Lighting: Overview Lexus LS IV

SYSTEM DESCRIPTION

1. HID HEADLIGHT SYSTEM The HID (High Intensity Discharge) headlight system uses a discharge bulb as its light source for the Lo beam. Discharge bulbs are superior to halogen bulbs. Discharge bulbs have the following features. The light emitted by the bulb is close in color to sunlight. The light shines ahead over a broader area and further forward, increasing the area visible to the driver. Less power is consumed. This system consists of discharge bulbs and headlight control ECUs. The headlight control ECU transforms the voltage that is input from the battery to a high voltage of up to 20000 V and applies it to the discharge bulbs in order to illuminate them. A fail-safe function is provided as a countermeasure against the high voltage that is generated in case that a problem occurs in the headlight system.
2. AUTOMATIC HEADLIGHT BEAM LEVEL CONTROL SYSTEM When the headlights are on, the automatic headlight beam level control system operates the headlight level actuator in accordance with movement of the vehicle. The automatic headlight beam level control system mainly consists of the AFS ECU, front and rear height control sensor, and 2 headlight level actuators. On models without the air suspension system, the AFS ECU calculates changes in the vehicle posture based on the signals from the height control sensor (front and rear) and each ECU. On models with the air suspension system, the AFS ECU calculates changes in the vehicle posture based on the signals from the air suspension ECU and each ECU. The ECU then controls the headlight level actuator based on this information, in order to change the headlight reflector angle.
3. AFS An intelligent AFS (Adaptive Front-lighting System) is used in order to ensure a wide Lo beam lighting area and realize excellent visibility during turns by moving the Lo beam. The intelligent AFS of the this vehicle uses medium-to-high speed control and low speed control. In the medium-to-high speed control, the system calculates the target lighting angle based on the tire angle and vehicle speed and changes the swivel angle of the low-beam headlights individually. During the low speed control, the system calculates the target lighting angle based on the steering angle and changes the swivel angle of the low-beam headlight on the side facing into the turn.
4. ILLUMINATED ENTRY SYSTEM The illuminated entry system of the this vehicle controls 8 kinds of light: engine switch illumination, interior foot light illumination, seat belt buckle switch illumination, courtesy light, door inside handle illumination, interior light (for front and rear) and foot light. The main body ECU controls this system.
5. INTERIOR LIGHT CONTROL The interior light control (front interior light, engine switch illumination) consists primarily of the fade-in/fade-out function and timer illumination function.
6. INTERIOR FOOT LIGHT ILLUMINATION CONTROL AND DOOR INSIDE HANDLE ILLUMINATION CONTROL The interior foot light illumination control and door inside handle illumination control consist primarily of the fade-in/fade-out function and timer illumination function.
7. DOOR MIRROR FOOT LIGHT CONTROL The door mirror foot light control consists primarily of the fade-in/fade-out function and timer illumination function.
8. SEAT BELT BUCKLE SWITCH ILLUMINATION CONTROL The seat belt buckle switch illumination control consists primarily of the fade-in/fade-out function and timer illumination function.
9. BATTERY SAVING CONTROL When the following 2 conditions have been met, battery saving control turns off the lights illuminated by the illuminated entry controls (interior light control and interior foot light illumination control). There is no change in the condition of the doors for 20 minutes.
10. AUTOMATIC LIGHT CONTROL SYSTEM When the light control switch is in the AUTO position, the automatic light control system detects ambient light levels and controls the headlights and taillights (parking lights, taillights and license plate lights). Ambient light levels are detected by the light control sensor that is integrated into the air conditioning system's front solar sensor. The main body ECU controls this system.
11. LIGHT AUTO TURN OFF SYSTEM The light auto turn off system is used to prevent the driver from leaving the vehicle with the exterior lights (headlights, fog lights, parking lights, taillights and license plate lights) ON. This system turns all exterior lights OFF approximately 30 seconds after either of the following conditions is met: The engine switch is turned off, any door is opened and all the doors and luggage compartment door are closed with all exterior lights ON. The engine switch is turned off, all the doors are closed and the luggage compartment door is opened and closed with all exterior lights ON. This system turns all exterior lights OFF immediately when the lock button on the wireless remote control is pushed with all the doors are locked. When the engine switch is turned off and the driver's door is opened with the exterior lights other than the headlights ON, this system turns them OFF.

DESCRIPTION

This DTC is output when a failure of the automatic light control sensor circuit is detected.

DTC DETECTION CONDITION AND TROUBLE AREA REFERENCE CHART

Scheme 1

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1. CLEAR DTC Clear the DTC (see «DTC CHECK/CLEAR» ).
2. CHECK DTC Check for DTC (see «DTC CHECK/CLEAR» ). OK: DTC B1244 output does not occur. NG: Go to step 3 OK: NORMAL
3. READ VALUE USING TECHSTREAM (AUTOMATIC LIGHT CONTROL SENSOR) Using the Techstream, read the Data List. Main Body MAIN BODY DATA LIST Tester Display Measurement Item/Range Normal Condition Diagnostic Note Illumination Rate Info Condition of automatic light control sensor/0 to 235600 Ix Condition value will be displayed - OK: Output illuminance is as shown in table above. NG: Go to step 4 OK: REPLACE MAIN BODY ECU
4. CHECK MAIN BODY ECU (CLTB - CLTE VOLTAGE) Measure the voltage according to the value(s) in the table below. Standard voltage VOLTAGE SPECIFIED CONDITIONS Tester Connection Switch Condition Specified Condition L12-20 (CLTB) - L12-18 (CLTE) Engine switch on (IG) 11 to 14 V NG: REPLACE MAIN BODY ECU OK: Go to next step
5. CHECK HARNESS AND CONNECTOR (MAIN BODY ECU - AUTOMATIC LIGHT CONTROL SENSOR) Disconnect the L12 ECU connector. Disconnect the M2 sensor connector. Measure the resistance according to the value(s) in the table below. Standard resistance RESISTANCE SPECIFIED CONDITIONS Tester Connection Condition Specified Condition L12-20 (CLTB) - M2-6 (CLTB) Always Below 1 ohms L12-19 (CLTS) - M2-5 (CLTS) L12-18 (CLTE) - M2-3 (CLTE) L12-20 (CLTB) - Body ground Always 10 kohms or higher L12-19 (CLTS) - Body ground L12-18 (CLTE) -Body ground NG: REPAIR OR REPLACE HARNESS OR CONNECTOR OK: REPLACE AUTOMATIC LIGHT CONTROL SENSOR (See «REMOVAL» )

