B3659

Head-Up Display Dimming Down Switch Circuit

Severity

⚠️ Medium

Can you drive?

Limited driving only, diagnose soon

Approx. repair cost

$33–167 (est.)

Symptoms

Head-up display does not respond to brightness adjustments
HUD works at fixed brightness
Flashing or spontaneous change in display brightness

Causes

Open or short circuit in wiring harness
Oxidation of switch contacts
Dimmer switch malfunction
Problems with the HUD control unit

How to Fix

Check the integrity of the wiring harness to the switch
Clean the switch contacts from oxides
Check the functionality of the switch
Scan the HUD control unit for additional errors
If necessary, replace the switch or repair the harness

Related codes

B3660 B3661 U0155