Inspection Procedure

WARNING: This page is about a different car, the 2008 Toyota Sequoia. However, it is still accessible from the selected car via links, so may be relevant.

INSPECT FUSES (RAD NO. 1, ACC)

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

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

Standard Resistance

STANDARD RESISTANCE

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

Install the fuses.

NG: REPLACE FUSES

Fig 1: Identifying ACC Fuse And RAD NO. 1 Fuse Location

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

OK: Go to Next Step

CHECK HARNESS AND CONNECTOR (NAVIGATION RECEIVER - BATTERY AND BODY GROUND)

Disconnect the I20 navigation receiver assembly connector.

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

Standard Resistance

STANDARD RESISTANCE

Tester Connection	Condition	Specified Condition
I20-20 (GND) - Body ground	Always	Below 1 Ω

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

Fig 2: Identifying I20 Navigation Receiver Assembly Connector Terminals

Standard Voltage

STANDARD VOLTAGE

Tester Connection	Switch Condition	Specified Condition
I20-1 (B) - Body ground	Always	11 to 14 V
I20-11 (ACC) - Body ground	Ignition switch ACC	11 to 14 V

Reconnect the navigation receiver assembly connector.

NG: REPAIR OR REPLACE HARNESS OR CONNECTOR

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