Land Rover Discovery: Parking Aid / Diagnosis and Testing

PRINCIPLES OF OPERATION

For a detailed description of the Parking Aid system, refer to the relevant Description and Operation section in the workshop manual. REFER to: Parking Aid (413-13 Parking Aid, Description and Operation).

INSPECTION AND VERIFICATION

CAUTION:

Diagnosis by substitution from a donor vehicle is NOT acceptable.

Substitution of control modules does not guarantee confirmation of a fault, and may also cause additional faults in the vehicle being tested and/or the donor vehicle.

NOTES:

• If a control module or a component is suspect and the vehicle remains under manufacturer warranty, refer to the Warranty Policy and Procedures manual, or determine if any prior approval programme is in operation, prior to the installation of a new module/component.
• When performing voltage or resistance tests, always use a digital multimeter that has the resolution ability to view 3 decimal places.

  For example, on the 2 volts range can measure 1mV or 2 K Ohm range can measure 1 Ohm. When testing resistance always take the resistance of the digital multimeter leads into account.

• Check and rectify basic faults before beginning diagnostic routines involving pinpoint tests.
• Ensure that the parking aid sensor face is clear of contamination that could affect the performance of the sensor.

1. Verify the customer concern
2. Visually inspect for obvious signs of damage and system integrity

Visual Inspection

3. If an obvious cause for an observed or reported concern is found, correct the cause (if possible) before proceeding to the next step
4. If the cause is not visually evident, verify the symptom and refer to the Symptom Chart, alternatively check for Diagnostic Trouble Codes (DTCs) and refer to the DTC Index
5. Check DDW for open campaigns. Refer to the corresponding bulletins and SSMs which may be valid for the specific customer complaint and carry out the recommendations as required

SYMPTOM CHART

CAUTION:

Do not apply any grease based products to any parking aid system connector or terminals.

NOTES:

• Please note if this diagnosis is being carried out on a vehicle without a hard wired parking aid speaker, ensure the in car infotainment system is fully functional and configured correctly.
• Parking aid sensors that are painted incorrectly and not to the manufacturer standards, will not be considered in any warranty claim.

SYMPTOM:

Parking aid system not functioning correctly (no DTCs set)

POSSIBLE CAUSE:

• Front/rear parking aid sensor(s) dirty
• Front/rear parking aid sensor positions incorrect
• Front/rear parking aid sensor(s) incorrectly installed
• Front/rear parking aid sensor coupling rings not installed or incorrectly installed
• Parking aid sensors painted without being removed from the bumper assembly or not painted to the manufacturer specification

ACTION:

• Clean the front and rear parking aid sensors
• Check the front and rear parking aid sensor positions
• Check the installation of the front and rear parking aid sensors
• Check the installation of the front and rear parking aid sensor coupling rings
• Remove parking aid sensor and ensure correctly painted parking aid sensor is installed

• Parking aid sensors that are painted incorrectly and not to the manufacturer standards, will not be considered in any warranty claim

SYMPTOM:

Parking aid system not functioning correctly (no DTCs set) - System characteristics or environmental effects

POSSIBLE CAUSE:

• Parking aid sensors incorrectly mounted
• Incorrect vehicle ride height
• Dirty parking aid sensor face.

  Ice/snow covered sensor. Debris trapped between parking aid sensor and parking aid sensor body.

  Heavy rain or water splash from the ground

• Non standard, bumper, exhausts/tailpipes, tow bar or external spare wheel mounting
• Area around vehicle is not clear of obstacles such as channels, gutters or other items on the ground
• Exhaust gas and warm air clouds creating ghost echoes
• Vehicle not on level ground or next to a gradient
• Parking aid sensors painted without being removed from the bumper assembly or not painted to the manufacturer specification

ACTION:

