Lighting (Diagnostic Codes & Symptom Tests): Overview Lexus LX J200

DESCRIPTION

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

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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 B1244 output does not occur. NG --> See step 2 OK --> See step 5
2. READ VALUE USING TECHSTREAM (AUTOMATIC LIGHT CONTROL SENSOR) Using the Techstream, read the Data List. MAIN BODY Tester Display Measurement Item/Range Normal Condition Diagnostic Note Illumination Rate Info Illuminance detected by automatic light control sensor/0 to 235600 lx Illuminance value displayed - OK Output illuminance is as shown in table above. NG --> See step 3 OK --> REPLACE MAIN BODY ECU
3. CHECK MAIN BODY ECU (CLTB - CLTE VOLTAGE) Measure the voltage according to the value(s) in the table below. Standard Voltage Tester Connection Switch Condition Specified Condition E2-20 (CLTB) - E2-18 (CLTE) Engine switch on (IG) 11 to 14 V NG --> REPLACE MAIN BODY ECU OK: Go to next step
4. CHECK HARNESS AND CONNECTOR (MAIN BODY ECU - AUTOMATIC LIGHT CONTROL SENSOR) Disconnect the E2 ECU connector. Disconnect the F9 sensor connector. Measure the resistance according to the value(s) in the table below. Standard Resistance Tester Connection Condition Specified Condition E2-20 (CLTB) - F9-6 (CLTB) Always Below 1 ohms E2-19 (CLTS) - F9-5 (CLTS) E2-18 (CLTE) - F9-3 (CLTE) E2-20 (CLTB) - Body ground Always 10 kohms or higher E2-19 (CLTS) - Body ground E2-18 (CLTE) - Body ground NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR OK --> See step 6
5. USE SIMULATION METHOD TO CHECK. Refer to «ELECTRONIC CIRCUIT INSPECTION PROCEDURE»
6. REPLACE AUTOMATIC LIGHT CONTROL SENSOR. Refer to «REMOVAL - Step 3»

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

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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.

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

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

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

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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 output does not occur. NG --> See step 3 OK --> See step 2
2. USE SIMULATION METHOD TO CHECK. Refer to «ELECTRONIC CIRCUIT INSPECTION PROCEDURE»
3. CHECK FOR DTC (AIR SUSPENSION SYSTEM) Check for DTCs. Refer to «DTC CHECK / CLEAR». OK DTC "C1712/12 Front Height Control Sensor LH Circuit Malfunction" and "C1714/14 Rear Height Control Sensor LH Circuit Malfunction" output does not occur. NG --> See step 8 OK: Go to next step
4. READ VALUE USING TECHSTREAM (AFS ECU) Using the Techstream, read the Data List. AFS 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 - OK Power supply voltage is approximately 5 V and height control sensor voltage changes when vehicle height is changed. NG --> See step 5 OK --> See step 7
5. CHECK HARNESS AND CONNECTOR (AFS ECU - SUSPENSION CONTROL ECU) Disconnect the E91, K31 and K32 ECU connectors. Measure the resistance according to the value(s) in the table below. Standard Resistance Tester Connection Condition Specified Condition E91-17 (SHFL) - K31-22 (SHF2) Always Below 1 ohms E91-18 (SBR) - K31-23 (SHB5) E91-19 (SHRL) - K32-28 (SHR2) E91-21 (SGR) - K31-11 (SHG5) E91-17 (SHFL) - Body ground Always 10 kohms or higher E91-18 (SBR) - Body ground E91-19 (SHRL) - Body ground E91-21 (SGR) - Body ground NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR OK: Go to next step
6. CHECK SUSPENSION CONTROL ECU Measure the voltage according to the value(s) in the table below. Standard Voltage Tester Connection Condition Specified Condition K31-23 (SHB5) - K31-11 (SHG5) Engine switch on (IG) 4.5 to 5.5 V K31-22 (SHF2) - K31-11 (SHG5) While engine running, height control switch changed from HIGH to NORM, and vehicle height adjustment finished 2.20 to 2.80 V K32-28 (SHR2) - K31-11 (SHG5) While engine running, height control switch changed from HIGH to NORM, and vehicle height adjustment finished 2.21 to 2.80 V Measure the resistance according to the value(s) in the table below. Standard Resistance Tester Connection Condition Specified Condition K31-11 (SHG5) - Body ground Always Below 1 ohms NG --> See step 9 OK --> See step 7
7. REPLACE AFS ECU. Refer to «REMOVAL»
8. GO TO AIR SUSPENSION SYSTEM. Refer to «DIAGNOSTIC TROUBLE CODE CHART»
9. REPLACE SUSPENSION CONTROL ECU. Refer to «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.

HINT

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

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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 B2417 or B2418 output does not occur. NG --> See step 2 OK --> See step 7
2. PERFORM ACTIVE TEST USING TECHSTREAM (HEADLIGHT LEVELING MOTOR) Using the Techstream, perform the Active Test. AFS 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 --> See step 3 OK --> See step 8
3. READ VALUE USING TECHSTREAM (AFS ECU) Using the Techstream, read the Data List. AFS 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 - OK Power supply voltage is 11 to 14 V. NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR (AFS ECU - BATTERY AND BODY GROUND) OK: Go to next step
4. CHECK HARNESS AND CONNECTOR (AFS ECU - BODY GROUND) Disconnect the E91 ECU connector. Measure the resistance according to the value(s) in the table below. Standard Resistance Tester Connection Condition Specified Condition E91-22 (E1) - Body ground Always Below 1 ohms NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR OK: Go to next step
5. CHECK HARNESS AND CONNECTOR (AFS ECU - HEADLIGHT LEVELING ACTUATOR) Disconnect the E91 ECU connector. Disconnect the A42 and A48 actuator connectors. Measure the resistance according to the value(s) in the table below. Standard Resistance for LH for RH Tester Connection Condition Specified Condition E91-3 (LHT) - A42-1 (LHIG) Always Below 1 ohms E91-27 (LH-) - A42-3 (LH E) E91-30 (LH+) - A42-2 (LH T) E91-3 (LHT) - Body ground Always 10 kohms or higher E91-27 (LH-) - Body ground E91-30 (LH+) - Body ground Tester Connection Condition Specified Condition E91-4 (RHT) - A48-1 (RHIG) Always Below 1 ohms E91-28 (RH-) - A48-3 (RH E) E91-11 (RH+) - A48-2 (RH T) E91-4 (RHT) - Body ground Always 10 kohms or higher E91-28 (RH-) - Body ground E91-11 (RH+) - Body ground NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR OK: Go to next step
6. CHECK HEADLIGHT LEVELING MOTOR (OPERATION) Temporarily replace the headlight with a new or normally functioning one. Check for DTCs. Refer to «DTC CHECK / CLEAR». OK DTC B1247 or B2418 output does not occur. NG --> See step 9 OK --> END (HEADLIGHT IS DEFECTIVE)
7. USE SIMULATION METHOD TO CHECK. Refer to «ELECTRONIC CIRCUIT INSPECTION PROCEDURE»
8. REPLACE AFS ECU. Refer to «REMOVAL»
9. REPLACE AFS ECU. Refer to «REMOVAL»

