Parking assistance diagnostics and testing (Discovery 3)

Inspection and verification

1. Ensure that the customer's complaint is justified.

2. Visually inspect for obvious mechanical and electrical problems.

3. Make sure there is no dirt on the sensor surface that may interfere with its operation.

Mechanical factors	Electrical factors
Sensor status and installation Speaker(s) Switch	Fuses Central electrical distribution box (CJB) - fuse 36P Battery electrical distribution box (BJB) - fuse 11E Wiring harnesses and electrical connectors Sensors Parking assistance switch Parking assistance module

4. If an obvious cause for the problem you identified or the customer described is found, resolve it before moving on to further action. (if possible).

5. Use the approved diagnostic system or scan tool to retrieve all diagnostic trouble codes (DTCs) before performing the self-test or DTC index.

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Clear all DTCs after troubleshooting.

On-board self-test

Self-testing, which is an element of the system strategy, informs the driver of any malfunctions using LEDs and sound signals:

• The system status LED flashes when the system is active and a fault is detected in the sensors, speakers, wiring, or module.
• If a malfunction is detected in the rear speaker, an error signal will sound from the front speaker for three seconds.
• If a malfunction is detected in the rear sensors, the switch built into the LED switch, or in the event of a CAN bus signal transmission error, an error signal will sound from the rear speaker for three seconds.

DTC Index

NOTE: Generic scan tools cannot read the codes listed or can only read 5-digit codes. Match the 5 digits from the scan tool with the first 5 digits of the listed 7-digit code to identify the fault. (the last 2 digits provide additional information readable by a manufacturer approved diagnostic system).

DTC	Description	Possible reasons	Action
B1A0049	Control module	Internal electronic malfunction	Check the module's power and ground circuits. Refer to the electrical manual. If the module is suspect, refer to the warranty policy and procedures manual.
B1B3601	Right frontmost sensor	Electrical signal circuit: short circuit to ground Signal circuit: high resistance Problem with connector/wiring harness	Refer to the electrical manual and check the sensor circuit. Check the connector for continuity and damage. Refer to the guided diagnostic program for this code on the approved diagnostic system.
B1B3696	Right frontmost sensor	Internal element failure	Refer to the guided diagnostic program for this code on the approved diagnostic system.
B1B3801	Right inner front sensor	Electrical signal circuit: short circuit to ground Signal circuit: high resistance Problem with connector/wiring harness	Refer to the electrical manual and check the sensor circuit. Check the connector for continuity and damage. Refer to the guided diagnostic program for this code on the approved diagnostic system.
B1B3896	Right inner front sensor	Internal element failure	Refer to the guided diagnostic program for this code on the approved diagnostic system.
B1B4001	Left outer front sensor	Electrical signal circuit: short circuit to ground Signal circuit: high resistance Problem with connector/wiring harness	Refer to the electrical manual and check the sensor circuit. Check the connector for continuity and damage. Refer to the guided diagnostic program for this code on the approved diagnostic system.
B1B4096	Left outer front sensor	Internal element failure	Refer to the guided diagnostic program for this code on the approved diagnostic system.
B1B4201	Left inner front sensor	Electrical signal circuit: short circuit to ground Signal circuit: high resistance Problem with connector/wiring harness	Refer to the electrical manual and check the sensor circuit. Check the connector for continuity and damage. Refer to the guided diagnostic program for this code on the approved diagnostic system.
B1B4296	Left inner front sensor	Internal element failure	Refer to the guided diagnostic program for this code on the approved diagnostic system.
B1B4401	Right rearmost sensor	Electrical signal circuit: short circuit to ground Signal circuit: high resistance Problem with connector/wiring harness	Refer to the electrical manual and check the sensor circuit. Check the connector for continuity and damage. Refer to the guided diagnostic program for this code on the approved diagnostic system.
B1B4496	Right rearmost sensor	Internal element failure	Refer to the guided diagnostic program for this code on the approved diagnostic system.
B1B4601	Right inner rear sensor	Electrical signal circuit: short circuit to ground Signal circuit: high resistance Problem with connector/wiring harness	Refer to the electrical guide and check the sensor circuit. Check the connector for continuity and damage. Refer to the guided diagnostic program for this code on the approved diagnostic system.
B1B4696	Right inner rear sensor	Internal element failure	Refer to the guided diagnostic program for this code on the approved diagnostic system.
B1B4801	Left rearmost sensor	Electrical signal circuit: short circuit to ground Signal circuit: high resistance Problem with connector/wiring harness	Refer to the electrical manual and check the sensor circuit. Check the connector for continuity and damage. Refer to the guided diagnostic program for this code on the approved diagnostic system.
B1B4896	Left rearmost sensor	Internal element failure	Refer to the guided diagnostic program for this code on the approved diagnostic system.
B1B5001	Left inner rear sensor	Electrical signal circuit: short circuit to ground Signal circuit: high resistance Problem with connector/wiring harness	Refer to the electrical manual and check the sensor circuit. Check the connector for continuity and damage. Refer to the guided diagnostic program for this code on the approved diagnostic system.
B1B5096	Left inner rear sensor	Internal element failure	Refer to the guided diagnostic program for this code on the approved diagnostic system.
B1B5212	Rear speaker	Rear Speaker Circuit Short to Battery Voltage Problem with connector/wiring harness	Refer to the electrical manual and check the sensor circuit. Check the connector for continuity and damage. Refer to the guided diagnostic program for this code on the approved diagnostic system.
B1B5296	Rear speaker	Internal element failure	Refer to the guided diagnostic program for this code on the approved diagnostic system.
B1B5401	Operation mode LED	LED electrical circuit: short circuit to battery + Problem with connector/wiring harness	Refer to the electrical manual and check the LED circuit. Check the connector for continuity and damage. Refer to the guided diagnostic program for this code on the approved diagnostic system.
B1B5711	Front Sensor Power Supply Circuit	Front Sensor Power Circuit Short to Ground Problem with connector/wiring harness	Refer to the electrical manual and check the sensor circuit. Check the connector for continuity and damage. Refer to the guided diagnostic program for this code on the approved diagnostic system.
B1B5811	Electrical power supply circuit for rear sensors	Rear Sensor Power Circuit Short to Ground Problem with connector/wiring harness	Refer to the electrical manual and check the sensor circuit. Check the connector for continuity and damage. Refer to the guided diagnostic program for this code on the approved diagnostic system.
B1C3073	System shutdown switch	Jamming of actuator in closed position	Check the operation of the switch. Refer to the electrical equipment manual.
U007388	Control module data bus "A" shutdown	The bus is disconnected	Check the CAN electrical circuits. Refer to the electrical equipment manual.
U014087	Lost Communication with Body Control Module	No message	Refer to the "Network Communication" section in the service station manual.
U015587	Lost Communication with Instrument Panel Control (IPC) Module	No message	Refer to the "Network Communication" section in the service station manual.
U030055	Internal control module software incompatibility	Configuration not configured	Configure the module using an approved diagnostic system.