Lighting (Diagnostic Codes & Circuit Tests): Overview Lexus RX III

DESCRIPTION

The automatic light control sensor detects ambient light, converts it into an electrical signal, and outputs it to the main body ECU (multiplex network body ECU). The main body ECU (multiplex network body ECU) turns on or off the headlights and taillights according to the signal.

Scheme 173

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Scheme 177

1. READ VALUE USING TECHSTREAM Connect the Techstream to the DLC3. Turn the engine switch on (IG). Turn the Techstream on. Enter the following menu items: Body Electrical / Main Body / Data List. Read the display on the Techstream. MAIN BODY Tester Display Measurement Item/Range Normal Condition Diagnostic Note Illumination Rate Illumination rate information/0 ms to 99.99 ms Value is output according to ambient light levels - OK Normal condition listed above is displayed. NG --> See step 2 OK --> See step 5
2. CHECK HARNESS AND CONNECTOR (MAIN BODY ECU - AUTOMATIC LIGHT CONTROL SENSOR) Disconnect the H3 automatic light control sensor connector. Disconnect the F13 main body ECU (multiplex network body ECU) connector. Measure the resistance according to the value(s) in the table below. Standard Resistance Tester Connection Condition Specified Condition F13-22 (CLTE) - H3-3 (CLTE) Always Below 1 ohms F13-21 (CLTS) - H3-5 (CLTS) Always Below 1 ohms F13-20 (CLTB) - H3-6 (CLTB) Always Below 1 ohms F13-22 (CLTE) - Body ground Always 10 kohms or higher F13-21 (CLTS) - Body ground Always 10 kohms or higher F13-20 (CLTB) - Body ground Always 10 kohms or higher TEXT IN ILLUSTRATION *1 Front view of wire harness connector (to Automatic Light Control Sensor) *2 Front view of wire harness connector (to Main Body ECU (Multiplex Network Body ECU)) NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR OK: Go to next step
3. INSPECT MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU) Reconnect the F13 main body ECU (multiplex network body ECU) connector. Measure the voltage and resistance according to the value(s) in the table below. Standard Voltage Tester Connection Condition Specified Condition F13-20 (CLTB) - F13-22 (CLTE) Engine switch off Below 1 V Engine switch on (IG) 11 to 14 V Standard Resistance Tester Connection Condition Specified Condition F13-22 (CLTE) - Body ground Always Below 1 ohms TEXT IN ILLUSTRATION *1 Component with harness connected (Main Body ECU (Multiplex Network Body ECU)) NG --> See step 5 OK: Go to next step
4. INSPECT AUTOMATIC LIGHT CONTROL SENSOR Reconnect the H3 automatic light control sensor connector. Connect an oscilloscope to the automatic light control sensor connector. TEXT IN ILLUSTRATION *1 Component with harness connected (Automatic Light Control Sensor) Check the waveform. OK Tester Connection Tool Setting Condition Specified Condition H3-3 (CLTE) - H3-5 (CLTS) 5 V/DIV., 5 ms./DIV. Engine switch on (IG), light control switch in AUTO position Correct waveform is as shown HINT: If the ambient light becomes brighter, width A becomes narrower. NG --> See step 6 OK --> See step 5
5. REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU). Refer to «COMPONENTS»
6. REPLACE AUTOMATIC LIGHT CONTROL SENSOR. Refer to «COMPONENTS»

The DTC is stored when the main body ECU (multiplex network body ECU) detects malfunctions in the inner rear view mirror assembly.

Scheme 178

The DTC is stored when the main body ECU (multiplex network body ECU) detects malfunctions in the inner rear view mirror assembly.

The DTC is stored when the main body ECU (multiplex network body ECU) detects malfunctions in the automatic high beam system.

The DTC is stored when the main body ECU (multiplex network body ECU) detects malfunctions in the automatic high beam system.

The DTC is stored when the main body ECU (multiplex network body ECU) detects malfunctions in the camera (inner rear view mirror assembly).

The DTC is stored when the main body ECU (multiplex network body ECU) detects malfunctions in the camera (inner rear view mirror assembly).

1. The DTC B124D is stored when the main body ECU (multiplex network body ECU) detects malfunctions in the LIN communication system.
2. The DTC B2432 is stored when the AFS ECU (headlight swivel ECU assembly) detects malfunctions in the LIN communication system.

Scheme 179

1. The DTC B124D is stored when the main body ECU (multiplex network body ECU) detects malfunctions in the LIN communication system.
2. The DTC B2432 is stored when the AFS ECU (headlight swivel ECU assembly) detects malfunctions in the LIN communication system.

These DTCs are stored when the AFS ECU (headlight swivel ECU assembly) detects errors in its own communication with the headlight swivel motor.

Scheme 180

These DTCs are stored when the AFS ECU (headlight swivel ECU assembly) detects errors in its own communication with the headlight swivel motor.

Each swivel motor receives a signal from the AFS ECU (headlight swivel ECU assembly) to operate and sends a signal indicating the direction of the headlight and condition of the headlight swivel motor to the AFS ECU (headlight swivel ECU assembly).

Each swivel motor receives a signal from the AFS ECU (headlight swivel ECU assembly) to operate and sends a signal indicating the direction of the headlight and condition of the headlight swivel motor to the AFS ECU (headlight swivel ECU assembly).

The AFS ECU (headlight swivel ECU assembly) receives signals indicating the swerve-angle from the steering angle sensor (spiral cable sub-assembly) using CAN communication.

Scheme 181

The AFS ECU (headlight swivel ECU assembly) receives signals indicating the swerve-angle from the steering angle sensor (spiral cable sub-assembly) using CAN communication.

The AFS ECU (headlight swivel ECU assembly) receives signals indicating the front right wheel speed from the skid control ECU using CAN communication.

Scheme 182

The AFS ECU (headlight swivel ECU assembly) receives signals indicating the front right wheel speed from the skid control ECU using CAN communication.

w/o Air Suspension System

The DTC is stored when the AFS ECU (headlight swivel ECU assembly) detects malfunctions in the rear height control sensor sub-assembly RH power source or rear height control sensor sub-assembly RH.

w/ Air Suspension System

1. The DTC is stored when the AFS ECU (headlight swivel ECU assembly) detects malfunctions in the front height control sensor LH power source or front height control sensor LH.
2. The DTC is stored when the AFS ECU (headlight swivel ECU assembly) detects malfunctions in the rear height control sensor LH power source or rear height control sensor LH.

Scheme 183

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1. CHECK FOR DTC Clear the DTCs. Refer to «DTC CHECK / CLEAR». Check for DTCs. Refer to «DTC CHECK / CLEAR». OK DTC B2416 is not output. NG --> See step 2 OK --> See step 15
2. CHECK VEHICLE CONDITION Check the vehicle condition. RESULT Result Proceed to w/o Air Suspension System A w/ Air Suspension System B B --> See step 7 A: Go to next step
3. READ VALUE USING TECHSTREAM Connect the Techstream to the DLC3. Turn the engine switch on (IG). Turn the Techstream on. Enter the following menus: Body Electrical / AFS / Data List. Read the display on the Techstream. AFS Tester Display Measurement Item/Range Normal Condition Height Sens Pw Supply Val Rear height control sensor power supply value / 0 to 6.25 V Approx. 5.0 V OK Normal conditions listed above are displayed. NG --> See step 5 OK: Go to next step
4. INSPECT REAR HEIGHT CONTROL SENSOR SUB-ASSEMBLY RH Connect 3 dry cell batteries (1.5 V) in series. Remove the rear height control sensor sub-assembly RH. Refer to «COMPONENTS». Connect a positive (+) lead from the battery to terminal 3 (SHB) and a negative (-) lead from the battery to terminal 1 (SHG). Measure the voltage between terminals 2 (SHRR) and 1 (SHG) while slowly moving the link up and down. Standard Voltage Tester Connection Condition Specified Condition 2 (SHRR) - 1 (SHG) +45° (High) 4.05 V 0° (Normal) 2.25 V -45° (Low) 0.45 V TEXT IN ILLUSTRATION *1 Component without harness connected (Rear Height Control Sensor Sub-assembly RH) NG --> See step 12 OK --> See step 13
5. CHECK HARNESS AND CONNECTOR (AFS ECU - REAR HEIGHT CONTROL SENSOR SUB-ASSEMBLY RH) Disconnect the A53 AFS ECU (headlight swivel ECU assembly) connector. Disconnect the R4 rear height control sensor sub-assembly RH connector. Measure the resistance according to the value(s) in the table below. Standard Resistance Tester Connection Condition Specified Condition A53-18 (SBR) - R4-3 (SHB) Always Below 1 ohms A53-19 (SHRL) - R4-2 (SHRR) Always Below 1 ohms A53-21 (SGR) - R4-1 (SHG) Always Below 1 ohms A53-18 (SBR) - Body ground Always 10 kohms or higher A53-19 (SHRL) - Body ground Always 10 kohms or higher A53-21 (SGR) - Body ground Always 10 kohms or higher TEXT IN ILLUSTRATION *1 Front view of wire harness connector (to Rear Height Control Sensor Sub-assembly RH) *2 Front view of wire harness connector (to AFS ECU (Headlight Swivel ECU Assembly)) NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR OK: Go to next step
