Inspection Procedure
WARNING: This page is about a different car, the 2007 Toyota Prius. However, it is still accessible from the selected car via links, so may be relevant.
HINT:
Check if the combination meter operation is normal before performing the following procedure.
- CHECK HEADLIGHT BEAM LEVEL CONTROL ECU (SPEED VOLTAGE)
- Measure the voltage of the wire harness side connector.
Standard voltage
TESTER CONNECTION - SPECIFIED CONDITIONTester Connection Tool Setting Condition Specified Condition H12-12 (SPDR) - Body ground 5 V / DIV., 2 msec. / DIV. Vehicle is driving approx. 30 km/h (19 mph) 0 to 14 V Pulse generation (see waveform 1) OK : Waveform is output as shown in Fig 1 .
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
OK : PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE
NG : GO TO NEXT STEP
- Measure the voltage of the wire harness side connector.
- CHECK WIRE HARNESS (ECU - METER)
- Disconnect the H12 ECU connector.
- Disconnect the C10 meter connector.
- Measure the resistance of the wire harness side connectors.
Standard resistance
TESTER CONNECTION - SPECIFIED CONDITIONTester Connection Specified Condition H12-12 (SPDR) - C10-13 Below 1 H12-12 (SPDR) - Body ground 10 k or higher
NG : REPAIR OR REPLACE HARNESS AND CONNECTOR
OK : REPLACE COMBINATION METER