Vehicle Speed Signal Circuit Between Navigation Receiver Assembly and Combination Meter

NAVIGATION SYSTEM (for Double Cab): Vehicle Speed Signal Circuit between Navigation Receiver Assembly and Combination Meter

Vehicle Speed Signal Circuit between Navigation Receiver Assembly and Combination Meter

DESCRIPTION

This circuit sends a speed signal from the combination meter to the navigation receiver.

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

WIRING DIAGRAM





INSPECTION PROCEDURE

PROCEDURE

1. CHECK OPERATION OF SPEEDOMETER
(a) Drive the vehicle and check if the function of the speedometer in the combination meter is normal.
OK:
Actual vehicle speed and the speed indicated on the speedometer are the same.

HINT: The vehicle speed sensor is functioning normally when the indication on the speedometer is normal.

NG -- GO TO METER / GAUGE SYSTEM
OK -- Continue to next step.
2. CHECK HARNESS AND CONNECTOR (NAVIGATION RECEIVER - COMBINATION METER)





(a) Disconnect the K6 receiver connector.
(b) Disconnect the J28 meter connector.
(c) Measure the resistance according to the value(s) in the table below.
Standard resistance:





Result





C -- REPAIR OR REPLACE HARNESS OR CONNECTOR
B -- REPLACE NAVIGATION RECEIVER
A -- REPLACE NAVIGATION RECEIVER