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

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

The headlight leveling motor operates by receiving a signal from the AFS ECU. The AFS ECU detects the headlight leveling motor status using the signal from the headlight leveling motor.

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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 B2424 or B2425 output does not occur. NG --> See step 2 OK --> See step 6
2. READ VALUE USING TECHSTREAM (AFS ECU) Using the Techstream, read the Data List. AFS 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 - OK Power supply voltage is 11 to 14 V. NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR (AFS ECU - BATTERY AND BODY GROUND) OK: Go to next step
3. CHECK HARNESS AND CONNECTOR (AFS ECU - BODY GROUND) Disconnect the E91 ECU connector. Measure the resistance according to the value(s) in the table below. Standard Resistance Tester Connection Condition Specified Condition E91-22 (E1) - Body ground Always Below 1 ohms NG --> REPAIR OR REPLACE HARNESS AND CONNECTOR OK: Go to next step
4. CHECK HARNESS AND CONNECTOR (AFS ECU - HEADLIGHT) Disconnect the E91 ECU connector. Disconnect the A42 and A48 actuator connectors. Measure the resistance according to the value(s) in the table below. Standard Resistance for LH for RH Tester Connection Condition Specified Condition E91-30 (LH+) - A42-2 (LH T) Always Below 1 ohms E91-30 (LH+) - Body ground Always 10 kohms or higher Tester Connection Condition Specified Condition E91-11 (RH+) - A48-2 (RH T) Always Below 1 ohms E91-11 (RH+) - Body ground Always 10 kohms or higher NG --> REPAIR OR REPLACE HARNESS AND CONNECTOR OK: Go to next step
5. CHECK HEADLIGHT LEVELING MOTOR (OPERATION) Temporarily replace the headlight with a new or normally functioning one. Check for DTCs. Refer to «DTC CHECK / CLEAR». OK DTC B2424 or B2425 output does not occur. NG --> See step 7 OK --> END (HEADLIGHT IS DEFECTIVE)
6. USE SIMULATION METHOD TO CHECK. Refer to «ELECTRONIC CIRCUIT INSPECTION PROCEDURE»
7. REPLACE AFS ECU. Refer to «REMOVAL»

1. The AFS ECU receives an engine running status signal and shift position signal from the ECM using CAN communication.

1. The AFS ECU receives front speed sensor LH and RH signals from the skid control ECU using CAN communication.

1. The AFS ECU receives the headlight status signal from the main body ECU using CAN communication.

1. The AFS ECU sends an AFS OFF indicator light on or off demand signal to the combination meter ECU using CAN communication.

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

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The main body ECU receives a headlight switch information signal from the light control switch, and illuminates the headlight low beam.

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1. READ VALUE USING TECHSTREAM (HEADLIGHT DIMMER SWITCH) Using the Techstream, read the Data List. MAIN BODY Tester Display Measurement Item/Range Normal Condition Diagnostic Note Head Light SW (Head) Headlight dimmer switch (Head) signal/ON or OFF ON: Headlight dimmer switch (Head) on OFF: Headlight dimmer switch off - OK When the headlight dimmer switch operation is performed, the result will be the same as above. NG --> See step 3 OK: Go to next step
2. PERFORM ACTIVE TEST USING TECHSTREAM (HEADLIGHT) Using the Techstream, perform the Active Test. MAIN BODY Tester Display Test Part Control Range Diagnostic Note Headlight Relay Headlight OFF/ON - OK Headlight low beam turns on/off. NG --> See step 5 OK --> REPLACE MAIN BODY ECU
3. INSPECT HEADLIGHT DIMMER SWITCH Remove the headlight dimmer switch. Refer to «INSPECTION». Measure the resistance according to the value(s) in the table below. Standard Resistance Tester Connection Switch Condition Specified Condition 18 (T) - 12 (EL) Headlight dimmer switch (Light control switch) head Below 1 ohms 18 (T) - 12 (EL) Headlight dimmer switch (Light control switch) off 10 kohms or higher NG --> See step 9 OK: Go to next step
4. CHECK HARNESS AND CONNECTOR (HEADLIGHT DIMMER SWITCH - MAIN BODY ECU AND BODY GROUND) Disconnect the E14 switch connector. Disconnect the E1 and E2 ECU connectors. Measure the resistance according to the value(s) in the table below. Standard Resistance Tester Connection Condition Specified Condition E14-20 (H) - E2-17 (HEAD) Always Below 1 ohms E14-18 (T) - E1-23 (TAIL) E14-12 (EL) - Body ground E14-20 (H) - Body ground Always 10 kohms or higher E14-18 (T) - Body ground NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR OK --> REPLACE MAIN BODY ECU
5. INSPECT HEADLIGHT RELAY (HEAD LO) Remove the HEAD LO relay from the engine room relay block. Measure the resistance according to the value(s) in the table below. Standard Resistance Tester Connection Condition Specified Condition 3 - 5 Battery voltage not applied to terminals 1 and 2 10 kohms or higher Battery voltage applied to terminals 1 and 2 Below 1 ohms NG --> REPLACE HEAD LO RELAY OK: Go to next step
6. CHECK HARNESS AND CONNECTOR (HEADLIGHT RELAY (HEAD LO) - BATTERY) Remove the HEAD LO relay from the engine room relay block. Measure the voltage according to the value(s) in the table below. Standard Voltage Tester Connection Condition Specified Condition HEAD LO relay terminal 1 - Body ground Always 11 to 14 V HEAD LO relay terminal 5 - Body ground NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR OK: Go to next step
7. CHECK HARNESS AND CONNECTOR (HEADLIGHT - HEAD LO RELAY AND BODY GROUND) Remove the HEAD LO relay from the engine room relay block. Disconnect the A40 and A46 light connectors. Measure the resistance according to the value(s) in the table below. Standard Resistance for LH for RH Tester Connection Condition Specified Condition HEAD LO relay terminal 3 - A40-2 (LO) Always Below 1 ohms A40-6 (E) - Body ground A40-2 (LO) - Body ground Always 10 kohms or higher Tester Connection Condition Specified Condition HEAD LO relay terminal 3 - A46-2 (LO) Always Below 1 ohms A46-6 (E) - Body ground A46-2 (LO) - Body ground Always 10 kohms or higher NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR OK: Go to next step
8. CHECK HEADLIGHT (LOW BEAM) Disconnect the 2B ECU connector. Using a service wire, connect terminal 2B-18 (HRLY) on the wire harness side and the body ground. Check that the headlight low beam illuminates. OK Headlight low beam illuminates. NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR (HEAD LO RELAY - MAIN BODY ECU) OK --> REPLACE MAIN BODY ECU
9. REPLACE HEADLIGHT DIMMER SWITCH. Refer to «REMOVAL»

