Parking Aid - Audible: Notes
Component Location
Component Location
| Item | Description | Comments |
|---|---|---|
| 1 | Parking aid speaker | - |
| 2 | PAM | - |
| 3 | Parking aid sensor | - |
Overview
The parking aid system sounds a warning to alert the driver of stationary objects near the rear bumper when REVERSE is selected. The rear sensors are activated when REVERSE is selected. The parking aid system assists the driver in detecting certain objects while the vehicle moves slowly in REVERSE at speeds of less than 4.8 kmh (3 mph). The parking aid system may not detect moving objects.
The parking aid system is active when the ignition switch is in the RUN position and the transmission in REVERSE. The parking aid system is disabled if a fault is detected in 1 of the 4 sensors, the parking aid speaker, or the PAM. This is indicated by a parking aid disabled warning message in the message center.
The parking aid system is enabled and disabled through the message center, located in the IPC.
If a MyKey ® restricted key is in the ignition cylinder, the parking aid menu is not available in the message center and cannot be deactivated.
System Operation
System Diagram
Network Message Chart
PAM Network Input Messages
| Broadcast Message | Originating Module | Message Purpose |
|---|---|---|
| Ignition status | BCM | Used as a redundant input to confirm the ignition switch position. |
| Outside 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 TCM | 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. |
IPC Network Input Messages
| Broadcast Message | Originating Module | Message Purpose |
|---|---|---|
| Audio volume cutback | PAM | 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 to the ACM. When the ACM receives the message, it reduces the speaker output so the parking aid tone can be heard.