Lexus ES: Steering Wheel does not Heat Up When Heated Steering Wheel Switch is Pressed
DESCRIPTION
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WIRING DIAGRAM
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CAUTION / NOTICE / HINT
NOTICE:
The vehicle is equipped with a Supplemental Restraint System (SRS) which includes components such as airbags. Before servicing (including removal or installation of parts), be sure to read the precaution for Supplemental Restraint System.
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PROCEDURE
| 1. | INSPECT STEERING WHEEL ASSEMBLY (THERMOSTAT, HEATER AND THERMISTOR) |
| (a) Disconnect the B heated steering wheel controller (steering vibration ECU) connector. |
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(b) Measure the resistance according to the value(s) in the table below.
Standard Resistance (for F SPORT Models):
| Tester Connection | Condition | Specified Condition |
|---|---|---|
| B-1 (SH1) - B-4 (SH3) | 20°C (68°F) | 2.52 to 3.00 Ω |
| B-1 (SH1) - B-5 (SH2) | 20°C (68°F) | 2.52 to 3.00 Ω |
| B-2 (TH1) - B-3 (TH2) | 10 to 30°C (50 to 86°F) | 4.228 to 8.701 kΩ |
Standard Resistance (except F SPORT Models):
| Tester Connection | Condition | Specified Condition |
|---|---|---|
| B-1 (SH1) - B-4 (SH3) | 20°C (68°F) | 2.33 to 2.77 Ω |
| B-1 (SH1) - B-5 (SH2) | 20°C (68°F) | 2.33 to 2.77 Ω |
| B-2 (TH1) - B-3 (TH2) | 10 to 30°C (50 to 86°F) | 4.228 to 8.701 kΩ |
| OK | .gif) | REPLACE HEATED STEERING WHEEL CONTROLLER (STEERING VIBRATION ECU) |
| NG | | REPLACE STEERING WHEEL ASSEMBLY |
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Precaution
PRECAUTION PRECAUTION FOR DISCONNECTING CABLE FROM NEGATIVE AUXILIARY BATTERY TERMINAL NOTICE: When disconnecting the cable from the negative (-) auxiliary battery terminal, initialize the following s
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How To Proceed With Troubleshooting
CAUTION / NOTICE / HINT HINT:
Use these procedures to troubleshoot the heated steering wheel system.
*: Use the Techstream.
PROCEDURE 1. VEHICLE BROUGHT TO WORKSHOP
NEXT 2. INSPECT BATTERY VOLTAGE (a) Measure the battery voltage with the engine switch off.
Precaution
PRECAUTION INITIALIZATION NOTICE: Make sure to perform the necessary procedures (adjustment, calibration, initialization, or registration) after parts related to the cable has been disconnected from the negative (-) battery terminal. Click here CHARGING SYSTEM PRECAUTION NOTICE:
Check that the
