Inspection Procedure

WARNING: This page is about a different car, the 2009 Toyota Tacoma. However, it is still accessible from the selected car via links, so may be relevant.

INSPECT FUSES (RADIO NO. 1, ACC)

Remove the RADIO NO. 1 fuse from the engine room junction block.
Remove the ACC fuse from the main body ECU.

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

Standard Resistance

RESISTANCE SPECIFICATION

Tester Connection	Condition	Specified Condition
RADIO NO. 1 fuse	Always	Below 1 Ω
ACC fuse	Always	Below 1 Ω

Install the fuses.

NG: REPLACE FUSES

Fig 1: Identifying Radio No. 1 Fuse And ACC Fuse

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

OK: Go to next step.

CHECK HARNESS AND CONNECTOR (RADIO RECEIVER ASSEMBLY - BATTERY AND BODY GROUND)

Disconnect the R1 radio receiver assembly connector.

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

Standard Resistance

for Except Double Cab with 7 Speakers

RESISTANCE SPECIFICATION

Tester Connection	Condition	Specified Condition
R1-7 (GND) - Body ground	Always	Below 1 Ω

for Double Cab with 7 Speakers

RESISTANCE SPECIFICATION

Tester Connection	Condition	Specified Condition
R1-20 (GND) - Body ground	Always	Below 1 Ω

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

Standard Voltage

for Except Double Cab with 7 Speakers

VOLTAGE SPECIFICATION

Tester Connection	Switch Condition	Specified Condition
R1-4 (B) - Body ground	Always	11 to 14 V
R1-3 (ACC) - Body ground	Ignition switch ACC	11 to 14 V

Fig 2: Identifying R1 Radio Receiver Assembly Connector Terminals

for Double Cab with 7 Speakers

VOLTAGE SPECIFICATION

Tester Connection	Switch Condition	Specified Condition
R1 - 1 (B) - Body ground	Always	11 to 14 V
R1-11 (ACC) - Body ground	Ignition switch ACC	11 to 14 V

Reconnect the radio receiver assembly connector.

NG: REPAIR OR REPLACE HARNESS OR CONNECTOR

OK: PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE (See PROBLEM SYMPTOMS TABLE )