PROCEDURE
| Step | Check | Yes | No |
|---|
| 1 PERFORM CUSTOMER INTERVIEW. Using the Check List for Interview, ask the customer the condition of how the trouble occurred. < Ref. to CHECK , Check List for Interview. > | Did you interview the customer? | Go to step 2 . | Interview the customer. < Ref. to CHECK , Check List for Interview. > |
| 2 CHECK LAN SYSTEM. Inspect LAN system. < Ref. to PROCEDURE , Basic Diagnostic Procedure. > | Is there any fault? | Perform the inspection according to the diagnosis for LAN system. | Go to step 3 . |
| 3 CHECK AUTO HEADLIGHT BEAM LEVELER SYSTEM. Using the Subaru Select Monitor, read DTC of the auto headlight beam leveler system inspection. < Ref. to OPERATION , Read Diagnostic Trouble Code (DTC). > NOTE: If the communication function of the Subaru Select Monitor cannot be executed properly, check the communication circuit. < Ref. to COMMUNICATION FOR INITIALIZING IMPOSSIBLE , INSPECTION, Subaru Select Monitor. > | Is DTC displayed? | Record DTC and time stamp, and perform the diagnosis according to DTC. < Ref. to LIST , List of Diagnostic Trouble Code (DTC). > NOTE: For time stamp, refer to "LAN SYSTEM". < Ref. to TIME STAMP , CAUTION, General Description. > | Go to step 4 . |
| 4 CHECK DIAGNOSTICS WITH PHENOMENON. Check "Diagnostics with Phenomenon". < Ref. to DIAGNOSTICS WITH PHENOMENON . > | Does the symptom apply? | Perform diagnosis according to the procedures in the diagnostics with phenomenon. | Go to step 5 . |
| 5 CHECK TROUBLE PHENOMENON. Perform the basic inspection and function check. < Ref. to INSPECTION , General Description. > Check the auto headlight beam leveler CM. < Ref. to CONTROL MODULE I/O SIGNAL . > Perform check of current data. < Ref. to READ CURRENT DATA . > Perform a unit check. | Was the trouble cause found? | Repair or replace the cause of trouble. | System is normal. |
| NOTE |
|---|
| If the communication function of the Subaru Select Monitor cannot be executed properly, check the communication circuit. < Ref. to COMMUNICATION FOR INITIALIZING IMPOSSIBLE , INSPECTION, Subaru Select Monitor. > |
| NOTE |
|---|
| For time stamp, refer to "LAN SYSTEM". < Ref. to TIME STAMP , CAUTION, General Description. > |
CHECK
- Inspect the following items regarding the vehicle's state.
- Use the chart below for interviewing customers.
| Auto Headlight Beam Leveler System Check List for Interview Date the Vehicle is Received Year Month Day |
|---|
| Customer's name | Registration No. | Initial year of registration Year Month Date |
| Vehicle model | Frame number |
| Interviewer | Inspector | Engine type | Odometer reading |
| Customer specified content |
| Date and time when the trouble occurred | | Frequency of trouble occurrence | Always occurs Sometimes occurs (times per day, times per month) |
| Condition of trouble occurrence (How the trouble occurs) | | Weather | Fine • Cloudy • Rainy • Snowy • Others () |
| Temperature | °C (°F) - °C (°F) |
| Road conditions | | Occurrence location | |
| Accessory installation condition | |
| Confirmation of trouble condition | |
| Diagnostic code | |
AIRBAG SYSTEM
| CAUTION | Do not use the electrical test equipment on the airbag system wiring harnesses and connector circuits. Be careful not to damage the airbag system wiring harness. |
FUNCTION CHECK
With the ignition switch ON and the lighting switch set at 2 (HEAD), change the vehicle posture while the vehicle is stopped. Check that the beam moves, when the vehicle condition is kept for three seconds or more.