The main body ECU receives light control switch and dimmer switch information signals from the headlight dimmer switch, and illuminates the headlight high beam.

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1. READ VALUE USING TECHSTREAM (HEADLIGHT DIMMER SWITCH) Using the Techstream, read the Data List. MAIN BODY Tester Display Test Part Control Range Diagnostic Note Head Light SW (HEAD) Headlight switch signal (Head) /ON or OFF ON: Headlight switch (Head) on OFF: Headlight switch off - OK When the headlight dimmer switch operation is performed, the result will be the same as above. NG --> See step 3 OK: Go to next step
2. PERFORM ACTIVE TEST USING TECHSTREAM (HEADLIGHT) Using the Techstream, perform the Active Test. MAIN BODY Tester Display Test Part Control Range Diagnostic Note Head Light Hi Headlight (Hi) OFF/ON - OK Headlight hi beam turns on/off. NG --> See step 5 OK --> REPLACE MAIN BODY ECU
3. INSPECT HEADLIGHT DIMMER SWITCH Remove the headlight dimmer switch. Refer to «INSPECTION». Measure the resistance according to the value(s) in the table below. Standard Resistance Tester Connection Condition Specified Condition 18 (T) - 12 (EL) Headlight dimmer switch (Light control switch) head Below 1 ohms 20 (H) - 12 (EL) 17 (HF) - 12 (EL) Headlight dimmer switch (Light control switch) flash 11 (HU) - 12 (EL) 11 (HU) - 12 (EL) Headlight dimmer switch (Light control switch) high 18 (T) - 12 (EL) Headlight dimmer switch (Light control switch) off 10 kohms or higher 20 (H) - 12 (EL) NG --> See step 17 OK: Go to next step
4. CHECK HARNESS AND CONNECTOR (HEADLIGHT DIMMER SWITCH - MAIN BODY ECU AND BODY GROUND) Disconnect the E14 switch connector. Disconnect the E1, E2 and 2D ECU connectors. Measure the resistance according to the value(s) in the table below. Standard Resistance Tester Connection Condition Specified Condition E2-17 (HEAD) - E14-20 (H) Always Below 1 ohms E1-23 (TAIL) - E14-18 (T) E1-13 (HF) - E14-17 (HF) 2D-13 (HU) - E14-11 (HU) E14-12 (EL) - Body ground E2-17 (HEAD) - Body ground Always 10 kohms or higher E1-23 (TAIL) - Body ground E1-13 (HF) - Body ground 2D-13 (HU) - Body ground NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR OK --> REPLACE MAIN BODY ECU
5. CHECK HARNESS AND CONNECTOR (HEADLIGHT RELAY (HEAD HI) - BATTERY) Remove the headlight relay from the engine room relay block. Measure the voltage according to the value(s) in the table below. Standard Voltage Tester Connection Switch Condition Specified Condition HEAD HI relay terminal 2 - Body ground Always 11 to 14 V HEAD HI relay terminal 3 - Body ground NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR OK: Go to next step
6. CHECK HARNESS AND CONNECTOR (DRL NO. 3 OR RR A/C RELAY - BODY GROUND) Remove the DRL No. 3 or RR A/C relay from the engine room relay block. Measure the voltage according to the value(s) in the table below. Standard Voltage Tester Connection Switch Condition Specified Condition DRL No, 3 or RR A/C relay terminal 1 - Body ground Light control switch head, dimmer switch low 11 to 14 V Light control switch OFF Below 1 V Measure the resistance according to the value(s) in the table below. Standard Resistance Tester Connection Switch Condition Specified Condition DRL No, 3 or RR A/C relay terminal 2 - Body ground Always Below 1 ohms NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR OK: Go to next step
7. CHECK HARNESS AND CONNECTOR (DRL NO. 4 RELAY - BODY GROUND) Remove the DRL No. 4 relay from the engine room relay block. Measure the voltage according to the value(s) in the table below. Standard Voltage Tester Connection Switch Condition Specified Condition DRL No. 4 relay terminal 1 - Body ground Light control switch head, dimmer switch low 11 to 14 V Light control switch OFF Below 1 V Measure the resistance according to the value(s) in the table below. Standard Resistance Tester Connection Switch Condition Specified Condition DRL No. 4 relay terminal 2 - Body ground Always Below 1 ohms NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR OK: Go to next step
