Lighting: Overview Lexus ES XV40

DESCRIPTION

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

DTC TROUBLE DETECTION CONDITION

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1. READ VALUE OF INTELLIGENT TESTER Connect the intelligent tester to the DLC3. Turn the engine switch on (IG) and turn the intelligent tester main switch on. Select the item below in the DATA LIST, and read the display on the intelligent tester. MAIN BODY (MAIN BODY ECU): DATA LIST Tester Display Measurement Item/Range Normal Condition Diagnostic Note ILLUMINATE RATE Illumination rate information / 0 ms to 99.99 ms 0.8 ms to 22.0 ms (Value is output according to ambient light levels) - OK: Normal condition listed above is displayed. NG: Go to step 2 OK: REPLACE INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY
2. CHECK HARNESS AND CONNECTOR (MAIN BODY ECU-AUTOMATIC LIGHT CONTROL SENSOR) Disconnect the G3 automatic light control sensor connector. Disconnect the E60 main body ECU connector. Measure the resistance according to the value(s) in the table below. Standard resistance TESTER CONNECTION SPECIFIED CONDITION Tester Connection Condition Specified Condition E60-18 (CLTE) - G3-3 (CLTE) Always Below 1 ohms E60-19 (CLTS) - G3-5 (CLTS) Always Below 1 ohms E60-20 (CLTB) - G3-6 (CLTB) Always Below 1 ohms E60-18 (CLTE) - Body ground Always 10 kohms or higher E60-19 (CLTS) - Body ground Always 10 kohms or higher E60-20 (CLTB) - Body ground Always 10 kohms or higher NG: REPAIR OR REPLACE HARNESS OR CONNECTOR OK: Go to next step.
3. INSPECT MAIN BODY ECU (INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY) Reconnect the main body ECU connector. Measure the voltage and resistance according to the value(s) in the table below. Standard voltage TESTER CONNECTION SPECIFIED CONDITION Tester Connection Condition Specified Condition G3-6 (CLTB) - G3-3 (CLTE) Engine switch off Below 1 V G3-6 (CLTB) - G3-3 (CLTE) Engine switch on (IG) 10 to 14 V Standard resistance TESTER CONNECTION SPECIFIED CONDITION Tester Connection Condition Specified Condition G3-3 (CLTE) - Body ground Always Below 1 ohms NG: REPLACE INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY OK: Go to next step.
4. INSPECT AUTOMATIC LIGHT CONTROL SENSOR Reconnect the automatic light control sensor connector. Connect an oscilloscope to the automatic light control sensor connector. Check the waveform. OK TESTER CONNECTION SPECIFIED CONDITION Tester Connection Tool Setting Condition Specified Condition G3-3 (CLTE) - G3-5 (CLTS) 5 V/DIV., 5 ms./DIV. Engine switch on (IG), light control switch in AUTO Correct waveform is as shown HINT: If the ambient light becomes brighter, width A becomes narrower. NG: REPLACE AUTOMATIC LIGHT CONTROL SENSOR OK: REPLACE INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY

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

DTC TROUBLE DETECTION CONDITION

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1. CHECK HARNESS AND CONNECTOR Disconnect the A22 AFS ECU connector. Disconnect the A15 or A18 headlight assembly connector. Measure the resistance according to the value(s) in the table below. Standard resistance: LH Side (B2410) TESTER CONNECTION SPECIFIED CONDITION Tester Connection Condition Specified Condition A22-1 (SMBL) - A15-1 (SMBL) Always Below 1 ohms A22-23 (SMGL) - A15-3 (SMGL) Always Below 1 ohms A22-29 (SML) - A15-2 (SML) Always Below 1 ohms A22-1 (SMBL) - Body ground Always 10 kohms or higher A22-23 (SMGL) - Body ground Always 10 kohms or higher A22-29 (SML) - Body ground Always 10 kohms or higher RH Side (B2411) TESTER CONNECTION SPECIFIED CONDITION Tester Connection Condition Specified Condition A22-2 (SMBR) - A18-1 (SMBR) Always Below 1 ohms A22-10 (SMR) - A18-2 (SMR) Always Below 1 ohms A22-24 (SMGR) - A18-3 (SMGR) Always Below 1 ohms A22-2 (SMBR) - Body ground Always 10 kohms or higher A22-10 (SMR) - Body ground Always 10 kohms or higher A22-24 (SMGR) - Body ground Always 10 kohms or higher NG: REPAIR OR REPLACE HARNESS OR CONNECTOR OK: Go to next step.
2. REPLACE HEADLIGHT REFLECTOR (HEADLIGHT SWIVEL MOTOR) OK: Returns to normal operation. NG: REPLACE AFS ECU OK: END

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 TROUBLE DETECTION CONDITION

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1. PERFORM ACTIVE TEST USING INTELLIGENT TESTER Connect the intelligent tester to the DLC3. Turn the engine switch on (IG) and turn the intelligent tester main switch on. Select the items below in the ACTIVE TEST and then check that the motor operates. AFS (AFS ECU): DATA LIST Tester Display Test Part Control Range Diagnostic Note SWIVEL MTR (RH) Swivel motor RH RIGHT / OFF - LEFT/OFF - SWIVEL MTR (LH) Swivel motor LH RIGHT/OFF - LEFT/OFF - OK: Swivel motors operate normally. NG: Go to step 2 OK: REPLACE AFS ECU
2. CHECK HARNESS AND CONNECTOR (POWER SOURCE CIRCUIT) HINT: (See «AFS ECU Power Source Circuit»(ref-283105-S21710675752008041700000) ) NG: REPAIR OR REPLACE HARNESS OR CONNECTOR OK: Go to next step.
3. CHECK HARNESS AND CONNECTOR (AFS ECU - HEADLIGHT ASSEMBLY) Disconnect the A22 AFS ECU connector. Disconnect the A15 or A18 headlight assembly connector. Measure the resistance according to the value(s) in the table below. Standard resistance: LH Side (B2412) TESTER CONNECTION SPECIFIED CONDITION Tester Connection Condition Specified Condition A22-1 (SMBL) - A15-1 (SMBL) Always Below 1 ohms A22-23 (SMGL) - A15-3 (SMGL) Always Below 1 ohms A22-29 (SML) - A15-2 (SML) Always Below 1 ohms A22-1 (SMBL) - Body ground Always 10 kohms or higher A22-23 (SMGL) - Body ground Always 10 kohms or higher A22-29 (SML) - Body ground Always 10 kohms or higher RH Side (B2413) TESTER CONNECTION SPECIFIED CONDITION Tester Connection Condition Specified Condition A22-2 (SMBR) - A18-1 (SMBR) Always Below 1 ohms A22-10 (SMR) - A18-2 (SMR) Always Below 1 ohms A22-24 (SMGR) - A18-3 (SMGR) Always Below 1 ohms A22-2 (SMBR) - Body ground Always 10 kohms or higher A22-10 (SMR) - Body ground Always 10 kohms or higher A22-24 (SMGR) - Body ground Always 10 kohms or higher NG: REPAIR OR REPLACE HARNESS OR CONNECTOR OK: Go to next step.
4. INSPECT AFS ECU Reconnect the A22 AFS ECU connector. Measure the voltage according to the value(s) in the table below. Standard voltage: LH Side (B2412) TESTER CONNECTION SPECIFIED CONDITION Tester Connection Condition Specified Condition A22-1 (SMBL) - A22-23 (SMGL) Engine switch off Below 1 V Engine switch on (IG) 10 to 14 V RH Side (B2413) TESTER CONNECTION SPECIFIED CONDITION Tester Connection Condition Specified Condition A22-2 (SMBR) - A22-24 (SMGR) Engine switch off Below 1 V Engine switch on (IG) 10 to 14 V NG: REPLACE AFS ECU OK: Go to next step.
5. REPLACE HEADLIGHT REFLECTOR (HEADLIGHT SWIVEL MOTOR) OK: Returns to normal operation. NG: REPLACE AFS ECU OK: END

