AUDIO / VIDEO: AUDIO AND VISUAL SYSTEM: Mute Signal Circuit between Stereo Component Amplifier and Telematics Transceiver; 2018 - 2019 MY Camry HV [07/2017

Last Modified: 11-20-2023	6.11:8.1.0	Doc ID: RM10000000162L1
Model Year Start: 2018	Model: Camry HV	Prod Date Range: [07/2017 - 09/2019]
Title: AUDIO / VIDEO: AUDIO AND VISUAL SYSTEM: Mute Signal Circuit between Stereo Component Amplifier and Telematics Transceiver; 2018 - 2019 MY Camry HV [07/2017 - 09/2019]

Mute Signal Circuit between Stereo Component Amplifier and Telematics Transceiver

DESCRIPTION

The DCM (telematics transceiver) sends a mute signal to the stereo component amplifier assembly.

The stereo component amplifier assembly controls the volume according to the mute signal from the DCM (telematics transceiver).

NOTICE:

Depending on the parts that are replaced during vehicle inspection or maintenance, performing initialization, registration or calibration may be needed. Refer to Precaution for Audio and Visual System.
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When replacing the radio and display receiver assembly, always replace it with a new one. If a radio and display receiver assembly which was installed to another vehicle is used, the following may occur:
- A communication malfunction DTC may be stored.
- The radio and display receiver assembly may not operate normally.
Before replacing the DCM (telematics transceiver), refer to Registration.
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1.	INSPECT DCM (TELEMATICS TRANSCEIVER)

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

Standard Voltage:

Tester Connection

Condition

Specified Condition

K12-17 (MUTE) - Body ground

Power switch on (ACC)

Audio system playing

→ Emergency call mode

2.0 V or higher

→ Below 1 V

*a	Component with harness connected (DCM (Telematics Transceiver))

PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE

2.	CHECK HARNESS AND CONNECTOR (STEREO COMPONENT AMPLIFIER ASSEMBLY - DCM (TELEMATICS TRANSCEIVER))

(a) Disconnect the K9 stereo component amplifier assembly connector.

(b) Disconnect the K12 DCM (telematics transceiver) connector.

Standard Resistance:

Tester Connection	Condition	Specified Condition
K9-24 (TMUT) - K12-17 (MUTE)	Always	Below 1 Ω
K9-24 (TMUT) or K12-17 (MUTE) - Body ground	Always	10 kΩ or higher

REPAIR OR REPLACE HARNESS OR CONNECTOR

3.	INSPECT STEREO COMPONENT AMPLIFIER ASSEMBLY

(a) Disconnect the K12 DCM (telematics transceiver) connector.

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

Standard Voltage:

Tester Connection	Condition	Specified Condition
K12-17 (MUTE) - Body ground	Power switch on (IG)	2.0 V or higher

*a	Front view of wire harness connector (to DCM (Telematics Transceiver))