Lighting System (Interior) (Diagnostics & Circuit Tests): Overview Lexus GX J150

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SYSTEM DESCRIPTION

1. ILLUMINATION CONTROL SYSTEM (Illuminated Entry System) The illuminated entry system has the following control functions: Control Outline Lighting Actuation Area-linked When a registered key enters any actuation area around the doors, the lights that operate turn on. Engine switch illumination Map light assembly No. 1 room light assembly No. 2 room light assembly Side step light Door Lock/Unlock-linked When any door is unlocked, the lights that operate turn on. Engine switch illumination Map light assembly No. 1 room light assembly No. 2 room light assembly Side step light Interior foot lights Inside handle illumination When all doors are locked, the lights that operate turn off. Door Open/Close-linked When any door is opened, the lights that operate turn on. Engine switch illumination Map light assembly No. 1 room light assembly No. 2 room light assembly Side step light Interior foot lights Inside handle illumination Door courtesy lights When all doors are closed, the lights that operate turn off. Engine Switch-linked When the engine switch is turned from on (ACC or IG) to off, the lights that operate turn on. Engine switch illumination Map light assembly No. 1 room light assembly No. 2 room light assembly When the engine switch is turned from off to on (ACC or ON), the lights that operate turn on. Center console spot light Battery Saving When the doors remain in the same condition for 20 minutes and the key is outside the vehicle exterior detection area, the illumination of the items listed to the right turns off. Engine switch illumination Map light assembly No. 1 room light assembly No. 2 room light assembly Side step light Interior foot lights Inside handle illumination

OPERATION CHECK

1. INSPECT ILLUMINATED ENTRY SYSTEM OPERATION *: When the lights are on, if the key leaves all detection areas around the doors, after approximately 3 seconds, the lights fade out. NOTE: Perform this inspection with the customizable parameters set to the initial settings. HINT: The illuminated entry system illuminates the lights below. Engine switch illumination Map light No. 1 room light No. 2 room light Side step light Interior foot lights Inside handle illumination The operation and conditions of this system are described below. Operation Condition Lights fade in and illuminate constantly Any door is opened when all the doors are closed. Lights illuminate for 15 seconds, and then fade out When any of the following conditions is met: The key is brought within any vehicle exterior detection area when the engine switch is off and all the doors are closed.* Any door is unlocked when the engine switch is off and all the doors are closed and locked. The engine switch is turned from on (ACC) to off when all doors are closed. All the doors are closed when one or more doors are open and the engine switch is off. Lights fade out immediately When either of the following conditions is met: The engine switch is turned from off to on (ACC) when all the doors are closed. All the doors are locked when the engine switch is off, all the doors are closed and any door is unlocked. Battery saving The doors remain in the same condition for 20 minutes and the key is outside the vehicle exterior detection area.
2. INSPECT CENTER CONSOLE SPOT LIGHT CONTROL OPERATION NOTE: Perform this inspection with the customizable parameters set to the initial settings. The operation and conditions of this function are described below. Operation Condition Light fades in When either of the following conditions is met, the center console spot light fades in. Engine switch on (ACC) Engine switch on (IG) Light fades out Engine switch off

DESCRIPTION

This circuit detects the engine switch state [on (IG) or off] and sends it to the main body ECU.

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This circuit detects the engine switch state [on (ACC) or off] and sends it to the main body ECU.

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The main body ECU receives a door open/closed signal from each door courtesy light switch.

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1. READ VALUE USING TECHSTREAM (DOOR COURTESY LIGHT SWITCH) Using the Techstream, read the Data List. Refer to «DATA LIST / ACTIVE TEST»(ref-524117-S05459243362013012800000) . MAIN BODY Tester Display Measurement Item/Range Normal Condition Diagnostic Note RR Door Courtesy SW Rear door courtesy light switch RH signal / ON or OFF ON: Rear door RH open OFF: Rear door RH closed - RL Door Courtesy SW Rear door courtesy light switch LH signal / ON or OFF ON: Rear door LH open OFF: Rear door LH closed - FR Door Courtesy Front door courtesy light switch RH signal / ON or OFF ON: Front door RH open OFF: Front door RH closed - FL Door Courtesy Front door courtesy light switch LH signal / ON or OFF ON: Front door LH open OFF: Front door LH closed - OK The display is as specified in the normal condition column. RESULT Result Proceed to OK A NG (Front door courtesy light switch does not operate) B NG (Rear door courtesy light switch does not operate) C B --> See step 2 C --> See step 4 A --> See step 7
2. INSPECT FRONT DOOR COURTESY LIGHT SWITCH ASSEMBLY Remove the front door courtesy light switch. Refer to «REMOVAL»(ref-524299-S22909965472013012800000) . Measure the resistance according to the value(s) in the table below. Standard Resistance Tester Connection Switch Condition Specified Condition 1 - Switch body Pin not pushed Below 1 ohms Pin pushed 10 kohms or higher NG --> See step 6 OK: Go to next step
3. CHECK HARNESS AND CONNECTOR (MAIN BODY ECU - FRONT DOOR COURTESY LIGHT SWITCH ASSEMBLY) Remove the main body ECU. Refer to «REMOVAL»(ref-524305-S41918141882013012800000) . Disconnect the R9*1 or Q8*2 front door courtesy light switch connector. *1: for LH *2: for RH Measure the resistance according to the value(s) in the table below. Standard Resistance for LH for RH Tester Connection Condition Specified Condition A-2 (FLCY) - R9-1 Always Below 1 ohms A-2 (FLCY) - Body ground Always 10 kohms or higher Tester Connection Condition Specified Condition A-4 (FRCY) - Q8-1 Always Below 1 ohms A-4 (FRCY) - Body ground Always 10 kohms or higher NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR OK --> See step 8
4. INSPECT REAR DOOR COURTESY LIGHT SWITCH ASSEMBLY Remove the rear door courtesy light switch. Refer to «REMOVAL»(ref-524299-S15741257132013012800000) . Measure the resistance according to the value(s) in the table below. Standard Resistance Tester Connection Switch Condition Specified Condition 1 - Switch body Pin not pushed Below 1 ohms Pin pushed 10 kohms or higher NG --> See step 9 OK: Go to next step
5. CHECK HARNESS AND CONNECTOR (MAIN BODY ECU - REAR DOOR COURTESY LIGHT SWITCH ASSEMBLY) *1: for LH *2: for RH Disconnect the G48*1 or G47*2 main body ECU connector. Disconnect the R10*1 or Q9*2 rear door courtesy light switch connector. Measure the resistance according to the value(s) in the table below. Standard Resistance for LH for RH Tester Connection Condition Specified Condition G48-3 (LCTY) - R10-1 Always Below 1 ohms G48-3 (LCTY) - Body ground Always 10 kohms or higher Tester Connection Condition Specified Condition G47-6 (RCTY) - Q9-1 Always Below 1 ohms G47-6 (RCTY) - Body ground Always 10 kohms or higher NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR OK --> See step 8
6. REPLACE FRONT DOOR COURTESY LIGHT SWITCH ASSEMBLY. Refer to «REMOVAL»(ref-524299-S22909965472013012800000)
7. PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE. Refer to «PROBLEM SYMPTOMS TABLE»(ref-524117-S32649894882013012800000)
8. REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU). Refer to «REMOVAL»(ref-524305-S41918141882013012800000)
9. REPLACE REAR DOOR COURTESY LIGHT SWITCH ASSEMBLY. Refer to «REMOVAL»(ref-524299-S15741257132013012800000)

