Mute Signal Circuit between Radio Receiver and Stereo Component Amplifier (TO 12/2010): Procedure

WARNING: This page is about a different car, the 2011 Toyota Avalon. However, it is still accessible from the selected car via links, so may be relevant.

INSPECT STEREO COMPONENT AMPLIFIER ASSEMBLY

Measure the voltage according to the value(s) in the table below.

Fig 1: Identifying Stereo Component Amplifier Assembly Connector Terminals

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

Standard Voltage

Tester Connection	Condition	Specified Condition
E20-1 (MUTE) - Body ground	Ignition switch ACC, audio system is playing → Changing sources	Above 3.5 V → Below 1 V

TEXT IN ILLUSTRATION

*a	Component with harness connected (Stereo Component Amplifier Assembly)

NG → See step 2

OK → See step 5

CHECK HARNESS AND CONNECTOR

Disconnect the radio receiver assembly and stereo component amplifier assembly connectors.

Measure the resistance according to the value(s) in the table below.

Standard Resistance

Tester Connection	Condition	Specified Condition
E31-7 (MUTE) - E20-1 (MUTE)	Always	Below 1 Ω
E31-7 (MUTE) - Body ground	Always	10 kΩ or higher

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR

OK: Go to next step

INSPECT STEREO COMPONENT AMPLIFIER ASSEMBLY (OUTPUT SIGNAL)

Reconnect the stereo component amplifier assembly connector.

Fig 2: Identifying Stereo Component Amplifier Assembly (Output Signal) Connector Terminals
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

Measure the voltage according to the value(s) in the table below.

Standard Voltage

Tester Connection	Condition	Specified Condition
E31-7 (MUTE) - Body ground	Ignition switch ACC, audio system is playing	Above 3.5 V

TEXT IN ILLUSTRATION

*a	Front view of wire harness connector (to Radio Receiver Assembly)

NG → See step 6

OK → See step 4

REPLACE RADIO RECEIVER ASSEMBLY. Refer to REMOVAL
PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE. Refer to PROBLEM SYMPTOMS TABLE
REPLACE STEREO COMPONENT AMPLIFIER ASSEMBLY. Refer to REMOVAL