DESCRIPTION The navigation
ECU receives a vehicle speed signal from the combination meter assembly
and information from the navigation antenna assembly, and then adjusts
the vehicle position on the map. The navigation
ECU stores this DTC when the difference between the speed information
that the navigation antenna assembly 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 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.
|
DTC No. | Detection Item |
DTC Detection Condition | Trouble Area | |
B15C2 | Speed Signal Malfunction |
A difference between the GPS speed and SPD pulse is detected |
- Meter / gauge system
- Navigation ECU
- Radio and display receiver assembly
- Harness or connector
| WIRING DIAGRAM
 CAUTION / NOTICE / HINT
NOTICE:
- Depending on the parts that are replaced during vehicle inspection or
maintenance, performing initialization, registration or calibration may
be needed. Refer to Precaution for Navigation System.
Click here 
- When replacing the radio and display receiver assembly or navigation
ECU, always replace it with a new one. If a radio and display receiver
assembly or navigation ECU which was installed to another vehicle is
used, the following may occur:
- A communication malfunction DTC may be stored.
- The radio and display receiver assembly or navigation ECU may not operate normally.
PROCEDURE (a) Clear the DTCs. Body Electrical > Navigation System > Clear DTCs
(b) Recheck for DTCs and check that no DTCs are output. Body Electrical > Navigation System > Trouble Codes
OK: No DTCs are output.
| OK |  |
USE SIMULATION METHOD TO CHECK |
|
NG |
 | |
| 2. |
CHECK VEHICLE SENSOR (OPERATION CHECK) |
| (a) Enter the "System Sensors Check" screen. Refer to Check GPS & Vehicle Sensors in Operation Check.
Click here | |
(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
procedure inspection referring to values in 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. Click here
| OK | |
GO TO STEP 5 |
|
NG | |
| |
| 3. |
CHECK 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 G16-6 (+S) and body ground.
(3) Turn the engine switch on (IG). (4) Turn a wheel slowly.
(5) Check the signal waveform according to the condition(s) in the table below. |
Item | Condition | |
Measurement terminal |
G16-6 (+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. |
 |
|
*a | Component with harness connected
(Combination Meter Assembly) | | |
| NG |
| GO TO METER / GAUGE SYSTEM |
|
OK | |
| |
| 4. |
CHECK HARNESS AND CONNECTOR (NAVIGATION ECU - COMBINATION METER ASSEMBLY) |
(a) Disconnect the G13 navigation ECU connector. (b) Disconnect the G16 combination meter assembly connector.
(c) Measure the resistance according to the value(s) in the table below.
Standard Resistance: |
Tester Connection | Condition |
Specified Condition | |
G13-9 (SPD) - G16-6 (+S) |
Always | Below 1 Ω | |
G13-9 (SPD) or G16-6 (+S) - Body ground |
Always | 10 kΩ or higher |
| NG |
| REPAIR OR REPLACE HARNESS OR CONNECTOR |
|
OK | |
| |
| 5. |
REPLACE NAVIGATION ECU | (a) Replace the navigation ECU with a new one.
Click here
|
NEXT | |
| |
(a) Clear the DTCs. Body Electrical > Navigation System > Clear DTCs
(b) Recheck for DTCs and check that no DTCs are output. Body Electrical > Navigation System > Trouble Codes
OK: No DTCs are output.
| OK | |
END (NAVIGATION ECU IS DEFECTIVE) |
| NG |
| REPLACE RADIO AND DISPLAY RECEIVER ASSEMBLY | | 
