Lighting System - Headlight Leveling Ecu Power Source Circuit
DESCRIPTION
WIRING DIAGRAM
INSPECTION PROCEDURE
CHECK VEHICLE TYPE
READ VALUE USING INTELLIGENT TESTER (IGNITION POWER SUPPLY)
CHECK HARNESS AND CONNECTOR (HEADLIGHT LEVELING ECU ASSEMBLY - BATTERY AND BODY GROUND)
READ VALUE USING INTELLIGENT TESTER (IGNITION POWER SUPPLY)
CHECK HARNESS AND CONNECTOR (HEADLIGHT SWIVEL ECU ASSEMBLY - BATTERY AND BODY GROUND)
LIGHTING SYSTEM - Headlight Leveling ECU Power Source Circuit
DESCRIPTION
This circuit detects the state of the ignition switch, and sends it to the headlight leveling ECU*1 or headlight swivel ECU*2.
*1: w/ Static Headlight Auto Leveling
*2: w/ Dynamic Headlight Auto Leveling
WIRING DIAGRAM
INSPECTION PROCEDURE
Inspect the fuses for circuits related to this system before performing the following inspection procedure.
After replacing the headlight leveling ECU*1 or headlight swivel ECU*2, initialization of the ECU is necessary (except w/ Dynamic Headlight Auto Leveling) ().
*1: w/ Static Headlight Auto Leveling
*2: w/ Dynamic Headlight Auto Leveling
Check the vehicle type.
Result| Result | Proceed to |
| w/ Static Headlight Auto Leveling | A |
| w/ Dynamic Headlight Auto Leveling | B |
| 2.READ VALUE USING INTELLIGENT TESTER (IGNITION POWER SUPPLY) |
Using the intelligent tester, read the Data List ().
HL Auto Leveling| Tester Display | Measurement Item/Range | Normal Condition | Diagnostic Note |
| +B | Ignition power supply voltage value / 0 to 19.75 V | 11 to 14 V | - |
- OK:
- The display is as specified in the normal condition column.
| OK | |
| |
| PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE ()
|
|
| 3.CHECK HARNESS AND CONNECTOR (HEADLIGHT LEVELING ECU ASSEMBLY - BATTERY AND BODY GROUND) |
Disconnect the headlight leveling ECU connector.
Measure the voltage according to the value(s) in the table below.
- Standard Voltage:
| Tester Connection | Switch Condition | Specified Condition |
| E109-1 (IG) - Body ground | Ignition switch ON | 11 to 14 V |
| Ignition switch off | Below 1 V |
Measure the resistance according to the value(s) in the table below.
- Standard Resistance:
| Tester Connection | Condition | Specified Condition |
| E109-9 (E1) - Body ground | Always | Below 1 Ω |
Text in Illustration| *a | Front view of wire harness connector
(to Headlight Leveling ECU Assembly) |
| | REPAIR OR REPLACE HARNESS OR CONNECTOR |
|
|
| OK | |
| |
| REPLACE HEADLIGHT LEVELING ECU ASSEMBLY ()
|
|
| 4.READ VALUE USING INTELLIGENT TESTER (IGNITION POWER SUPPLY) |
Using the intelligent tester, read the Data List ().
AFS| Tester Display | Measurement Item/Range | Normal Condition | Diagnostic Note |
| +B | Ignition power supply voltage value / 0 to 19.75 V | 11 to 14 V | - |
- OK:
- The display is as specified in the normal condition column.
| OK | |
| |
| PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE ()
|
|
| 5.CHECK HARNESS AND CONNECTOR (HEADLIGHT SWIVEL ECU ASSEMBLY - BATTERY AND BODY GROUND) |
Disconnect the headlight leveling ECU connector.
Measure the voltage according to the value(s) in the table below.
- Standard Voltage:
| Tester Connection | Switch Condition | Specified Condition |
| E101-15 (IG) - Body ground | Ignition switch ON | 11 to 14 V |
| Ignition switch off | Below 1 V |
Measure the resistance according to the value(s) in the table below.
- Standard Resistance:
| Tester Connection | Condition | Specified Condition |
| E101-22 (E1) - Body ground | Always | Below 1 Ω |
Text in Illustration| *a | Front view of wire harness connector
(to Headlight Swivel ECU Assembly) |
Result| Result | Proceed to |
| OK (for LHD) | A |
| OK (for RHD) | B |
| NG | C |
| | REPLACE HEADLIGHT SWIVEL ECU ASSEMBLY ()
|
|
|
| | REPAIR OR REPLACE HARNESS OR CONNECTOR |
|
|
| A | |
| |
| REPLACE HEADLIGHT SWIVEL ECU ASSEMBLY ()
|
|