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

DTC TROUBLE DETECTION CONDITION

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

DTC TROUBLE DETECTION CONDITION

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

DTC TROUBLE DETECTION CONDITION

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1. READ VALUE OF INTELLIGENT TESTER Connect the intelligent tester to the DLC3. Turn the engine switch on (IG) and turn the intelligent tester main switch on. Select the items below in the DATA LIST, and read the display on the intelligent tester. AFS (AFS ECU): DATA LIST Tester Display Measurement Item/Range Normal Condition Diagnostic Note RR HEIGHT SENS SENS Rear height control sensor signal value / 0 to 5 V Approx. 2.5 V - HEIGHT SENSE VAL Rear height control sensor power supply value / 0 to 5 V Approx. 5.0 V - OK: Normal conditions listed above are displayed. NG: Go to step 2 OK: REPLACE AFS ECU
2. CHECK HARNESS AND CONNECTOR (AFS ECU - REAR HEIGHT CONTROL SENSOR SUB-ASSEMBLY) Disconnect the A22 AFS ECU connector. Disconnect the O1 rear height control sensor sub-assembly connector. Measure the resistance according to the value(s) in the table below. Standard resistance TESTER CONNECTION SPECIFIED CONDITION Tester Connection Condition Specified Condition A22-18 (SBR) - O1-3 (SHB) Always Below 1 ohms A22-19 (SHRL) - O1-2 (SHRR) Always Below 1 ohms A22-21 (SGR) - O1-1 (SHG) Always Below 1 ohms A22-18 (SBR) - Body ground Always 10 kohms or higher A22-19 (SHRL) - Body ground Always 10 kohms or higher A22-21 (SGR) - Body ground Always 10 kohms or higher NG: REPAIR OR REPLACE HARNESS OR CONNECTOR OK: Go to next step.
3. INSPECT AFS ECU Reconnect the A22 AFS ECU connector. Measure the voltage according to the value(s) in the table below. Standard voltage TESTER CONNECTION SPECIFIED CONDITION Tester Condition Condition Specified Condition SBR (A22-18) - SGR (A22-21) Engine switch on (IG) 4.5 to 5.5 V NG: REPLACE AFS ECU OK: Go to next step.
4. INSPECT REAR HEIGHT CONTROL SENSOR SUB-ASSEMBLY Connect 3 dry cell batteries (1.5 V) in series. Remove the rear height control sensor sub-assembly. Connect the positive (+) lead from the battery to terminal 3, and the negative (-) lead from the battery to terminal 1. Measure the voltage between terminals 2 and 1 while slowly moving the link up and down. Standard voltage TESTER CONNECTION SPECIFIED CONDITION Tester Condition Condition Specified Condition 2 (SHRR) - 1 (SHG) +45° (High) Approx. 4.05 V 0° (Normal) Approx. 2.25 V -45° (Low) Approx. 0.45 V NG: REPLACE REAR HEIGHT CONTROL SENSOR SUB-ASSEMBLY OK: REPLACE AFS ECU

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 TROUBLE DETECTION CONDITION

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1. PERFORM ACTIVE TEST USING INTELLIGENT TESTER Connect the intelligent tester to the DLC3. Turn the engine switch on (IG) and turn the intelligent tester main switch on. Select the items below in the ACTIVE TEST and then check that the motor operates. AFS (AFS ECU): DATA LIST Tester Display Test Part Control Range Diagnostic Note LEVELING MTR Leveling motor UP/OFF - DOWN / OFF - OK: Headlight leveling motors operate normally. NG: Go to step 2 OK: REPLACE AFS ECU
2. CHECK HARNESS AND CONNECTOR (POWER SOURCE CIRCUIT) HINT: (See «AFS ECU Power Source Circuit»(ref-283105-S21710675752008041700000) ) NG: REPAIR OR REPLACE HARNESS OR CONNECTOR OK: Go to next step.
3. CHECK HARNESS AND CONNECTOR (AFS ECU - HEADLIGHT LEVELING MOTOR) Disconnect the A22 AFS ECU connector. Disconnect the A20 or A21 headlight leveling motor connector. Measure the resistance according to the value(s) in the table below. Standard resistance: LH Side (B2412) TESTER CONNECTION SPECIFIED CONDITION Tester Connection Condition Specified Condition A22-3 (LHT) - A20-1 (LHB1) Always Below 1 ohms A22-27 (LH-) - A20-3 (LHE) Always Below 1 ohms A22-30 (LH+) - A20-2 (LHM+) Always Below 1 ohms A22-3 (LHT) - Body ground Always 10 kohms or higher A22-27 (LH-) - Body ground Always 10 kohms or higher A22-30 (LH+) - Body ground Always 10 kohms or higher RH Side (B2413) TESTER CONNECTION SPECIFIED CONDITION Tester Connection Condition Specified Condition A22-4 (RHT) - A21-1 (RHB1) Always Below 1 ohms A22-28 (RH-) - A21-3 (RHE) Always Below 1 ohms A22-11 (RH+) - A21-2 (RHM+) Always Below 1 ohms A22-4 (RHT) - Body ground Always 10 kohms or higher A22-28 (RH-) - Body ground Always 10 kohms or higher A22-11 (RH+) - Body ground Always 10 kohms or higher NG: REPAIR OR REPLACE HARNESS OR CONNECTOR OK: Go to next step.
4. REPLACE HEADLIGHT UNIT (HEADLIGHT LEVELING MOTOR) OK: Returns to normal operation. NG: REPLACE AFS ECU OK: END

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

DTC TROUBLE DETECTION CONDITION

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

DTC TROUBLE DETECTION CONDITION

1. The AFS ECU receives an engine running status signal and shift position signal from the ECM using CAN communication.
2. The AFS ECU receives front LH and RH speed sensor signals from the skid control ECU using CAN communication.
3. The AFS ECU receives the headlight status 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 TROUBLE DETECTION CONDITION

The main body ECU receives a signal from the light control switch, and turns on the low beam headlights.

