Toyota Venza manuals

Toyota Venza: Vehicle Speed Signal Circuit between Radio Receiver and Combination Meter

Toyota Venza Service Manual / Audio / Video / Audio And Visual System / Vehicle Speed Signal Circuit between Radio Receiver and Combination Meter

DESCRIPTION

for Automatic Sound Levelizer (ASL):
  • This circuit is necessary for the Automatic Sound Levelizer (ASL) built into the radio and display receiver assembly.

    The Automatic Sound Levelizer (ASL) function automatically adjusts the audio system volume level in order to compensate for increased vehicle noise (vehicle noise tends to increase as vehicle speed increases). The ASL adjusts the volume level based on vehicle speed signals sent from the combination meter assembly.

for "Bluetooth":
  • Vehicle speed signals are sent from the combination meter assembly and used to cancel "Bluetooth" function operation.

    The radio and display receiver assembly recognizes that the vehicle is being driven and makes it impossible to connect or register a "Bluetooth" device while driving.

HINT:

  • A voltage of 12 V or 5 V is output from each ECU and then input to the combination meter assembly. The signal is changed to a pulse signal at the transistor in the combination meter assembly. Each ECU controls its respective system based on this pulse signal.
  • If a short occurs in any of the ECUs or in the wire harness connected to an ECU, all systems in the following diagram will not operate normally.

WIRING DIAGRAM

1. for 2GR-FE


2. for 1AR-FE


PROCEDURE

1.

CHECK VEHICLE SIGNAL (OPERATION CHECK)

(a) Enter the "Vehicle Signal Check Mode" screen. Refer to Check Vehicle Signal in Operation Check (See page ).



(b) While driving the vehicle, compare the value displayed for "SPEED" to the reading on the speedometer. Check if these readings are almost equal.

HINT:

The combination meter assembly receives the vehicle speed signal from the skid control ECU via CAN communication. Therefore, perform the following inspection referring to values on the Data List of the skid control ECU because it is the source of the vehicle speed signal.

OK:

Vehicle speed displayed on the "Vehicle Signal Check Mode" screen is almost the same as the actual vehicle speed measured using the Techstream (See page ).



OK

PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE


NG

2.

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) Turn a wheel slowly.

(5) Check the signal waveform according to the condition(s) in the table below.

Item

Condition

Measurement terminal

E1-16 (+S) - Body ground

Tool setting

5 V/DIV., 20 ms./DIV.

Vehicle condition

Wheel being rotated

OK:

The waveform is similar to that shown in the 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.

Text in Illustration

*a

Component with harness connected

(Combination Meter Assembly)



NG

GO TO METER / GAUGE SYSTEM


OK

3.

INSPECT RADIO AND DISPLAY RECEIVER ASSEMBLY (INPUT WAVEFORM)

(a) Check the input waveform.



(1) Remove the radio and display receiver assembly with the connector still connected.

(2) Connect an oscilloscope to terminal E42-17 (SPD) and body ground.

(3) Turn the ignition switch to on.

(4) Turn a wheel slowly.

(5) Check the signal waveform according to the condition(s) in the table below.

Item

Condition

Measurement terminal

E42-17 (SPD) - Body ground

Tool setting

5 V/DIV., 20 ms./DIV.

Vehicle condition

Wheel being rotated

OK:

The waveform is similar to that shown in the 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.

Text in Illustration

*a

Component with harness connected

(Radio and Display Receiver Assembly)


OK

REPLACE RADIO AND DISPLAY RECEIVER ASSEMBLY


NG

4.

CHECK HARNESS AND CONNECTOR (RADIO AND DISPLAY RECEIVER ASSEMBLY - JUNCTION CONNECTOR)

(a) Disconnect the E42 radio and display receiver assembly connector.

(b) Disconnect the E31 junction connector.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

E42-17 (SPD) - E31-20

Always

Below 1 Ω


NG

REPAIR OR REPLACE HARNESS OR CONNECTOR


OK

5.

CHECK HARNESS AND CONNECTOR (COMBINATION METER ASSEMBLY - JUNCTION CONNECTOR)

(a) Disconnect the E1 combination meter assembly connector.

(b) Disconnect the E31 junction connector.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

E1-16 (+S) - E31-19

Always

Below 1 Ω


OK

REPAIR OR REPLACE HARNESS OR CONNECTOR (JUNCTION CONNECTOR)


NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

USB Audio System Recognition/Play Error
DESCRIPTION When a USB device or "iPod" is connected to the USB jack of the No. 1 stereo jack adapter assembly, it must have playable files. The device must also communicate with and be ...

Steering Pad Switch Circuit
DESCRIPTION This circuit sends an operation signal from the steering pad switch assembly to the radio and display receiver assembly. If there is an open in the circuit, the audio system cannot be ...

Other materials about Toyota Venza:

Air Conditioning Compressor Magnetic Clutch Circuit
DESCRIPTION When the A/C amplifier is turned on, a magnetic clutch ON signal is sent from the MGC terminal of the A/C amplifier. Then, the MGC relay turns on to operate the magnetic clutch. WIRING DIAGRAM CAUTION / NOTICE / HINT NOTICE: Inspect the ...

Removal
REMOVAL CAUTION / NOTICE / HINT HINT: Use the same procedure for the RH side and LH side. The procedure listed below is for the LH side. PROCEDURE 1. PRECAUTION CAUTION: Be sure to read Precaution thoroughly before servicing (See page ...

Back Door Motor Clutch Malfunction (B2225)
DESCRIPTION When an electrical malfunction (open or short) is detected in the clutch circuit of the power back door ECU (power back door motor unit) while the power back door is operating, the power back door ECU (power back door motor unit) stores DTC B2 ...

© 2016-2019 Copyright www.tovenza.com

0.2275