Toyota Venza: Speed Signal Malfunction (B15C2)

Toyota Venza Service Manual / Navigation / Multi Info Display / Navigation System / Speed Signal Malfunction (B15C2)

DESCRIPTION

The navigation receiver assembly receives a vehicle speed signal from the combination meter assembly and information from the navigation antenna assembly, and then adjusts the vehicle position.

The navigation receiver assembly stores this DTC when the difference between the speed information that the navigation antenna assembly and the SPD pulse received from the combination meter assembly becomes large.

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 systems 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.

DTC No.	DTC Detection Condition	Trouble Area
B15C2	A difference between the GPS speed and SPD pulse is detected	Navigation receiver assembly Combination meter assembly Harness or connector Junction connector

WIRING DIAGRAM

1. for 1AR-FE

2. for 2GR-FE

PROCEDURE

1.	CHECK SYSTEM SENSORS (OPERATION CHECK)

(a) Enter the "System Sensors Check" screen.

Refer to Check System Sensors in Operation Check (See page ).

(b) While driving the vehicle, compare the value of "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 "System Sensors Check" screen is almost the same as the actual vehicle speed measured using the Techstream (See page ).

REPLACE NAVIGATION RECEIVER ASSEMBLY

2.	INSPECT COMBINATION METER ASSEMBLY (OUTPUT WAVEFORM)

(a) Check the output waveform.

(1) Remove the combination meter assembly with the connector(s) 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)

GO TO METER / GAUGE SYSTEM

3.	INSPECT NAVIGATION RECEIVER ASSEMBLY (INPUT WAVEFORM)

(a) Check the input waveform.

(1) Remove the navigation receiver assembly with the connector(s) still connected.

(2) Connect an oscilloscope to terminal E40-17 (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	E40-17 (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 (Navigation Receiver Assembly)

REPLACE NAVIGATION RECEIVER ASSEMBLY

4.	CHECK HARNESS AND CONNECTOR (NAVIGATION RECEIVER ASSEMBLY - JUNCTION CONNECTOR)

(a) Disconnect the E40 navigation receiver assembly connector.

(b) Disconnect the E31 junction connector.

Standard Resistance:

Tester Connection	Condition	Specified Condition
E40-17 (SPD) - E31-20	Always	Below 1 Ω

REPAIR OR REPLACE HARNESS OR CONNECTOR

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

(a) Disconnect the E1 combination meter assembly connector.

(b) Disconnect the E31 junction connector.

Standard Resistance:

Tester Connection	Condition	Specified Condition
E1-16 (+S) - E31-19	Always	Below 1 Ω

REPLACE JUNCTION CONNECTOR

REPAIR OR REPLACE HARNESS OR CONNECTOR

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