Lighting (Interior) (Diagnostics): Overview

SYSTEM DESCRIPTION

ILLUMINATED ENTRY SYSTEM The illuminated entry system has the following control functions: Control Outline Lights that Operate Actuation Area-linked When a registered key enters any actuation area around the doors, the lights that operate turn on*1. Engine Switch Illumination Front Interior Lights Rear Interior Light Footwell Lights Scuff Plate Lights When a registered key leaves all of actuation areas around the doors, the lights that operate turn off. Engine Switch Illumination Front Interior Lights Rear Interior Light Footwell Lights Scuff Plate Lights Door Lock/Unlock-linked When any door is unlocked, the lights that operate turn on*1. Engine Switch Illumination Front Interior Lights Rear Interior Light Footwell Lights Scuff Plate Lights Courtesy Lights When all doors are locked, the lights that operate turn off. Engine Switch Illumination Front Interior Lights Rear Interior Light Footwell Lights Scuff Plate Lights Courtesy Lights Door Open/Close-linked When any door is opened, the lights that operate turn on. Engine Switch Illumination Front Interior Lights Rear Interior Light Footwell Lights Scuff Plate Lights 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*1. Engine Switch Illumination Front Interior Lights Rear Interior Light Footwell Lights Scuff Plate Lights When the engine switch is turned from off to on (ACC or IG) the light that operate turn off. Engine Switch Illumination Front Interior Lights Rear Interior Light Footwell Lights Scuff Plate Lights When the engine switch is turned from off to on (ACC or IG) the light that operate turn on. Center Console Spot Light When the engine switch is turned from on (ACC or IG) to off the light that operate turn off. Center Console Spot Light Delay When approximately 15 seconds elapse after any of the following conditions are met, the lights that operate turn off. An actuation area-linked function is used. The door unlock-linked function is active. Any doors is opened and then all doors are closed when the engine switch off. Engine Switch Illumination Front Interior Lights Rear Interior Light Footwell Lights Scuff Plate Lights Battery Saving When no changes occur in the condition of the doors for 20 minutes and a key is not in the actuation area, these lights turn off. Engine Switch Illumination Front Interior Lights Rear Interior Light Footwell Lights Scuff Plate Lights Courtesy Lights HINT: *1: The lights turn on with light adjustment state.

OPERATION CHECK

INSPECT ILLUMINATED ENTRY SYSTEM OPERATION NOTE: Perform this inspection with the customize parameter at the initial setting. HINT: The illuminated entry system illuminates the lights below. Engine Switch Illumination Front Interior Lights Rear Interior Light Footwell Lights Scuff Plate Lights The operation and condition of this control are described below. Operation Condition Fade in and illuminate constantly Any door is opened when all doors are closed. Illuminate for 15 seconds, and then fade out When any of the following conditions is met, the lights illuminate for 15 seconds, and then fade out. The key enters any actuation area around the doors when the engine switch is off and all doors are closed*1. Any door is unlocked when the engine switch is off, all doors are closed and locked. The engine switch is turned from on (ACC) to off when all doors are closed. All doors are closed when any door is opened and the engine switch is off. Fade out immediately When any of the following conditions is met, the lights fade out immediately. The engine switch is turned from off to on (ACC) when all doors are closed. All doors are locked when the engine switch is off, all doors are closed and any door is unlocked. All doors are locked again when all doors are closed and locked. Battery saver When no changes occur in the condition of the doors for 20 minutes and a key is not in the actuation area, these lights turn off. HINT: *1: When the lights are on, if the key leaves all of actuation areas around the doors, after approximately 3 seconds, the lights fade out.
INSPECT CENTER CONSOLE SPOT LIGHT CONTROL OPERATION NOTE: Perform this inspection with the customize parameter at the initial settings. HINT: The center console spot light control illuminates the light below. Center console spot light The operation and condition of this control are described below. Operation Condition Fade in When either of the following conditions is met, the center console spot light fades in. The engine switch is on (ACC) The engine switch is on (IG) Fade out The engine switch is off

DESCRIPTION

This circuit detects the engine switch on (IG) or off condition, and sends it to the main body ECU (multiplex network body ECU).