The electric current flowing in the transistor inside the rear junction block is examined by the rear junction block ECU.

When excessive current is detected, DTC B2402 is output.

Turning off the engine switch clears the DTC.

DTC DETECTION CONDITION AND TROUBLE AREA REFERENCE CHART

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1. READ VALUE USING TECHSTREAM (REAR JUNCTION BLOCK ECU) Using the Techstream, read the Data List. Body No. 4 BODY NO. 4 DATA LIST Tester Display Measurement Item/Range Normal Condition Diagnostic Note Tail Light Tr States of taillight/OK or Break OK: Taillight circuit is normal Break: Taillight circuit is malfunctioning Confirm that headlight dimmer switch is ON (TAIL or HEAD) Stop Light Tr States of stop light/OK or Break OK: Stop light circuit is normal Break: Stop light circuit is malfunctioning Confirm that brake pedal is pressed High Mount Stop Light Tr States of high mount stop light/ OK or Break OK: High mount stop light circuit is normal Break: High mount stop light circuit is malfunctioning Confirm that brake pedal is pressed Result: RESULT CHART Result Proceed to Item (TAIL LGT Tr.) displays "Break" on the Techstream A Item (STOP LGT Tr.) displays "Break" is on the Techstream B Item (H-M STP LGT Tr.) displays "Break" on the Techstream C All items display "OK" on the Techstream D B: Go to step 4 C: Go to step 6 D: Go to step 8 A: Go to next step
2. READ VALUE USING TECHSTREAM (TAILLIGHT AND LICENSE PLATE LIGHT) Disconnect the connectors in the following order: Rear combination light (LH, RH), rear light (LH, RH), license plate light. Using the Techstream, read the Data List. Body No. 4 BODY NO. 4 DATA LIST Tester Display Measurement Item/Range Normal Condition Diagnostic Note Tail Light Tr States of taillight/OK or Break OK: Taillight circuit is normal Break: Taillight circuit is malfunctioning Confirm that headlight dimmer switch is ON (TAIL or HEAD) Result: RESULT CHART Disconnected Light Result Proceed to Rear combination light Rear light License plate light Displayed "Break" on the Techstream A Rear combination light Displayed "OK" is on the Techstream B Rear light Displayed "OK" is on the Techstream C License plate light Displayed "OK" is on the Techstream D B: REPLACE REAR COMBINATION LIGHT (See «REMOVAL» ) C: REPLACE REAR LIGHT (See «REMOVAL» ) D: REPLACE LICENSE PLATE LIGHT (See «REMOVAL» ) A: Go to next step
3. READ VALUE USING TECHSTREAM (REAR JUNCTION BLOCK ECU) Disconnect the connectors in the following order: rear junction block ECU connector S63, S64. Using the Techstream, read the Data List. Body No. 4 BODY NO. 4 DATA LIST Tester Display Measurement Item/Range Normal Condition Diagnostic Note Tail Light Tr States of taillight/OK or Break OK: Taillight circuit is normal Break: Taillight circuit is malfunctioning Confirm that headlight dimmer switch is ON (TAIL or HEAD) Result: RESULT CHART Result Proceed to "Break" display does not change A Changes to "Normal" display B B: REPAIR OR REPLACE HARNESS OR CONNECTOR A: REPLACE LUGGAGE ROOM JUNCTION BLOCK (REAR JUNCTION BLOCK ECU)
4. READ VALUE USING TECHSTREAM (STOP LIGHT) Disconnect the connectors in the following order; rear combination light (LH, RH), rear light (LH, RH). Using the Techstream, read the Data List. Body No. 4 BODY NO. 4 DATA LIST Tester Display Measurement Item/Range Normal Condition Diagnostic Note Stop Light Tr States of stop light/OK or Break OK: Stop light circuit is normal Break: Stop light circuit is malfunctioning Confirm that brake pedal is pressed Result: RESULT CHART Disconnected Light Result Proceed to Rear combination light Rear light "Break" display does not change A Rear combination light Changes to "Normal" display B Rear light Changes to "Normal" display C HINT: Disconnect the RH connector, then the LH connector. If the display changes to "Normal", it can be determined that the disconnected light is malfunctioning. B: REPLACE REAR COMBINATION LIGHT ASSEMBLY (See «REMOVAL» ) C: REPLACE REAR LIGHT ASSEMBLY (See «REMOVAL» ) A: Go to next step
5. READ VALUE USING TECHSTREAM (REAR JUNCTION BLOCK ECU) Disconnect the connectors in the following order: rear junction block ECU connector S63, S64. Using the Techstream, read the Data List. Body No. 4 BODY NO. 4 DATA LIST Tester Display Measurement Item/Range Normal Condition Diagnostic Note Stop Light Tr States of stop light/OK or Break OK: Stop light circuit is normal Break: Stop light circuit is malfunctioning Confirm that brake pedal is pressed Result: RESULT CHART Result Proceed to "Break" display does not change A Changes to "Normal" display B B: REPAIR OR REPLACE HARNESS OR CONNECTOR A: REPLACE LUGGAGE ROOM JUNCTION BLOCK (REAR JUNCTION BLOCK ECU)
