Vehicle Speed Signal Circuit Between Radio and Navigation Assembly and Combination Meter

NAVIGATION: NAVIGATION SYSTEM: Vehicle Speed Signal Circuit between Radio and Navigation Assembly and Combination Meter

Vehicle Speed Signal Circuit between Radio and Navigation Assembly and Combination Meter

DESCRIPTION

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

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 the 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, all systems in the diagram below will not operate normally.

WIRING DIAGRAM





INSPECTION PROCEDURE

PROCEDURE

1. CHECK COMBINATION METER SYSTEM
(a) Inspect the circuits that send vehicle signals to the combination meter system Speed Signal Circuit.
(b) During the inspection, if there is an instruction that indicates to go back to inspections for each system, proceed to the next step.
NEXT -- Continue to next step.
2. CHECK HARNESS AND CONNECTOR (RADIO AND NAVIGATION ASSEMBLY - COMBINATION METER)




(a) Disconnect radio and navigation assembly connector F13 and combination meter connector F2.
(b) Measure the resistance according to the value(s) in the table below.
Standard resistance:






NG -- CHECK HARNESS AND CONNECTOR (RADIO AND NAVIGATION ASSEMBLY - NO. 3 JUNCTION BLOCK)
OK -- REPLACE RADIO AND NAVIGATION ASSEMBLY
3. CHECK HARNESS AND CONNECTOR (RADIO AND NAVIGATION ASSEMBLY - NO. 3 JUNCTION BLOCK)
(a) Disconnect the No. 3 junction block connector.





Standard resistance:






NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR (RADIO AND NAVIGATION ASSEMBLY - NO. 3 JUNCTION BLOCK)
OK -- REPAIR OR REPLACE HARNESS OR CONNECTOR (NO. 3 JUNCTION BLOCK)