8. INSPECT HEADLIGHT RELAY (HEAD HI) Remove the headlight relay from the engine room relay block. Measure the resistance according to the value(s) in the table below. Standard Resistance Tester Connection Condition Specified Condition 3 - 5 Battery voltage not applied to terminals 1 and 2 10 kohms or higher Battery voltage applied to terminals 1 and 2 Below 1 ohms NG --> REPLACE HEADLIGHT RELAY (HEAD HI) OK: Go to next step
9. INSPECT DRL NO. 3 OR RR A/C RELAY Remove the DRL No. 3 or RR A/C relay from the engine room relay block. Measure the resistance according to the value(s) in the table below. Standard Resistance Tester Connection Condition Specified Condition 3 - 5 Battery voltage not applied to terminals 1 and 2 10 kohms or higher Battery voltage applied to terminals 1 and 2 Below 1 ohms 3 - 4 Battery voltage not applied to terminals 1 and 2 Below 1 ohms Battery voltage applied to terminals 1 and 2 10 kohms or higher NG --> REPLACE DRL NO. 3 OR RR A/C RELAY OK: Go to next step
10. INSPECT DRL NO. 4 RELAY Remove the DRL No. 4 relay from the engine room relay block. Measure the resistance according to the value(s) in the table below. Standard Resistance Tester Connection Condition Specified Condition 3 - 5 Battery voltage not applied to terminals 1 and 2 10 kohms or higher Battery voltage applied to terminals 1 and 2 Below 1 ohms NG --> REPLACE DRL NO. 4 RELAY OK: Go to next step
11. CHECK HARNESS AND CONNECTOR (HEAD HI RELAY - DRL NO. 3 OR RR A/C RELAY AND DRL NO. 4 RELAY) Remove the headlight relay, DRL No. 3 or RR A/C relay and DRL No. 4 relay from the engine room relay block. Measure the resistance according to the value(s) in the table below. Standard Resistance Tester Connection Condition Specified Condition HEAD HI relay terminal 5 - DRL No. 3 or RR A/C relay terminal 5 Always Below 1 ohms DRL No. 3 or RR A/C Relay terminal 3 - DRL No. 4 Relay terminal 5 HEAD HI relay terminal 5 - Body ground Always 10 kohms or higher NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR OK: Go to next step
12. CHECK HARNESS AND CONNECTOR (HEAD HI RELAY - DRL NO. 4 RELAY AND BODY GROUND) Remove the headlight relay and DRL No. 4 relay from the engine room relay block. Measure the resistance according to the value(s) in the table below. Standard Resistance Tester Connection Condition Specified Condition HEAD HI relay terminal 5 - DRL No. 4 relay terminal 5 Always Below 1 ohms DRL No. 4 relay terminal 3 - Body ground HEAD HI relay terminal 5 - Body ground Always 10 kohms or higher NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR OK: Go to next step
13. CHECK HARNESS AND CONNECTOR (DRL NO. 3 OR RR A/C RELAY - DAYTIME RUNNING LIGHT RESISTOR) Remove the DRL No. 3 or RR A/C relay from the engine room relay block. Measure the resistance according to the value(s) in the table below. Standard Resistance Tester Connection Switch Condition Specified Condition DRL No. 3 or RR A/C relay terminal 4 - A33-1 (B) Always Below 1 ohms A33-1 (B) - Body ground Always 10 kohms or higher NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR OK: Go to next step
14. CHECK HARNESS AND CONNECTOR (DAYTIME RUNNING LIGHT RESISTOR - BODY GROUND) Remove the DRL No. 3 or RR A/C relay from the engine room relay block. Measure the resistance according to the value(s) in the table below. Standard Resistance Tester Connection Switch Condition Specified Condition A33-2 (E) - Body ground Always Below 1 ohms NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR OK: Go to next step
15. CHECK HARNESS AND CONNECTOR (HEAD HI RELAY - MAIN BODY ECU) Remove the headlight relay from the engine room relay block. Measure the resistance according to the value(s) in the table below. Standard Resistance Tester Connection Condition Specified Condition HEAD HI relay terminal 1 - 2B-16 (DRL)*1 Always Below 1 ohms HEAD HI relay terminal 1 - 2B-16 (DIM)*2 Always Below 1 ohms HEAD HI relay terminal 1 - Body Ground Always 10 kohms or higher *1: for U.S.A. *2: for except U.S.A. NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR OK: Go to next step
16. CHECK MAIN BODY ECU Temporarily replace the main body ECU with a new or normally functioning one. Check that the headlight high beam illuminates. OK Headlight high beam illuminates NG --> See step 18 OK --> END (MAIN BODY ECU IS DEFECTIVE)
17. REPLACE HEADLIGHT DIMMER SWITCH. Refer to «REMOVAL»
18. REPLACE DAYTIME RUNNING LIGHT RESISTOR. Refer to «REMOVAL»