Scheme 6

Scheme 6: WIRING DIAGRAM

This circuit detects the engine switch on (IG) or off condition, and sends it to the main body ECU (multiplex network body ECU).

This circuit detects the engine switch on (ACC) or off condition, and sends it to the main body ECU (multiplex network body ECU).

Scheme 7

Scheme 7: WIRING DIAGRAM

This circuit detects the engine switch on (ACC) or off condition, and sends it to the main body ECU (multiplex network body ECU).

The main body ECU (multiplex network body ECU) detects the condition of the door courtesy light switch.

Scheme 8

Scheme 8: WIRING DIAGRAM

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Scheme 9: PROCEDURE

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READ VALUE USING TECHSTREAM Connect the Techstream to the DLC3. Turn the engine switch on (IG). Turn the Techstream on. Enter the following menus: Body Electrical / Main Body or Back Door / Data List. Read the display on the Techstream. MAIN BODY Tester Display Measurement Item/Range Normal Condition Diagnostic Note FL Door Courtesy Front door courtesy light switch LH signal/ON or OFF ON: Front door LH open OFF: Front 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 - 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 - Back Door Courtesy SW Back door courtesy switch signal/ON or OFF ON: Back door open OFF: Back door closed - BACK DOOR (W/ POWER BACK DOOR) Tester Display Measurement Item/Range Normal Condition Diagnostic Note Courtesy SW Back door Courtesy switch signal/ON or OFF ON: Back door open OFF: Back door closed - OK Normal conditions listed above are displayed. Result Result Proceed to OK A Front door courtesy light switch LH or RH does not operate B Rear door courtesy light switch LH or RH does not operate C Back door courtesy switch does not operate D D --> See step 7 C --> See step 5 B --> See step 2 A --> See step 12
INSPECT FRONT DOOR COURTESY LIGHT SWITCH ASSEMBLY (LH OR RH) Remove the front door courtesy light switch assembly. Refer to «REMOVAL»(/lexus/rx/iii-2008-2012/remont/interiorillumination-lights/#lighting-interior-service-information) . Measure the resistance according to the value(s) in the table below. Standard Resistance Tester Connection Switch Condition Specified Condition 1 - Switch body Pushed 10 kohms or higher 1 - Switch body Not pushed Below 1 ohms TEXT IN ILLUSTRATION *1 Component without harness connected (Front Door Courtesy Light Switch Assembly) *2 Switch Body NG --> See step 9 OK: Go to next step
CHECK HARNESS AND CONNECTOR (INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY - SWITCH) for Front LH Disconnect the 2H instrument panel junction block assembly connector. Disconnect the P3 front door courtesy light switch assembly connector. Measure the resistance according to the value(s) in the table below. Standard Resistance Tester Connection Condition Specified Condition 2H-26 - P3-1 Always Below 1 ohms 2H-26 - Body ground Always 10 kohms or higher TEXT IN ILLUSTRATION *1 Front view of wire harness connector (to Instrument Panel Junction Block Assembly) *2 Front view of wire harness connector (to Front Door Courtesy Light Switch Assembly) for Front RH Disconnect the 2D instrument panel junction block assembly connector. Disconnect the O4 front door courtesy light switch assembly connector. Measure the resistance according to the value(s) in the table below. Standard Resistance Tester Connection Condition Specified Condition 2D-26 - O4-1 Always Below 1 ohms 2D-26 - Body ground Always 10 kohms or higher TEXT IN ILLUSTRATION *1 Front view of wire harness connector (to Instrument Panel Junction Block Assembly) *2 Front view of wire harness connector (to Front Door Courtesy Light Switch Assembly) NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR OK: Go to next step
INSPECT INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY for Front LH Remove the instrument panel junction block assembly. Measure the resistance according to the value(s) in the table below. Standard Resistance Tester Connection Condition Specified Condition 2H-26 - A-2 (FLCY) Always Below 1 ohms 2H-26 - Body ground Always 10 kohms or higher TEXT IN ILLUSTRATION *1 Component without harness connected (Instrument Panel Junction Block Assembly) for Front RH Remove the instrument panel junction block assembly. Measure the resistance according to the value(s) in the table below. Standard Resistance Tester Connection Condition Specified Condition 2D-26 - A-4 (FRCY) Always Below 1 ohms 2D-26 - Body ground Always 10 kohms or higher TEXT IN ILLUSTRATION *1 Component without harness connected (Instrument Panel Junction Block Assembly) NG --> REPLACE INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY OK --> See step 13
