Inspection Procedure

WARNING: This page is about a different car, the 2007 Lexus ES 350. However, it is still accessible from the selected car via links, so may be relevant.

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: CHECK COMBINATION METER

OK: Go to Next Step
INSPECT STEREO COMPONENT AMPLIFIER
1. Disconnect the stereo component amplifier connector M30.
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 engine switch on (IG).
    
    Fig 1: Identifying Stereo Component Amplifier Connector Terminal M30
    Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  4. Measure the voltage between terminal SPD of the wire harness connector and body ground when the drive wheels are turned slowly.
    OK: Voltage pulses as shown in the illustration.
Fig 2: Voltage Pulses
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

NG: Go to step 3

OK: REPLACE STEREO COMPONENT AMPLIFIER

CHECK HARNESS AND CONNECTOR (COMBINATION METER - STEREO COMPONENT AMPLIFIER)

Disconnect the stereo component amplifier connector M30 and combination meter connector E20.

Measure the resistance according to the value(s) in the table below.

Standard resistance

RESISTANCE SPECIFICATION

Tester Connection	Condition	Specified Condition
SPD - +S	Engine switch off	Below 1 Ω

Fig 3: Identifying Stereo Component Amplifier Connector M30 And Combination Meter Connector E20

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

NG: REPAIR OR REPLACE HARNESS OR CONNECTOR

OK: Go to Next Step

CHECK HARNESS AND CONNECTOR (COMBINATION METER - STEREO COMPONENT AMPLIFIER)

Disconnect the stereo component amplifier connector M30 and combination meter connector E20.

Measure the resistance according to the value(s) in the table below.

Standard resistance

RESISTANCE SPECIFICATION

Tester Connection	Condition	Specified Condition
SPD - Body ground	Engine switch off	10 kΩ or higher

HINT:

If the resistance between terminal 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 Stereo Component Amplifier Connector M30 And Combination Meter Connector E20

NG: REPAIR OR REPLACE HARNESS OR CONNECTOR OR CHECK EACH ECU

OK: REPLACE COMBINATION METER