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1. CHECK FOR DTC Check for DTCs. Refer to «DTC CHECK / CLEAR». OK DTC B2402 output does not occur. NG --> See step 14 OK: Go to next step
2. READ VALUE USING TECHSTREAM (HEADLIGHT DIMMER SWITCH) Using the Techstream, read the Data List. MAIN BODY Tester Display Measurement Item/Range Normal Condition Diagnostic Note Head Light SW (Tail) Headlight dimmer switch (Tail) signal/ON or OFF ON: Headlight dimmer switch (Tail) on OFF: Headlight dimmer switch off - OK When the headlight dimmer switch operation is performed, the result will be the same as above. NG --> See step 4 OK: Go to next step
3. PERFORM ACTIVE TEST USING TECHSTREAM (TAILLIGHT) Using the Techstream, perform the Active Test. MAIN BODY Tester Display Test Part Control Range Diagnostic Note Taillight Relay Taillight OFF/ON - OK Taillight turns on/off. NG --> See step 6 OK --> REPLACE MAIN BODY ECU
4. INSPECT HEADLIGHT DIMMER SWITCH Remove the headlight dimmer switch. Refer to «INSPECTION - Step 1». Measure the resistance according to the value(s) in the table below. Standard Resistance Tester Connection Condition Specified Condition 18 (T) - 12 (EL) Headlight dimmer switch (Light control switch) tail Below 1 ohms 18 (T) - 12 (EL) Headlight dimmer switch (Light control switch) off 10 kohms or higher NG --> See step 15 OK: Go to next step
5. CHECK HARNESS AND CONNECTOR (HEADLIGHT DIMMER SWITCH - MAIN BODY ECU AND BODY GROUND) Disconnect the E14 switch connector. Disconnect the E1 ECU connector. Measure the resistance according to the value(s) in the table below. Standard Resistance Tester Connection Condition Specified Condition E14-18 (T) - E1-23 (TAIL) Always Below 1 ohms E14-12 (EL) - Body ground E14-18 (T) - Body ground Always 10 kohms or higher NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR OK --> REPLACE MAIN BODY ECU
6. CHECK HARNESS AND CONNECTOR (MAIN BODY ECU - BODY GROUND) Disconnect the 2A ECU connector. Measure the voltage according to the value(s) in the table below. Standard Voltage Tester Connection Switch Condition Specified Condition 2A-1 - Body ground Always 11 to 14 V NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR OK: Go to next step
7. CHECK MAIN BODY ECU Measure the voltage according to the value(s) in the table below. Standard Voltage Tester Connection Switch Condition Specified Condition 2B-8 (TRLY) - Body ground Engine switch on (IG) and headlight dimmer switch (tail) on 11 to 14 V 2C-22 (TRLY) - Body ground NG --> REPLACE MAIN BODY ECU OK: Go to next step
8. CONFIRM LIGHT POSITION Check the malfunctioning light. RESULT Result Proceed to Clearance light does not illuminate A Front side marker light does not illuminate B Rear side marker light does not illuminate C Taillight does not illuminate D License plate light does not illuminate E E --> See step 13 D --> See step 12 C --> See step 11 B --> See step 10 A: Go to next step
9. CHECK HARNESS AND CONNECTOR (HEADLIGHT - MAIN BODY ECU AND BODY GROUND) Disconnect the 2B ECU connector. Disconnect the A41 and A47 light connectors. Measure the resistance according to the value(s) in the table below. Standard Resistance for LH for RH Tester Connection Condition Specified Condition 2B-8 (TRLY) - A41-3 (B) Always Below 1 ohms A41-1 (E) - Body ground A41-3 (B) - Body ground Always 10 kohms or higher Tester Connection Condition Specified Condition 2B-8 (TRLY) - A47-3 (B) Always Below 1 ohms A47-1 (E) - Body ground A47-3 (B) - Body ground Always 10 kohms or higher NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR OK --> See step 16
10. CHECK HARNESS AND CONNECTOR (HEADLIGHT - MAIN BODY ECU AND BODY GROUND) Disconnect the 2B ECU connector. Disconnect the A40 and A46 light connectors. Measure the resistance according to the value(s) in the table below. Standard Resistance for LH for RH Tester Connection Condition Specified Condition 2B-8 (TRLY) - A40-8 (B) Always Below 1 ohms A40-11 (E) - Body ground A40-8 (B) - Body ground Always 10 kohms or higher Tester Connection Condition Specified Condition 2B-8 (TRLY) - A46-8 (B) Always Below 1 ohms A46-11 (E) - Body ground A46-8 (B) - Body ground Always 10 kohms or higher NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR OK --> See step 16
11. CHECK HARNESS AND CONNECTOR (REAR COMBINATION LIGHT - MAIN BODY ECU AND BODY GROUND) Disconnect the 2C ECU connector. Disconnect the K4 and L3 light connectors. Measure the resistance according to the value(s) in the table below. Standard Resistance for LH for RH Tester Connection Condition Specified Condition 2C-22 (TRLY) - K4-6 (TL) Always Below 1 ohms K4-3 (E) - Body ground K4-6 (TL) - Body ground Always 10 kohms or higher Tester Connection Condition Specified Condition 2C-22 (TRLY) - L3-6 (TL) Always Below 1 ohms L3-3 (E) - Body ground L3-6 (TL) - Body ground Always 10 kohms or higher NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR OK --> See step 17
12. CHECK HARNESS AND CONNECTOR (REAR LIGHT - MAIN BODY ECU AND BODY GROUND) Disconnect the 2C ECU connector. Disconnect the S11 and S12 light connectors. Measure the resistance according to the value(s) in the table below. Standard Resistance for LH for RH Tester Connection Condition Specified Condition 2C-22 (TRLY) - S11-3 Always Below 1 ohms S11-1 - Body ground S11-3 - Body ground Always 10 kohms or higher Tester Connection Condition Specified Condition 2C-22 (TRLY) - S12-3 Always Below 1 ohms S12-1 - Body ground S12-3 - Body ground Always 10 kohms or higher NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR OK --> See step 18
13. CHECK HARNESS AND CONNECTOR (LICENSE PLATE LIGHT - MAIN BODY ECU AND BODY GROUND) Disconnect the 2C ECU connector. Disconnect the S23 light connector. Measure the resistance according to the value(s) in the table below. Standard Resistance Tester Connection Condition Specified Condition 2C-22 (TRLY) - S23-2 (B) Always Below 1 ohms S23-1 (E) - Body ground S23-2 (B )- Body ground Always 10 kohms or higher NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR OK --> See step 19
14. GO TO DIAGNOSTIC TROUBLE CODE CHART. Refer to «DIAGNOSTIC TROUBLE CODE CHART»
15. REPLACE HEADLIGHT DIMMER SWITCH. Refer to «REMOVAL»
16. REPLACE HEADLIGHT. Refer to «REMOVAL»
17. REPLACE REAR COMBINATION LIGHT. Refer to «REMOVAL»
18. REPLACE REAR LIGHT. Refer to «REMOVAL»
19. REPLACE LICENSE PLATE LIGHT. Refer to «REMOVAL»