INSPECT REAR DOOR COURTESY LIGHT SWITCH ASSEMBLY (LH OR RH) Remove the rear door courtesy light switch assembly. Refer to «REMOVAL (TO 8/2009)»(/lexus/rx/iii-2008-2012/remont/interiorillumination-lights/#lighting-interior-service-information) . Measure the resistance according to the value(s) in the table below. Standard Resistance Tester Connection Switch Condition Specified Condition 1 - Switch body Pushed 10 kohms or higher 1 - Switch body Not pushed Below 1 ohms TEXT IN ILLUSTRATION *1 Component without harness connected (Rear Door Courtesy Light Switch Assembly) *2 Switch Body NG --> See step 10 OK: Go to next step
CHECK HARNESS AND CONNECTOR (MAIN BODY ECU - REAR COURTESY LIGHT SWITCH) for Rear LH Disconnect the F12 main body ECU (multiplex network body ECU) connector. Disconnect the P13 rear door courtesy light switch assembly connector. Measure the resistance according to the value(s) in the table below. Standard Resistance Tester Connection Condition Specified Condition F12-3 (LCTY) - P13-1 Always Below 1 ohms F12-3 (LCTY) - Body ground Always 10 kohms or higher TEXT IN ILLUSTRATION *1 Front view of wire harness connector (to Main Body ECU (Multiplex Network Body ECU)) *2 Front view of wire harness connector (to Rear Door Courtesy Light Switch Assembly) for Rear RH Disconnect the F13 main body ECU (multiplex network body ECU) connector. Disconnect the O14 rear door courtesy light switch assembly connector. Measure the resistance according to the value(s) in the table below. Standard Resistance Tester Connection Condition Specified Condition F13-6 (RCTY) - O14-1 Always Below 1 ohms F13-6 (RCTY) - Body ground Always 10 kohms or higher TEXT IN ILLUSTRATION *1 Front view of wire harness connector (to Main Body ECU (Multiplex Network Body ECU)) *2 Front view of wire harness connector (to Rear Door Courtesy Light Switch Assembly) NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR OK --> See step 13
INSPECT BACK DOOR LOCK ASSEMBLY w/o Power Back Door Remove the back door lock assembly. Refer to «REMOVAL (TO 8/2009)». Measure the resistance according to the value(s) in the table below. Standard Resistance Tester Connection Switch Condition Specified Condition 1 - 3 Locked 10 kohms or higher 1 - 3 Unlocked Below 1 ohms TEXT IN ILLUSTRATION *1 Component without harness connected (Back Door Lock Assembly) *2 Lock *3 Unlock w/ Power Back Door Remove the back door lock assembly. Refer to «REMOVAL (TO 8/2009)». Measure the resistance according to the value(s) in the table below. Standard Resistance Tester Connection Condition Specified Condition 8 (CTY) - 7 (E) Open-latch Below 1 ohms 8 (CTY) - 7 (E) Half-latch Below 1 ohms 8 (CTY) - 7 (E) Full-latch 10 kohms or higher 8 (CTY) - 7 (E) Over-latch 10 kohms or higher NG --> See step 11 OK: Go to next step
CHECK HARNESS AND CONNECTOR (BACK DOOR LOCK - MAIN BODY ECU OR POWER BACK DOOR UNIT) w/o Power Back Door Disconnect the F13 main body ECU (multiplex network body ECU) connector. Disconnect the Y9 back door lock assembly connector. Measure the resistance according to the value(s) in the table below. Standard Resistance Tester Connection Condition Specified Condition F13-19 (BCTY) - Y9-3 Always Below 1 ohms F13-19 (BCTY) - Body ground Always 10 kohms or higher Y9-1 - Body ground Always Below 1 ohms TEXT IN ILLUSTRATION *1 Front view of wire harness connector (to Main Body ECU (Multiplex Network Body ECU)) *2 Front view of wire harness connector (to Back Door Lock Assembly) w/ Power Back Door Disconnect the P33 power back door unit assembly connector. Disconnect the Y10 back door lock assembly connector. Measure the resistance according to the value(s) in the table below. Standard Resistance Tester Connection Condition Specified Condition P33-20 (FUL) - Y10-8 (CTY) Always Below 1 ohms P33-20 (FUL) - Body ground Always 10 kohms or higher Y10-7 (E) - Body ground Always Below 1 ohms TEXT IN ILLUSTRATION *1 Front view of wire harness connector (to Power Back Door Unit Assembly) *2 Front view of wire harness connector (to Back Door Lock Assembly) Result Result Proceed to OK (w/o Power Back Door) A OK (w/ Power Back Door) B NG C C --> REPAIR OR REPLACE HARNESS OR CONNECTOR B --> See step 14 A --> See step 13
REPLACE FRONT DOOR COURTESY LIGHT SWITCH ASSEMBLY. Refer to «REMOVAL (TO 8/2009)»(/lexus/rx/iii-2008-2012/remont/interiorillumination-lights/#lighting-interior-service-information)
REPLACE REAR DOOR COURTESY LIGHT SWITCH ASSEMBLY. Refer to «REMOVAL (TO 8/2009)»(/lexus/rx/iii-2008-2012/remont/interiorillumination-lights/#lighting-interior-service-information)
REPLACE BACK DOOR LOCK ASSEMBLY. Refer to «REMOVAL (TO 8/2009)»
PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE. Refer to «PROBLEM SYMPTOMS TABLE»
REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU). Refer to «REMOVAL (TO 8/2009)»
REPLACE POWER BACK DOOR UNIT ASSEMBLY. Refer to «REMOVAL (TO 08/2009)»

