Multi-media Interface ECU Power Source Circuit (From 8/2009): Procedure
- INSPECT MULTI-MEDIA INTERFACE ECU
- Disconnect the multi-media interface ECU connector.
- Measure the voltage according to the value(s) in the table below.
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
Standard Voltage
Tester Connection Condition Specified Condition U9-12 (+B) - U9-7 (GND) Always 11 to 14 V U9-11 (ACC) - U9-7 (GND) Engine switch on (ACC) 11 to 14 V
NG → See step 3
OK → See step 2
- PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE. Refer to PROBLEM SYMPTOMS TABLE
- CHECK HARNESS AND CONNECTOR
- Disconnect the radio receiver assembly connector.
- Measure the resistance according to the value(s) in the table below.
Standard Resistance
Tester Connection Condition Specified Condition U9-11 (ACC) - G11-11 (ACC) Always Below 1 Ω U9-12 (+B) - G11-12 (+B) Always Below 1 Ω U9-7 (GND) - G11-7 (GND) Always Below 1 Ω U9-11 (ACC) - Body ground Always 10 kΩ or higher U9-12 (B+) - Body ground Always 10 kΩ or higher U9-7 (GND) - Body ground Always 10 kΩ or higher TEXT IN ILLUSTRATION*1 Front view of wire harness connector
(to Multi-media Interface ECU)*2 Front view of wire harness connector
(to Radio Receiver Assembly)
NG → REPAIR OR REPLACE HARNESS OR CONNECTOR
OK → See step 2