The main body ECU receives a front fog light switch information signal from the light control switch (front fog switch), and illuminates the front fog lights.

Scheme 148

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1. READ VALUE USING TECHSTREAM (HEADLIGHT DIMMER SWITCH) Using the Techstream, read the Data List. MAIN BODY Tester Display Measurement Item/Range Normal Condition Diagnostic Note Front Fog Light SW Front fog light switch signal/ON or OFF ON: Front fog light switch on OFF: Front fog light switch off - OK When headlight dimmer switch operation is performed, the result will be the same as above. NG --> See step 3 OK: Go to next step
2. PERFORM ACTIVE TEST USING TECHSTREAM (FRONT FOG LIGHT RELAY) Using the Techstream, perform the Active Test. MAIN BODY Tester Display Test Part Control Range Diagnostic Note Front Fog Light Relay Front fog light OFF/ON - OK Fog light turns on/off. NG --> See step 5 OK --> REPLACE MAIN BODY ECU
3. INSPECT HEADLIGHT DIMMER SWITCH Remove the headlight dimmer switch. Refer to «INSPECTION». Measure the resistance according to the value(s) in the table below. Standard Resistance Tester Connection Switch Condition Specified Condition 4 (BFG) - 3 (LFG) Headlight dimmer switch (Front fog light switch) on Below 1 ohms Headlight dimmer switch (Front fog light switch) off 10 kohms or higher NG --> See step 9 OK: Go to next step
4. CHECK HARNESS AND CONNECTOR (HEADLIGHT DIMMER SWITCH - MAIN BODY ECU AND BODY GROUND) Disconnect the E14 switch connector. Disconnect the E2 ECU connector. Measure the resistance according to the value(s) in the table below. Standard Resistance Tester Connection Condition Specified Condition E14-4 (BFG) - E2-28 (FFOG) Always Below 1 ohms E14-3 (LFG) - Body ground E14-4 (BFG) - Body ground Always 10 kohms or higher NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR OK --> REPLACE MAIN BODY ECU
5. INSPECT FOG LIGHT RELAY (FR FOG) Remove the FR FOG relay from the engine room relay block, junction block. Measure the resistance according to the value(s) in the table below. Standard Resistance Tester Connection Condition Specified Condition 3 - 5 Battery voltage not applied to terminals 1 and 2 10 kohms or higher Battery voltage applied to terminals 1 and 2 Below 1 ohms NG --> REPLACE FOG LIGHT RELAY (FR FOG) OK: Go to next step
6. CHECK HARNESS AND CONNECTOR (FR FOG RELAY - BATTERY) Remove the FR FOG relay from the engine room relay block. Measure the voltage according to the value(s) in the table below. Standard Voltage Tester Connection Condition Specified Condition FR FOG relay terminal 2 - Body ground Light control switch tail 11 to 14 V FR FOG relay terminal 5 - Body ground Always NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR OK: Go to next step
7. CHECK HARNESS AND CONNECTOR (FOG LIGHT - FR FOG RELAY AND BODY GROUND) Remove the FR FOG relay from the engine room relay block. Disconnect the B1 and B2 light connectors. Measure the resistance according to the value(s) in the table below. Standard Resistance for LH for RH Tester Connection Condition Specified Condition FR FOG relay terminal 3 - B1-1 Always Below 1 ohms B1-2 - Body ground B1-1 - Body ground Always 10 kohms or higher Tester Connection Condition Specified Condition FR FOG relay terminal 3 - B2-1 Always Below 1 ohms B2-2 - Body ground B2-1 - Body ground Always 10 kohms or higher NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR OK: Go to next step
8. CHECK FRONT FOG LIGHT Disconnect the E1 ECU connector. Using a service wire, connect terminal E1-4 (FFGO) on the wire harness side and the body ground. Check that the front fog light illuminates. OK Front fog light illuminates. NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR (FOG LIGHT RELAY - MAIN BODY ECU) OK --> REPLACE MAIN BODY ECU
9. REPLACE HEADLIGHT DIMMER SWITCH. Refer to «REMOVAL»

Scheme 155

The turn signal flasher receives a turn signal switch signal from the headlight dimmer switch, and illuminates the front turn signal light and rear combination light.

