DESCRIPTION This circuit
sends a signal to the stereo component amplifier assembly to mute noise.
Because of that, the noise produced by changing the sound source
ceases. If there is an open in the circuit, noise can be heard from the speakers when changing the sound source.
If
there is a short in the circuit, even though the stereo component
amplifier assembly is functioning normally, no sound or only an
extremely faint sound can be heard. WIRING DIAGRAM
 PROCEDURE
| 1. |
CHECK STEREO COMPONENT AMPLIFIER ASSEMBLY |
| (a) Measure the voltage according to the value(s) in the table below.
Standard Voltage: |
Tester Connection | Switch Condition |
Specified Condition | |
J141-1 (MUTE) - Body ground |
Ignition switch ACC, audio system playing → Changing modes |
Above 3.5 V → Below 1 V | Text in Illustration |
*a | Component with harness connected
(Stereo Component Amplifier Assembly) | |
|
| OK |
 | PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE |
|
NG |
 | |
| 2. |
CHECK HARNESS AND CONNECTOR (NAVIGATION RECEIVER ASSEMBLY - STEREO COMPONENT AMPLIFIER ASSEMBLY) |
(a) Disconnect the J135 navigation receiver assembly connector. (b) Disconnect the J141 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 | |
J135-16 (MUT1) - J141-1 (MUTE) |
Always | Below 1 Ω | |
J135-16 (MUT1) - Body ground |
Always | 10 kΩ or higher |
| NG |
| REPAIR OR REPLACE HARNESS OR CONNECTOR |
|
OK | |
| |
| 3. |
CHECK STEREO COMPONENT AMPLIFIER ASSEMBLY (OUTPUT SIGNAL) |
(a) Disconnect the navigation receiver assembly connector.
| (b) Measure the voltage according to the value(s) in the table below.
Standard Voltage: |
Tester Connection | Switch Condition |
Specified Condition | |
J135-16 (MUT1) - Body ground |
Ignition switch ACC, audio system is playing |
Above 3.5 V | Text in Illustration |
*a | Front view of wire harness connector (to Navigation Receiver Assembly) | Result |
Result | Proceed to | |
OK (for Column Shift Type) |
A | | OK (for Floor Shift Type) |
B | | NG |
C | | |
| A |
| REPLACE NAVIGATION RECEIVER ASSEMBLY |
| B |
| REPLACE NAVIGATION RECEIVER ASSEMBLY |
| C |
| REPLACE STEREO COMPONENT AMPLIFIER ASSEMBLY | | 
