Headlight Signal Circuit: Procedure
WARNING: This page is about a different variant/trim than selected.
- READ VALUE USING TECHSTREAM
- Connect the Techstream to the DLC3.
- Turn the power switch on (IG).
- Turn the Techstream on.
- Enter the following menus: Body Electrical / HL Auto Leveling / Data List.
- Read the display on the Techstream.HL AUTO LEVELING
Tester Display Measurement Item/Range Normal Condition Diagnostic Note Lo Beam St Low beam headlight state/ON or OFF ON: Low beam headlights on
OFF: Low beam headlights off- OK
Normal conditions listed above are displayed.
NG → See step 2
OK → See step 3
- CHECK HARNESS AND CONNECTOR (INTEGRATION RELAY - ECU)
- Disconnect the A48 headlight leveling ECU assembly connector.
- Measure the voltage according to the value(s) in the table below.
Standard Voltage
Tester Connection Switch Condition Specified Condition A48-3 (HDLP) - Body ground Light control switch in head position 11 to 14 V TEXT IN ILLUSTRATION*1 Front view of wire harness connector
(to Headlight Leveling ECU Assembly)
NG → REPAIR OR REPLACE HARNESS OR CONNECTOR
OK → See step 4
- PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE. Refer to PROBLEM SYMPTOMS TABLE
- REPLACE HEADLIGHT LEVELING ECU ASSEMBLY. Refer to REMOVAL