Power Source Circuit

OTHER SYSTEM: CLOCK: Power Source Circuit

Power Source Circuit

DESCRIPTION

This circuit is the power source for the clock assembly. This circuit provides two types of power sources; one is a constant power source mainly used as a backup power source, and the other is a power source mainly used for signal transmission. The constant power source is mainly used as a backup power source of the clock assembly, however, it is also used for communication.
HINT: If the clock assembly displays "1:00" when the engine switch is turned off, then on (IG) again, the +B (*1)/B (*2) terminal has a malfunction.
The maximum clock assembly margin of error is -4 to 4 seconds per day when the temperature is between -20°C (-4°F) and 60°C (140°F).

WIRING DIAGRAM





INSPECTION PROCEDURE

PROCEDURE

1. CHECK HARNESS AND CONNECTOR




(a) Disconnect the E3 (*1)/E18 (*2) connector.
(b) Measure the voltage according to the value(s) in the table below.
Standard voltage:





*1: without Navigation System
*2: with Navigation System

(c) Measure the resistance according to the value(s) in the table below.
Standard resistance:





*1: without Navigation System
*2: with Navigation System

Result:





HINT: The whole heater control panel (*1)/multi-display should be replaced if the clock assembly has a malfunction because this part is not independently supplied.

C -- REPAIR OR REPLACE HARNESS OR CONNECTOR
B -- REPLACE MULTI-DISPLAY
A -- REPLACE HEATER CONTROL PANEL