Lexus NX: Steering Pad Switch Circuit
DESCRIPTION
This circuit sends an operation signal from the steering pad switch assembly to the radio receiver assembly.
If there is an open in the circuit, the audio system cannot be operated using the steering pad switch assembly.
If there is a short in the circuit, the same condition as when a switch is continuously depressed occurs.
Therefore, the radio receiver assembly cannot be operated using the steering pad switch assembly, and also the radio receiver assembly itself cannot function.
WIRING DIAGRAM
CAUTION / NOTICE / HINT
NOTICE:
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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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After turning the power switch off, waiting time may be required before disconnecting the cable from the negative (-) auxiliary battery terminal.
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When disconnecting and reconnecting the auxiliary battery.
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HINT:
When disconnecting and reconnecting the auxiliary battery, there is an automatic learning function that completes learning when the respective system is used.
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PROCEDURE
| 1. | INSPECT STEERING PAD SWITCH ASSEMBLY |
(a) Remove the steering pad switch assembly.
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(b) Inspect the steering pad switch assembly.
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| NG | .gif) | REPLACE STEERING PAD SWITCH ASSEMBLY |
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| 2. | INSPECT SPIRAL CABLE SUB-ASSEMBLY |
(a) Remove the spiral cable sub-assembly.
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(b) Inspect the spiral cable sub-assembly.
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| NG | | REPLACE SPIRAL CABLE SUB-ASSEMBLY |
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| 3. | CHECK HARNESS AND CONNECTOR (RADIO RECEIVER ASSEMBLY - SPIRAL CABLE SUB-ASSEMBLY) |
(a) Disconnect the I151 radio receiver assembly connector.
(b) Disconnect the I4 spiral cable sub-assembly connector.
(c) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
| Tester Connection | Condition | Specified Condition |
|---|---|---|
| I151-21 (SW1) - I4-6 (AU1) | Always | Below 1 Ω |
| I151-22 (SW2) - I4-5 (AU2) | Always | Below 1 Ω |
| I151-24 (SWG) - I4-3 (EAU) | Always | Below 1 Ω |
| I151-21 (SW1) - Body ground | Always | 10 kΩ or higher |
| I151-22 (SW2) - Body ground | Always | 10 kΩ or higher |
| OK | | PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE |
| NG | | REPAIR OR REPLACE HARNESS OR CONNECTOR |
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Speaker Circuit
DESCRIPTION If there is a short in a speaker circuit, the stereo component amplifier assembly detects it and stops output to the speakers. As a result, sound cannot be heard from the speakers even if
Sound Signal Circuit between Radio Receiver and Stereo Component Amplifier
DESCRIPTION The radio receiver assembly sends a sound signal to the stereo component amplifier assembly via this circuit. The sound signal that is sent is amplified by the stereo component amplifier a
SEE MORE:
Installation
INSTALLATION CAUTION / NOTICE / HINT HINT:
Use the same procedure for the RH and LH sides.
The procedure listed below is for the LH side.
A bolt without a torque specification is shown in the standard bolt chart.
Click here PROCEDURE 1. INSTALL REAR DOOR INSIDE LOCKING CABLE ASSEMBLY LH
Precaution
PRECAUTION FOR OPERATION OF ELECTRICAL ITEMS RESTRICTED NOTICE:
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, in