6. READ VALUE USING TECHSTREAM (CENTER STOP LIGHT) Disconnect the connectors in the following order: Center stop light. Using the Techstream, read the Data List. Body No. 4 BODY NO. 4 DATA LIST Tester Display Measurement Item/Range Normal Condition Diagnostic Note High Mount Stop Light Tr States of high mount stop light/ OK or Break OK: High mount stop light circuit is normal Break: High mount stop light circuit is malfunctioning Confirm that brake pedal is pressed Result: RESULT CHART Result Proceed to "Break" display does not change A Changes to "Normal" display B B: REPLACE CENTER STOP LIGHT ASSEMBLY (See «REMOVAL» ) A: Go to next step
7. READ VALUE USING TECHSTREAM (REAR JUNCTION BLOCK ECU) Disconnect the connectors in the following order: rear junction block ECU connector S62. Using the Techstream, read the Data List. Body No. 4 BODY NO. 4 DATA LIST Tester Display Measurement Item/Range Normal Condition Diagnostic Note High Mount Stop Light Tr States of high mount stop light/ OK or Break OK: High mount stop light circuit is normal Break: High mount stop light circuit is malfunctioning Confirm that brake pedal is pressed Result: RESULT CHART Result Proceed to "Break" display does not change A Changes to "Normal" display B B: REPAIR OR REPLACE HARNESS OR CONNECTOR A: REPLACE LUGGAGE ROOM JUNCTION BLOCK (REAR JUNCTION BLOCK ECU)
8. CHECK HARNESS AND CONNECTOR (LICENSE PLATE LIGHT - REAR JUNCTION BLOCK ECU AND BODY GROUND) Disconnect the S63 ECU connector. Disconnect the S37 light connector. Measure the resistance according to the value(s) in the table below. Standard resistance RESISTANCE SPECIFIED CONDITIONS Tester Connection Condition Specified Condition S63-15 (LCE2) - S37-1 (B) Always Below 1 ohms S37-2 (E) - Body ground Always Below 1 ohms S63-15 (LCE2) - Body ground Always 10 kohms or higher NG: REPAIR OR REPLACE HARNESS OR CONNECTOR OK: Go to next step
9. CHECK HARNESS AND CONNECTOR (REAR LIGHT - REAR JUNCTION BLOCK ECU AND BODY GROUND) Disconnect the S63 ECU connector. Disconnect the S33 and S41 light connectors. Measure the resistance according to the value(s) in the table below. Standard resistance: for LH RESISTANCE SPECIFIED CONDITIONS Tester Connection Condition Specified Condition S63-14 (TIL3) - S33-2 (11 P) Always Below 1 ohms S63-4 (STP3) - S33-1 (B) Always Below 1 ohms S33-4 (E) - Body ground Always Below 1 ohms S63-14 (TIL3) - Body ground Always 10 kohms or higher S63-4 (STP3) - Body ground Always 10 kohms or higher for RH RESISTANCE SPECIFIED CONDITIONS Tester Connection Condition Specified Condition S63-13 (TIL4) - S41-2 (T/P) Always Below 1 ohms S63-4 (STP3) - S41-1 (B) Always Below 1 ohms S41-4 (E) - Body ground Always Below 1 ohms S63-13 (TIL4) - Body ground Always 10 kohms or higher S63-4 (STP3) - Body ground Always 10 kohms or higher NG: REPAIR OR REPLACE HARNESS OR CONNECTOR OK: Go to next step
10. CHECK HARNESS AND CONNECTOR (REAR COMBINATION LIGHT - REAR JUNCTION BLOCK ECU AND BODY GROUND) Disconnect the S64 ECU connector. Disconnect the S51 and S52 light connectors. Measure the resistance according to the value(s) in the table below. Standard resistance: for LH RESISTANCE SPECIFIED CONDITIONS Tester Connection Condition Specified Condition S64-3 (TIL2) - S51-3 (TL) Always Below 1 ohms S64-9 (STP2) - S51-1 (STP) Always Below 1 ohms S51-4 (E) - Body ground Always Below 1 ohms S64-3 (TIL2) - Body ground Always 10 kohms or higher S64-9 (STP2) - Body ground Always 10 kohms or higher for RH RESISTANCE SPECIFIED CONDITIONS Tester Connection Condition Specified Condition S64-7 (TIL1) - S52-3 (TL) Always Below 1 ohms S64-10 (STP1) - S52-1 (STP) Always Below 1 ohms S52-4 (E) - Body ground Always Below 1 ohms S64-7 (TIL1) - Body ground Always 10 kohms or higher S64-10 (STP1) - Body ground Always 10 kohms or higher NG: REPAIR OR REPLACE HARNESS OR CONNECTOR OK: Go to next step
11. CHECK HARNESS AND CONNECTOR (CENTER STOP LIGHT - REAR JUNCTION BLOCK ECU AND BODY GROUND) Disconnect the S62 ECU connector. Disconnect the S20 light connector. Measure the resistance according to the value(s) in the table below. Standard resistance RESISTANCE SPECIFIED CONDITIONS Tester Connection Condition Specified Condition S62-6 (STP4) - S20-1 (B) Always Below 1 ohms S20-2 (E) - Body ground Always Below 1 ohms S62-6 (STP4) - Body ground Always 10 kohms or higher NG: REPAIR OR REPLACE HARNESS OR CONNECTOR OK: REPLACE LUGGAGE ROOM JUNCTION BLOCK (REAR JUNCTION BLOCK ECU)

These DTCs are output when the AFS ECU detected errors in its own communications with the headlight (headlight swivel motor).

DTC DETECTION CONDITION AND TROUBLE AREA REFERENCE CHART

Scheme 10

The swivel motor receives a signal from the AFS ECU to operate and sends a signal indicating the direction of the headlight and condition of the headlight swivel motor to the AFS ECU.

DTC DETECTION CONDITION AND TROUBLE AREA REFERENCE CHART

Scheme 11

The AFS ECU receives signals indicating the swerve-angle from the steering angle sensor using CAN communication.

DTC DETECTION CONDITION AND TROUBLE AREA REFERENCE CHART

Scheme 12

The AFS ECU receives signals indicating the front wheel speed from the skid control ECU using CAN communication.

DTC DETECTION CONDITION AND TROUBLE AREA REFERENCE CHART

Scheme 13

w/ Coil Suspension

The AFS ECU receives signals indicating the height of the vehicle from the height control sensor.

w/ Air Suspension

The AFS ECU receives signals indicating the height of the vehicle from the suspension control ECU.

w/ Coil Suspension

DTC DETECTION CONDITION AND TROUBLE AREA REFERENCE CHART

w/ Air Suspension

DTC DETECTION CONDITION AND TROUBLE AREA REFERENCE CHART

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1. CLEAR DTC Clear the DTC (see «DTC CHECK/CLEAR» ).
2. CHECK DTC Check for DTC (see «DTC CHECK/CLEAR» ). OK: DTC B2416 output does not occur. NG: Go to step 3 OK: NORMAL
3. CHECK VEHICLE SYSTEM Check vehicle system. Result: RESULT CHART Result Proceed to w/ Coil Suspension A w/ Air Suspension B B: Go to step 10 A: Go to next step
4. READ VALUE USING TECHSTREAM (HEIGHT CONTROL SENSOR) Using the Techstream, read the Data List. AFS AFS DATA LIST Tester Display Measurement Item/Range Normal Condition Diagnostic Note Rr Height Sens Signal Val Rear height control sensor signal/Min.: 0 V, Max.: 5 V Height control sensor vehicle height value - Height Sens Pw Supply Val Height control sensor power supply value/Min.: 0 V, Max.: 5 V Power supply voltage to height control sensor - OK: Normal conditions listed above are displayed. NG: Go to step 5 OK: REPLACE AFS ECU (See «REMOVAL» )
5. CHECK HARNESS AND CONNECTOR (AFS ECU - HEIGHT CONTROL SENSOR) Disconnect the A37 ECU connector. Disconnect the S65 and A4 sensor connectors. Measure the resistance according to the value(s) in the table below. Standard resistance RESISTANCE SPECIFIED CONDITIONS Tester Connection Condition Specified Condition A37-18 (SBR) - S65-3 (SHB) Always Below 1 ohms A37-19 (SHRL) - S65-2 (SHRL) Always Below 1 ohms A37-21 (SGR) - S65-1 (SHG) Always Below 1 ohms A37-18 (SBR) - Body ground Always 10 kohms or higher A37-19 (SHRL) - Body ground Always 10 kohms or higher A37-21 (SGR) - Body ground Always 10 kohms or higher A37-17 (SHFL) - A4-2 (SHFL) Always Below 1 ohms A37-18 (SBR) - A4-3 (SHB) Always Below 1 ohms A37-21 (SGR) - A4-1 (SHG) Always Below 1 ohms A37-17 (SHFL) - Body ground Always 10 kohms or higher NG: REPAIR OR REPLACE HARNESS OR CONNECTOR OK: Go to next step
6. CHECK AFS ECU (SBR - SGR VOLTAGE) Reconnect the A37 ECU connector. Turn the engine switch on (IG). Measure the voltage according to the value(s) in the table below. Standard voltage VOLTAGE SPECIFIED CONDITIONS Tester Connection Switch Condition Specified Condition A37-18 (SBR) - A37-21 (SGR) Engine switch on (IG) 4.5 to 5.5 V NG: REPLACE AFS ECU (See «REMOVAL» ) OK: Go to next step
7. INSPECT FRONT HEIGHT CONTROL SENSOR SUB-ASSEMBLY Connect 3 dry cell batteries (1.5 V) in series. Connect the positive (+) lead from the batteries to terminal 3, and the negative (-) lead from the batteries to terminal 1. Measure the voltage between terminals 2 and 1 while slowly moving the link up and down. Standard voltage VOLTAGE SPECIFIED CONDITIONS Tester Connection Condition Specified Condition 2 (SHFL) -1 (SHG) +45° (High) 4.05 V +45° (Normal) 2.25 V -45° (Low) 0.45 V NG: REPLACE FRONT HEIGHT CONTROL SENSOR SUB-ASSEMBLY (See «REMOVAL» ) OK: Go to next step
