Main Switch Circuit

DESCRIPTION

The meter mirror sub-assembly is connected to the combination switch assembly (headup display switch) via a direct line. As a result, the meter mirror sub-assembly can be turned on and off by operation of the combination switch assembly (headup display switch).

WIRING DIAGRAM

PROCEDURE

READ VALUE USING GTS (MAIN SW)

Using the GTS, read the Data List.

Headup Display
Tester Display	Test Part	Control Range	Diagnostic Note
Main Switch	Headup display main switch state / ON or OFF	ON: Switch pressed OFF: Switch released	-

OK
On the GTS screen, ON or OFF is displayed accordingly.

NG

REPLACE METER MIRROR SUB-ASSEMBLY Click here

OK

INSPECT COMBINATION SWITCH ASSEMBLY (HEADUP DISPLAY SWITCH)
1. Remove the combination switch assembly (headup display switch) Click here.
2. Inspect the combination switch assembly (headup display switch) Click here.
NG
REPLACE COMBINATION SWITCH ASSEMBLY (HEADUP DISPLAY SWITCH) Click here

OK

CHECK HARNESS AND CONNECTOR (METER MIRROR SUB-ASSEMBLY - COMBINATION SWITCH ASSEMBLY [HEADUP DISPLAY SWITCH])

Disconnect the E147 meter mirror sub-assembly connector.
Disconnect the E125 combination switch assembly (headup display switch) connector.

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

Standard Resistance

for LHD:
Tester Connection	Condition	Specified Condition
E147-9 (SW1) - E125-5 (ILU)	Always	Below 1 Ω
E147-16 (E) - E125-15 (CH)	Always	Below 1 Ω
E147-9 (SW1) or E125-5 (ILU) - Body ground	Always	10 kΩ or higher
E147-16 (E) or E125-15 (CH) - Body ground	Always	10 kΩ or higher

for RHD:
Tester Connection	Condition	Specified Condition
E147-9 (SW1) - E125-4 (ILU)	Always	Below 1 Ω
E147-16 (E) - E125-14 (CH)	Always	Below 1 Ω
E147-9 (SW1) or E125-4 (ILU) - Body ground	Always	10 kΩ or higher
E147-16 (E) or E125-14 (CH) - Body ground	Always	10 kΩ or higher

OK

REPLACE METER MIRROR SUB-ASSEMBLY Click here

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

HEADUP DISPLAY SYSTEM Main Switch Circuit