Inspection Procedure

WARNING: This page is about a different car, the 2005 Toyota 4Runner. However, it is still accessible from the selected car via links, so may be relevant.

INSPECT RADIO AND NAVIGATION ASSY (B, ACC, GND)

Disconnect the radio and navigation assy connector R12.

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

Standard:

RADIO AND NAVIGATION ASSY GND - BODY GROUND RESISTANCE

Tester connection	Condition	Specified condition
GND - Body ground	Always	Below 1 Ω

Fig 1: Disconnecting Radio And Navigation Assy Connector R12

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

Standard:

RADIO AND NAVIGATION ASSY B- GND - ACC - GND VOLTAGE

Tester connection	Condition	Specified condition
B - GND	Always	10 to 14 V
ACC - GND	Ignition SW ACC	10 to 14 V

NG: REPAIR OR REPLACE HARNESS OR CONNECTOR

PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE OR DIAGNOSTIC TROUBLE CODE CHART