HINT

1. The headlight relays are installed in the power distributor, so unlike conventional relays, it cannot be removed for inspection.
2. If only a low beam headlight bulb on one side does not illuminate, inspect the bulb, fuse, or wire harness that is related to the bulb.
3. If both right and left low beam headlights do not illuminate when the light control switch is turned to the HEAD position, read the light control switch HEAD signal value in the data list and perform the headlight relay active test to determine if the malfunction exists on either the switch side or the relay side.

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1. PERFORM ACTIVE TEST USING INTELLIGENT TESTER Connect the intelligent tester to the DLC3. Turn the engine switch on (IG) and turn the intelligent tester main switch on. Select the item below in the ACTIVE TEST and then check that the relay operates. MAIN BODY (MAIN BODY ECU): DATA LIST Tester Display Test Part Control Range Diagnostic Note HEAD LIGHT Headlight relay ON / OFF - OK: Headlight relays operate. (Low beam headlights illuminate.) OK: PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE NG: Go to next step.
2. INSPECT ENGINE ROOM JUNCTION BLOCK ASSEMBLY Remove the H-LP (RL) fuse and H-LP (LL) fuse from the engine room junction block assembly. Measure the voltage between the loading slot of each fuse and body ground. Standard voltage TESTER CONNECTION SPECIFIED CONDITION Tester Connection Condition Specified Condition H-LP (RL) Terminal - Body ground Light control switch in HEAD 10 to 14 V H-LP (LL) Terminal - Body ground Light control switch in HEAD 10 to 14 V OK: REPAIR OR REPLACE HARNESS OR CONNECTOR (FUSE - BODY GROUND) NG: Go to next step.
3. INSPECT INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY Measure the voltage according to the value(s) in the table below. Standard voltage TESTER CONNECTION SPECIFIED CONDITION Tester Connection Condition Specified Condition DD-3 (HRLY) - Body ground Light control switch OFF --> HEAD 10 to 14 V --> Below 1 V OK: REPLACE ENGINE ROOM JUNCTION BLOCK ASSEMBLY NG: Go to next step.
4. INSPECT INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY Disconnect the DD instrument panel junction block assembly connector. Measure the voltage according to the value(s) in the table below. Standard voltage TESTER CONNECTION SPECIFIED CONDITION Tester Connection Condition Specified Condition DD-3 (HRLY) - Body ground Always 10 to 14 V OK: REPLACE INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY NG: Go to next step.
5. INSPECT ENGINE ROOM JUNCTION BLOCK LOCK ASSEMBLY Disconnect the 1D engine room J/B assembly connector. Measure the voltage according to the value(s) in the table below. Standard voltage TESTER CONNECTION SPECIFIED CONDITION Tester Connection Condition Specified Condition 1D-9 - Body ground Always 10 to 14 V OK: REPAIR OR REPLACE HARNESS OR CONNECTOR (ENGINE ROOM J/B ASSEMBLY - INSTRUMENT PANEL J/B ASSEMBLY) NG: Go to next step.
6. CHECK HARNESS AND CONNECTOR (BATTERY - ENGINE ROOM J/B ASSEMBLY) Disconnect the 1G engine room junction block assembly connector. Measure the voltage according to the value(s) in the table below. Standard voltage TESTER CONNECTION SPECIFIED CONDITION Tester Connector Condition Specified Condition 1G-1 - Body ground Always 10 to 14 V NG: REPAIR OR REPLACE HARNESS OR CONNECTOR OK: REPLACE ENGINE ROOM JUNCTION BLOCK ASSEMBLY

When either of the following conditions is met, the high beam headlights come on.

1. Dimmer switch in HIGH position and light control switch in HEAD position.
2. Dimmer switch in HIGH position, light control switch in AUTO position, and low beam headlights are on.

HINT

1. The power distributor has a fail-safe function control. If a short circuit occurs between the power distributor and high beam headlight bulb, the power distributor stops the DRL relay operation.
2. The DRL relay is built into the power distributor, so unlike conventional relays, it cannot be removed for inspection.
3. If only a high beam headlight on one side does not illuminate, inspect the fuse, bulb, or wire harness that is related to the bulb.
4. If both right and left high beam headlights do not illuminate, read the dimmer switch HIGH signal value in the data list, and perform the DRL relay active test to determine if the malfunction exists on either the switch side or the relay side.

