Description And Operation: Notes
DESCRIPTION
The horn system includes the following major components:
| 1. | Refer to HORNS - High Tone. |
| 2. | Refer to BODY CONTROL MODULE (BCM) . |
| 3. | Refer to STEERING COLUMN CONTROL MODULE (SCCM) . |
| 4. | Refer to HORN SWITCH . |
| 5. | Refer to HORNS - Low Tone. |
An electrically-operated dual-note horn system is standard factory-installed equipment in this vehicle. The horn system features individual low-note and high-note horn units. The Power Distribution Center (PDC) contains the horn fuse and the horn relay. Pressing either side of the upper surface of the Driver AirBag (DAB) trim cover in the center of the steering wheel actuates the horn switch contacts, which provides the vehicle operator with a convenient, audible signaling device that can be used to alert pedestrians or the operators of other vehicles in close proximity.
OPERATION
The horn operates on battery current received through a fuse, located in the PDC, that is fed through a horn relay located in the PDC, which is soldered to a printed circuit board. The vehicle operator can control typical horn system signaling through the horn switch within the hub of the steering wheel. When the upper surface of the DAB trim cover is pressed, it provides a ground signal sense signal through the SCCM to the BCM. In response to that input, the BCM uses a High Side Driver (HSD) to provide a B(+) path to the coil of the horn relay in the PDC. The horn system circuit is designed so that the system will remain operational, regardless of the status of the ignition switch.
The horns can also be activated by the BCM to support each of the following features:
- Remote Keyless Entry System - Remote Keyless Entry (RKE) system Lock request audible verification.
- Remote Keyless Entry System - RKE system Panic mode audible alert for North America Free Trade Agreement (NAFTA) markets only.
- Remote Start System - Remote Start System Start request audible verification for NAFTA markets only.
- Vehicle Theft Alarm - Vehicle Theft Alarm (VTA) audible alarm except in vehicles manufactured for markets where an alarm siren is required.
The BCM can be programmed to enable or disable horn chirps for door lock and/or remote start requests. The operator has the option of configuring each or these settings in the BCM. Refer to the Owner's Manual for accessing these settings.
The hardwired circuits between components related to the horn system may be diagnosed using conventional diagnostic tools and procedures. Refer to the appropriate wiring information. The wiring information includes wiring diagrams, details of wire harness routing and retention, connector pin-out information and location views for the various wire harness connectors, splices and grounds. For proper wire repair, and connector repair procedures. Refer to STANDARD PROCEDURE . and. Refer to REMOVAL . Refer to INSTALLATION .
However, conventional diagnostic methods will not prove conclusive in the diagnosis of the horn system or the electronic controls and communication between modules and other devices that provide some features of the horn system. The most reliable, efficient and accurate means to diagnose the horn system or the electronic controls and communication related to horn system operation requires the use of a diagnostic scan tool.