Toyota Venza: Speed Signal Circuit
DESCRIPTION
The headlight leveling ECU assembly receives the vehicle speed signal from the combination meter assembly.
HINT:
- 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 any of the ECUs or in the wire harness connected to an ECU, all systems in the diagram below will not operate normally.
WIRING DIAGRAM
1. for 2GR-FE
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2. for 1AR-FE
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PROCEDURE
|
1. |
CHECK COMBINATION METER SYSTEM |
(a) The circuits that send vehicle speed signals to this system are inspected
in the meter section (See page .gif)
).
(b) During inspection for the meter system, if there is an instruction that indicates to go back to inspections for the lighting system, proceed to the next step.
|
.gif)
|
2. |
CHECK HARNESS AND CONNECTOR (HEADLIGHT LEVELING ECU ASSEMBLY - COMBINATION METER ASSEMBLY) |
|
(a) Disconnect the E1 combination meter assembly connector. |
|
(b) Disconnect the A40 headlight leveling ECU assembly connector.
(c) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
|
Tester Connection |
Condition |
Specified Condition |
|---|---|---|
|
A40-16 (SPDR) - E1-16 (+S) |
Always |
Below 1 Ω |
|
*1 |
Front view of wire harness connector (to Combination Meter Assembly) |
|
*2 |
Front view of wire harness connector (to Headlight Leveling ECU Assembly) |
| NG | .gif) |
REPAIR OR REPLACE HARNESS OR CONNECTOR (WIPER RELAY - COMBINATION METER) |
|
|
3. |
INSPECT COMBINATION METER ASSEMBLY (OUTPUT WAVEFORM) |
|
(a) Check the output waveform. (1) Remove the combination meter assembly with the connector still connected. (2) Connect an oscilloscope to terminal E1-16 (+S) and body ground. (3) Turn the ignition switch to ON. (4) Check the signal waveform according to the condition(s) in the table below.
OK: The waveform is displayed as shown in the illustration. Text in Illustration
HINT: When the system is functioning normally, one wheel revolution generates 4 pulses. As the vehicle speed increases, the width indicated by (A) in the illustration narrows. |
|
.png)
| OK | |
PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE |
| NG | |
REPLACE COMBINATION METER ASSEMBLY |
Indicator Circuit
DESCRIPTION
The headlight beam level control system indicator light in the combination meter
assembly comes on for approximately 3 seconds when the ignition switch is turned
to ON. The indicator ...
Inner Rear View Mirror Power Source Circuit
DESCRIPTION
This circuit detects the state of the ignition switch, and sends it to the inner
rear view mirror assembly.
WIRING DIAGRAM
CAUTION / NOTICE / HINT
NOTICE:
Inspect the fuses for ci ...
Other materials about Toyota Venza:
Seat Position Sensor
Components
COMPONENTS
ILLUSTRATION
On-vehicle Inspection
ON-VEHICLE INSPECTION
CAUTION / NOTICE / HINT
CAUTION:
Be sure to follow the correct removal and installation procedures of the seat
position sensor.
PROCEDURE
1. INSPECT SEAT POSITION S ...
How To Proceed With Troubleshooting
HOW TO PROCEED WITH TROUBLESHOOTING
1. OPERATION FLOW
HINT:
Perform troubleshooting in accordance with the procedure below. The following
is an outline of basic troubleshooting procedure. Confirm the troubleshooting procedure
for the circuit you are wor ...
Starting the engine
Shift the shift lever to “P” and
apply the brakes.
Touch the Toyota emblem side of the electronic key to the “ENGINE START STOP”
switch.
An alarm will sound to indicate that the start function cannot detect the electronic
key that is touched ...
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