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1. PERFORM ACTIVE TEST USING INTELLIGENT TESTER Connect the intelligent tester to the DLC3. Turn the engine switch on (IG) and turn the intelligent tester main switch on. Select the item below in the ACTIVE TEST and then check that the relay operates. MAIN BODY (MAIN BODY ECU): DATA LIST Tester Display Test Part Control Range Diagnostic Note HEAD LIGHT (HI) DRL relay ON/OFF - OK: Relay operates. (High beam headlights illuminate.) OK: PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE NG: Go to next step.
2. CHECK HARNESS AND CONNECTOR (SHORT IN RELAY-DRIVEN CIRCUIT) Remove the H-LP (RH) fuse from the engine room junction block assembly. Turn the light control switch to the HEAD position and turn the dimmer switch to the HIGH position. Check if the high beam headlight LH illuminates. Turn the dimmer switch to the LOW position. Install the H-LP (RH) fuse and remove the H-LP (LH) fuse. Turn the dimmer switch to the HIGH position. Check if the high beam headlight RH illuminates. OK: Either high beam headlight LH or RH illuminates. OK: REPAIR OR REPLACE HARNESS OR CONNECTOR (SHORT CIRCUIT BETWEEN FUSE AND BULB) NG: Go to next step.
3. INSPECT ENGINE ROOM JUNCTION BLOCK ASSEMBLY Remove the H-LP (RH) fuse and H-LP (LH) fuse from the engine room junction block assembly. Measure the voltage between the loading slot of each fuse and body ground. Standard voltage TESTER CONNECTION SPECIFIED CONDITION Tester Connection Condition Specified Condition H-LP (RH) terminal - Body ground Light control switch in HEAD and dimmer switch in HIGH 10 to 14 V H-LP (LH) terminal - Body ground Light control switch in HEAD and dimmer switch in HIGH 10 to 14 V OK: REPAIR OR REPLACE HARNESS OR CONNECTOR (OPEN CIRCUIT BETWEEN FUSE AND BODY GROUND) NG: Go to next step.
4. INSPECT INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY Measure the voltage according to the value(s) in the table below. Standard voltage TESTER CONNECTION SPECIFIED CONDITION Tester Connection Condition Specified Condition DD-3 (HRLY) - Body ground Light control switch OFF --> HEAD 10 to 14 V --> Below 1 V DD-9 (DRL) - Body ground Light control switch in HEAD, dimmer switch LOW --> HIGH 10 to 14 V --> Below 1 V OK: REPLACE ENGINE ROOM JUNCTION BLOCK ASSEMBLY NG: Go to next step.
5. INSPECT INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY Disconnect the DD instrument panel junction block connector. Measure the voltage according to the value(s) in the table below. Standard voltage TESTER CONNECTION SPECIFIED CONDITION Tester Connection Condition Specified Condition DD-3 (HRLY) - Body ground Always 10 to 14 V DD-9 (DRL) - Body ground Always 10 to 14 V OK: REPLACE INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY NG: Go to next step.
6. INSPECT ENGINE ROOM JUNCTION BLOCK ASSEMBLY Disconnect the 1D engine room junction block assembly connector. Measure the voltage according to the value(s) in the table below. Standard voltage TESTER CONNECTION SPECIFIED CONDITION Tester Connection Condition Specified Condition 1D-8 - Body ground Always 10 to 14 V 1D-9 - Body ground Always 10 to 14 V OK: REPAIR OR REPLACE HARNESS OR CONNECTOR (ENGINE ROOM J/B ASSEMBLY - INSTRUMENT PANEL J/B ASSEMBLY) NG: Go to next step.
7. CHECK HARNESS AND CONNECTOR (ENGINE ROOM J/B ASSEMBLY - BATTERY AND BODY GROUND) Disconnect the 1G engine room junction block assembly connector. Measure the voltage according to the value(s) in the table below. Standard voltage TESTER CONNECTION SPECIFIED CONDITION Tester Connection Condition Specified Condition 1G-1 - Body ground Always 10 to 14 V Disconnect the 1E engine room J/B assembly connector. Measure the resistance according to the value(s) in the table below. Standard resistance TESTER CONNECTION SPECIFIED CONDITION Tester Connection Condition Specified Condition 1E-11 - Body ground Always Below 1 ohms OK: REPLACE ENGINE ROOM JUNCTION BLOCK ASSEMBLY NG: REPAIR OR REPLACE HARNESS OR CONNECTOR

When all of the following conditions are met, the front fog lights come on.

1. Low beam headlights are ON.
2. Front fog light switch is ON.
3. High beam headlights are OFF.

When any of the following conditions is met, the front fog lights turn off.

1. Front fog light switch is OFF.
2. Low beam headlights are OFF.
3. High beam headlights are ON.

HINT

1. Before performing troubleshooting of the front fog light system, check that the taillight system and headlight system are normal.
2. If only a front fog light on one side does not illuminate, inspect the bulb or wire harness that is related to the bulb.
3. If both right and left front fog lights do not illuminate, read the front fog light switch value in the data list and perform the front fog light relay active test to determine if the malfunction exists on either the switch side or the relay side.

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1. PERFORM ACTIVE TEST USING INTELLIGENT TESTER Connect the intelligent tester to the DLC3. Turn the engine switch on (IG) and turn the intelligent tester main switch on. Select the item below in the ACTIVE TEST and then check that the relay operates. MAIN BODY (MAIN BODY ECU): DATA LIST Tester Display Test Part Control Range Diagnostic Note F FOG LIGHT RLY Front fog light relay (Taillights are ON) ON / OFF - OK: Front fog light relay operates. (Front fog lights come on.) OK: PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE NG: Go to next step.
2. INSPECT FUSE (FR FOG) Remove the FR FOG fuse from the instrument panel J/B assembly. Measure the resistance of the fuse. Standard resistance: Below 1 ohms NG: REPLACE FUSE OK: Go to next step.
3. INSPECT FOG LIGHT RELAY Remove the front fog light relay from the instrument panel junction block assembly. Measure the resistance according to the value(s) in the table below. Standard resistance TESTER CONNECTION SPECIFIED CONDITION Tester Connection Specified Condition 3 - 5 10 kohms or higher Below 1 ohms (When battery voltage is applied to terminals 1 and 2) NG: REPLACE FOG LIGHT RELAY OK: Go to next step.
4. INSPECT INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY Measure the voltage according to the value(s) in the table below. Standard voltage TESTER CONNECTION SPECIFIED CONDITION Tester Connection Condition Specified Condition DC-1 - Body ground Light control switch in HEAD, front fog light switch OFF --> ON Below 1 V --> 10 to 14 V DD-5 - Body ground Light control switch in HEAD, front fog light switch OFF --> ON Below 1 V --> 10 to 14 V OK: REPAIR OR REPLACE HARNESS OR CONNECTOR (INSTRUMENT PANEL J/B ASSEMBLY - BODY GROUND) NG: Go to next step.
5. INSPECT INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY Measure the voltage according to the value(s) in the table below. Standard voltage TESTER CONNECTION SPECIFIED CONDITION Tester Connection Condition Specified Condition DL-3 - Body ground Light control switch OFF --> TAIL Below 1 V --> 10 to 14 V NG: REPLACE INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY OK: Go to next step.
6. CHECK HARNESS AND CONNECTOR (BETWEEN CONNECTOR DL-3 AND CONNECTOR DL-4) Measure the voltage according to the value(s) in the table below. Standard voltage TESTER CONNECTION SPECIFIED CONDITION Tester Connection Condition Specified Condition DL-4 - Body ground Light control switch OFF --> TAIL Below 1 V --> 10 to 14 V NG: REPAIR OR REPLACE HARNESS OR CONNECTOR OK: Go to next step.
7. INSPECT INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY Disconnect the Dl instrument panel assembly connector. Measure the voltage according to the value(s) in the table below. Standard voltage TESTER CONNECTION SPECIFIED CONDITION Tester Connection Condition Specified Condition DI-8 - Body ground Light control switch OFF --> TAIL Below 1 V --> 10 to 14 V NG: REPLACE INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY OK: Go to next step.
8. CHECK HARNESS AND CONNECTOR (BODY ECU - INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY) Disconnect the E61 main body ECU connector. Measure the resistance according to the value(s) in the table below. Standard resistance TESTER CONNECTION SPECIFIED CONDITION Tester Connection Condition Specified Condition E61-4 - DI-8 Always Below 1 ohms NG: REPAIR OR REPLACE HARNESS OR CONNECTOR OK: REPLACE INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY

The main body ECU receives the following signals

1. Light control switch TAIL, HEAD, or AUTO signal.
2. Dimmer switch HIGH or HIGH FLASH (PASS) signal.
3. Front fog light switch signal.
4. Rear fog light switch signal.

