Lexus RX (RX 350L, RX450h) 2016-2025 Repair Manual: Problem Symptoms Table
PROBLEM SYMPTOMS TABLE
NOTICE:
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If the battery voltage is low, the seat heater system may not operate. When "Operation of Electrical Items Restricted." is displayed on the multi-information display in the combination meter assembly, inspect the battery, referring to On-vehicle Inspection for the charging system.
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If the battery voltage is low, the seat heater system may not operate. When "Operation of Electrical Items Restricted." is not displayed on the multi-information display in the combination meter assembly, check the Data List item "Battery Control Count (Body ECU)".
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HINT:
- Use the table below to help determine the cause of problem symptoms. If multiple suspected areas are listed, the potential causes of the symptoms are listed in order of probability in the "Suspected Area" column of the table. Check each symptom by checking the suspected areas in the order they are listed. Replace parts as necessary.
- Inspect the fuses and relays related to this system before inspecting the suspected areas below.
| Symptom | Suspected Area | Link |
|---|---|---|
| Front seat heater does not operate for driver side and front passenger side seat | Refreshing seat switch (for Front side) | - |
| Air conditioning amplifier assembly | - | |
| Wire harness or connector | - | |
| Rear seat heater does not operate for driver side and passenger side seat | Refreshing seat switch (for Rear side)*1 | - |
| Rear seat heater switch*2 | - | |
| Air conditioning amplifier assembly | - | |
| Wire harness or connector | - | |
| Seat heater for front right seat does not operate | Refer to the "Seat Heater for Front Right Seat does not Operate". | |
| Seat heater for front left seat does not operate | Refer to the "Seat Heater for Front Left Seat does not Operate". | |
| Seat heater for rear right seat does not operate | Refer to the "Seat Heater for Rear Right Seat does not Operate". | |
| Seat heater for rear left seat does not operate | Refer to the "Seat Heater for Rear Left Seat does not Operate". | |
- *1: w/o Rear No. 2 Seat
- *2: w/ Rear No. 2 Seat
Operation Check
OPERATION CHECK CHECK FRONT SEAT HEATER (a) Turn the engine switch on (IG). (b) Turn the refreshing seat switch (for front side) (heater position) on and check that the indicator illuminates and the s ...
Diagnosis System
DIAGNOSIS SYSTEM DESCRIPTION (a) Seat heater system data and Diagnostic Trouble Codes (DTCs) can be read through the Data Link Connector 3 (DLC3) of the vehicle. When the system seems to be malfunctio ...
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Lexus RX (RX 350L, RX450h) 2016-{YEAR} Owners Manual
- For your information
- Pictorial index
- For safety and security
- Instrument cluster
- Operation of each component
- Driving
- Lexus Display Audio system
- Interior features
- Maintenance and care
- When trouble arises
- Vehicle specifications
- For owners
Lexus RX (RX 350L, RX450h) 2016-{YEAR} Repair Manual
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