The main body ECU (multiplex network body ECU) detects the condition of the door courtesy light switch.

The main body ECU (multiplex network body ECU) receives the door courtesy light switch signal to control the courtesy light.

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Scheme 20: WIRING DIAGRAM

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Scheme 21: PROCEDURE

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CHECK OPERATION Check the operation of each courtesy light. Result Result Proceed to Front courtesy light LH does not comes on A Front courtesy light RH does not comes on B Rear courtesy light LH does not comes on C Rear courtesy light RH does not comes on D D --> See step 6 C --> See step 5 B --> See step 3 A: Go to next step
CHECK HARNESS AND CONNECTOR (BATTERY - MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU)) Disconnect the F12 main body ECU (multiplex network body ECU) connector. Measure the voltage according to the value(s) in the table below. Standard Voltage Tester Connection Condition Specified Condition F12-1 (FLCL) - Body ground Always 11 to 14 V TEXT IN ILLUSTRATION *1 Front view of wire harness connector (to Main Body ECU (Multiplex Network Body ECU)) NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR OK --> See step 7
CHECK HARNESS AND CONNECTOR (BATTERY - INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY) Disconnect the 2D instrument panel junction block assembly connector. Measure the voltage according to the value(s) in the table below. Standard Voltage Tester Connection Condition Specified Condition 2D-11 - Body ground Always 11 to 14 V TEXT IN ILLUSTRATION *1 Front view of wire harness connector (to Instrument Panel Junction Block Assembly) NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR OK: Go to next step
INSPECT INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY Remove the instrument panel junction block assembly. Measure the resistance according to the value(s) in the table below. Standard Resistance Tester Connection Condition Specified Condition 2D-11 - A-3 (FRCL) Always Below 1 ohms 2D-11 - Body ground Always 10 kohms or higher Check that the courtesy light comes on. OK Courtesy light comes on. TEXT IN ILLUSTRATION *1 Component without harness connected (Instrument Panel Junction Block Assembly) NG --> REPLACE INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY OK --> See step 7
CHECK HARNESS AND CONNECTOR (BATTERY - MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU)) Disconnect the F12 main body ECU (multiplex network body ECU) connector. Measure the voltage according to the value(s) in the table below. Standard Voltage Tester Connection Condition Specified Condition F12-4 (LCYL) - Body ground Always 11 to 14 V TEXT IN ILLUSTRATION *1 Front view of wire harness connector (to Main Body ECU (Multiplex Network Body ECU)) NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR OK --> See step 7
CHECK HARNESS AND CONNECTOR (BATTERY - MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU)) Disconnect the F14 main body ECU (multiplex network body ECU) connector. Measure the voltage according to the value(s) in the table below. Standard Voltage Tester Connection Condition Specified Condition F14-1 (RCYL) - Body ground Always 11 to 14 V TEXT IN ILLUSTRATION *1 Front view of wire harness connector (to Main Body ECU (Multiplex Network Body ECU)) NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR OK --> See step 7
PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE. Refer to «PROBLEM SYMPTOMS TABLE»

The main body ECU (multiplex network body ECU) receives the door courtesy light switch signal to control the courtesy light.

The illuminated entry system controls the interior lights, footwell lights and scuff plate lights.

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Scheme 26: WIRING DIAGRAM

Scheme 27

Scheme 27: PROCEDURE

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PERFORM ACTIVE TEST USING TECHSTREAM Connect the Techstream to the DLC3. Turn the engine switch on (IG). Turn the Techstream on. Enter the following menus: Body Electrical / Main Body / Active Test. Check that the lights operate. MAIN BODY Tester Display Test Part Control Range Diagnostic Note Illuminated Entry System Interior lights, footwell lights and scuff plate lights ON/OFF Interior light door switch on (not pushed), interior light on/off switch off (not pushed) and all doors closed OK Each light fades in. NG --> See step 2 OK --> See step 5
CHECK HARNESS AND CONNECTOR (BATTERY - INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY) Disconnect the 2D and 2H instrument panel junction block assembly. Measure the voltage according to the value(s) in the table below. Standard Voltage Tester Connection Condition Specified Condition 2D-12 - Body ground Always 11 to 14 V 2D-13 - Body ground Always 11 to 14 V 2H-23 - Body ground Always 11 to 14 V 2H-24 - Body ground Always 11 to 14 V TEXT IN ILLUSTRATION *1 Front view of wire harness connector (to Instrument Panel Junction Block Assembly) NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR OK: Go to next step
INSPECT INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY Remove the instrument panel junction block assembly. Measure the resistance according to the value(s) in the table below. Standard Resistance Tester Connection Condition Specified Condition 2D-12 - A-1 (ILE) Always Below 1 ohms 2D-13 - A-1 (ILE) Always Below 1 ohms 2H-23 - A-1 (ILE) Always Below 1 ohms 2H-24 - A-1 (ILE) Always Below 1 ohms A-1 (ILE) - Body ground Always 10 kohms or higher TEXT IN ILLUSTRATION *1 Component without harness connected (Instrument Panel Junction Block Assembly) NG --> REPLACE INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY OK --> See step 4
REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU). Refer to «REMOVAL (TO 8/2009)»
PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE. Refer to «PROBLEM SYMPTOMS TABLE»

The illuminated entry system controls the interior lights, footwell lights and scuff plate lights.

The main body ECU (multiplex network body ECU) detects the condition of the interior light door switch and interior light on/off switch.