HINT

1. When performing troubleshooting, inspect the switch that is related to the malfunction. For example, if both right and left low beam headlights do not illuminate, read the light control switch HEAD signal value only in the data list. If the value is normal, perform the headlight relay active test.

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1. READ VALUE OF INTELLIGENT TESTER Connect the intelligent tester to the DLC3. Turn the engine switch on (IG) and turn the intelligent tester main switch on. Select the items below in the DATA LIST, and read the display on the intelligent tester. MAIN BODY (MAIN BODY ECU): DATA LIST Tester Display Measurement Item/Range Normal Condition Diagnostic Note DIMMER SW Dimmer switch HIGH signal / ON or OFF ON: Dimmer switch in HIGH or HIGH FLASH OFF: Dimmer switch in LOW - HIGH FLASHER SW Dimmer switch HIGH FLASH signal / ON or OFF ON: Dimmer switch in HIGH FLASH OFF: Dimmer switch not in HIGH FLASH - F FOG LIGHT SW Fog light switch signal / ON or OFF ON: Fog light switch ON OFF: Fog light switch OFF - AUTO LIGHT SW Light control switch AUTO signal / ON or OFF ON: Light control switch in AUTO OFF: Light control switch not in AUTO - HEAD LIGHT SW Light control switch HEAD signal / ON or OFF ON: Light control switch in HEAD OFF: Light control switch not in HEAD - TAIL LIGHT SW Light control switch TAIL signal / ON or OFF ON: Light control switch in TAIL or HEAD OFF: Light control switch in neither TAIL nor HEAD - OK: Normal conditions listed above are displayed. OK: PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE NG: Go to next step.
2. INSPECT HEADLIGHT DIMMER SWITCH ASSEMBLY HINT: (See «INSPECTION»(ref-283105-S27975392132008041700000) ) OK: Headlight dimmer switch assembly is normal. NG: REPLACE HEADLIGHT DIMMER SWITCH ASSEMBLY OK: Go to next step.
3. CHECK HARNESS AND CONNECTOR (INSTRUMENT PANEL J/B ASSEMBLY - SWITCH ASSEMBLY) Disconnect the E27 headlight dimmer switch assembly connector. Disconnect the E60 and E61 main body ECU connectors. Disconnect the DG instrument panel J/B connector. Measure the resistance according to the value(s) in the table below. Standard resistance TESTER CONNECTION SPECIFIED CONDITION Tester Connection Condition Specified Condition E27-4 (BFG) - E60-28 (FFOG) Always Below 1 ohms E27-11 (HU) - DG-5 (HU) Always Below 1 ohms E27-17 (HF) - E61-13 (HF) Always Below 1 ohms E27-18 (T) - E61-23 (TAIL) Always Below 1 ohms E27-19 (A) - E61-21 (A) Always Below 1 ohms E27-20 (H) - E60-17 (HEAD) Always Below 1 ohms E27-3 (LFG) - Body ground Always 10 kohms or higher E27-4 (BFG) - Body ground Always 10 kohms or higher E27-11 (HU) - Body ground Always 10 kohms or higher E27-17 (HF) - Body ground Always 10 kohms or higher E27-18 (T) - Body ground Always 10 kohms or higher E27-19 (A) - Body ground Always 10 kohms or higher E27-20 (H) - Body ground Always 10 kohms or higher E27-12 (EL) - Body ground Always Below 1 ohms NG: REPAIR OR REPLACE HARNESS OR CONNECTOR OK: REPLACE INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY

The main body ECU detects the condition of the door courtesy switches.

HINT

1. The main body ECU receives driver side, passenger side, rear LH, and rear RH door courtesy switch signals to control the illuminated entry system.
2. The main body ECU receives driver side, passenger side, rear LH, rear RH, and luggage compartment door courtesy switch signals to control the light auto turn off system.
3. When performing troubleshooting, inspect the switch that is related to the malfunction only. For example, if the illuminated entry system does not operate when opening the passenger side door with the engine switch off, inspect the passenger side door courtesy switch circuit only.

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1. READ VALUE OF INTELLIGENT TESTER Connect the intelligent tester to the DLC3. Turn the engine switch on (IG) and turn the intelligent tester main switch on. Select the items below in the DATA LIST, and read the display on the intelligent tester. MAIN BODY (MAIN BODY ECU): DATA LIST Tester Display Measurement Item/Range Normal Condition Diagnostic Note D DOR CTY SW Driver side door courtesy switch signal / ON or OFF ON: Driver side door is open OFF: Driver side door is closed - P DOR CTY SW Passenger side door courtesy switch signal / ON or OFF ON: Passenger side door is open OFF: Passenger side door is closed - RR DOR CTY SW Rear right door courtesy switch signal / ON or OFF ON: Rear right door is open OFF: Rear right door is closed - RL DOR CTY SW Rear left door courtesy switch signal / ON or OFF ON: Rear left door is open OFF: Rear left door is closed - LUGG COURTSY SW Luggage compartment door courtesy switch signal / ON or OFF ON: Luggage compartment door is open OFF: Luggage compartment door is closed - OK: Normal conditions listed above are displayed. OK: PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE NG: Go to next step.
2. INSPECT DOOR COURTESY SWITCH Inspect the front door courtesy switch (See «INSPECTION»(ref-283105-S23518785702008041700000) ). Inspect the rear door courtesy switch (See «INSPECTION»(ref-283105-S17381295292008041700000) ). Inspect the luggage compartment door courtesy switch (See «INSPECTION»(ref-283105-S38842536182008041700000) ). OK: Door courtesy switches are normal. NG: REPLACE DOOR COURTESY SWITCH OK: Go to next step.
3. CHECK HARNESS AND CONNECTOR (MAIN BODY ECU - DOOR COURTESY SWITCH) Check the harness and connector between the main body ECU and door courtesy switches (passenger side and rear RH). Disconnect the E60 main body ECU connector. Disconnect the M6 and M7 switch connectors. Measure the resistance according to the value(s) in the table below. Standard resistance TESTER CONNECTION SPECIFIED CONDITION Tester Connection Condition Specified Condition E60-7 (RCTY) - M7-1 (Rear RH) Always Below 1 ohms E60-21 (PCTY) - M6-1 (Front passenger side) Always Below 1 ohms E60-7 (RCTY) - Body ground Always 10 kohms or higher E60-21 (PCTY) - Body ground Always 10 kohms or higher Check the harness and connector between the instrument panel junction block assembly and rear LH door courtesy switch. Disconnect the DO instrument panel J/B assembly connector. Disconnect the L8 switch connector. Measure the resistance according to the value(s) in the table below. Standard resistance TESTER CONNECTION SPECIFIED CONDITION Tester Connection Condition Specified Condition DO-7 (LCTY) - L8-1 (Rear LH) Always Below 1 ohms DO-7 (LCTY) - Body ground Always 10 kohms or higher Check the harness and connector between the main body ECU and driver side door courtesy switch. Disconnect the E61 main body ECU connector. Disconnect the L7 switch connector. Measure the resistance according to the value(s) in the table below. Standard resistance TESTER CONNECTION SPECIFIED CONDITION Tester Connection Condition Specified Condition E61-24 (DCTY) - L7-1 (Driver side) Always Below 1 ohms E61-24 (DCTY) - Body ground Always 10 kohms or higher Check the harness and connector between the main body ECU and luggage compartment door courtesy switch. Disconnect the E60 main body ECU connector. Disconnect the R1 switch connector. Measure the resistance according to the value(s) in the table below. Standard resistance TESTER CONNECTION SPECIFIED CONDITION Tester Connection Condition Specified Condition E60-25 (LGCY) - R1-3 (Luggage door) Always Below 1 ohms E60-25 (LGCY) - Body ground Always 10 kohms or higher NG: REPAIR OR REPLACE HARNESS OR CONNECTOR OK: REPLACE INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY

