System Operation
System Diagram
Network Message Chart
Module Network Input Messages -- PAM
| Broadcast Message | Originating Module | Message Purpose |
|---|---|---|
| Ignition status | BCM | Used as a redundant input to confirm the ignition switch position. |
| Ambient air temperature | BCM | Used to temperature compensate the parking aid sensor inputs. |
| Parking aid enable status | IPC | Used to enable or disable the parking aid. |
| Selector lever (PRNDL) status | PCM | Used to enable the parking aid when the transmission selector is in reverse. |
| Wheel speed data | ABS module | Used to disable the parking aid if the vehicle speed exceeds a preset threshold. |
Module Network Input Messages -- IPC
| Broadcast Message | Originating Module | Message Purpose |
|---|---|---|
| Parking aid warning status | PAM | Used to reduce the audio output from the audio system so a parking aid speaker chime can be heard. |
Module Network Input Messages -- ACM
| Broadcast Message | Originating Module | Message Purpose |
|---|---|---|
| Audio mute | IPC | Used to reduce the audio output from the audio system so a parking aid speaker chime can be heard. |
Module Network Input Messages -- Audio DSP Module with Sony® Sound
| Broadcast Message | Originating Module | Message Purpose |
|---|---|---|
| Audio mute | IPC | Used to reduce the audio output from the audio system so a parking aid speaker chime can be heard. |
Parking Aid System Operation
The parking aid system calculates the distance to an object around the rear of the vehicle using 4 ultrasonic sensors. The parking aid sensors detect objects approximately 1, 524 mm (60 in) from the rear of the vehicle, 508 mm (20 in) from the rear side of the vehicle, and 304.8 mm (12 in) above the ground.
The PAM calculates the distance to an object within the 170 degree semicircular (azimuth) area around the rear of the vehicle. A variable-rate warning tone is generated from a speaker attached to the PAM.
The PAM can be diagnosed with a scan tool.
Parking Aid Audible Alert
The speaker increases its warning tone rate as the vehicle gets closer to an obstacle. When an object is detected within 304.8 mm (12 in) of the sensors, the warning tone becomes continuous.
When the PAM sounds the parking aid tone, it sends an audio volume cutback message to the IPC which sends a message over the to the ACM. When the ACM receives the message, it reduces the speaker output so the parking aid tone can be heard. If the vehicle is equipped with Sony® sound the audio DSP module reduces the speaker output.