DESCRIPTION
WIRING DIAGRAM
INSPECTION PROCEDURE
CHECK SPEEDOMETER
INSPECT MULTI-DISPLAY
CHECK HARNESS AND CONNECTOR (COMBINATION METER - MULTI-DISPLAY)
CHECK HARNESS AND CONNECTOR (COMBINATION METER - MULTI-DISPLAY)
NAVIGATION SYSTEM - Vehicle Speed Signal Circuit between Multi-display and Combination Meter
DESCRIPTION
The multi-display performs switch operation control during driving by receiving a vehicle speed signal from the combination meter.
A voltage of 12 V or 5 V is output from each ECU and then input to the combination meter. The signal is changed to a pulse signal at the transistor in the combination meter. Each ECU controls the respective system based on the pulse signal.
If a short occurs in an ECU, all systems in the diagram below will not operate normally.
WIRING DIAGRAM
INSPECTION PROCEDURE
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.
- The vehicle speed sensor is functioning normally when the indication on the speedometer is normal.
| | GO TO COMBINATION METER SYSTEM |
|
|
Disconnect the multi-display connector J50.
Measure voltage.
Jack up either one of the drive wheels.
Move the shift lever to the neutral position.
Turn the engine switch on (IG).
Measure the voltage between terminal SPD of the multi-display and body ground when the drive wheels are turned slowly.
- OK:
- Voltage pulses as shown in the illustration.
| 3.CHECK HARNESS AND CONNECTOR (COMBINATION METER - MULTI-DISPLAY) |
Disconnect the multi-display connector J50 and combination meter connector J34.
Measure the resistance according to the value(s) in the table below.
- Standard resistance:
| Tester connection | Condition | Specified condition |
| SPD - +S | Engine switch off | Below 1 Ω |
| | REPAIR OR REPLACE HARNESS OR CONNECTOR |
|
|
| 4.CHECK HARNESS AND CONNECTOR (COMBINATION METER - MULTI-DISPLAY) |
Disconnect the multi-display connector J50 and combination meter connector J34.
Measure the resistance according to the value(s) in the table below.
- Standard resistance:
| Tester connection | Condition | Specified condition |
| SPD - Body ground | Engine switch off | 10 kΩ or higher |
- 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.
| | REPAIR OR REPLACE HARNESS OR CONNECTOR OR EACH ECU |
|
|
| OK | |
| |
| REPLACE COMBINATION METER |
|
LEXUS IS250, IS220d / GSE20 ALE20
