Inspection Procedure

WARNING: This page is about a different car, the 2007 Toyota Tacoma. However, it is still accessible from the selected car via links, so may be relevant.

INSPECT STEREO COMPONENT AMPLIFIER ASSEMBLY

Measure the voltage.

Standard

TESTER CONNECTION AND SPECIFIED CONDITION

Tester Connection	Condition	Specified Condition
MUTE (S23-1) - Body ground	Turn ignition switch to ACC, Audio system is playing --> Changing	Above 3.5 V --> Below 1 V

OK: PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE

Fig 1: Identifying S23 Terminals

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

NG: Go to next step

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

Disconnect the R1 radio receiver assembly connector and S23 stereo component amplifier assembly connector.

Check the resistance.

Standard

TESTER CONNECTION AND SPECIFIED CONDITION

Tester Connection	Condition	Specified Condition
MUTE (R1-7) - MUTE (S23-1)	Always	Below 1
MUTE (R1-7) - Body ground	Always	10 k or higher

NG: REPAIR OR REPLACE HARNESS OR CONNECTOR

Fig 2: Identifying R1 Radio Receiver Assembly Connector Terminals

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

OK: Go to next step

INSPECT RADIO RECEIVER ASSEMBLY

Reconnect the R1 stereo component amplifier assembly connector.
Turn the ignition switch to the ACC position.

Measure the voltage.

Standard

TESTER CONNECTION AND SPECIFIED CONDITION

Tester Connection	Condition	Specified Condition
MUTE (R1-7) - Body ground	Turn ignition switch to ACC	3.5 V or higher

NG: REPAIR OR REPLACE STEREO COMPONENT AMPLIFIER ASSEMBLY

Fig 3: Identifying R1 Stereo Component Amplifier Assembly Connector Terminals

OK: REPLACE RADIO RECEIVER ASSEMBLY