• Ensure the sensors are a tight fit in the holder and locked. Ensure the sensors are central in the holder and bumper and at the correct angle
• Ensure vehicle ride height is within the specified limits. Rectify as required
• Clean the sensor face as required. Defrost the sensor and dry as required. Clear any debris from the sensor and holder as required. Water flowing over the sensor is a system limitation. (no action required)
• Check for non standard, bumper, exhausts/tailpipe, tow bar or external spare wheel mounting that may be being detected by the parking aid system. Rectify as required
• Ensure the area around the vehicle is clear of any obstacles, move the vehicle to a suitable area before continuing diagnosis
• Ensure no exhaust gas or warm area clouds are in the area around the parking aid sensor detection range
• Ensure the vehicle is on level ground and clear of any ramps, potholes or speed bumps, move the vehicle to a suitable area before continuing diagnosis
• Remove parking aid sensor and ensure correctly painted parking aid sensor is installed

• Parking aid sensors that are painted incorrectly and not to the manufacturer standards, will not be considered in any warranty claim

SYMPTOM:

Parking aid sensors are being returned with no faults found or signs of water ingress/corrosion

POSSIBLE CAUSE:

• Possible issue with sensor connectors not latched correctly

ACTION:

• When either no/intermittent operation has been reported the following action should be taken
• 1. Using Datalogger, identify the position of the suspect parking aid sensor within the bumper
• 2. Visually locate the position of the suspect parking aid sensor. Inspect and provide details in claim if the sensor has any sign of physical damage
• 3. Remove the bumper. Disconnect the wiring at the main harness connector.

  Inspect the main harness connectors and terminals for signs of damage, backed out pins, corrosion and water ingress, or damage to the seals. Provide details in claim if any of the above symptoms are present

• 4. Attempt to remove the harness connector from the suspect parking aid sensor without using the connector latch i.e.

  lightly pull back on ALL wires together, ensuring the harness is held close to the back of the connector, not elsewhere on the wiring harness. DO NOT apply excessive force. If the connector can be removed without using the latch, provide details in claim if connector is loose. If the connector is fully latched, disconnect it from the sensor

• 5. Inspect and provide details in claim if the suspect sensor harness connector has any sign of water ingress/corrosion
• 6. Inspect and provide details in claim if the suspect parking aid sensor harness connector shows any sign that the terminals have backed-out of the connector or for any damage to the terminal seals.

  Replace/repair the harness as required and proceed

• 7. Remove the suspect parking aid sensor from the bumper. Inspect the parking aid sensor connector for signs of water ingress/corrosion. Provide details in claim if corrosion/water ingress is present
• 8. Exchange the suspect parking aid sensor with another parking aid sensor within the bumper that is performing correctly.

  Reconnect all sensors and reconnect the bumper main harness connector. Repeat step 1. Confirm if the original fault now appears at the new position of the suspect parking aid sensor, if so, proceed to step 10

• 9. If not, carry out the appropriate open circuit and short circuit checks between the original suspect parking aid sensor harness connector and the parking aid control module
• 10. Refit the parking aid sensors to their original position in the bumper
• 11. Reconnect the parking aid sensor to the bumper harness connector. Reconnect main harness connector and refit the bumper
• 12. Repeat Step 1. If fault is still present, replace only the faulty sensor

PARKING AID SYSTEM ON - BOARD SELF - TEST

As part of the strategy of the system if any DTCs are detected, a long highpitched tone approx 3 seconds will sound and the parking aid switch (where fitted) indicator LED will flash 6 times at ignition on

• If a fault is present when the parking aid system is activated then the parking aid switch (where fitted) status LED will flash 6 times indicating an issue with front or rear parking aid sensors, wiring switch, parking aid control module or hard wired sounders
• The rear parking aid sounder/rear audio system will emit an error tone for approx 3 seconds at ignition on if a fault is detected with the front or rear sensors, the switch, or if there is a controller area network (CAN) bus error
• (Only applicable to vehicles fitted with front parking aid and a hard wired rear parking aid sounder). If there is a fault with the rear parking aid sounder the error tone will come from the front parking aid sounder unit (integral with the instrument cluster)

Audible and Visual Warnings when Parking Aid System is in Error State

PINPOINT TESTS

DTC INDEX

For a list of Diagnostic Trouble Codes (DTCs) that could be logged on this vehicle, please refer to Section 100-00. REFER to: Diagnostic Trouble Code Index - DTC: Parking Aid Control Module (PACM) (100-00 General Information, Description and Operation).

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