The main body ECU receives a door open/closed signal from each door courtesy light switch.

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1. READ VALUE USING TECHSTREAM (DOOR COURTESY LIGHT SWITCH) Using the Techstream, read the Data List. Refer to «DATA LIST / ACTIVE TEST»(ref-524117-S05459243362013012800000) . MAIN BODY Tester Display Measurement Item/Range Normal Condition Diagnostic Note Back Door Courtesy SW Back door courtesy switch signal / ON or OFF ON: Back door open OFF: Back door closed - Glass Hatch Courtesy Switch Glass hatch courtesy switch signal / ON or OFF ON: Glass hatch open OFF: Glass hatch closed - OK The display is as specified in the normal condition column. RESULT Result Proceed to OK A NG (Back door courtesy light switch does not operate) B NG (Glass hatch courtesy light switch does not operate) C B --> See step 2 C --> See step 4 A --> See step 8
2. INSPECT BACK DOOR COURTESY LIGHT SWITCH ASSEMBLY Remove the back door courtesy light switch. Refer to «REMOVAL»(ref-524299-S14533493432013012800000) . Measure the resistance according to the value(s) in the table below. Standard Resistance Tester Connection Switch Condition Specified Condition 1 - Switch body Pin not pushed Below 1 ohms Pin pushed 10 kohms or higher NG --> See step 7 OK: Go to next step
3. CHECK HARNESS AND CONNECTOR (MAIN BODY ECU - BACK DOOR COURTESY LIGHT SWITCH ASSEMBLY) Disconnect the G47 main body ECU connector. Disconnect the R11 back door courtesy light switch connector. Measure the resistance according to the value(s) in the table below. Standard Resistance Tester Connection Condition Specified Condition G47-19 (BCTY) - R11-1 Always Below 1 ohms G47-19 (BCTY) - Body ground Always 10 kohms or higher NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR OK --> See step 6
4. INSPECT BACK WINDOW LOCK ASSEMBLY (GLASS HATCH COURTESY LIGHT SWITCH) Remove the back window lock. Refer to «REMOVAL»(ref-524356-S13382209702013012800000) . TEXT IN ILLUSTRATION Open - - Measure the resistance according to the value(s) in the table below. Standard Resistance Tester Connection Condition Specified Condition 1 (-) - 2 (+) Open Below 1 ohms Closed 10 kohms or higher NG --> See step 9 OK: Go to next step
5. CHECK HARNESS AND CONNECTOR (MAIN BODY ECU - BACK WINDOW LOCK ASSEMBLY AND BODY GROUND) Disconnect the G47 main body ECU connector. Disconnect the X4 back window lock connector. Measure the resistance according to the value(s) in the table below. Standard Resistance Tester Connection Condition Specified Condition G47-1 (GCTY) - X4-2 (+) Always Below 1 ohms G47-1 (GCTY) - Body ground Always 10 kohms or higher X4-1 (-) - Body ground Always Below 1 ohms NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR OK --> See step 6
6. REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU). Refer to «REMOVAL»(ref-524305-S41918141882013012800000)
7. REPLACE BACK DOOR COURTESY LIGHT SWITCH ASSEMBLY. Refer to «REMOVAL»(ref-524299-S14533493432013012800000)
8. PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE. Refer to «PROBLEM SYMPTOMS TABLE»(ref-524117-S32649894882013012800000)
9. REPLACE BACK WINDOW LOCK ASSEMBLY. Refer to «REMOVAL»(ref-524356-S13382209702013012800000)

The main body ECU controls the center console spot light.

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