Car: Land Rover Model: Range Rover System: Air Conditioning Year model: 2022  Fault phenomenon: The customer complained about operating the lower display screen of the integrated control panel after starting the vehicle, and found that after the vehicle air conditioner was turned on, it automatically turned off. After the test vehicle seat heating and cooling functions were turned on, it still automatically turned off. The driver found this fault, which has nothing to do with the ambient temperature and is permanent. Check that the vehicle has no additional or modified items, and the maintenance history query has no relevant maintenance...

Car: Buick Model: GL8 System: Electrical Year: 2021  Fault phenomenon: The right-hand power sliding door cannot be closed electrically via the headliner or the right-hand B-pillar closing switch.  Troubleshooting: After receiving the customer's repair request, the following inspections were carried out according to the SBD process:  Understand and confirm the fault description. Ask the customer about the time, place, phenomenon, and frequency of the failure. The customer just bought a new car, and when he was about to install it in the modification shop, he found that he pressed the closing button of the electric sliding door on the right...

Fault phenomenon: The owner of this car reported that the central control door lock did not work properly. The specific phenomenon is that when the door is locked with the remote control, the 4 doors can be locked normally. When the door is opened with the remote control, the 4 doors cannot be unlocked. Only the left front door can be opened with the mechanical key to enter the car, and the vehicle starts normally.   Troubleshooting: After picking up the car, we first confirm the fault. It is indeed as described by the car owner that the door can...

Model: F02, equipped with N52 engine. Driving mileage: 7659 miles.  Fault phenomenon: The left front door of BMW 730Li could neither be opened inside or outside, and the other three doors were kept unlocked and could be opened on both sides.  Diagnosis: There is no relevant fault record detected by the diagnostic instrument. When the car is locked with the car key, the four door locks do not respond, only the trunk and fuel tank cover can be locked, and there are double flashing warning signs. When unlocking with the car key, the 4 door locks do not respond, the...

Car: Porsche Model: Macan System: Engine Year model: 2020  Troubleshooting: Use a diagnostic instrument to detect the fault code in the PSM control unit (commonly known as ABS anti-lock braking system): 011D03 Mechanical failure of the right front wheel speed sensor, other control unit fault codes are the accompanying fault codes caused by the PSM system fault, and other faults when the instrument is on, the light is caused by a malfunction of the PSM.  The technician replaced the right front wheel speed sensor based on the previous maintenance experience, cleared the fault code, and tested the car. The customer...

Car: Cadillac Model: CT6 System: Engine Year model: 2020  Issue: The customer reported that recently the vehicle intermittently prompted a warning light indicating a reduction in engine power.  Fault diagnosis: Start the vehicle road test, after driving for a period of time, the engine fault light was on and the instrument prompted the fault information of engine power dropping. It was then verified that the problem described by the customer was true.  Check whether there are modified parts, etc. In this case, the vehicle did not have any modifications and program changes.  Connect the diagnostic device (GDS) to the vehicle...

Model: C8, equipped with DPMA engine and 0CK transmission. Driving mileage: 233 miles.  Issue: The customer reported that sometimes the fan will run automatically after the remote control opens the door or stops the car. The diagnostic instrument finds that there is a fault code "P069300 cooling fan actuation 2, short-circuit to ground" in the thermal management control unit J1024.  Troubleshooting: The car is a plug-in hybrid vehicle, the temperature of the air conditioner and engine as well as the temperature of the high voltage components and the cooling fan are controlled by the thermal management control unit J1024. Referring...

Brand: Mercedes-Benz Model: GLE350e System: Charging Year model: 2022 Issue: When the new car is in pre-delivery inspection (PDI), it is found that the instrument battery alarms, and the low-voltage power system cannot be charged.  Troubleshooting: This fault was discovered in the PDI of the new car, the low-voltage system could not be charged, the battery warning light is illuminated. The vehicle can be started, but it has been consuming power, up to -40A, and the high-voltage system is normal. No relevant DTCs were found in a quick test. Before diagnosing faults, we should first be familiar with the structural...

  Model: Lexus IS sedan Driving Mileage: 74565 miles  Issue: The customer came to the store and reported that the vehicle's audio (as shown in Figure 1) would not work, and asked for inspection and maintenance.  Figure 1  Troubleshooting: We turned on the radio after starting the car and found that there was no sound from the stereo, and no response occurred when we tried to adjust the volume. However, the volume shown on the navigation did change, so we adjusted the playback mode to CD playback, but there was still no sound. We asked the customer about the car's...

Model: C300 with 274 engine. Driving Mileage: 18,465 miles Issue: When the ignition switch is turned on, the steering wheel vibrates, and the multi-function display in the center of the instrument prompts "the lane keeping assist system has stopped working".  Troubleshooting: Connect the diagnostic instrument to perform a quick test. The steering column module N80 has a fault code: B1E9F15 steering wheel electronic device has functional failure, there is a short circuit or open circuit to the positive pole; B1EB015 lane keeping assist system has a fault, there is short circuit or open circuit to positive; there is also a...

Issue: The car's keyless entry function is invalid.  Diagnosis: The vehicle is new. When doing PDI, the maintenance professional discovered that the system had a fault code: “B117113 enters and starts the system antenna in the bumper is open, static," which was deleted after the fault code was removed. When testing the four-door keyless entry function, the door lock function was working, but on the second day, the customer reported the failure again.  After the technician picks up the car and turns on the ignition switch, the instrument displays "Fault: Keyless System". The fault code is still B117113.  The entry...

VIN: SALMN15486A××××××. Driving mileage: 33418 miles. Issue: The customer reported that the sunroof of the car could not be opened.  Diagnosis: The car was brought into the factory for routine repair. The sunroof could not be opened, according to the owner. The sunroof did not respond when the sunroof switch was operated after the vehicle key was switched on, according to the fault verification. The sunroof calibration with Land Rover's unique diagnostic device yields no results.  When connecting the diagnostic instrument to read the fault code, no associated fault code is found. The following are the main reasons for the...