DISPLAY SCREEN DOES NOT CHANGE TO THE NIGHT MODE [CAR-NAVIGATION SYSTEM]

id0903e8100400

Possible DTC

Does not switch to the night screen even though the light switch is in the TNS position.

POSSIBLE CAUSE

•  Car-navigation unit malfunction

•  TNS signal malfunction

―  Open, short circuit in car-navigation unit terminal 1E

Possible DTC	Does not switch to the night screen even though the light switch is in the TNS position.
POSSIBLE CAUSE	• Car-navigation unit malfunction • TNS signal malfunction ― Open, short circuit in car-navigation unit terminal 1E

Diagnostic Procedure

Step

Inspection

Action

1

VERIFY TNS SIGNAL

•  Launch the audio unit diagnostic assist function.
(See DIAGNOSTIC ASSIST FUNCTION [AUDIO].)

•  Select diagnostic assist code 15 vehicle NAVI signal verification.

•  Does the TNS display OFF?

Yes

Go to the next step.

No

Go to Step 3.

2

INSPECT TNS SIGNAL

•  Measure the terminal voltage at audio unit connector (24-pin) terminal 1E.

•  Is the voltage normal?
Specification

TNS ON: Approx. 12. V

TNS OFF: Approx. 0 V

Yes

Go to the next step.

No

Inspect the applicable (TNS signal system) vehicle panel and repair or replace.

3

VERIFY IF SYSTEM SWITCHES TO NIGHT SCREEN

•  Turn the light switch to the TNS position.

•  Does the audio unit screen switch to the night screen?

Yes

System is normal.

No

Replace the audio unit.

(See AUDIO UNIT REMOVAL/INSTALLATION.)

Step	Inspection		Action
1	VERIFY TNS SIGNAL • Launch the audio unit diagnostic assist function. (See DIAGNOSTIC ASSIST FUNCTION [AUDIO].) • Select diagnostic assist code 15 vehicle NAVI signal verification. • Does the TNS display OFF?	Yes	Go to the next step.
1		No	Go to Step 3.
2	INSPECT TNS SIGNAL • Measure the terminal voltage at audio unit connector (24-pin) terminal 1E. • Is the voltage normal? Specification TNS ON: Approx. 12. V TNS OFF: Approx. 0 V	Yes	Go to the next step.
2		No	Inspect the applicable (TNS signal system) vehicle panel and repair or replace.
3	VERIFY IF SYSTEM SWITCHES TO NIGHT SCREEN • Turn the light switch to the TNS position. • Does the audio unit screen switch to the night screen?	Yes	System is normal.
3		No	Replace the audio unit. (See AUDIO UNIT REMOVAL/INSTALLATION.)