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:
Cruise Control Input Processor (P160700)
MONITOR DESCRIPTION The ECM continuously monitors its main and sub CPUs. This self-check ensures that the ECM is functioning properly. If outputs from the CPUs are different and deviate from the standard, the ECM will illuminate the MIL and store the DTC immediately. DTC No. Detection Item DT
Sub Radiator
ComponentsCOMPONENTS ILLUSTRATION *1 RADIATOR ASSEMBLY - - RemovalREMOVAL CAUTION / NOTICE / HINT The necessary procedures (adjustment, calibration, initialization or registration) that must be performed after parts are removed and installed, or replaced during radiator assembly remov