8. INSPECT REAR HEIGHT CONTROL SENSOR SUB-ASSEMBLY Connect 3 dry cell batteries (1.5 V) in series. Connect the positive (+) lead from the batteries to terminal 3, and the negative (-) lead from the batteries to terminal 1. Measure the voltage between terminals 2 and 1 while slowly moving the link up and down. Standard voltage VOLTAGE SPECIFIED CONDITIONS Tester Connection Condition Specified Condition 2 (SHRL) - 1 (SHG) +45° (High) 4.05 V 0° (Normal) 2.25 V -45° (Low) 0.45 V NG: REPLACE REAR HEIGHT CONTROL SENSOR SUB-ASSEMBLY (See «REMOVAL» ) OK: Go to next step
9. INSPECT REAR HEIGHT CONTROL SENSOR LH WIRE Disconnect the S65 and A wire connectors. Measure the resistance according to the value(s) in the table below. Standard resistance RESISTANCE SPECIFIED CONDITIONS Tester Connection Condition Specified Condition A-1 - S65-1 (SHG) Always Below 1 ohms A-2 - S65-2 (SHRL) Always Below 1 ohms A-3 - S65-3 (SHB) Always Below 1 ohms A-1 - Body ground Always 10 kohms or higher A-2 - Body ground Always 10 kohms or higher A-3 - Body ground Always 10 kohms or higher NG: REPLACE REAR HEIGHT CONTROL SENSOR LH WIRE OK: REPLACE AFS ECU (See «REMOVAL» )
10. CHECK DTC (AIR SUSPENSION SYSTEM) Check for DTC (see «DTC CHECK/CLEAR» ). Result RESULT CHART Result Proceed to DTC "C1712/12 Front Height Control Sensor LH Circuit Malfunction" and "C1714/14 Rear Height Control Sensor LH Circuit Malfunction" output do not occur A DTC "C1712/12 Front Height Control Sensor LH Circuit Malfunction" or "C1714/14 Rear Height Control Sensor LH Circuit Malfunction" output occurs B B: GO TO AIR SUSPENSION SYSTEM (See «DIAGNOSTIC TROUBLE CODE CHART» ) A: Go to next step
11. READ VALUE USING TECHSTREAM (AFS ECU) Using the Techstream, read the Data List. AFS AFS DATA LIST Tester Display Measurement Item/Range Normal Condition Diagnostic Note Height Sens Pw Supply Val Height control sensor power supply value/Min.: 0 V, Max.: 5 V Power supply voltage to height control sensor - Fr Height Sens Signal Val Front height control sensor signal/Min.: 0 V, Max.: 5 V Height control sensor vehicle height value - Rr Height Sens Signal Val Rear height control sensor signal/Min.: 0 V, Max.: 5 V Height control sensor vehicle height value - NG: Go to step 12 OK: REPLACE AFS ECU (See «REMOVAL» )
12. CHECK SUSPENSION CONTROL ECU Measure the voltage according to the value(s) in the table below. Standard voltage VOLTAGE SPECIFIED CONDITIONS Tester Connection Switch Condition Specified Condition A39-23 (SBL3) - A39-24 (SGL3) Engine switch on (IG) Approx. 5 V A39-21 (SHF2) - A39-24 (SGL3) While engine is running, height control switch is changed from HIGH to NORM, and vehicle height adjustment is finished Approx. 2.5 V A39-19 (SHR2) - A39-24 (SGL3) While engine is running, height control switch is changed from HIGH to NORM, and vehicle height adjustment is finished Approx. 2.5 V Measure the resistance according to the value(s) in the table below. Standard resistance RESISTANCE SPECIFIED CONDITIONS Tester Connection Condition Specified Condition A39-24 (SGL3) - Body ground Always Below 1 ohms NG: REPLACE SUSPENSION CONTROL ECU (See «REMOVAL» ) OK: Go to next step
13. CHECK HARNESS AND CONNECTOR (AFS ECU - SUSPENSION CONTROL ECU) Disconnect the A37 and A39 ECU connectors. Measure the resistance according to the value(s) in the table below. Standard resistance RESISTANCE SPECIFIED CONDITIONS Tester Connection Condition Specified Condition A37-17 (SHFL) - A39-21 (SHF2) Always Below 1 ohms A37-18 (SBR) - A39-23 (SBL3) Always Below 1 ohms A37-19 (SHRL) - A39-19 (SHR2) Always Below 1 ohms A37-21 (SGR) - A39-24 (SGL3) Always Below 1 ohms A37-17 (SHFL) - Body ground Always 10 kohms or higher A37-18 (SBR) - Body ground Always 10 kohms or higher A37-19 (SHRL) - Body ground Always 10 kohms or higher A37-21 (SGR) - Body ground Always 10 kohms or higher NG: REPAIR OR REPLACE HARNESS OR CONNECTOR OK: REPLACE AFS ECU (See «REMOVAL» )

