Inspection Procedure
WARNING: This page is about a different car, the 2008 Toyota Avalon. However, it is still accessible from the selected car via links, so may be relevant.
- INSPECT NAVIGATION ECU
- Measure the voltage according to the value(s) in the table below.
Standard voltage
TESTER CONNECTION SPECIFIED CONDITION CHARTTester connection Condition Specified condition MACC - Body ground Ignition switch on (ACC) 4 to 6 V
NG: REPLACE NAVIGATION ECU
OK: Go to Next Step
- Measure the voltage according to the value(s) in the table below.
- CHECK HARNESS AND CONNECTOR (NAVIGATION ECU - BODY GROUND)
- Disconnect the navigation ECU connector L18.
- Measure the resistance according to the value(s) in the table below.
Standard resistance
TESTER CONNECTION SPECIFIED CONDITION CHARTTester connection Condition Specified condition SNSE - Body ground Always Below 1 Ω
NG: REPAIR OR REPLACE HARNESS OR CONNECTOR
OK: Go to Next Step
- CHECK HARNESS AND CONNECTOR (OVERHEAD J/B - NAVIGATION ECU)
- Disconnect the overhead J/B connector N5 and navigation ECU connector L18.
- Measure the resistance according to the value(s) in the table below.
Standard resistance
TESTER CONNECTION SPECIFIED CONDITION CHARTTester connection Condition Specified condition MACC - ACC Always Below 1 Ω MIC+ - MI1+ Always Below 1 Ω MIC- - MIC- Always Below 1 Ω MACC - Body ground Always 10 kΩ or higher MIC+ - Body ground Always 10 kΩ or higher MIC- - Body ground Always 10 kΩ or higher
NG: REPAIR OR REPLACE HARNESS OR CONNECTOR
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OK : PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE