Inspection Procedure

WARNING: This page is about a different car, the 2009 Toyota Prius. However, it is still accessible from the selected car via links, so may be relevant.

CHECK OPERATION OF SPEEDOMETER
1. Drive the vehicle and check if the function of the speedometer on the combination meter is normal.
  OK:
  
  Actual vehicle speed and the speed indicated on the speedometer are the same.
  
  HINT:
  
  The vehicle speed sensor is functioning normally when the indication on the speedometer is normal.
NG: GO TO METER / GAUGE SYSTEM

OK: Go to next step
CHECK STEREO COMPONENT AMPLIFIER
1. Disconnect the S15 amplifier connector.
2. Measure the voltage.
  1. Jack up either one of the drive wheels.
  2. Move the shift lever to the neutral position.
  3. Turn the power switch ON (IG).
    
    Fig 1: Identifying S15 Amplifier Connector
    Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  4. Measure the voltage between terminal 11 (SPD) of the stereo component amplifier and body ground when the drive wheels are turned slowly.
    OK:
    
    Voltage pulses as shown in the illustration.
OK: REPLACE STEREO COMPONENT AMPLIFIER

Fig 2: Voltage Pulses For SPD
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

NG: Go to next step

CHECK WIRE HARNESS (COMBINATION METER - STEREO COMPONENT AMPLIFIER)

Disconnect the S15 amplifier connector.
Disconnect the C10 meter connector.

Measure the resistance of the wire harness side connectors.

Standard resistance

STANDARD RESISTANCE

Tester Connection	Specified Condition
S15-11 (SPD) - C10-13	Below 1 Ω

NG: REPAIR OR REPLACE HARNESS AND CONNECTOR

Fig 3: Identifying C10 Meter Connector

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

OK: Go to next step

CHECK WIRE HARNESS (STEREO COMPONENT AMPLIFIER - BODY GROUND)

Disconnect the S15 amplifier connector.

Measure the resistance of the wire harness side connector.

Standard resistance

STANDARD RESISTANCE

Tester Connection	Specified Condition
S15-11 (SPD) - Body ground	10 kΩ or higher

HINT:

If the resistance between terminal 11 (SPD) and body ground is less than 10 kΩ, there may be a short in a wire harness, connector, or an ECU that is connected to the SPD signal wire.

Fig 4: Identifying S15 Amplifier Connector

NG: REPAIR OR REPLACE HARNESS AND CONNECTOR

OK: REPLACE STEREO COMPONENT AMPLIFIER