General information
Seat diagnostics can be divided into three main parts: seat movement, memory, and seat heating.
The seat heating is controlled by the automatic temperature control module, so some DTCs (DTC) match the codes for the climate control system.
There are several related systems, such as mirror and steering column movement systems, which will also be covered in this section.
Information about the systems and their operation can be found in the appropriate section of the workshop manual.
Inspection and verification
1. Check the validity of the customer's complaint.
2. Visually inspect for obvious mechanical and electrical problems.
Foreign objects may get caught in the slide rails and seat frames.
Mechanical elements | Electrical Factors |
3. If an obvious cause of a problem you identified or described by the customer is found, correct it before proceeding to the next steps (if possible).
4. Use an approved diagnostic system or scan tool (tester), to retrieve all DTCs before referring to the Symptom Table or DTC Index (DTC).
Since DTCs are stored in more than one module, a complete vehicle data readout is recommended.
Clear all DTCs after troubleshooting.
Symptom table
NOTE: Seat movement reference applies to each front seat.
Symptom | Possible reasons | Action |
The seat does not move when the switch is pressed (forward, backward, tilt, etc.) | Check for obstructions in guides, mechanisms, etc., repair if necessary. The automatic thermal switch can be activated in the event of a motor or mechanism failure. Check for DTCs that indicate a switch, motor, or module failure. | |
Steering column does not move when the switch is pressed | Check for DTCs that indicate a problem with the switch, motor, or clutch/solenoid. | |
Mirrors do not move when the switch is pressed | Mirror checks are described in the appropriate section of the workshop manual. | |
The memorized position of the seat/steering column/mirror is not restored | Before assuming memory failure, test switch operation and refer to the symptoms described above. Make sure there is sufficient battery voltage. Make sure the desired position is correctly memorized. Make sure that the memorization/restoration of the memorized position is carried out correctly. Refer to the relevant section in the workshop manual. | |
Function not working "Lazy entry" | Check if the remote transmitter controls the central lock, etc. If so, the problem is not with the transmitter. Refer to section "The memorized position is not restored" | |
Login/logout not working | Make sure the function is enabled and that the switch is set to the correct position. Check for DTCs that indicate a problem with the switch, motor, or clutch/solenoid. | |
Seat does not warm up | Check the LEDs on the switches when checking the operation of the switches. If the LEDs light up when the switch is pressed, the switches are receiving power and the switches are operating at least within the same level. Check the electrical circuits of the seat heater. Refer to the electrical manual. Check the operation of the temperature sensor. If the battery voltage is greater than 16.5 V for more than 5 seconds, the seat heating system is suspended. Refer to the relevant section in the workshop manual. | |
Part (And) seats do not warm up | Element failure | Each seat contains up to three elements. If the rest of the seat is working properly, check the connections and electrical conductivity of the element. Refer to the electrical manual. |
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