6. INSPECT REAR HEIGHT CONTROL SENSOR SUB-ASSEMBLY RH Connect 3 dry cell batteries (1.5 V) in series. Remove the rear height control sensor sub-assembly RH. Refer to «COMPONENTS». Connect a positive (+) lead from the battery to terminal 3 (SHB) and a negative (-) lead from the battery to terminal 1 (SHG). Measure the voltage between terminals 2 (SHRR) and 1 (SHG) while slowly moving the link up and down. Standard Voltage Tester Connection Condition Specified Condition 2 (SHRR) - 1 (SHG) +45° (High) 4.05 V 0° (Normal) 2.25 V -45° (Low) 0.45 V TEXT IN ILLUSTRATION *1 Component without harness connected (Rear Height Control Sensor Sub-assembly RH) NG --> See step 12 OK --> See step 13
7. CHECK FOR DTC (AIR SUSPENSION SYSTEM) Check for DTCs. Refer to «DTC CHECK / CLEAR». OK DTC "C1712 Front Height Control Sensor LH Circuit Malfunction" and "C1714 Rear Height Control Sensor LH Circuit Malfunction" are not output. NG --> See step 14 OK: Go to next step
8. READ VALUE USING TECHSTREAM Connect the Techstream to the DLC3. Turn the engine switch on (IG). Turn the Techstream on. Enter the following menus: Body Electrical / AFS / Data List. Read the display on the Techstream. AFS Tester Display Measurement Item/Range Normal Condition Height Sens Pw Supply Val Rear height control sensor power supply value / 0 to 6.25 V Approx. 5.0 V OK Normal conditions listed above are displayed. NG --> See step 10 OK: Go to next step
9. REPLACE SUSPENSION CONTROL ECU Temporarily replace the suspension control ECU with a new or normally functioning one. Refer to «DTC C1711: Front Height Control Sensor RH Circuit Malfunction; DTC C1712: Front Height Control Sensor LH Circuit Malfunction; DTC C1713: Rear Height Control Sensor RH Circuit Malfunction; DTC C1714: Rear Height Control Sensor LH Circuit Malfunction». Check for DTCs. Refer to «DTC CHECK / CLEAR». OK DTC B2416 is not output. NG --> See step 13 OK --> END
10. CHECK HARNESS AND CONNECTOR (SUSPENSION CONTROL ECU - AFS ECU) Disconnect the A53 AFS ECU (headlight swivel ECU assembly) connector. Disconnect the A54 and A55 suspension control ECU connectors. Measure the resistance according to the value(s) in the table below. Standard Resistance Tester Connection Condition Specified Condition A53-17 (SHFL) - A55-23 (SHF2) Always Below 1 ohms A53-18 (SBR) - A55-22 (SHB5) Always Below 1 ohms A53-19 (SHRL) - A54-27 (SHR2) Always Below 1 ohms A53-21 (SGR) - A55-21 (SHG5) Always Below 1 ohms A53-17 (SHFL) - Body ground Always 10 kohms or higher A53-18 (SBR) - Body ground Always 10 kohms or higher A53-19 (SHRL) - Body ground Always 10 kohms or higher A53-21 (SGR) - Body ground Always 10 kohms or higher TEXT IN ILLUSTRATION *1 Front view of wire harness connector (to AFS ECU (Headlight Swivel ECU Assembly)) *2 Front view of wire harness connector (to Suspension Control ECU) *3 Front view of wire harness connector (to Suspension Control ECU) NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR OK: Go to next step
11. REPLACE SUSPENSION CONTROL ECU Temporarily replace the suspension control ECU with a new or normally functioning one. Refer to «COMPONENTS». Check for DTCs. Refer to «DTC CHECK / CLEAR». OK DTC B2416 is not output. NG --> See step 13 OK --> END
12. REPLACE REAR HEIGHT CONTROL SENSOR SUB-ASSEMBLY RH. Refer to «COMPONENTS»
13. REPLACE AFS ECU (HEADLIGHT SWIVEL ECU ASSEMBLY). Refer to «COMPONENTS»
14. GO TO AIR SUSPENSION SYSTEM. Refer to «DTC C1711: Front Height Control Sensor RH Circuit Malfunction; DTC C1712: Front Height Control Sensor LH Circuit Malfunction; DTC C1713: Rear Height Control Sensor RH Circuit Malfunction; DTC C1714: Rear Height Control Sensor LH Circuit Malfunction»
15. USE SIMULATION METHOD TO CHECK. Refer to «HOW TO PROCEED WITH TROUBLESHOOTING»

w/o Air Suspension System

The DTC is stored when the AFS ECU (headlight swivel ECU assembly) detects malfunctions in the rear height control sensor sub-assembly RH power source or rear height control sensor sub-assembly RH.

w/ Air Suspension System

1. The DTC is stored when the AFS ECU (headlight swivel ECU assembly) detects malfunctions in the front height control sensor LH power source or front height control sensor LH.
2. The DTC is stored when the AFS ECU (headlight swivel ECU assembly) detects malfunctions in the rear height control sensor LH power source or rear height control sensor LH.

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

Scheme 187

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

w/o Air Suspension System

The AFS ECU (headlight swivel ECU assembly) receives signals indicating the height of the vehicle from the rear height control sensor sub-assembly RH.

w/ Air Suspension System

The AFS ECU (headlight swivel ECU assembly) receives signals regarding the height of the vehicle from the suspension control ECU.

Scheme 188

Scheme 189

1. CHECK FOR DTC Clear the DTCs. Refer to «DTC CHECK / CLEAR». Check for DTCs. Refer to «DTC CHECK / CLEAR». OK DTC B241A is not output. NG --> See step 2 OK --> See step 15
2. CHECK VEHICLE CONDITION Check the vehicle condition. RESULT Result Proceed to w/o Air Suspension System A w/ Air Suspension System B B --> See step 7 A: Go to next step
3. READ VALUE USING TECHSTREAM Connect the Techstream to the DLC3. Turn the engine switch on (IG). Turn the Techstream on. Enter the following menus: Body Electrical / AFS / Data List. Read the display on the Techstream. AFS Tester Display Measurement Item/Range Normal Condition Diagnostic Note Height Sens Pw Supply Val Rear height control sensor power supply value / 0 to 6.25 V Approx. 5.0 V - Rr Height Sens Signal Val Rear height control sensor signal value / 0 to 5 V Approx. 2.5 V (When the vehicle is level) Value is changed according to vehicle height OK Normal conditions listed above are displayed. NG --> See step 5 OK: Go to next step
4. INSPECT REAR HEIGHT CONTROL SENSOR SUB-ASSEMBLY RH Connect 3 dry cell batteries (1.5 V) in series. Remove the rear height control sensor sub-assembly RH. Refer to «COMPONENTS». Connect a positive (+) lead from the battery to terminal 3 (SHB) and a negative (-) lead from the battery to terminal 1 (SHG). Measure the voltage between terminals 2 (SHRR) and 1 (SHG) while slowly moving the link up and down. Standard Voltage Tester Connection Condition Specified Condition 2 (SHRR) - 1 (SHG) +45° (High) 4.05 V 0° (Normal) 2.25 V -45° (Low) 0.45 V TEXT IN ILLUSTRATION *1 Component without harness connected (Rear Height Control Sensor Sub-assembly RH) NG --> See step 12 OK --> See step 13
5. CHECK HARNESS AND CONNECTOR (AFS ECU - REAR HEIGHT CONTROL SENSOR SUB-ASSEMBLY RH) Disconnect the A53 AFS ECU (headlight swivel ECU assembly) connector. Disconnect the R4 rear height control sensor sub-assembly RH connector. Measure the resistance according to the value(s) in the table below. Standard Resistance Tester Connection Condition Specified Condition A53-18 (SBR) - R4-3 (SHB) Always Below 1 ohms A53-19 (SHRL) - R4-2 (SHRR) Always Below 1 ohms A53-21 (SGR) - R4-1 (SHG) Always Below 1 ohms A53-18 (SBR) - Body ground Always 10 kohms or higher A53-19 (SHRL) - Body ground Always 10 kohms or higher A53-21 (SGR) - Body ground Always 10 kohms or higher TEXT IN ILLUSTRATION *1 Front view of wire harness connector (to Rear Height Control Sensor Sub-assembly RH) *2 Front view of wire harness connector (to AFS ECU (Headlight Swivel ECU Assembly)) NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR OK: Go to next step
6. INSPECT REAR HEIGHT CONTROL SENSOR SUB-ASSEMBLY RH Connect 3 dry cell batteries (1.5 V) in series. Remove the rear height control sensor sub-assembly RH. Refer to «COMPONENTS». Connect a positive (+) lead from the battery to terminal 3 (SHB) and a negative (-) lead from the battery to terminal 1 (SHG). Measure the voltage between terminals 2 (SHRR) and 1 (SHG) while slowly moving the link up and down. Standard Voltage Tester Connection Condition Specified Condition 2 (SHRR) - 1 (SHG) +45° (High) 4.05 V 0° (Normal) 2.25 V -45° (Low) 0.45 V TEXT IN ILLUSTRATION *1 Component without harness connected (Rear Height Control Sensor Sub-assembly RH) NG --> See step 12 OK --> See step 13
7. CHECK FOR DTC (AIR SUSPENSION SYSTEM) Check for DTCs. Refer to «DTC CHECK / CLEAR». OK DTC "C1714 Rear Height Control Sensor LH Circuit Malfunction" is not output. NG --> See step 14 OK: Go to next step
8. READ VALUE USING TECHSTREAM Connect the Techstream to the DLC3. Turn the engine switch on (IG). Turn the Techstream on. Enter the following menus: Body Electrical / AFS / Data List. Read the display on the Techstream. AFS Tester Display Measurement Item/Range Normal Condition Diagnostic Note Height Sens Pw Supply Val Rear height control sensor power supply value / 0 to 6.25 V Approx. 5.0 V - Rr Height Sens Signal Val Rear height control sensor signal value / 0 to 5 V Approx. 2.5 V (When the vehicle is level) Value is changed according to vehicle height OK Normal conditions listed above are displayed. NG --> See step 10 OK: Go to next step
9. REPLACE SUSPENSION CONTROL ECU Temporarily replace the suspension control ECU with a new or normally functioning one. Refer to «COMPONENTS». Check for DTCs. Refer to «DTC CHECK / CLEAR». OK DTC B2416 is not output. NG --> See step 13 OK --> END
10. CHECK HARNESS AND CONNECTOR (SUSPENSION CONTROL ECU - AFS ECU) Disconnect the A53 AFS ECU (headlight swivel ECU assembly) connector. Disconnect the A54 and A55 suspension control ECU connectors. Measure the resistance according to the value(s) in the table below. Standard Resistance Tester Connection Condition Specified Condition A53-18 (SBR) - A55-22 (SHB5) Always Below 1 ohms A53-19 (SHRL) - A54-27 (SHR2) Always Below 1 ohms A53-21 (SGR) - A55-21 (SHG5) Always Below 1 ohms A53-18 (SBR) - Body ground Always 10 kohms or higher A53-19 (SHRL) - Body ground Always 10 kohms or higher A53-21 (SGR) - Body ground Always 10 kohms or higher TEXT IN ILLUSTRATION *1 Front view of wire harness connector (to AFS ECU (Headlight Swivel ECU Assembly)) *2 Front view of wire harness connector (to Suspension Control ECU) *3 Front view of wire harness connector (to Suspension Control ECU) NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR OK: Go to next step
11. REPLACE SUSPENSION CONTROL ECU Temporarily replace the suspension control ECU with a new or normally functioning one. Refer to «COMPONENTS». Check for DTCs. Refer to «DTC CHECK / CLEAR». OK DTC B2416 is not output. NG --> See step 13 OK --> END
12. REPLACE REAR HEIGHT CONTROL SENSOR SUB-ASSEMBLY RH. Refer to «COMPONENTS»
13. REPLACE AFS ECU (HEADLIGHT SWIVEL ECU ASSEMBLY). Refer to «COMPONENTS»
14. GO TO AIR SUSPENSION SYSTEM. Refer to «DTC C1711: Front Height Control Sensor RH Circuit Malfunction; DTC C1712: Front Height Control Sensor LH Circuit Malfunction; DTC C1713: Rear Height Control Sensor RH Circuit Malfunction; DTC C1714: Rear Height Control Sensor LH Circuit Malfunction»
15. USE SIMULATION METHOD TO CHECK. Refer to «HOW TO PROCEED WITH TROUBLESHOOTING»

w/o Air Suspension System

The AFS ECU (headlight swivel ECU assembly) receives signals indicating the height of the vehicle from the rear height control sensor sub-assembly RH.

w/ Air Suspension System

The AFS ECU (headlight swivel ECU assembly) receives signals regarding the height of the vehicle from the suspension control ECU.

The AFS ECU (headlight swivel ECU assembly) receives signals indicating the front height of the vehicle from the suspension control ECU.

Scheme 190

Scheme 191

1. CHECK FOR DTC Clear the DTCs. Refer to «DTC CHECK / CLEAR». Check for DTCs. Refer to «DTC CHECK / CLEAR». OK DTC B241B is not output. NG --> See step 2 OK --> See step 8
2. CHECK FOR DTC Check for DTCs. Refer to «DTC CHECK / CLEAR». OK DTC "C1712/12 Front Height Control Sensor LH Circuit Malfunction" is not output. NG --> See step 9 OK: Go to next step
3. READ VALUE USING TECHSTREAM Connect the Techstream to the DLC3. Turn the engine switch on (IG). Enter the following menus: Body Electrical / AFS / Data List. Read the display on the Techstream. AFS Tester Display Measurement Item/Range Normal Condition Diagnostic Note Height Sens Pw Supply Val Height control sensor power supply value / 0 to 6.25 V Approx. 5.0 V - Fr Height Sens Signal Val Front height control sensor signal value / 0 to 5 V Approx. 2.5 V (When the vehicle is level) Value is changed according to vehicle height OK Normal conditions listed above are displayed. NG --> See step 5 OK: Go to next step
4. REPLACE SUSPENSION CONTROL ECU Temporarily replace the suspension control ECU with a new or normally functioning one. Refer to «COMPONENTS». Check for DTCs. Refer to «DTC CHECK / CLEAR». OK DTC B241B is not output. NG --> See step 7 OK --> END
5. CHECK HARNESS AND CONNECTOR (AFS ECU - SUSPENSION CONTROL ECU) Disconnect the A53 AFS ECU (headlight swivel ECU assembly) connector. Disconnect the A55 suspension control ECU connector. Measure the resistance according to the value(s) in the table below. Standard Resistance Tester Connection Condition Specified Condition A53-17 (SHFL) - A55-23 (SHF2) Always Below 1 ohms A53-18 (SBR) - A55-22 (SHB5) Always Below 1 ohms A53-21 (SGR) - A55-21 (SHG5) Always Below 1 ohms A53-17 (SHFL) - Body ground Always 10 kohms or higher A53-18 (SBR) - Body ground Always 10 kohms or higher A53-21 (SGR) - Body ground Always 10 kohms or higher TEXT IN ILLUSTRATION *1 Front view of wire harness connector (to AFS ECU (Headlight Swivel ECU Assembly)) *2 Front view of wire harness connector (to Suspension Control ECU) NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR OK: Go to next step
6. REPLACE SUSPENSION CONTROL ECU Temporarily replace the suspension control ECU with a new or normally functioning one. Refer to «COMPONENTS». Check for DTCs. Refer to «DTC CHECK / CLEAR». OK DTC B241B is not output. NG --> See step 7 OK --> END
7. REPLACE AFS ECU (HEADLIGHT SWIVEL ECU ASSEMBLY). Refer to «COMPONENTS»
8. USE SIMULATION METHOD TO CHECK. Refer to «HOW TO PROCEED WITH TROUBLESHOOTING»
9. GO TO AIR SUSPENSION SYSTEM. Refer to «DTC C1711: Front Height Control Sensor RH Circuit Malfunction; DTC C1712: Front Height Control Sensor LH Circuit Malfunction; DTC C1713: Rear Height Control Sensor RH Circuit Malfunction; DTC C1714: Rear Height Control Sensor LH Circuit Malfunction»

The AFS ECU (headlight swivel ECU assembly) receives signals indicating the front height of the vehicle from the suspension control ECU.

When the AFS ECU (headlight swivel ECU assembly) detects a malfunction in itself, the DTC is stored.

When the AFS ECU (headlight swivel ECU assembly) detects a malfunction in itself, the DTC is stored.

The AFS ECU (headlight swivel ECU assembly) receives a signal from each headlight leveling motor using LIN communication.

The AFS ECU (headlight swivel ECU assembly) receives a signal from each headlight leveling motor using LIN communication.

The AFS ECU (headlight swivel ECU assembly) stores this DTC if initialization has not been performed after the ECU was replaced.

The AFS ECU (headlight swivel ECU assembly) stores this DTC if initialization has not been performed after the ECU was replaced.

The AFS ECU (headlight swivel ECU assembly) sets this DTC if the vehicle specifications have not been stored in the ECU.

The AFS ECU (headlight swivel ECU assembly) sets this DTC if the vehicle specifications have not been stored in the ECU.

The AFS ECU (headlight swivel ECU assembly) stores this DTC if the sensor value received from the height control sensor is out of range when performing initialization of the AFS ECU (headlight swivel ECU assembly); for example, the vehicle is not level or being jacked up.

The AFS ECU (headlight swivel ECU assembly) stores this DTC if the sensor value received from the height control sensor is out of range when performing initialization of the AFS ECU (headlight swivel ECU assembly); for example, the vehicle is not level or being jacked up.

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

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

The DTCs are stored when the CAN communication system is malfunctioning.

The DTCs are stored when the CAN communication system is malfunctioning.

The main body ECU (multiplex network body ECU) receives the following switch information

1. Light control switch position off, tail, head or AUTO
2. Dimmer switch position high, low or high flash (pass)
3. Fog light switch position on or off

Scheme 192

Scheme 193

Scheme 194

1. READ VALUE USING TECHSTREAM Connect the Techstream to the DLC3. Turn the engine switch on (IG). Turn the Techstream on. Enter the following menus: Body Electrical / Main Body / Data List. Read the display on the Techstream. MAIN BODY Tester Display Measurement Item/Range Normal Condition Dimmer Hi SW Dimmer switch high position signal/ON or OFF ON: Dimmer switch in high or high flash (pass) position OFF: Dimmer switch in low position Passing Light SW Dimmer switch high flash (pass) position signal/ON or OFF ON: Dimmer switch in high flash (pass) position OFF: Dimmer switch not in high flash (pass) position Front Fog Light SW Front fog light switch signal/ON or OFF ON: Front fog light switch on OFF: Front fog light switch off Light Auto SW Light control switch AUTO position signal/ON or OFF ON: Light control switch in AUTO position OFF: Light control switch not in AUTO position Headlight SW Light control switch head position signal/ON or OFF ON: Light control switch in head position OFF: Light control switch not in head position Taillight SW Light control switch tail position signal/ON or OFF ON: Light control switch in tail or head position OFF: Light control switch in neither tail nor head position OK Normal conditions listed above are displayed. NG --> See step 2 OK --> See step 4
2. INSPECT HEADLIGHT DIMMER SWITCH ASSEMBLY HINT: Inspect the items that did not change as a result of monitoring the Data List. Remove the headlight dimmer switch assembly. Refer to «COMPONENTS». Measure the resistance according to the value(s) in the table below. Standard Resistance LIGHT CONTROL SWITCH Tester Connection Switch Condition Specified Condition 12 (EL) - 18 (T) Light control switch off 10 kohms or higher 18 (T) - 19 (A) Light control switch off 10 kohms or higher 19 (A) - 20 (H) Light control switch off 10 kohms or higher 12 (EL) - 18 (T) Light control switch in tail position Below 1 ohms 12 (EL) - 18 (T) Light control switch in head position Below 1 ohms 18 (T) - 20 (H) Light control switch in head position Below 1 ohms 12 (EL) - 19 (A) Light control switch in AUTO position Below 1 ohms DIMMER SWITCH Tester Connection Switch Condition Specified Condition 11 (HU) - 12 (EL) Dimmer switch in low position 10 kohms or higher 11 (HU) - 12 (EL) Dimmer switch in high position Below 1 ohms 12 (EL) - 17 (HF) Dimmer switch in high flash position Below 1 ohms FOG LIGHT SWITCH Tester Connection Switch Condition Specified Condition 3 (LFG) - 4 (BFG) Fog light switch off 10 kohms or higher 3 (LFG) - 4 (BFG) Fog light switch on Below 1 ohms OK Headlight dimmer switch assembly is normal. TEXT IN ILLUSTRATION *1 Component without harness connected (Headlight Dimmer Switch Assembly) NG --> See step 5 OK: Go to next step
3. CHECK HARNESS AND CONNECTOR (MAIN BODY ECU - HEADLIGHT DIMMER SWITCH ASSEMBLY) Disconnect the F39 headlight dimmer switch assembly connector. Disconnect the F13 main body ECU (multiplex network body ECU) connector. Measure the resistance according to the value(s) in the table below. Standard Resistance Tester Connection Condition Specified Condition F39-4 (BFG) - F13-27 (FFOG) Always Below 1 ohms F39-11 (HU) - F13-5 (HU) Always Below 1 ohms F39-17 (HF) - F13-8 (HF) Always Below 1 ohms F39-18 (T) - F13-30 (TAIL) Always Below 1 ohms F39-19 (A) - F13-28 (A) Always Below 1 ohms F39-20 (H) - F13-29 (HEAD) Always Below 1 ohms F39-4 (BFG) - Body ground Always 10 kohms or higher F39-11 (HU) - Body ground Always 10 kohms or higher F39-17 (HF) - Body ground Always 10 kohms or higher F39-18 (T) - Body ground Always 10 kohms or higher F39-19 (A) - Body ground Always 10 kohms or higher F39-20 (H) - Body ground Always 10 kohms or higher F39-12 (EL) - Body ground Always Below 1 ohms F39-3 (LFG) - Body ground Always Below 1 ohms TEXT IN ILLUSTRATION *1 Front view of wire harness connector (to Headlight Dimmer Switch Assembly) *2 Front view of wire harness connector (to Main Body ECU (Multiplex Network Body ECU)) NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR OK --> See step 6
4. PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE. Refer to «PROBLEM SYMPTOMS TABLE»
5. REPLACE HEADLIGHT DIMMER SWITCH ASSEMBLY. Refer to «COMPONENTS»
6. REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU). Refer to «COMPONENTS»

The main body ECU (multiplex network body ECU) receives the following switch information

1. Light control switch position off, tail, head or AUTO
2. Dimmer switch position high, low or high flash (pass)
3. Fog light switch position on or off

The main body ECU (multiplex network body ECU) turn the Bi-XENON relay on to activate the headlight solenoid built into the headlight unit, then the headlights are changed from low beams to high beams.

Scheme 195

The main body ECU (multiplex network body ECU) turn the Bi-XENON relay on to activate the headlight solenoid built into the headlight unit, then the headlights are changed from low beams to high beams.

The main body ECU (multiplex network body ECU) controls the daytime running lights.

HINT

1. The power distributor (engine room junction block assembly) has a headlight control function. This function dims the daytime running lights in accordance with operation signals from the main body ECU (multiplex network body ECU) while the daytime running light system is operating.
2. The power distributor (engine room junction block assembly) dims the daytime running lights using a duty control.

Scheme 196

The main body ECU (multiplex network body ECU) controls the daytime running lights.

HINT

1. The power distributor (engine room junction block assembly) has a headlight control function. This function dims the daytime running lights in accordance with operation signals from the main body ECU (multiplex network body ECU) while the daytime running light system is operating.
2. The power distributor (engine room junction block assembly) dims the daytime running lights using a duty control.

The main body ECU (multiplex network body ECU) controls the front fog light relay.

Scheme 197

The main body ECU (multiplex network body ECU) controls the front fog light relay.

The outer mirror control ECU receives the signal from the main body ECU (multiplex network body ECU) to control the door mirror foot light.

Scheme 198

Scheme 199

1. PERFORM ACTIVE TEST USING TECHSTREAM Connect the Techstream to the DLC3. Turn the engine switch on (IG). Turn the Techstream on. Enter the following menus: Body Electrical / Mirror L or Mirror R / Active Test. Check that the door mirror foot lights operate. MIRROR L Tester Display Test Part Control Range Foot Light Door mirror foot light LH ON/OFF MIRROR R Tester Display Test Part Control Range Foot Light Door mirror foot light RH ON/OFF Result Result Proceed to OK A NG (Door mirror foot light LH does not comes on) B NG (Door mirror foot light RH does not comes on) C C --> See step 3 B --> See step 2 A --> See step 8
2. INSPECT OUTER REAR VIEW MIRROR ASSEMBLY LH Remove the outer rear view mirror assembly LH. Refer to «COMPONENTS». Connect a positive (+) lead from the battery to terminal 2 and a negative (-) lead to terminal 12. Check that the outer mirror foot light comes on. OK Door mirror foot light comes on. TEXT IN ILLUSTRATION *1 Component without harness connected (Outer Rear View Mirror Assembly LH) NG --> See step 4 OK --> See step 6
3. INSPECT OUTER REAR VIEW MIRROR ASSEMBLY RH Remove the outer rear view mirror assembly RH. Refer to «COMPONENTS». Connect a positive (+) lead from the battery to terminal 2 and a negative (-) lead to terminal 12. Check that the outer mirror foot light comes on. OK Door mirror foot light comes on. TEXT IN ILLUSTRATION *1 Component without harness connected (Outer Rear View Mirror Assembly RH) NG --> See step 5 OK --> See step 7
4. REPLACE OUTER REAR VIEW MIRROR ASSEMBLY LH. Refer to «COMPONENTS»
5. REPLACE OUTER REAR VIEW MIRROR ASSEMBLY RH. Refer to «COMPONENTS»
6. REPLACE OUTER MIRROR CONTROL ECU ASSEMBLY (LH). Refer to «COMPONENTS»
7. REPLACE OUTER MIRROR CONTROL ECU ASSEMBLY (RH). Refer to «COMPONENTS»
8. PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE. Refer to «PROBLEM SYMPTOMS TABLE»

The outer mirror control ECU receives the signal from the main body ECU (multiplex network body ECU) to control the door mirror foot light.

