Inspection Procedure

WARNING: This page is about a different car, the 2008 Lexus RX 350. 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 in 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 COMBINATION METER SYSTEM

OK: Go to Next Step
INSPECT MULTI-DISPLAY
1. Disconnect the multi-display connector M5.
  
  Fig 1: Identifying Multi-Display Connector Terminals
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
2. Measure voltage.
  1. Jack up either one of the drive wheels.
  2. Move the shift lever to the neutral position.
  3. Turn the ignition switch to the ON position.
  4. Measure the voltage between terminal SPD of the wire harness connector and body ground when the drive wheels are turned slowly.
    
    Fig 2: Identifying SPD Voltage Graph
    Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    
    OK:
    
    Voltage pulses as shown in the illustration:
OK: REPLACE MULTI-DISPLAY

NG: Go to Next Step

CHECK HARNESS AND CONNECTOR (COMBINATION METER - MULTI-DISPLAY)

Disconnect the multi-display connector M5 and combination meter connector C8.

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

Standard resistance

TESTER CONNECTION SPECIFIED CONDITION REFERENCE TABLE

Tester connection	Condition	Specified condition
SPD - C8-6	Ignition switch off	Below 1 Ω

Fig 3: Identifying Multi-Display & Combination Meter Connector Terminals

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

NG: REPAIR OR REPLACE HARNESS OR CONNECTOR

OK: Go to Next Step

CHECK HARNESS AND CONNECTOR (MULTI-DISPLAY - BODY GROUND)

Disconnect the multi-display connector M5.

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

Standard resistance

TESTER CONNECTION SPECIFIED CONDITION REFERENCE TABLE

Tester connection	Condition	Specified condition
SPD - Body ground	Ignition switch off	10 kΩ or higher

Fig 4: Identifying Multi-Display Connector Terminals

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.

NG: REPAIR OR REPLACE HARNESS OR CONNECTOR OR EACH ECU

OK: REPLACE COMBINATION METER