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1. CHECK SWITCH FUNCTION Check if the hazard warning switch and headlight dimmer switch operate normally. RESULT Result Proceed to Hazard warning switch and Headlight dimmer switch do not operate A Only headlight dimmer switch does not operate B Only hazard warning switch does not operate (w/ Navigation) C Only hazard warning switch does not operate (w/o Navigation) D D --> See step 10 C --> See step 8 B --> See step 6 A: Go to next step
2. CHECK HARNESS AND CONNECTOR (TURN SIGNAL FLASHER - BATTERY AND BODY GROUND) Disconnect the turn signal flasher connector. Measure the resistance and voltage according to the value(s) in the table below. Standard Resistance Tester Connection Condition Specified Condition E19-7 (E) - Body ground Always Below 1 ohms Standard Voltage Tester Connection Switch Condition Specified Condition E19-1 (IG) - Body ground Engine switch on (IG) 11 to 14 V E19-4 (B) - Body ground Always 11 to 14 V NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR OK: Go to next step
3. CHECK TURN SIGNAL LIGHT FUNCTION Check the malfunctioning turn signal light. RESULT Result Proceed to LH A RH B B --> See step 5 A: Go to next step
4. CHECK HARNESS AND CONNECTOR (REAR COMBINATION LIGHT - TURN SIGNAL FLASHER AND BODY GROUND) Disconnect the E19 turn signal flasher connector. Disconnect the A41 and K4 light connectors. Measure the resistance according to the value(s) in the table below. Standard Resistance Tester Connection Condition Specified Condition A41-2 (B) - E19-3 (LL) Always Below 1 ohms A41-1 (E) - Body ground K4-4 (TRN) - E19-3 (LL) K4-3 (E) - Body ground K4-4 (TRN) - Body ground Always 10 kohms or higher A41-2 (B) - Body ground RESULT Result Proceed to OK (Headlight does not flash) A OK (Rear combination light does not flash) B NG C C --> REPAIR OR REPLACE HARNESS OR CONNECTOR B --> See step 14 A --> See step 13
5. CHECK HARNESS AND CONNECTOR (FRONT TURN SIGNAL LIGHT - TURN SIGNAL FLASHER AND BODY GROUND) Disconnect the E19 turn signal flasher connector. Disconnect the A47 and L3 light connectors. Measure the resistance according to the value(s) in the table below. Standard Resistance Tester Connection Condition Specified Condition A47-2 (B) - E19-2 (LR) Always Below 1 ohms A47-1 (E) - Body ground L3-4 (TRN) - E19-2 (LR) L3-3 (E) - Body ground L3-4 (TRN) - Body ground Always 10 kohms or higher A47-2 (B) - Body ground RESULT Result Proceed to OK (Headlight does not flash) A OK (Rear combination light does not flash) B NG C C --> REPAIR OR REPLACE HARNESS OR CONNECTOR B --> See step 14 A --> See step 13
6. INSPECT HEADLIGHT DIMMER SWITCH (TURN SIGNAL SWITCH) Remove the headlight dimmer switch. Refer to «INSPECTION». Measure the resistance according to the value(s) in the table below. Standard Resistance Tester Connection Switch Condition Specified Condition 13 (TR) - 12 (EL) Turn signal switch right turn Below 1 ohms Turn signal switch off 10 kohms or higher 15 (TL) - 12 (EL) Turn signal switch left turn Below 1 ohms Turn signal switch off 10 kohms or higher NG --> See step 12 OK: Go to next step
7. CHECK HARNESS AND CONNECTOR (HEADLIGHT DIMMER SWITCH - TURN SIGNAL FLASHER AND BODY GROUND) Disconnect the E14 switch connector. Disconnect the E19 turn signal flasher connector. Measure the resistance according to the value(s) in the table below. Standard Resistance Tester Connection Condition Specified Condition E14-13 (TR) - E19-6 (ER) Always Below 1 ohms E14-15 (TL) - E19-5 (EL) E14-12 (EL) - Body ground E14-13 (TR) - Body ground Always 10 kohms or higher E14-15 (TL) - Body ground NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR OK --> See step 17
8. CHECK HARNESS AND CONNECTOR (TURN SIGNAL FLASHER - DISPLAY AND NAVIGATION MODULE DISPLAY) Disconnect the E19 turn signal flasher connector. Disconnect the F28 display and navigation module display connector. Measure the resistance according to the value(s) in the table below. Standard Resistance Tester Connection Condition Specified Condition F28-8 (HAZ) - E19-8 (HAZ) Always Below 1 ohms F28-8 (HAZ) - body ground Always 10 kohms or higher NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR OK: Go to next step
9. CHECK DISPLAY AND NAVIGATION MODULE DISPLAY (HAZARD WARNING SWITCH) Temporarily replace the display and navigation module display with a new or normally functioning one. Refer to «REMOVAL - Step 5»(/lexus/lx/j200-2007-2012/remont/navigation-system/#navigation-service-information) . Check the hazard warning switch operation. OK Hazard warning switch operation is normal. NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR OK --> See step 15
10. CHECK HARNESS AND CONNECTOR (TURN SIGNAL FLASHER - MULTI-DISPLAY) Disconnect the E19 turn signal flasher connector. Disconnect the F28 multi-display connector. Measure the resistance according to the value(s) in the table below. Standard Resistance Tester Connection Condition Specified Condition F28-8 (HAZ) - E19-8 (HAZ) Always Below 1 ohms F28-8 (HAZ) - body ground Always 10 kohms or higher NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR OK: Go to next step
11. CHECK MULTI-DISPLAY (HAZARD WARNING SWITCH) Temporarily replace the multi-display with a new or normally functioning one. Refer to «REMOVAL - Step 5»(/lexus/lx/j200-2007-2012/remont/entertainment-systems/#audio-video-multi-display-service-information) . Check the hazard warning switch operation. OK Hazard warning switch operation is normal. NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR OK --> See step 16
12. REPLACE HEADLIGHT DIMMER SWITCH. Refer to «REMOVAL - Step 3»
13. REPLACE HEADLIGHT ASSEMBLY. Refer to «REMOVAL»
14. REPLACE REAR COMBINATION LIGHT. Refer to «REMOVAL - Step 1»
15. END (REPLACE DISPLAY & NAVIGATION MODULE DISPLAY). Refer to «REMOVAL»(/lexus/lx/j200-2007-2012/remont/navigation-system/#navigation-service-information)
16. END (REPLACE MULTI-DISPLAY). Refer to «REMOVAL - Step 5»(/lexus/lx/j200-2007-2012/remont/entertainment-systems/#audio-video-multi-display-service-information)
17. REPLACE TURN SIGNAL FLASHER ASSEMBLY. Refer to «REMOVAL»

The park/neutral position switch turns on when the shift lever is moved to R, causing the back-up lights to illuminate.

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1. INSPECT PARK/NEUTRAL POSITION SWITCH Remove the park/neutral position switch. Refer to «INSPECTION». Measure the resistance according to the value(s) in the table below. Standard Resistance Tester Connection Condition Specified Connection 2 (RB) - 1 (RL) Shift lever in R Below 1 ohms 2 (RB) - 1 (RL) Shift lever not in R 10 kohms or higher NG --> See step 4 OK: Go to next step
2. CHECK HARNESS AND CONNECTOR (PARK/NEUTRAL POSITION SWITCH - BATTERY) Disconnect the C19 switch connector. Measure the voltage according to the value(s) in the table below. Standard Voltage Tester Connection Switch Condition Specified Condition C19-2 (RB) - Body ground Engine switch on (IG) 11 to 14 V NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR OK: Go to next step
3. CHECK HARNESS AND CONNECTOR (BACK-UP LIGHT - PARK/NEUTRAL POSITION SWITCH AND BODY GROUND) Disconnect the C19 switch connector. Disconnect the f4 and f5 light connectors. Measure the resistance according to the value(s) in the table below. Standard Resistance for LH for LH Tester Connection Condition Specified Condition C19-1 (RL) - f5-1 Always Below 1 ohms f5-2 - Body ground f5-1 - Body ground Always 10 kohms or higher Tester Connection Condition Specified Condition C19-1 (RL) - f4-1 Always Below 1 ohms f4-2 - Body ground f4-1 - Body ground Always 10 kohms or higher NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR OK --> See step 5
4. REPLACE PARK/NEUTRAL POSITION SWITCH. Refer to «REMOVAL - Step 3»
5. REPLACE BACK-UP LIGHT. Refer to «REMOVAL»

When the stop light switch is turned on, current flows to the stop lights to illuminate them.

