NO.5 DISPLAY SCREEN DOES NOT CHANGE TO THE NIGHT MODE [CAR-NAVIGATION SYSTEM]

id0903e8833800

5 | Does not switch to the night screen even though the light switch is in the TNS position.
--- | ---
Possible DTC | —
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 1G. • 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.)