Multi-media Interface ECU Power Source Circuit: Procedure
- CHECK MULTI-MEDIA INTERFACE ECU
- Disconnect the H27 multi-media interface ECU connector.
- Measure the voltage according to the value(s) in the table below.STANDARD VOLTAGE
Tester Connection Condition Specified Condition H27-12 (+B) - H27-7 (GND) Always 11 to 14 V H27-11 (ACC) - H27-7 (GND) Engine switch on (ACC) 11 to 14 V TEXT IN ILLUSTRATION*a Front view of wire harness connector
(to Multi-media Interface ECU)
NG → See step 2
OK → See step 3
- Disconnect the H27 multi-media interface ECU connector.
- CHECK HARNESS AND CONNECTOR (MULTI-MEDIA INTERFACE ECU - RADIO RECEIVER)
- Disconnect the H27 multi-media interface ECU connector.
- Disconnect the H28 radio receiver assembly connector.
- Measure the resistance according to the value(s) in the table below.STANDARD RESISTANCE
Tester Connection Condition Specified Condition H27-11 (ACC) - H28-11 (ACC) Always Below 1 Ω H27-12 (+B) - H28-12 (+B) Always Below 1 Ω H27-7 (GND) - H28-7 (GND) Always Below 1 Ω H27-11 (ACC) - Body ground Always 10 kΩ or higher H27-12 (B+) - Body ground Always 10 kΩ or higher H27-7 (GND) - Body ground Always 10 kΩ or higher
NG → REPAIR OR REPLACE HARNESS OR CONNECTOR
OK → See step 4
- PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE. Refer to PROBLEM SYMPTOMS TABLE [06/2012 - ]
- REPLACE RADIO RECEIVER ASSEMBLY. Refer to REMOVAL [06/2012 - ]