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1. READ VALUE USING TECHSTREAM (STOP LIGHT SWITCH) Using the Techstream, read the Data List. MAIN BODY Tester Display Measurement Item/Range Normal Condition Diagnostic Note Stop Light SW Stop light switch/ON or OFF ON: Brake pedal depressed OFF: Brake pedal released - OK On the Techstream screen, each item changes between ON and OFF according to above chart. NG --> See step 10 OK: Go to next step
2. CHECK HARNESS AND CONNECTOR (STOP LIGHT CONTROL RELAY - BATTERY AND BODY GROUND) Disconnect the A39 stop light relay connector. Measure the voltage according to the value(s) in the table below. Standard Voltage Tester Connection Condition Specified Condition A39-6 (+B) - Body ground Always 11 to 14 V Measure the resistance according to the value(s) in the table below. Standard Resistance Tester Connection Condition Specified Condition A39-4 (GND) - Body ground Always Below 1 ohms NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR OK: Go to next step
3. CHECK HARNESS AND CONNECTOR (STOP LIGHT CONTROL RELAY - STOP LIGHT SWITCH) Disconnect the A30 stop light switch connector. Disconnect the A39 relay connector. Measure the resistance according to the value(s) in the table below. Standard Resistance Tester Connection Condition Specified Condition A30-1 - A39-2 (STP) Always Below 1 ohms A30-1 - Body ground Always 10 kohms or higher NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR OK: Go to next step
4. INSPECT BRAKE LIGHT RELAY (BRK LP) Remove the brake light relay from the engine room relay block. Measure the resistance according to the value(s) in the table below. Standard Resistance Tester Connection Condition Specified Condition 3 - 5 Battery voltage not applied to terminals 1 and 2 10 kohms or higher Battery voltage applied to terminals 1 and 2 Below 1 ohms 3 - 4 Battery voltage not applied to terminals 1 and 2 Below 1 ohms Battery voltage applied to terminals 1 and 2 10 kohms or higher NG --> REPLACE BRAKE LIGHT RELAY OK: Go to next step
5. CHECK HARNESS AND CONNECTOR (STOP LIGHT CONTROL RELAY - BRAKE LIGHT RELAY) Remove the brake light relay from the engine room relay block. Disconnect the A39 stop light control relay connector. Measure the voltage according to the value(s) in the table below. Standard Voltage Tester Connection Condition Specified Condition A39-6 (+B) - Body ground Always 11 to 14 V Measure the resistance according to the value(s) in the table below. Standard Resistance Tester Connection Condition Specified Condition A39-8 (OUT) - Brake light relay terminal 4 Always Below 1 ohms A39-8 (OUT) - Body ground Always 10 kohms or higher NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR OK: Go to next step
6. CHECK HARNESS AND CONNECTOR (BRAKE LIGHT RELAY - STOP LIGHT AND BODY GROUND) Remove the brake light relay from the engine room relay block. Rear Combination Light: Disconnect the K4 and L3 light connectors. Measure the resistance according to the value(s) in the table below. Standard Resistance for LH for RH Tester Connection Condition Specified Condition Brake light relay terminal 3 - K4-5 (STP) Always Below 1 ohms K4-3 (E) - Body ground K4-5 (STP) - Body ground Always 10 kohms or higher Tester Connection Condition Specified Condition Brake light relay terminal 3 - L3-5 (STP) Always Below 1 ohms L3-3 (E) - Body ground L3-5 (STP) - Body ground Always 10 kohms or higher High Mount Stop Light: Disconnect the S4 light connector. Measure the resistance according to the value(s) in the table below. Standard Resistance Tester Connection Condition Specified Condition Brake light relay terminal 3 - S4-1 (B) Always Below 1 ohms S4-2 (E) - Body ground S4-1 (B) - Body ground Always 10 kohms or higher NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR OK: Go to next step
7. CHECK HARNESS AND CONNECTOR (BRAKE LIGHT RELAY - BATTERY) Remove the brake light relay from the engine room relay block. Measure the voltage according to the value(s) in the table below. Standard Voltage Tester Connection Switch Condition Specified Condition Brake light relay terminal 1 - Body ground Engine switch on (IG) 11 to 14 V Engine switch off Below 1 V Brake light relay terminal 5 - Body ground Always 11 to 14 V NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR OK: Go to next step
8. CHECK HARNESS AND CONNECTOR (BRAKE LIGHT RELAY - SKID CONTROL ECU) Remove the brake light relay from the engine room relay block. Disconnect the A24 ECU connector. Measure the resistance according to the value(s) in the table below. Standard Resistance Tester Connection Condition Specified Condition Brake light relay terminal 2 - A24-16 (STP0) Always Below 1 ohms Brake light relay terminal 2 - Body ground Always 10 kohms or higher NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR OK: Go to next step
9. CHECK STOP LIGHT CONTROL RELAY Temporarily replace the stop light control relay with a new or normally functioning one. Refer to «ON-VEHICLE INSPECTION». Check the stop light operation. OK Stop light operation is normal. NG --> See step 14 OK --> See step 13
10. INSPECT STOP LIGHT SWITCH Remove the stop light switch. Refer to «INSPECTION». Measure the resistance according to the value(s) in the table below. Standard Resistance Tester Connection Switch Condition Specified Condition 1 - 2 Switch pin released Below 1 ohms 1 - 2 Switch pin pushed in 10 kohms or higher NG --> See step 15 OK: Go to next step
11. CHECK HARNESS AND CONNECTOR (STOP LIGHT SWITCH - BATTERY) Disconnect the A30 stop light switch connector. Measure the voltage according to the value(s) in the table below. Standard Voltage Tester Connection Condition Specified Condition A30-2 - Body ground Always 11 to 14 V NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR OK: Go to next step
12. CHECK HARNESS AND CONNECTOR (MAIN BODY ECU - STOP LIGHT SWITCH) Disconnect the A30 stop light switch connector. Disconnect the 2B ECU connector. Measure the resistance according to the value(s) in the table below. Standard Resistance Tester Connection Condition Specified Condition A30-1 - 2B-22 (STP) Always Below 1 ohms A30-1 - Body ground Always 10 kohms or higher NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR OK --> REPLACE MAIN BODY ECU
13. REPLACE STOP LIGHT CONTROL RELAY. Refer to «ON-VEHICLE INSPECTION»
14. REPLACE MASTER CYLINDER SOLENOID (SKID CONTROL ECU). Refer to «REMOVAL - Step 9»
15. REPLACE STOP LIGHT SWITCH. Refer to «REMOVAL - Step 1»

See also:
• REMOVAL - Step 5
• REMOVAL - Step 5