The main body ECU receives driver side, passenger side, rear LH side, and rear RH side door lock position switch signals to control the illuminated entry system and light auto turn off system.

Scheme 42

The interior light control of the illuminated entry system is controlled by the main body ECU. The operation and condition of this control are described below.

OPERATION CONDITION

HINT

When any of the lights do not illuminate, perform the inspection according to the PROBLEM SYMPTOMS TABLE. When all of the lights (interior light, front seat illumination, rear seat illumination, and rear door courtesy lights) do not illuminate, perform the ACTIVE TEST of the illuminated entry system. If it is normal, there may be a malfunction in the door courtesy switch circuit, door lock position switch circuit, or engine switch circuit.

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1. PERFORM ACTIVE TEST USING INTELLIGENT TESTER Connect the intelligent tester to the DLC3. Turn the engine switch on (IG) and turn the intelligent tester main switch on. Select the item(s) below in the ACTIVE TEST, and check the operation. MAIN BODY (MAIN BODY ECU): DATA LIST Tester Display Test Part Control Range Diagnostic Note ILLUMI OUTPUT Interior light, front seat illumination, rear seat illumination and rear door courtesy lights (Front personal switches are OFF, DOOR switch is ON, seat illumination switch is OFF, and all doors are closed) ON / OFF - OK: Each light illuminates. OK: PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE NG: Go to next step.
2. CHECK HARNESS AND CONNECTOR (BATTERY - INSTRUMENT PANEL J/B AND BATTERY) Disconnect the DR instrument panel J/B connector. Measure the voltage according to the value(s) in the table below. Standard voltage TESTER CONNECTION SPECIFIED CONDITION Tester Connection Condition Specified Condition DR-5 (ILL) - Body ground Always 10 to 14 V NG: REPAIR OR REPLACE HARNESS OR CONNECTOR OK: REPLACE INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY

The footwell illumination control is controlled by the main body ECU. The operation and condition of this control are described below.

OPERATION CONDITION

HINT

1. Before performing troubleshooting of the footwell illumination control, check that the interior light control of the illuminated entry system is normal.
2. When one side footwell illumination does not come on, check the light or wire harness that is related to the light. When both right and left footwell lights do not come on, perform the ACTIVE TEST of the footwell illumination.

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1. PERFORM ACTIVE TEST USING INTELLIGENT TESTER Connect the intelligent tester to the DLC3. Turn the engine switch on (IG). Turn the intelligent tester main switch on. Select the item(s) below in the ACTIVE TEST, and check the operation. MAIN BODY (MAIN BODY ECU): DATA LIST Tester Display Test Part Control Range Diagnostic Note STEP LIGHT Footwell lights ON / OFF - OK: Footwell lights come on. OK: PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE NG: Go to next step.
2. CHECK HARNESS AND CONNECTOR (MAIN BODY ECU - BATTERY) Disconnect the E59 main body ECU connector. Measure the voltage according to the value(s) in-the table. Standard voltage TESTER CONNECTION SPECIFIED CONDITION Tester Connection Condition Specified Condition E59-11 (FSPT) - Body ground Always 10 to 14 V NG: REPAIR OR REPLACE HARNESS OR CONNECTOR OK: REPLACE INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY

The engine switch illumination is controlled by the main body ECU. The operation and condition of this control are described below (Light control switch is OFF).

OPERATION CONDITION

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1. PERFORM ACTIVE TEST USING INTELLIGENT TESTER Connect the intelligent tester to the DLC3. Turn the engine switch on (IG). Turn the intelligent tester main switch on. Select the item(s) below in the ACTIVE TEST, and check the operation. MAIN BODY (MAIN BODY ECU): DATA LIST Tester Display Test Part Control Range Diagnostic Note LIGHTING IND Engine switch illumination ON / OFF - OK: Engine switch illumination comes on. OK: PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE NG: Go to next step.
2. INSPECT ENGINE SWITCH Remove the engine switch. Apply battery voltage to the engine switch. Check that the illumination comes on. OK MEASUREMENT CONDITION Measurement Condition Specified Condition Battery positive (+) --> Terminal 11 (SWIL) Battery negative (-) --> Terminal 5 (GND) or 4 (COM) Engine switch illumination comes on NG: REPLACE ENGINE SWITCH OK: Go to next step.
3. CHECK HARNESS AND CONNECTOR (ENGINE SWITCH - MAIN BODY ECU AND BODY GROUND) Disconnect the E61 main body ECU connector. Disconnect the E68 engine switch connector. Measure the resistance according to the value(s) in the table below. Standard resistance TESTER CONNECTION SPECIFIED CONDITION Tester Connection Condition Specified Condition E68-11 (SWIL) - E61-25 (SWIL) Always Below 1 ohms E68-4 (COM) or E68-5 (GND) - Body ground Always Below 1 ohms E68-11 (SWIL) - Body ground Always 10 kohms or higher NG: REPAIR OR REPLACE HARNESS OR CONNECTOR OK: REPLACE INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY

The door mirror foot light is controlled by the mirror ECU. The operation and condition of this control are described below.

OPERATION CONDITION

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1. INSPECT OUTER REAR VIEW MIRROR ASSEMBLY (DOOR MIRROR FOOT LIGHT) HINT: (See «INSPECTION»(ref-283105-S40730243232008041700000) ). NG: REPLACE OUTER REAR VIEW MIRROR ASSEMBLY OK: Go to next step.
2. CHECK HARNESS AND CONNECTOR (OUTER REAR VIEW MIRROR - ECU AND BODY GROUND) Disconnect the E65 outer mirror control ECU connector. Disconnect the 13 or H4 outer rear view mirror connector. Measure the resistance according to the value(s) in the table. Standard resistance: LH Side TESTER CONNECTION SPECIFIED CONDITION Tester Connection Condition Specified Condition E65-17 (LP) - I3-2 Always Below 1 ohms I3-12- Body ground Always Below 1 ohms E65-17 (LP) - Body ground Always 10 kohms or higher RH Side TESTER CONNECTION SPECIFIED CONDITION Tester Connection Condition Specified Condition E65-37 (LP) - H4-2 Always Below 1 ohms H4-12 - Body ground Always Below 1 ohms E65-37 (LP) - Body ground Always 10 kohms or higher NG: REPAIR OR REPLACE HARNESS OR CONNECTOR OK: PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE

The main body ECU receives a parking brake switch signal to control the daytime running light system.