The headlight leveling motor receives a signal from the AFS ECU to operate. The AFS ECU receives a signal indicating the operating conditions of the headlight leveling motor.

DTC DETECTION CONDITION AND TROUBLE AREA REFERENCE CHART

HINT

Perform a visual check of the headlight leveling motor before replacing it.

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1. CHECK FOR DTC Clear the DTC (see «DTC CHECK/CLEAR» ). Check for DTC (see «DTC CHECK/CLEAR» ). OK: DTC B2417 or B2418 output does not occur. NG: Go to step 2 OK: USE SIMULATION METHOD TO CHECK (See «HOW TO PROCEED WITH TROUBLESHOOTING» )
2. PERFORM ACTIVE TEST USING TECHSTREAM (HEADLIGHT LEVELING MOTOR) Using the Techstream, perform the Active Test. AFS AFS ACTIVE TEST REFERENCE CHART Tester Display Test Part Control Range Diagnostic Note Drive The Leveling Motor UP Leveling motor upward operation OFF - UP - Drive The Leveling Motor DOWN Leveling motor downward operation OFF - DOWN - OK: Headlight leveling motors operate normally. NG: Go to step 4 OK: Go to next step
3. CHECK HEADLIGHT LEVELING MOTOR (OPERATION) Temporarily replace the headlight leveling motor with a new or normally functioning one (see «DISASSEMBLY» ). Check for DTC (see «DTC CHECK/CLEAR» ). OK: DTC B2417 or B2418 output does not occur. NG: REPLACE AFS ECU (See «REMOVAL» ) OK: END (REPLACE HEADLIGHT LEVELING MOTOR) (See «DISASSEMBLY» )
4. READ VALUE USING TECHSTREAM (AFS ECU) Using the Techstream, read the Data List. AFS AFS ACTIVE TEST REFERENCE CHART Tester Display Measurement Item/Range Normal Condition Diagnostic Note +B AFS ECU power source voltage/Min.: 0V, Max.: 19.75 V 11 to 14 V - NG: REPAIR OR REPLACE HARNESS OR CONNECTOR OK: Go to next step
5. CHECK HARNESS AND CONNECTOR (AFS ECU - BODY GROUND) Disconnect the A37 ECU connector. Measure the resistance according to the value(s) in the table below. Standard resistance RESISTANCE SPECIFIED CONDITIONS Tester Connection Condition Specified Condition A37-22 (E1) - Body ground Always Below 1 ohms NG: REPAIR OR REPLACE HARNESS OR CONNECTOR OK: Go to next step
6. CHECK HARNESS AND CONNECTOR (AFS ECU - HEADLIGHT LEVELING MOTOR) Disconnect the A37 ECU connector. Disconnect the B2 and B12 motor connectors. Measure the resistance according to the value(s) in the table below. Standard resistance: for LH RESISTANCE SPECIFIED CONDITIONS Tester Connection Condition Specified Condition A37-3 (LHT) - B2-5 (LHB1) Always Below 1 ohms A37-27 (LH-) - B2-3 (LHE) Always Below 1 ohms A37-30 (LH+) - B2-4 (LHM+) Always Below 1 ohms A37-3 (LHT) - Body ground Always 10 kohms or higher A37-27 (LH-) - Body ground Always 10 kohms or higher A37-30 (LH+) - Body ground Always 10 kohms or higher for RH RESISTANCE SPECIFIED CONDITIONS Tester Connection Condition Specified Condition A37-4 (RHT) - B12-5 (RHB1) Always Below 1 ohms A37-28 (RH-) - B12-3 (RHE) Always Below 1 ohms A37-11 (RH+) - B12-4 (RHM+) Always Below 1 ohms A37-4 (RHT) - Body ground Always 10 kohms or higher A37-28 (RH-) - Body ground Always 10 kohms or higher A37-11 (RH+) - Body ground Always 10 kohms or higher NG: REPAIR OR REPLACE HARNESS OR CONNECTOR OK: Go to next step
7. CHECK HEADLIGHT ASSEMBLY Disconnect the B2 and B12 motor connectors. Disconnect the leveling motor connector. Measure the resistance according to the value(s) in the table below. Standard resistance: for LH RESISTANCE SPECIFIED CONDITIONS Tester Connection Condition Specified Condition B2-5 (LHB1) - 1 (IG) Always Below 1 ohms B2-4 (LHM+) - 2 (LIN) Always Below 1 ohms B2-3 (LHE) - 3 (GND) Always Below 1 ohms for RH RESISTANCE SPECIFIED CONDITIONS Tester Connection Condition Specified Condition B12-5 (RHB1) - 1 (IG) Always Below 1 ohms B12-4 (RHM+) - 2 (LIN) Always Below 1 ohms B12-3 (RHE) - 3 (GND) Always Below 1 ohms NG: REPLACE HEADLIGHT ASSEMBLY (See «REMOVAL» ) OK: Go to next step
8. CHECK HEADLIGHT LEVELING MOTOR (OPERATION) Temporarily replace the headlight leveling motor with a new or normally functioning one (see «DISASSEMBLY» ). Check for DTC (see «DTC CHECK/CLEAR» ). OK: DTC B2417 or B2418 output does not occur. NG: REPLACE AFS ECU (See «REMOVAL» ) OK: END (REPLACE HEADLIGHT LEVELING MOTOR) (See «DISASSEMBLY» )

When the AFS ECU detects a malfunction in itself, a DTC is output.

DTC DETECTION CONDITION AND TROUBLE AREA REFERENCE CHART

This DTC is output if the AFS ECU is not installed properly.

DTC DETECTION CONDITION AND TROUBLE AREA REFERENCE CHART

The AFS ECU receives a signal from the headlight swivel motor using LIN communication.

