 250-300mA incandescent bulb test lamp. To avoid connector terminal damage, use the Rotunda Flex Probe kit for the test lamp probe connection to the vehicle. Do not use the test lamp probe directly on any connector. For C131, connect:
Click to display connectors
Positive Lead | Measurement / Action | Negative Lead |
|---|---|---|
C131-2 | Ground |
For C1102, connect:
Click to display connectors
Positive Lead | Measurement / Action | Negative Lead |
|---|---|---|
C1102-2 | Ground |
Momentarily connect a fused jumper wire:
Positive Lead | Measurement / Action | Negative Lead |
|---|---|---|
Horn relay pin socket 3 | Horn relay pin socket 5 |
Does the test light momentarily illuminate?
Yes | REPAIR the horn ground circuit. |
|---|---|
No | REPAIR the horn power supply circuit. |
A9 CHECK THE HORN SWITCH INPUT TO THE BCM (BODY CONTROL MODULE)
Ignition OFF. Disconnect BCM C2280B. While pressing the horn, measure:
2016 Mustang workshop publication supplied to Mustang Atlas. Original technical text and illustrations; HTML formatting by Mustang Atlas. Source page numbering is retained for traceability. Follow the configuration, revision, warnings, and cross-references in the material. About this edition.