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1. READ VALUE OF INTELLIGENT TESTER Connect the intelligent tester to the DLC3. Turn the engine switch on (IG) and turn the intelligent tester main switch on. Select the item below in the DATA LIST, and read the display on the intelligent tester. MAIN BODY (MAIN BODY ECU): DATA LIST Tester Display Measurement Item/Range Normal Condition Diagnostic Note PARKING BRAKE SW Parking brake SW signal / ON or OFF ON: Parking brake switch is ON OFF: Parking brake switch is OFF - OK: Normal conditions listed above are displayed. OK: PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE NG: Go to next step.
2. INSPECT PARKING BRAKE SWITCH ASSEMBLY Remove the parking brake switch assembly. Measure the resistance according to the value(s) in the table below. Standard resistance TESTER CONNECTION SPECIFIED CONDITION Tester Connection Condition Specified Condition 1 - Switch body Shaft is pushed in (OFF) 10 kohms or higher 1 - Switch body Shaft is not pushed in (ON) Below 1 ohms NG: REPLACE PARKING BRAKE SWITCH ASSEMBLY OK: Go to next step.
3. CHECK HARNESS AND CONNECTOR (SWITCH - INSTRUMENT PANEL J/B ASSEMBLY) Disconnect the DC instrument panel junction block assembly connector. Disconnect the A32 switch connector. Measure the resistance according to the value(s) in the table below. Standard resistance TESTER CONNECTION SPECIFIED CONDITION Tester Connection Condition Specified Condition DC-14 - A32-1 Always Below 1 ohms DC-14 - Body ground Always 10 kohms or higher NG: REPAIR OR REPLACE HARNESS OR CONNECTOR OK: REPLACE INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY

The main body ECU receives a signal from the light control switch, and turns the taillight relay on.

HINT

1. When any of the lights do not illuminate, check the bulb or wire harness that is related to the bulb.
2. When all of the lights that are related to the TAIL relay do not illuminate and the TAIL fuse is normal, read the light control switch TAIL signal value in the data list and perform the taillight relay active test to determine if the malfunction exists on either the switch side or the relay side.

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1. PERFORM ACTIVE TEST USING INTELLIGENT TESTER Connect the intelligent tester to the DLC3. Turn the engine switch on (IG) and turn the intelligent tester main switch on. Select the item below in the ACTIVE TEST and then check that the relay operates. MAIN BODY (MAIN BODY ECU): DATA LIST Tester Display Test Part Control Range Diagnostic Note TAIL LIGHT Taillight relay ON / OFF - OK: Taillight relay operates. (Taillights illuminate.) OK: PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE NG: Go to next step.
2. INSPECT FUSE (TAIL) Remove the TAIL fuse from the instrument panel J/B assembly. Measure the resistance of the fuse. Standard resistance: Below 1 ohms NG: REPLACE FUSE OK: Go to next step.
3. INSPECT TAILLIGHT RELAY Remove the taillight relay from the instrument panel J/B assembly. Measure the resistance according to the value(s) in the table below. Standard resistance TESTER CONNECTION SPECIFIED CONDITION Tester Connection Specified Condition 3 - 5 10 kohms or higher Below 1 ohms (When battery voltage is applied to terminals 1 and 2) 3 - 4 Below 1 ohms 10 kohms or higher (When battery voltage is applied to terminals 1 and 2) NG: REPLACE TAILLIGHT RELAY OK: Go to next step.
4. INSPECT INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY Disconnect the DP and DC instrument panel J/B assembly connectors. Measure the voltage according to the value(s) in the table below. Standard voltage TESTER CONNECTION SPECIFIED CONDITION Tester Connection Condition Specified Condition DC-4 - Body ground Light control switch OFF --> TAIL Below 1 V --> 10 to 14 V DC-5 - Body ground Light control switch OFF --> TAIL Below 1 V --> 10 to 14 V DP-8 - Body ground Light control switch OFF --> TAIL Below 1 V --> 10 to 14 V OK: REPAIR OR REPLACE HARNESS OR CONNECTOR (INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY - BODY GROUND) NG: Go to next step.
5. CHECK HARNESS AND CONNECTOR (BATTERY - INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY) Disconnect the DA instrument panel J/B assembly connector. Measure the voltage according to the value(s) in the table below. Standard voltage TESTER CONNECTION SPECIFIED CONDITION Tester Connection Condition Specified Condition DA-1 - Body ground Always 10 to 14 V NG: REPAIR OR REPLACE HARNESS OR CONNECTOR OK: REPLACE INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY

This circuit detects the state of the engine switch. The AFS ECU receives it from the engine switch.

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Scheme 61

1. INSPECT FUSE (ECU-IG NO. 2 OR H-LP LVL) Remove the ECU-IG No. 2 fuse or H-LP LVL fuse from the instrument panel junction block assembly. Measure the resistance of the fuse. Standard resistance: Below 1 ohms NG: REPLACE FUSE OK: Go to next step.
2. INSPECT AFS ECU Measure the voltage according to the value(s) in the table below. Standard voltage TESTER CONNECTION SPECIFIED CONDITION Tester Connection Condition Specified Condition A22-14 (IGS) - A22-22 (E1) Engine switch off Below 1 V A22-14 (IGS) - A22-22 (E1) Engine switch on (IG) 10 to 14 V A22-15 (IG) - A22-22 (E1) Engine switch off Below 1 V A22-15 (IG) - A22-22 (E1) Engine switch on (IG) 10 to 14 V OK: PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE NG: Go to next step.
3. CHECK WIRE HARNESS (AFS ECU - BATTERY AND BODY GROUND) Disconnect the A22 AFS ECU connector. Measure the voltage and resistance according to the value(s) in the table below. Standard voltage TESTER CONNECTION SPECIFIED CONDITION Tester Connection Condition Specified Condition A22-14 (IGS) - Body ground Engine switch on (IG) 10 to 14 V A22-15 (IG) - Body ground Engine switch on (IG) 10 to 14 V Standard resistance TESTER CONNECTION SPECIFIED CONDITION Tester Connection Condition Specified Condition A22-22 (E1) - Body ground Always Below 1 ohms NG: REPAIR OR REPLACE HARNESS OR CONNECTOR OK: REPLACE AFS ECU

When the AFS switch is pushed (ON), the AFS ECU will cancel the intelligent AFS control and turns on the AFS OFF indicator light.

