B15C2

NAVIGATION / MULTI INFO DISPLAY: NAVIGATION SYSTEM: B15C2: Speed Signal Malfunction

DTC B15C2 - Speed Signal Malfunction

DESCRIPTION

The navigation receiver assembly receives a vehicle speed signal from the combination meter assembly and information about the GPS antenna, and then adjusts vehicle position.
The navigation receiver assembly stores this DTC when the difference between the speed information that the GPS antenna receives 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 the respective systems 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 1AR-FE





2. for 2GR-FE





INSPECTION PROCEDURE

PROCEDURE

1. CHECK VEHICLE SENSOR (OPERATION CHECK)




(a) Enter the "Check GPS & Vehicle Sensor" (Vehicle Sensors) Operation Check.
(b) While driving the vehicle, compare the "SPD" indicator to the reading on the speedometer. Check if these readings are almost equal.
OK:
The readings are almost equal.

NG -- INSPECT COMBINATION METER ASSEMBLY (OUTPUT WAVEFORM)
OK -- REPLACE NAVIGATION RECEIVER ASSEMBLY
2. INSPECT COMBINATION METER ASSEMBLY (OUTPUT WAVEFORM)




(a) Check the input waveform.
(1) Reconnect the E1 combination meter assembly connector.
(2) Remove the combination meter assembly with the connector(s) still connected.
(3) Connect an oscilloscope to terminal E1-16 (+S) and body ground.
(4) Turn the ignition switch to ON.
(5) Turn the wheel slowly.
(6) Check the signal waveform according to the condition(s) in the table below.





Text in Illustration





OK:
The waveform is displayed as 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.

NG -- GO TO METER / GAUGE SYSTEM
OK -- Continue to next step.

3. CHECK HARNESS AND CONNECTOR (NAVIGATION RECEIVER ASSEMBLY - COMBINATION METER ASSEMBLY)




(a) Disconnect the E16 navigation receiver assembly connector.




(b) Disconnect the E1 combination meter assembly connector.
(c) Measure the resistance according to the value(s) in the table below.
Standard Resistance:





Text in Illustration





NG -- CHECK HARNESS AND CONNECTOR (NAVIGATION RECEIVER ASSEMBLY - NO. 1 JUNCTION CONNECTOR)
OK -- REPLACE NAVIGATION RECEIVER ASSEMBLY
4. CHECK HARNESS AND CONNECTOR (NAVIGATION RECEIVER ASSEMBLY - NO. 1 JUNCTION CONNECTOR)




(a) Disconnect the E16 navigation receiver assembly connector.




(b) Disconnect the E31 No. 1 junction block connector.
(c) Measure the resistance according to the value(s) in the table below.
Standard Resistance:





Text in Illustration





NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR (NAVIGATION RECEIVER ASSEMBLY - NO. 1 JUNCTION CONNECTOR)
OK -- REPAIR OR REPLACE HARNESS OR CONNECTOR (NO. 1 JUNCTION BLOCK)