DTC DETECTION CONDITION AND TROUBLE AREA REFERENCE CHART

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Scheme 29

1. CHECK FOR DTC Clear the DTC (see «DTC CHECK/CLEAR» ). Check for DTC (see «DTC CHECK/CLEAR» ). OK: DTC B2424 or B2425 output does not occur. NG: Go to step 2 OK: USE SIMULATION METHOD TO CHECK (See «HOW TO PROCEED WITH TROUBLESHOOTING» )
2. READ VALUE USING TECHSTREAM (AFS ECU) Using the Techstream, read the Data List. AFS AFS DATA LIST Tester Display Measurement Item/Range Normal Condition Diagnostic Note +B AFS ECU power source voltage/Min.: 0 V, Max.: 19.75 V 11 to 14 V - NG: REPAIR OR REPLACE HARNESS OR CONNECTOR OK: Go to next step
3. CHECK HARNESS AND CONNECTOR (AFS ECU - BODY GROUND) Disconnect the A37 ECU connector. Measure the resistance according to the value(s) in the table below. Standard resistance RESISTANCE SPECIFIED CONDITIONS Tester Connection Condition Specified Condition A37-22 (E1) - Body ground Always Below 1 ohms NG: REPAIR OR REPLACE HARNESS OR CONNECTOR OK: Go to next step
4. CHECK HARNESS AND CONNECTOR (AFS ECU - HEADLIGHT) Disconnect the A37 ECU connector. Disconnect the B2 and B12 motor connectors. Measure the resistance according to the value(s) in the table below. Standard resistance: for LH RESISTANCE SPECIFIED CONDITIONS Tester Connection Condition Specified Condition A37-3 (LHT) - B2-5 (LHB1) Always Below 1 ohms A37-27 (LH-) - B2-3 (LHE) Always Below 1 ohms A37-30 (LH+) - B2-4 (LHM+) Always Below 1 ohms A37-3 (LHT) - Body ground Always 10 kohms or higher A37-27 (LH-) - Body ground Always 10 kohms or higher A37-30 (LH+) - Body ground Always 10 kohms or higher for RH RESISTANCE SPECIFIED CONDITIONS Tester Connection Condition Specified Condition A37-4 (RHT) - B12-5 (RHB1) Always Below 1 ohms A37-28 (RH-) - B12-3 (RHE) Always Below 1 ohms A37-11 (RH+) - B12-4 (RHM+) Always Below 1 ohms A37-4 (RHT) - Body ground Always 10 kohms or higher A37-28 (RH-) - Body ground Always 10 kohms or higher A37-11 (RH+) - Body ground Always 10 kohms or higher NG: REPAIR OR REPLACE HARNESS OR CONNECTOR OK: Go to next step
5. CHECK HEADLIGHT ASSEMBLY Disconnect the B2 and B12 motor connectors. Disconnect the leveling motor connector. Measure the resistance according to the value(s) in the table below. Standard resistance: for LH RESISTANCE SPECIFIED CONDITIONS Tester Connection Condition Specified Condition B2-4 (LHM+) - 2 (LIN) Always Below 1 ohms for RH RESISTANCE SPECIFIED CONDITIONS Tester Connection Condition Specified Condition B12-4 (RHM+) - 2 (LIN) Always Below 1 ohms NG: REPLACE HEADLIGHT ASSEMBLY (See «REMOVAL» ) OK: Go to next step
6. CHECK HEADLIGHT LEVELING MOTOR (OPERATION) Temporarily replace the headlight leveling motor with a new or normally functioning one (see «DISASSEMBLY» ). Check for DTC (see «DTC CHECK/CLEAR» ). OK: DTC B2424 or B2425 output does not occur. NG: REPLACE AFS ECU (See «REMOVAL» ) OK: END (REPLACE HEADLIGHT LEVELING MOTOR) (See «DISASSEMBLY» )

1. The AFS ECU receives an engine running states signal and shift position signal from the ECM using CAN communication.
2. The AFS ECU receives front speed sensor LH and RH signals from the skid control ECU using CAN communication.
3. The AFS ECU receives the headlight states signal from the main body ECU using CAN communication.
4. The AFS ECU sends an AFS OFF indicator light ON or OFF demand signal to the combination meter ECU using CAN communication. DTC DETECTION CONDITION AND TROUBLE AREA REFERENCE CHART DTC Code DTC Detection Condition Trouble Area B2427 Malfunction in CAN communication system Malfunction of AFS ECU CAN communication system AFS ECU

The AFS ECU receives steering wheel position information (turned to right or left) from the main body ECU via CAN communication.

DTC DETECTION CONDITION AND TROUBLE AREA REFERENCE CHART

Scheme 30

The multiplex network front light ECU (front controller) illuminates and turns off the headlight HI beam.

DTC DETECTION CONDITION AND TROUBLE AREA REFERENCE CHART

Scheme 31

Scheme 32

1. READ VALUE USING TECHSTREAM (HEADLIGHT) Using the Techstream, read the Data List. Body No. 5 BODY NO. 5 DATA LIST Tester Display Measurement Item/Range Normal Condition Diagnostic Note Head Light LH HI Tr Headlight LH HI illumination condition display/OK - Overheat - Overload OK: Normal Overheat: ECU overheats Overload: ECU overload - Head Light RH HI Tr Headlight RH HI illumination condition display/OK - Overheat - Overload OK: Normal Overheat: ECU overheats Overload: ECU overload - OK: Normal condition listed above is displayed. NG: Go to step 2 OK: REPLACE MULTIPLEX NETWORK FRONT LIGHT ECU
2. CHECK HARNESS AND CONNECTOR (MULTIPLEX NETWORK FRONT LIGHT ECU - HEADLIGHT) Disconnect the B14 ECU connector. Disconnect the B3 and B13 light connectors. Measure the resistance according to the value(s) in the table below. Standard resistance: for LH RESISTANCE SPECIFIED CONDITIONS Tester Connection Condition Specified Condition B14-6 (HLHL) - Body ground Always 10 kohms or higher for RH RESISTANCE SPECIFIED CONDITIONS Tester Connection Condition Specified Condition B14-5 (HLHR) - Body ground Always 10 kohms or higher NG: REPAIR OR REPLACE HARNESS OR CONNECTOR OK: Go to next step
3. CHECK NO. 1 HEADLIGHT BULB (OPERATION) Temporarily replace the No. 1 headlight bulb with a new or normally functioning one (see «DISASSEMBLY» ). Check for DTC (see «DTC CHECK/CLEAR» ). OK: DTC B2480 or B2481 output does not occur. NG: Go to step 4 OK: END (REPLACE NO. 1 HEADLIGHT BULB) (See «DISASSEMBLY» )
4. CHECK HEADLIGHT ASSEMBLY (OPERATION) Temporarily replace the headlight with a new or normally functioning one (see «REMOVAL» ). Check for DTC (see «DTC CHECK/CLEAR» ). OK: DTC B2480 or B2481 output does not occur. NG: REPLACE MULTIPLEX NETWORK FRONT LIGHT ECU OK: END (REPLACE HEADLIGHT ASSEMBLY) (See «REMOVAL» )

The multiplex network front light ECU (front controller) illuminates and turns off the clearance light.

