Scheme 1
| Item | Description |
|---|---|
| 1 | Horn Comments: Located behind lower engine cover |
Overview
The horn output is controlled by the Body Control Module (BCM). The Body Control Module (BCM) energizes the horn relay, sounding the horn.
Scheme 2
Horn Operation
The horn switch consists of 2 sets of contacts separated by springs. The lower set is connected to ground and the upper set is connected to the horn signal circuit. When the driver airbag is pressed, it pushes down on the upper set of contacts, collapsing the springs and allowing the contacts to touch. When the contacts touch, it completes the circuit and provides the ground signal, which is routed through the clockspring to the Body Control Module (BCM). The Body Control Module (BCM) grounds the horn relay coil to energize the relay. When energized, the horn relay provides voltage to the horn, enabling the horn to sound.
Normal Operation and Fault Conditions
Refer to: Horn - System Operation and Component Description .
| DTC | Description | Fault Trigger Condition |
|---|---|---|
| B1C55:13 | Horn Relay: Circuit Open | A Continuous Memory Diagnostic Trouble Code (CMDTC) that sets when the BCM detects an open on the horn relay control circuit. |
| B1C55:19 | Horn Relay: Circuit Current Above Threshold | A Continuous Memory Diagnostic Trouble Code (CMDTC) that sets when the BCM detects a high current condition on the horn relay control circuit. The BCM disables the horn when this DTC is set. |
DTC CHART
Refer to: Horn - System Operation and Component Description .
| 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. |
| B1323:23 | Horn Switch: Signal Stuck Low | An on-demand DTC that sets when the BCM detects a short to ground on the horn signal circuit. |
| B1C55:11 | Horn Relay: Circuit Short to Ground | A Continuous Memory Diagnostic Trouble Code (CMDTC) that sets when the BCM detects a short to ground on the horn relay control circuit. |
DTC CHART
See also:
• DRIVER AIRBAG
• JACKING AND LIFTING - OVERVIEW