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 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.
| DTC Code |
DTC Detection Condition | Trouble Area | |
B15C2 | A difference between the GPS speed and SPD pulse is detected. |
- Meter/gauge system
- Harness or connector
- Navigation receiver assembly
| WIRING DIAGRAM
 PROCEDURE
| 1. |
CHECK VEHICLE SENSOR (OPERATION CHECK) |
| (a) Enter the "System Sensors Check" screen. Refer to Check GPS & Vehicle Sensors in Operation Check (See page
 ). | |
(b)
While driving the vehicle, compare the "Speed" indicator to the reading
on the speedometer. Check if these readings are almost equal. OK:
The readings are equal or almost equal. Result |
Result | Proceed to | |
OK (for Column Shift Type) |
A | | OK (for Floor Shift Type) |
B | | NG |
C |
| A |
 | REPLACE NAVIGATION RECEIVER ASSEMBLY |
| B |
| REPLACE NAVIGATION RECEIVER ASSEMBLY |
|
C |
 | |
| 2. |
CHECK COMBINATION METER ASSEMBLY (OUTPUT WAVEFORM) |
| (a) Check the output waveform. (1) Remove the combination meter assembly with the connector(s) still connected (See page
). (2) Connect an oscilloscope to terminal J28-29 (+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 |
J28-29 (+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. |
CHECK HARNESS AND CONNECTOR (NAVIGATION RECEIVER ASSEMBLY - COMBINATION METER ASSEMBLY) |
(a) Disconnect the J135 navigation receiver assembly connector. (b) Disconnect the J28 combination meter assembly connector.
(c) Measure the resistance according to the value(s) in the table below.
Standard Resistance: |
Tester Connection | Condition |
Specified Condition | | J135-17 (SPD) - J28-29 (+S) |
Always | Below 1 Ω | Result |
Result | Proceed to | |
OK (for Column Shift Type) |
A | | OK (for Floor Shift Type) |
B | | NG |
C |
| A |
| REPLACE NAVIGATION RECEIVER ASSEMBLY |
| B |
| REPLACE NAVIGATION RECEIVER ASSEMBLY |
| C |
| REPAIR OR REPLACE HARNESS OR CONNECTOR | | 
