Mute Signal Circuit between Radio Receiver and Stereo Component Amplifier: Procedure

INSPECT STEREO COMPONENT AMPLIFIER ASSEMBLY

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

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Standard Voltage

Tester Connection	Condition	Specified Condition
O33-1 (MUTE) - Body ground	Engine switch on (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)

NG → See step 2

OK → See step 5

CHECK HARNESS AND CONNECTOR (RADIO RECEIVER ASSEMBLY - STEREO COMPONENT AMPLIFIER ASSEMBLY)

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

Standard Resistance

Tester Connection	Condition	Specified Condition
G37-7 (MUT1) - O33-1 (MUTE)	Always	Below 1 Ω
G37-7 (MUT1) - 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)

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

Standard Voltage

Tester Connection	Condition	Specified Condition
G37-7 (MUT1) - Body ground	Engine switch on (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 4

OK → See step 6

REPLACE STEREO COMPONENT AMPLIFIER ASSEMBLY. Refer to REMOVAL [03/2012 - 07/2012]
PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE. Refer to PROBLEM SYMPTOMS TABLE [03/2012 - 07/2012]
REPLACE RADIO RECEIVER ASSEMBLY. Refer to REMOVAL [03/2012 - 07/2012]