Lexus NX: 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 assembly, and then is sent to the speakers.
If there is an open or short in this circuit, sound cannot be heard from the speakers even if the stereo component amplifier assembly or speakers are not malfunctioning.
WIRING DIAGRAM
PROCEDURE
| 1. | CHECK HARNESS AND CONNECTOR (RADIO RECEIVER ASSEMBLY - STEREO COMPONENT AMPLIFIER ASSEMBLY) |
(a) Disconnect the I154 radio and display receiver assembly connector.
(b) Disconnect the P46 stereo component amplifier assembly connector.
(c) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
| Tester Connection | Condition | Specified Condition |
|---|---|---|
| P46-5 (R+) - I154-1 (FR+) | Always | Below 1 Ω |
| P46-4 (R-) - I154-6 (FR-) | Always | Below 1 Ω |
| P46-3 (L+) - I154-2 (FL+) | Always | Below 1 Ω |
| P46-2 (L-) - I154-7 (FL-) | Always | Below 1 Ω |
| P46-6 (SLD) - Body ground | Always | 10 kΩ or higher |
| P46-5 (R+) or I154-1 (FR+) - Body ground | Always | 10 kΩ or higher |
| P46-4 (R-) or I154-6 (FR-) - Body ground | Always | 10 kΩ or higher |
| P46-3 (L+) or I154-2 (FL+) - Body ground | Always | 10 kΩ or higher |
| P46-2 (L-) or I154-7 (FL-) - Body ground | Always | 10 kΩ or higher |
| OK | .gif) | PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE |
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| NG | | REPAIR OR REPLACE HARNESS OR CONNECTOR |
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Parts Location
PARTS LOCATION ILLUSTRATION *1 AIR CONDITIONING CONTROL ASSEMBLY - REAR WINDOW DEFOGGER SWITCH *2 INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY - ECU-IG NO.1 FUSE - ECU-IG NO.3 FUSE *3 DLC3 - - ILLUSTRATION *1 DEFOGGER RELAY *2 AIR CONDITIONING AMPLIFIER ASSEMBLY *3
Inspection
INSPECTION CAUTION / NOTICE / HINT HINT:
Use the same procedure for the RH and LH sides.
The procedure listed below is for the LH side.
PROCEDURE 1. INSPECT REAR NO. 1 SUSPENSION ARM ASSEMBLY LH (a) Inspect the turning torque of the ball joint. (1) Install the installation nut to the ball j
