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. |
|
(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 |
READ NEXT:
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
Parts Location
PARTS LOCATION ILLUSTRATION *1 SPIRAL CABLE SUB-ASSEMBLY *2 STEERING WHEEL HEATER SWITCH (REFRESHING SEAT SWITCH) *3 INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY - ECU-IG1 NO. 3 FUSE *4
SEE MORE:
How To Proceed With Troubleshooting
CAUTION / NOTICE / HINT HINT:
The ECM is connected to the CAN communication system. Therefore, before starting troubleshooting, make sure to check that there are no malfunctions in the CAN communication system.
*: Use the Techstream.
PROCEDURE 1. VEHICLE BROUGHT TO WORKSHOP
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Power Mirror cannot be Adjusted with Power Mirror Switch
DESCRIPTION The outer mirror switch assembly sends the mirror adjust switch signals to the main body ECU (multiplex network body ECU). The main body ECU (multiplex network body ECU) then sends the received mirror adjust switch signals to each outer mirror control ECU assembly via CAN communication.