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Scheme 63

1. READ VALUE OF INTELLIGENT TESTER Connect the intelligent tester to the DLC3. Turn the engine switch on (IG). Turn the intelligent tester main switch on. Turn the clearance sonar main switch on. Select the item below in the DATA LIST, and read its value displayed on the intelligent tester. AFS (AFS ECU) DATA LIST Tester Display Measurement Item/Range Normal Condition Diagnostic Note AFS OFF SW AFS OFF switch signal ON / OFF ON: AFS OFF switch pushed (ON) OFF: AFS OFF switch not pushed (OFF) - OK: PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE NG: Go to next step.
2. INSPECT AFS OFF SWITCH HINT: (See «INSPECTION»(ref-283105-S41247121362008041700000) ) NG: REPLACE AFS OFF SWITCH OK: Go to next step.
3. CHECK HARNESS AND CONNECTOR (AFS OFF SWITCH - AFS ECU AND BODY GROUND) Disconnect the A22 AFS ECU connector. Disconnect the E5 AFS OFF switch connector. Measure the resistance according to the value (s) in the table below. Standard resistance TESTER CONNECTION SPECIFIED CONDITION Tester Connection Condition Specified Condition A22-32 (MSW) - E5-2 Always Below 1 ohms E5-1 - Body ground Always Below 1 ohms A22-32 (MSW) - Body ground Always Below 1 ohms NG: REPAIR OR REPLACE HARNESS OR CONNECTOR OK: REPLACE AFS ECU

By connecting terminals LVL and CG of the DLC3, the AFS ECU initializes the height control sensor signal.

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1. INSPECT DLC3 TERMINAL VOLTAGE Measure the voltage according to the value(s) in the table below. Standard voltage TESTER CONNECTION SPECIFIED CONDITION Tester Connection Condition Specified Condition E21-4 (CG) - Body ground Engine switch on (IG) 10 to 14 V E21-4 (CG) - Body ground Engine switch off Below 1 V OK: PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE NG: Go to next step.
2. CHECK HARNESS AND CONNECTOR (DLC3 - HEADLIGHT BEAM LEVEL CONTROL ECU) Disconnect the A22 AFS ECU connector. Measure the resistance according to the value(s) in the table below. Standard resistance TESTER CONNECTION SPECIFIED CONDITION Tester Connection Condition Specified Condition A22-7 (INIT) - E21-8 (LVL) Always Below 1 ohms A22-7 (INIT) - Body ground Always 10 kohms or higher NG: REPAIR OR REPLACE HARNESS OR CONNECTOR OK: Go to next step.
3. CHECK HARNESS AND CONNECTOR (DLC3 - BODY GROUND) Measure the resistance according to the value(s) in the table below. Standard resistance TESTER CONNECTION SPECIFIED CONDITION Tester Connection Condition Specified Condition E21-4 (CG) - Body ground Always Below 1 ohms NG: REPAIR OR REPLACE HARNESS OR CONNECTOR OK: REPLACE AFS ECU

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1. DISCONNECT CABLE FROM NEGATIVE BATTERY TERMINAL (for HID Headlight)
2. REMOVE COOL AIR INTAKE DUCT SEAL (See «REMOVAL»(ref-283116-S42135128222008041700000) )
3. REMOVE FRONT BUMPER ASSEMBLY (See «DISASSEMBLY»(ref-283116-S04634594762008041700000) )
4. REMOVE HOOD HINGE COVER (See «REMOVAL»(ref-283123-S18755761682008041700000) )
5. REMOVE ENGINE ROOM SIDE COVER (See «REMOVAL»(ref-283123-S18755761682008041700000) )
6. REMOVE HOOD TO FRONT FENDER SEAL
7. REMOVE HEADLIGHT ASSEMBLY Remove the 3 bolts and screw. Disconnect the connectors and remove the headlight assembly.

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1. REMOVE FRONT BUMPER SIDE SUPPORT Remove the 3 screws and the front bumper side support.
2. REMOVE NO. 2 HEADLIGHT BULB Remove the No. 2 headlight bulb as shown in the illustration.
3. REMOVE ADAPTER ASSEMBLY (for Halogen Headlight) Remove the adapter assembly as shown in the illustration.
4. REMOVE NO. 1 HEADLIGHT BULB (for Halogen Headlight) Release the set spring and remove the No. 1 headlight bulb as shown in the illustration.
5. REMOVE HEADLIGHT SOCKET COVER (for HID Headlight) Remove the headlight socket cover as shown in the illustration.
6. REMOVE DISCHARGE HEADLIGHT BULB (for HID Headlight) Separate the light control ECU socket as shown in the illustration. Release the set spring and remove the discharge headlight bulb as shown in the illustration.
7. REMOVE FRONT TURN SIGNAL LIGHT BULB Turn the front turn signal light bulb and the front turn signal light socket in the direction indicated by the arrow and remove them as a unit. Remove the front turn signal light bulb from the front turn signal light socket.
8. REMOVE CLEARANCE LIGHT BULB Turn the clearance light bulb and the clearance light socket in the direction indicated by the arrow and remove them as a unit. Remove the clearance light bulb from the clearance light socket.
9. REMOVE HEADLIGHT LEVELING MOTOR (for HID Headlight) Align the notches of the headlight leveling motor and the housing, and pull out the headlight leveling motor slightly. Lower the tip of the headlight leveling motor to disengage it from the reflector and remove the headlight leveling motor.
10. REMOVE HEADLIGHT LEVELING MOTOR BASE RACKING (for HID Headlight) Remove the headlight leveling motor base packing. NOTE: After the headlight leveling motor base packing is removed, be sure to replace it with a new one. Failure to do this may cause water ingress.
11. REMOVE HEADLIGHT PROTECTOR (for HID Headlight) Remove the screw and the headlight protector.
12. REMOVE LIGHT CONTROL ECU SUB-ASSEMBLY (for HID Headlight) Remove the 4 screws. Disconnect the connector and remove the light control ECU sub-assembly.
13. REMOVE HEADLIGHT GASKET (for HID Headlight) Remove the headlight gasket. NOTE: After the headlight gasket is removed, be sure to replace it with a new one. Failure to do this may cause water ingress.
14. REMOVE HEADLIGHT SWIVEL MOTOR (for HID Headlight) Disconnect the connector. Remove the 3 screws and the headlight swivel motor.
15. REMOVE HEADLIGHT CORD (for HID Headlight) Remove the screw and the headlight cord.

See also:
• INSPECTION
• CAN COMMUNICATION
• AIRBAG SYSTEM
• REMOVAL
• INSTALLATION