GENERAL TOOL
| TOOL NAME | REMARKS |
|---|
| Circuit tester | Used for measuring resistance, voltage and current. |
Scheme 100
Scheme 101
Scheme 101: AUTO HEADLIGHT BEAM LEVELER CM
| Terminal No. (terminal symbol) | Item | Measuring condition | Standard |
|---|
| 1 (IG) <----> Chassis ground | Voltage | Ignition switch ON | 8 - 16 V |
| 2 (E1) <----> Chassis ground | Resistance | Always | Less than 1 ohms |
| 3 (SGR) <----> Chassis ground | Resistance | Always | Less than 1 ohms |
| 6 (WNG) <----> Chassis ground | Voltage | After turning the ignition switch to ON, for 3 seconds (warning light on) --> after 3 seconds (warning light off) | Less than 1.35 V --> 8 - 16 V |
| 10 (LH1) <----> Chassis ground | Voltage | Ignition switch ON | 10 - 16 V |
| 11 (LH3) <----> Chassis ground | Resistance | Always | Less than 1 ohms |
| 12 (SBR) <----> 3 (SGR) | Voltage | Ignition switch ON | 4.75 - 5.25 V |
| 17 (LH2) <----> Chassis ground | Voltage | Headlight off --> on | Less than 1 V --> 1.0 - 14.4 V (for 17 seconds) |
| Headlight on, no vehicle height change --> change and hold vehicle height for 3 seconds or more |
| 19 (SHR) <----> Chassis ground | Voltage | IG ON (with no passenger, no load and vehicle stopped) | Approx. 2.5 V (changes according to vehicle condition) |
| 23 (CAN-H) <----> Chassis ground | | Cannot be measured (CAN communication line) | |
| 24 (CAN-L) <----> Chassis ground | | Cannot be measured (CAN communication line) | |
COMMUNICATION FOR INITIALIZING IMPOSSIBLE
Communication error with auto headlight beam leveler CM
DETECTING CONDITION
- Defective harness connector
- Power supply circuit malfunction
- Defective auto headlight beam leveler CM
- Defective CAN communication circuit
- Defective Subaru Select Monitor
LIST
| Item Name | Content | Standard | Note |
|---|
| Trip Count | Information of timestamp, trip counter | | |
| Count | Information of timestamp, original counter identification information | | |
| Time Count | Information of timestamp, time counter | | |
| F Sensor Signal | Output voltage value from front vehicle height sensor Display range: 0.00 - 5.00 V | 5V | Fixed at 5 V because front vehicle height sensor is not equipped. |
| R Sensor Signal | Output voltage value from rear vehicle height sensor Display range: 0.00 - 5.00 V | Approx. 2.5 V | Changes according to vehicle condition. |
| Actuator Signal | Power supply voltage value to headlight beam leveler actuator Display range: 0% - 100% | Not in operation: 0% In operation: 10 - 90% (17 seconds) | Changes according to vehicle condition. |
| ECU ACC | IG voltage condition of auto headlight beam leveler CM Display range: 0.00 - 25.76 V | 8 - 16 V | |
| Indicator Signal | Meter indicator condition Display range: Light off/Light up/Flashing | Light off: Normal Light up: Abnormal Blink: Not initialized | |
| Vehicle speed signal | Vehicle speed condition Display range: 0.00 - 3686.34 km/h | Show vehicle speed | |
| H/L Lo Signal | Headlight lighting condition Display range: Light off/Light up | Light off: light switch OFF Light up: light switch HEAD or light switch AUTO with light sensor operated | |
Note. For detailed operation procedures, refer to "PC application help for Subaru Select Monitor".
| DTC | Item | Content of diagnosis | Reference |
|---|
| U0073 | Control Module Communication Bus "A" Off | Detected when CAN line abnormality is detected. | < Ref. to DTC U0073 CONTROL MODULE COMMUNICATION BUS "A" OFF , Diagnostic Procedure with Diagnostic Trouble Code (DTC). > |
| U0122 | Lost Communication With Vehicle Dynamics Control Module | Detected when CAN data from VDC (vehicle speed signal) does not arrive. | < Ref. to DTC U0122 LOST COMMUNICATION WITH VEHICLE DYNAMICS CONTROL MODULE , Diagnostic Procedure with Diagnostic Trouble Code (DTC). > |
| U0140 | Lost Communication With Body Control Module | Detected when CAN data from body integrated unit (headlight ON signal) does not arrive. | < Ref. to DTC U0140 LOST COMMUNICATION WITH BODY CONTROL MODULE , Diagnostic Procedure with Diagnostic Trouble Code (DTC). > |
| B2900 | AHLCU Error | Detected when an error occurred in auto headlight beam leveler CM. | < Ref. to DTC B2900 AHLCU ERROR , Diagnostic Procedure with Diagnostic Trouble Code (DTC). > |
| B2902 | Rear Height Sensor Error | Detected when an error occurred in rear vehicle height sensor. | < Ref. to DTC B2902 REAR HEIGHT SENSOR ERROR , Diagnostic Procedure with Diagnostic Trouble Code (DTC). > |
| B2903 | VDC Data Error | Detected when data from VDC (vehicle speed signal) is abnormal. | < Ref. to DTC B2903 VDC DATA ERROR , Diagnostic Procedure with Diagnostic Trouble Code (DTC). > |
BEAM LEVEL CONTROL DOES NOT FUNCTION
| CAUTION | Before performing diagnosis, check the fuse in this circuit. Initialization is required after replacing the auto headlight beam leveler CM. |
