Principles of Operation
The parking aid sensors detect objects approximately 152 cm (60 in) from the rear of the vehicle, 50 cm (20 in) from the rear side of the vehicle, and 30 cm (12 in) above the ground. The Parking Aid Module (PAM) calculates the distance to an object within the 170 degree semicircular area around the rear of the vehicle.
A variable-rate warning tone is generated from a speaker attached to the PAM. The speaker increases its warning tone rate as the vehicle gets closer to an obstacle. When an object is detected within 30 cm (12 in) of the sensors, the warning tone becomes continuous. When the PAM sounds the parking aid tone, it sends a volume cutback enabled message over the High Speed Controller Area Network (HS-CAN) to the Instrument Panel Cluster (IPC). The IPC sends a message over the Medium Speed Controller Area Network (MS-CAN) to the Audio Control Module (ACM). When the ACM receives the message, it reduces the speaker output so the parking aid tone can be heard.
The parking aid system is enabled 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 Instrument Panel Cluster (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.
The PAM communicates on the HS-CAN and can be diagnosed with a scan tool. The PAM communicates with the scan tool, the Body Control Module (BCM), and the IPC.
Normal Operation
The parking aid system is enabled when the ignition switch is in the RUN position and the reverse gear is selected. The Parking Aid Module (PAM) receives reverse gear input from the PCM through the High Speed Controller Area Network (HS-CAN). A reference voltage and signal return is supplied to the parking aid sensors from the PAM. The PAM receives an input signal from each individual parking aid sensor. The system can be disabled through the message center in the Instrument Panel Cluster (IPC).
Note. 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.
This pinpoint test is intended to diagnose the following
- Wiring, terminals or connectors
- Parking aid sensors alignment
- PAM
- Rear bumper cover
The Parking Aid Module (PAM) supplies a reference voltage and signal return to the parking aid sensors. A fault condition occurs when the PAM detects an open in the parking aid sensor circuits or the parking aid sensor input signal is open or shorted to ground.
| DTC Description | Fault Trigger Conditions |
|---|---|
| B1B44:14 - Right Rear Outer Sensor: Circuit Short To Ground Or Open | A continuous and on-demand DTC that sets when any of the right rear outer parking aid sensor circuits are open or the sensor signal line is shorted to ground. |
| B1B46:14 - Right Rear Inner Sensor: Circuit Short To Ground Or Open | A continuous and on-demand DTC that sets when any of the right rear inner parking aid sensor circuits are open or the sensor signal line is shorted to ground. |
| B1B48:14 - Left Rear Outer Sensor: Circuit Short To Ground Or Open | A continuous and on-demand DTC that sets when any of the left rear outer parking aid sensor circuits are open or the sensor signal line is shorted to ground. |
| B1B50:14 - Left Rear Inner Sensor: Circuit Short To Ground Or Open | A continuous and on-demand DTC that sets when any of the left rear inner parking aid sensor circuits are open or the sensor signal line is shorted to ground. |
DTC FAULT TRIGGER CONDITIONS
This pinpoint test is intended to diagnose the following
- Wiring, terminals or connectors
- Parking aid sensor(s)
- Parking aid sensor harness
- PAM
The Parking Aid Module (PAM) supplies a reference voltage and signal return to the parking aid sensors. A fault condition occurs when the PAM detects a short to voltage on the parking aid sensor signal circuit.
| DTC Description | Fault Trigger Conditions |
|---|---|
| B1B44:12 - Right Rear Outer Sensor: Circuit Short To Battery | A continuous and on-demand DTC that sets when the right rear outer parking aid sensor signal line is shorted to battery voltage. |
| B1B46:12 - Right Rear Inner Sensor: Circuit Short To Battery | A continuous and on-demand DTC that sets when the right rear inner parking aid sensor signal line is shorted to battery voltage. |
| B1B48:12 - Left Rear Outer Sensor: Circuit Short To Battery | A continuous and on-demand DTC that sets when the left rear outer parking aid sensor signal line is shorted to battery voltage. |
| B1B50:12 - Left Rear Inner Sensor: Circuit Short To Battery | A continuous and on-demand DTC that sets when the left rear inner parking aid sensor signal line is shorted to battery voltage. |
DTC FAULT TRIGGER CONDITIONS
This pinpoint test is intended to diagnose the following
- Wiring, terminals or connectors
- Parking aid sensor(s)
- Parking aid bumper harness
- PAM
The Parking Aid Module (PAM) calculates the distance to an object using 4 ultrasonic sensors mounted in the rear bumper. The parking aid sensors can detect obstructions in the path behind the vehicle.
The attenuation time for the rear parking aid sensors is the time required for a sensor to detect the distance to an object expressed in milliseconds (ms). A fault condition occurs when the signal or the attenuation time is out of normal range.
| DTC Description | Fault Trigger Conditions |
|---|---|
| B1B44:96 - Right Rear Outer Sensor: Component Internal Failure | A continuous and on-demand DTC that sets when the right rear outer parking aid sensor has internally failed or has an incorrect attenuation time. |
| B1B46:96 - Right Rear Inner Sensor: Component Internal Failure | A continuous and on-demand DTC that sets when the right rear inner parking aid sensor has internally failed or has an incorrect attenuation time. |
| B1B48:96 - Left Rear Outer Sensor: Component Internal Failure | A continuous and on-demand DTC that sets when the left rear outer parking aid sensor has internally failed or has an incorrect attenuation time. |
| B1B50:96 - Left Rear Inner Sensor: Component Internal Failure | A continuous and on-demand DTC that sets when the left rear inner parking aid sensor has internally failed or has an incorrect attenuation time. |
DTC FAULT TRIGGER CONDITIONS
This pinpoint test is intended to diagnose the following
- Dirty or obstructed parking aid sensor
- Parking aid sensor
- PAM
The Parking Aid Module (PAM) supplies a reference voltage and signal return to the parking aid sensors. A fault condition occurs when the PAM detects a short to ground or signal return circuit on the parking aid sensor voltage supply circuit.
