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Inspection Procedure 7: Auto light control function does not work.
 
 
cautionBefore replacing the ECU, ensure that the power supply circuit, the ground circuit and the communication circuit are normal.
 
 
TECHNICAL DESCRIPTION (COMMENT)
If the auto light control function does not work, there may be a malfunction of the HUD.
 
 
 
TROUBLESHOOTING HINTS
  • The HUD may be defective
 
 
 
DIAGNOSIS
Retest the system
Check whether the auto light control function is normal.
(1) Set the combiner to the OPEN state. (After starting the engine or turning the ignition switch ON, operate the HUD ON/OFF switch.)
(2) Cover the illuminance sensor section by hand.
OK: Darkens (Combiner display area)
(3) Remove the hand from the covered illuminance sensor section.
OK: Brightens (Combiner display area)
Is the check result normal?
The trouble can be an intermittent malfunction (Refer to GROUP 00 - How to use Troubleshooting/inspection Service Points - How to Cope with Intermittent Malfunction ).
Replace the HUD.