Lexus NX: Problem Symptoms Table
PROBLEM SYMPTOMS TABLE
NOTICE:
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If the auxiliary battery voltage is low, the seat heater system may not operate. When "High Power Consumption / Partial Limit On AC/Heater Operation" is displayed on the multi-information display in the combination meter assembly, inspect the auxiliary battery, referring to On-vehicle Inspection for the charging system.
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HINT:
If the auxiliary battery voltage is low, "Operation Limitation Control History Count (Level 1)" and "Operation Limitation Control History Count (Level 2) is counted.
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If the auxiliary battery voltage is low, the seat heater system may not operate. Refer to Data List for power steering system.
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for Manual Tilt and Manual Telescopic Steering Column:
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for Power Tilt and Power Telescopic Steering Column:
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for Manual Tilt and Manual Telescopic Steering Column:
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 |
|---|---|---|
| Seat heater does not operate for driver side and front passenger side seat | Harness and connector | - |
| Air conditioning control assembly | | |
| Air conditioning amplifier assembly | | |
| Driver side seat heater does not operate | Proceed to "Seat Heater for Front Left Seat does not Operate" | |
| Front passenger side seat heater does not operate | Proceed to "Seat Heater for Front Right Seat does not Operate" | |
| Rear seat LH heater does not operate* | Proceed to "Seat Heater for Rear Left Seat does not Operate" | |
| Rear seat RH heater does not operate* | Proceed to "Seat Heater for Rear Right Seat does not Operate" | |
| Rear seat LH and RH heaters do not operate* | Proceed to "Seat Heater Switch Circuit" | |
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Terminals Of Ecu
TERMINALS OF ECU CHECK AIR CONDITIONING AMPLIFIER ASSEMBLY (a) Disconnect the I50 air conditioning amplifier assembly connector. (b) Measure the voltage and resistance according to the value(s) in th
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
Dtc Check / Clear
DTC CHECK / CLEAR CHECK DTC (a) Connect the Techstream to the DLC3. (b) Turn the power switch on (IG). (c) Turn the Techstream on. (d) Enter the following menus: Body Electrical / Air Conditioner / Tr
SEE MORE:
How To Proceed With Troubleshooting
CAUTION / NOTICE / HINT HINT:
Use the following procedure to troubleshoot the seat heater system.
*: Use the Techstream.
PROCEDURE 1. VEHICLE BROUGHT TO WORKSHOP
NEXT 2. CUSTOMER PROBLEM ANALYSIS HINT:
In troubleshooting, confirm that the problem symptom
Start Up Signal Circuit between Radio Receiver Assembly and Navigation ECU
DESCRIPTION This circuit includes the navigation ECU and radio and display receiver assembly. WIRING DIAGRAM PROCEDURE 1. CHECK HARNESS AND CONNECTOR (RADIO RECEIVER ASSEMBLY - NAVIGATION ECU) (a) Disconnect the I153 radio receiver assembly connector. (b) Disconnect the I173 navigation ECU