- DTC B1B58:11 (Rear Sensors Power Circuit: Circuit Short to Ground) - sets when the sensor voltage supply circuit is shorted to ground or to the signal return circuit.
This pinpoint test is intended to diagnose the following
- Wiring, terminals or connectors
- Parking aid sensor(s)
- Parking aid bumper harness
- PAM
When the parking aid sensors detect obstructions in the path behind the vehicle, a variable rate warning tone is generated from the parking aid speaker. The parking aid speaker increases the warning tone rate as the vehicle gets closer to an obstacle. A fault condition occurs when the Parking Aid Module (PAM) detects an open, short to ground or short to voltage on the parking aid speaker circuits.
- DTC B1B52:12 (Rear Sounder-Park Aid: Circuit Short To Battery) - sets when the sounder circuit is shorted to voltage.
- DTC B1B52:14 (Rear Sounder-Park Aid: Circuit Short To Ground Or Open) - sets when the sounder circuit is open or shorted to ground.
This pinpoint test is intended to diagnose the following
- Wiring, terminals or connectors
- PAM
- Parking aid speaker
Note. The luggage compartment lid must be closed for correct operation of the video camera system.
Note. The Smart Junction Box (SJB) is also known as the Generic Electronic Module (GEM).
The rear video camera system is used to assist the driver while reversing or parking the vehicle. For vehicles without navigation, the image of the area behind the vehicle is displayed in the LH side of the auto-dimming interior mirror. For vehicles with navigation, the image of the area behind the vehicle is displayed in the Front Display Interface Module (FDIM). A dashed line on the displayed image represents the center of the vehicle and 3 color-coded lines (red, yellow, green) identify different zones between the rear of the vehicle and objects located behind the vehicle.
Note. The color-coded lines may not indicate accurate or consistent distances between objects located behind the vehicle and the rear of the vehicle. This normal condition is due to variances in vehicle ride height, including, but not limited to, vehicle loading. The color coded lines and center line, if available, can appear to be off center or misaligned from the target. This is due to the placement of the video camera being off centered to the rear of the vehicle. The lines are designed to guide the driver to the correct target even if they appeared not centered.
For vehicles without navigation, the signal from the rear video camera is sent to the auto-dimming interior mirror display on a pair of shielded video circuits. For vehicles with navigation, the signal from the rear video camera is sent to the FDIM on a pair of shielded video circuits. The displayed video image is horizontally inverted from that viewed from the video camera perspective to mimic a conventional mirror image. The rear video camera system is active with the ignition in RUN and the transmission selector in the REVERSE (R) position.
For vehicles without navigation, the system remains active for approximately 3 seconds after the transmission selector is moved from the REVERSE (R) position. The rear video camera system cannot be disabled during these conditions.
For vehicles with navigation, the video system has a delay feature that keeps the image displayed on the FDIM until the vehicle reaches 8 km/h (5 mph) and the vehicle is shifted out of REVERSE (R). The operator has the ability to turn the delay feature on or off with the on screen options in the FDIM. The image is not displayed if the vehicle is shifted into PARK (P).
For vehicles without navigation, with the gear selector in the REVERSE (R) position, a reverse voltage signal is sent to the auto-dimming interior mirror supplying power to the display in the mirror. The video camera signal is sent to the auto-dimming interior mirror. The video signal from the video camera displays an image on the LH side of the auto-dimming interior mirror.
For vehicles with navigation, with the gear selector in the REVERSE (R) position, a reverse signal is sent from the Instrument Panel Cluster (IPC) to the Audio Control Module (ACM) over the Medium Speed Controller Area Network (MS-CAN), enabling the system. The video signal from the video camera displays an image on the Front Display Interface Module (FDIM).
This pinpoint test is intended to diagnose the following
- Fuse
- Wiring, terminals or connectors
- Video camera
- Auto-dimming interior mirror (without navigation)
- FDIM (with navigation)
For vehicles without navigation, with the gear selector in the REVERSE (R) position, a reverse voltage signal is sent to the auto-dimming interior mirror supplying power to the display in the mirror. The video camera signal is sent to the auto-dimming interior mirror. A pair of shielded wires carries the video signal from the video camera and displays an image on the LH side of the auto-dimming interior mirror.
For vehicles with navigation, with the gear selector in the REVERSE (R) position, a reverse signal is sent from the Instrument Panel Cluster (IPC) to the Audio Control Module (ACM) over the Medium Speed Controller Area Network (MS-CAN), enabling the system. A pair of shielded wires carries the video signal from the video camera and displays an image on the Front Display Interface Module (FDIM).
This pinpoint test is intended to diagnose the following
- Wiring, terminals or connectors
- Video camera
- Auto-dimming interior mirror (without navigation)
- FDIM (with navigation)
The video camera receives a supply voltage with the ignition switch in the RUN position. When the gear selector is in the REVERSE (R) position, a reverse voltage signal is sent to the auto-dimming interior mirror supplying power to the display in the mirror. The video camera signal is sent to the auto-dimming interior mirror. The video signal from the video camera displays an image on the LH side of the auto-dimming interior mirror.
This pinpoint test is intended to diagnose the following
- Wiring, terminals or connectors
- Auto-dimming interior mirror