Inspection Procedure

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

INSPECT FUSE (RAD NO. 1, ACC)

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

Measure the resistance of the fuses.

Standard resistance

FUSE (RAD NO. 1, ACC) TESTER CONNECTION SPECIFIED CONDITION

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

NG: REPLACE FUSE

OK: Go to Next Step

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

Disconnect the K18 receiver connector.

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

Standard resistance

HARNESS AND CONNECTOR (NAVIGATION RECEIVER - BATTERY AND BODY GROUND) TESTER CONNECTION SPECIFIED CONDITION RESISTANCE

Tester Connection	Condition	Specified Condition
K18-20 (GND) -Body ground	Always	Below 1 Ω

Fig 1: Identifying K18 Receiver Connector

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

Standard voltage

HARNESS AND CONNECTOR (NAVIGATION RECEIVER - BATTERY AND BODY GROUND) TESTER CONNECTION SPECIFIED CONDITION VOLTAGE

Tester Connection	Switch Condition	Specified Condition
K18-1 (B)-Body ground	Always	11 to 14 V
K18-11 (ACC)-Body ground	Ignition switch ACC	11 to 14 V

NG: REPAIR OR REPLACE HARNESS OR CONNECTOR

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