Headlight Leveling ECU Power Source Circuit [09/2014 - ]: Procedure
- READ VALUE USING TECHSTREAM
- Connect the Techstream to the DLC3.
- Turn the ignition switch to ON.
- 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 +B IG power supply voltage value / 0 to 19.75 V 11 to 14 V - OK
Normal condition listed above is displayed.
NG → See step 2
OK → See step 5
- CHECK HARNESS AND CONNECTOR (BATTERY - HEADLIGHT LEVELING ECU ASSEMBLY)
- Disconnect the A34 headlight leveling ECU assembly connector.
- Measure the voltage according to the value(s) in the table below.
Standard Voltage
Tester Connection Condition Specified Condition A34-1 (IG) - Body ground Ignition switch ON 11 to 14 V A34-1 (IG) - Body ground Ignition switch off Below 1 V
NG → REPAIR OR REPLACE HARNESS OR CONNECTOR
OK: Go to next step
- CHECK HARNESS AND CONNECTOR (HEADLIGHT LEVELING ECU ASSEMBLY - BODY GROUND)
- Measure the resistance according to the value(s) in the table below.
Standard Resistance
Tester Connection Condition Specified Condition A34-9 (E1) - Body ground Always Below 1 Ω
NG → REPAIR OR REPLACE HARNESS OR CONNECTOR
OK → See step 4
- Measure the resistance according to the value(s) in the table below.
- REPLACE HEADLIGHT LEVELING ECU ASSEMBLY. Refer to REMOVAL [09/2014 - ]
- PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE. Refer to PROBLEM SYMPTOMS TABLE [09/2014 - ]