Speed Signal Circuit

WIPER AND WASHER: WIPER AND WASHER SYSTEM: Speed Signal Circuit

Speed Signal Circuit

DESCRIPTION

This circuit sends a signal to the Multiplex Network Body ECU, and then the signal is converted into BEAN signal. Multiplex Network Body ECU sends this signal to each ECU in the multiplex communication circuit. If the Multiplex Network Body ECU No. 2 cannot receive this signal, Multiplex Network Body ECU No. 2 conducts the LO function instead of the vehicle switching function control (wiper system).

WIRING DIAGRAM





INSPECTION PROCEDURE

PROCEDURE

1. CHECK COMBINATION METER ASSEMBLY
(a) Turn the ignition switch to ON.
(b) Check that speedometer function is normal.
Standard:
Speedometer function is normal.
NG -- GO TO COMBINATION METER SYSTEM
OK -- Continue to next step.
2. INSPECT INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY (BODY ECU)
(a) Disconnect the connector from the instrument panel J/B assembly (driver side J/B assembly).





(b) Turn the ignition switch to ON.





(c) Measure the voltage between terminal SPD and body ground.
Standard voltage:
Voltage is generated intermittently.
OK -- PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE
NG -- Continue to next step.
3. CHECK HARNESS AND CONNECTOR
(a) Check for open and short circuit in the harness and the connector between the instrument panel J/B assembly (driver side J/B assembly) and the combination meter.
NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- GO TO COMBINATION METER SYSTEM