DTC DETECTION CONDITION AND TROUBLE AREA REFERENCE CHART

Scheme 33

Scheme 34

1. RAD VALUE USING TECHSTREAM (CLEARANCE LIGHT) Using the Techstream, read the Data List. Body No. 5 BODY NO. 5 DATA LIST Tester Display Measurement Item/Range Normal Condition Diagnostic Note Clearance Light Tr Clearance light illumination condition display/OK - Overheat - Overload OK: Normal Overheat: ECU overheats Overload: ECU overload - OK: Normal condition listed above is displayed. NG: Go to step 2 OK: REPLACE MULTIPLEX NETWORK FRONT LIGHT ECU
2. CHECK HARNESS AND CONNECTOR (MULTIPLEX NETWORK FRONT LIGHT ECU - HEADLIGHT) Disconnect the B14 ECU connector. Disconnect the B2 and B12 light connectors. Measure the resistance according to the value(s) in the table below. Standard resistance: for LH RESISTANCE SPECIFIED CONDITIONS Tester Connection Condition Specified Condition B14-23 (CRAL) - Body ground Always 10 kohms or higher for RH RESISTANCE SPECIFIED CONDITIONS Tester Connection Condition Specified Condition B14-15 (CRAR) - Body ground Always 10 kohms or higher NG: REPAIR OR REPLACE HARNESS OR CONNECTOR OK: Go to next step
3. CHECK CLEARANCE LIGHT BULB (OPERATION) Temporarily replace the clearance light bulb with a new or normally functioning one (see «DISASSEMBLY» ). Check for DTC (see «DTC CHECK/CLEAR» ). OK: DTC B2482 output does not occur. NG: Go to step 4 OK: END (REPLACE CLEARANCE LIGHT BULB) (See «DISASSEMBLY» )
4. CHECK HEADLIGHT ASSEMBLY (OPERATION) Temporarily replace the headlight with a new or normally functioning one (see «REMOVAL» ). Check for DTC (see «DTC CHECK/CLEAR» ). OK: DTC B2482 output does not occur. NG: REPLACE MULTIPLEX NETWORK FRONT LIGHT ECU OK: END (REPLACE HEADLIGHT ASSEMBLY) (See «REMOVAL» )

Scheme 35

Scheme 36

Scheme 37

Scheme 38

Scheme 39

1. CONFIRM LIGHT POSITION Check the malfunctioning personal light. Result RESULT CHART Result Proceed to Rear personal light A Front personal light B B: REPLACE MAP LIGHT ASSEMBLY (See «REMOVAL» ) A: Go to next step
2. CHECK HARNESS AND CONNECTOR (MAP LIGHT - BATTERY AND BODY GROUND) Disconnect the X4 ECU connector. Measure the resistance to the according value(s) in the table below. Standard resistance RESISTANCE SPECIFIED CONDITIONS Tester Connection Condition Specified Condition X4-16 (GND9) - Body ground Always Below 1 ohms Measure the voltage to the according value(s) in the table below. Standard voltage VOLTAGE SPECIFIED CONDITIONS Tester Connection Condition Specified Condition X4-6 (+B) - Body ground Always 11 to 14 V X4-27 (DOME) - Body ground Always 11 to 14 V NG: REPAIR OR REPLACE HARNESS OR CONNECTOR OK: Go to next step
3. INSPECT REAR MAP LIGHT ASSEMBLY Remove the rear map light (see «REMOVAL» ). Apply battery voltage to the map light and check the rear map light. OK VOLTAGE MEASURING CONDITIONS Measurement Condition Specified Condition Battery positive (+) --> Terminal 10 (B) Battery negative (-) --> Terminal 3 (RGND) Rear personal light RH comes on Battery positive (+) --> Terminal 2 (B) Battery negative (-) --> Terminal 3 (RGND) Rear personal light LH comes on Measure the resistance to the according value(s) in the table below. Standard resistance RESISTANCE SPECIFIED CONDITIONS Tester Connection Switch Condition Specified Condition 4 (E) - 3 (RGND) Rear LH switch ON Below 1 ohms 5 (E) - 3 (RGND) Rear RH switch ON Below 1 ohms 4 (E) - 3 (RGND) Front LH, RH switch OFF 10 kohms or higher 5 (E) - 3 (RGND) Front LH, RH switch OFF 10 kohms or higher NG: REPLACE REAR MAP LIGHT ASSEMBLY (See «REMOVAL» ) OK: Go to next step
4. CHECK HARNESS AND CONNECTOR (MAP LIGHT - REAR MAP LIGHT) Disconnect the X4, X6 and X12 light connectors. Measure the resistance to the according value(s) in the table below. Standard resistance RESISTANCE SPECIFIED CONDITIONS Tester Connection Condition Specified Condition X4-3 (RLSW) - X12-4 (E) Always Below 1 ohms X4-4 (RRSW) - X12-5 (E) Always Below 1 ohms X6-7 (RLMP) - X12-2 (B) Always Below 1 ohms X6-8 (RRMP) - X12-10 (B) Always Below 1 ohms X4-15 (GND6) - X12-3 (RGND) Always Below 1 ohms X4-3 (RLSW) - Body ground Always 10 kohms or higher X4-4 (RRSW) - Body ground Always 10 kohms or higher X6-7 (RLMP) - Body ground Always 10 kohms or higher X6-8 (RRMP) - Body ground Always 10 kohms or higher X4-15 (GND6) - Body ground Always 10 kohms or higher NG: REPAIR OR REPLACE HARNESS OR CONNECTOR OK: REPLACE MAP LIGHT ASSEMBLY (See «REMOVAL» )

Scheme 40

See also:
• CAN COMMUNICATION SYSTEM
• DTC CHECK/CLEAR
• PROBLEM SYMPTOMS TABLE
• REMOVAL
• REMOVAL
• AIRBAG SYSTEM
• REMOVAL
• REMOVAL