Normal Operation and Fault Conditions
DTC Chart
DTC | Description | Fault Trigger Condition |
|---|---|---|
B1323:11 | Horn Switch: Circuit Short to Ground | A Continuous Memory Diagnostic Trouble Code (CMDTC) that sets when the BCM detects a short to ground on the horn signal circuit. |
B1C55:14 Horn Relay: Circuit Short to Ground or Open | This DTC sets when the BCM detects a short to ground or an open on the horn relay control circuit. |
Possible Sources
Wiring, terminals or connectors Clockspring Horn relay Horn switch BCM
PINPOINT TEST B : THE HORN IS ALWAYS ON
NOTICE: Use the correct probe adapter(s) when making measurements. Failure to use the correct probe adapter(s) may damage the connector.
NOTICE: The following test 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.
B1 ISOLATE THE HORN RELAY
Disconnect Horn C131 or C1102. For C131, connect:
Click to display connectors
Positive Lead | Measurement / Action | Negative Lead |
|---|---|---|
C131-1 | C131-2 |
For C1102, connect:
Click to display connectors
Positive Lead | Measurement / Action | Negative Lead |
|---|---|---|
C1102-1 | C1102-2 |
Remove the horn relay.
Does the test light remain illuminated?
Yes | REPAIR the short to voltage on the horn voltage supply circuit. |
|---|---|
No | GO to B2 |
B2 CHECK THE HORN RELAY
Ignition OFF. Remove the horn relay and install a known-good relay in its place. Test the horn for normal operation.
Does the horn operate correctly?
Yes | GO to B3 |
|---|---|
No | INSTALL a new horn relay. |
B3 ISOLATE THE BCM (BODY CONTROL MODULE) HORN SWITCH INPUT CIRCUIT
Ignition ON. Connect a diagnostic scan tool. Using a diagnostic scan tool, view BCM Paramater Identifications (PIDs). Monitor the BCM HORN_SW PID.
Does the PID status display OFF?
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.