The main body ECU (multiplex network body ECU) detects the condition of the parking brake switch.

Scheme 200

Scheme 201

Scheme 202

Scheme 203

1. READ VALUE USING TECHSTREAM Connect the Techstream to the DLC3. Turn the engine switch on (IG). Turn the Techstream on. Enter the following menus: Body Electrical / Main Body / Data List. Read the display on the Techstream. MAIN BODY Tester Display Measurement Item/Range Normal Condition Parking Brake SW Parking brake switch signal/ON or OFF ON: Parking brake switch on OFF: Parking brake switch off OK Normal conditions listed above are displayed. NG --> See step 2 OK --> See step 5
2. INSPECT PARKING BRAKE SWITCH ASSEMBLY Remove the parking brake switch assembly. Refer to «COMPONENTS». Measure the resistance according to the value(s) in the table below. Standard Resistance Tester Connection Condition Specified Condition 1 - Switch body Shaft pushed in (OFF) 10 kohms or higher 1 - Switch body Shaft not pushed in (ON) Below 1 ohms NG --> See step 6 OK: Go to next step
3. CHECK HARNESS AND CONNECTOR (SWITCH - INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY) Disconnect the 2F instrument panel junction block assembly connector. Disconnect the A49 parking brake switch assembly connector. Measure the resistance according to the value(s) in the table below. Standard Resistance Tester Connection Condition Specified Condition A49-1 - 2F-32 Always Below 1 ohms A49-1 - Body ground Always 10 kohms or higher TEXT IN ILLUSTRATION *1 Front view of wire harness connector (to Instrument Panel Junction Block Assembly) *2 Front view of wire harness connector (to Parking Brake Switch Assembly) NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR OK: Go to next step
4. INSPECT INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY Remove the instrument panel junction block assembly. Measure the resistance according to the value(s) in the table below. Standard Resistance Tester Connection Condition Specified Condition 2F-32 - A-12 (PKB) Always Below 1 ohms 2F-32 - Body ground Always 10 kohms or higher TEXT IN ILLUSTRATION *1 Component without harness connected (Instrument Panel Junction Block Assembly) NG --> REPLACE INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY OK --> See step 7
5. PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE. Refer to «PROBLEM SYMPTOMS TABLE»
6. REPLACE PARKING BRAKE SWITCH ASSEMBLY. Refer to «COMPONENTS»
7. REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU). Refer to «COMPONENTS»

The main body ECU (multiplex network body ECU) detects the condition of the parking brake switch.

The main body ECU (multiplex network body ECU) controls the operation of the TAIL relay.

Scheme 204

The main body ECU (multiplex network body ECU) controls the operation of the TAIL relay.

This circuit detects the state of the engine switch, and sends it to the inner rear view mirror assembly.

Scheme 205

This circuit detects the state of the engine switch, and sends it to the inner rear view mirror assembly.

1. By connecting terminals LVL and CG of the DLC3, the zero point of the height control sensor is set in the AFS ECU (headlight swivel ECU assembly).

Scheme 206

Scheme 207

Scheme 208

1. CHECK HARNESS AND CONNECTOR (DLC3 - AFS ECU) Disconnect the A53 AFS ECU (headlight swivel ECU assembly) connector. Measure the resistance according to the value(s) in the table below. Standard Resistance Tester Connection Condition Specified Condition A53-7 (INIT) - F17-8 (LVL) Always Below 1 ohms A53-7 (INIT) - Body ground Always 10 kohms or higher TEXT IN ILLUSTRATION *1 Front view of wire harness connector (to AFS ECU (Headlight Swivel ECU Assembly)) *2 DLC3 NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR OK: Go to next step
2. CHECK HARNESS AND CONNECTOR (DLC3 - BODY GROUND) Measure the resistance according to the value(s) in the table below. Standard Resistance Tester Connection Condition Specified Condition F17-4 (CG) - Body ground Always Below 1 ohms TEXT IN ILLUSTRATION *1 DLC3 NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR OK --> See step 3
3. PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE. Refer to «PROBLEM SYMPTOMS TABLE»

1. By connecting terminals LVL and CG of the DLC3, the zero point of the height control sensor is set in the AFS ECU (headlight swivel ECU assembly).

The main body ECU (multiplex network body ECU) controls the headlight relays.

Scheme 209

Scheme 210

The main body ECU (multiplex network body ECU) controls the headlight relays.

The main body ECU (multiplex network body ECU) controls the high beam headlights.

Scheme 211

The main body ECU (multiplex network body ECU) controls the high beam headlights.

See also:
• COMPONENTS