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Scheme 29: WIRING DIAGRAM

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Scheme 30: PROCEDURE

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READ VALUE USING TECHSTREAM Connect the Techstream to the DLC3. Turn the engine switch on (IG). Turn the Techstream on. Enter the following menus: Body Electrical / Main Body / Data List. Read the display on the Techstream. BODY (MAIN BODY ECU RH) Tester Display Measurement Item/Range Normal Condition Diagnostic Note Dome Light DOOR SW Interior light door switch signal/ON or OFF ON: Interior light door switch not pushed OFF: Interior light door switch pushed - Dome Light SW Interior light on/off switch signal/ON or OFF ON: Interior light on/off switch pushed OFF: Interior light on/off switch not pushed - OK Switch condition can be displayed. Result Result Proceed to Interior light door switch does not operate A Interior light on/off switch does not operate B Both interior light door switch and on/off switch do not operate C OK D C --> See step 6 B --> See step 4 A --> See step 2 D --> See step 7
INSPECT MAP LIGHT ASSEMBLY Remove the map light assembly. Refer to «REMOVAL»(/lexus/rx/iii-2008-2012/remont/interiorillumination-lights/#lighting-interior-service-information) . Measure the resistance according to the value(s) in the table. Standard Resistance Tester Connection Condition Specified Condition 18 (DOOR) - 40 (GND) Interior light door switch pushed 10 kohms or higher Interior light door switch not pushed Below 1 ohms TEXT IN ILLUSTRATION *1 Component without harness connected: (Map Light Assembly) NG --> See step 8 OK: Go to next step
CHECK HARNESS AND CONNECTOR (MAP LIGHT ASSEMBLY - MAIN BODY ECU) Disconnect the T10 map light assembly connector. Disconnect the F14 main body ECU (multiplex network body ECU) connector. Measure the resistance according to the value(s) in the table. Standard Resistance Tester Connection Condition Specified Condition T10-18 (DOOR) - F14-25 (DMDR) Always Below 1 ohms T10-18 (DOOR) - Body ground Always 10 kohms or higher TEXT IN ILLUSTRATION *1 Front view of wire harness connector (to Map Light Assembly) *2 Front view of wire harness connector (to Main Body ECU (Multiplex Network Body ECU)) NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR OK --> See step 9
INSPECT MAP LIGHT ASSEMBLY Remove the map light assembly. Refer to «REMOVAL»(/lexus/rx/iii-2008-2012/remont/interiorillumination-lights/#lighting-interior-service-information) . Measure the resistance according to the value(s) in the table. Standard Resistance Tester Connection Condition Specified Condition 17 (CILL) - 40 (GND) Interior light on/off switch not pushed 10 kohms or higher Interior light on/off switch pushed Below 1 ohms TEXT IN ILLUSTRATION *1 Component without harness connected: (Map Light Assembly) NG --> See step 8 OK: Go to next step
CHECK HARNESS AND CONNECTOR (MAP LIGHT ASSEMBLY - MAIN BODY ECU) Disconnect the map light assembly connector. Disconnect the main body ECU (multiplex network body ECU) connector. Measure the resistance according to the value(s) in the table. Standard Resistance Tester Connection Condition Specified Condition T10-17 (CILL) - F14-26 (DMON) Always Below 1 ohms T10-17 (CILL) - Body ground Always 10 kohms or higher TEXT IN ILLUSTRATION *1 Front view of wire harness connector (to Map Light Assembly) *2 Front view of wire harness connector (to Main Body ECU (Multiplex Network Body ECU)) NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR OK --> See step 9
INSPECT MAP LIGHT ASSEMBLY Remove the map light assembly. Refer to «REMOVAL»(/lexus/rx/iii-2008-2012/remont/interiorillumination-lights/#lighting-interior-service-information) . Measure the resistance according to the value(s) in the table. Standard Resistance Tester Connection Condition Specified Condition 18 (DOOR) - 40 (GND) Interior light door switch pushed 10 kohms or higher Interior light door switch not pushed Below 1 ohms 17 (CILL) - 40 (GND) Interior light on/off switch not pushed 10 kohms or higher Interior light on/off switch pushed Below 1 ohms TEXT IN ILLUSTRATION *1 Component without harness connected: (Map Light Assembly) NG --> See step 8 OK --> REPAIR OR REPLACE HARNESS OR CONNECTOR (MAP LIGHT ASSEMBLY - BODY GROUND)
PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE. Refer to «PROBLEM SYMPTOMS TABLE»
REPLACE MAP LIGHT ASSEMBLY. Refer to «REMOVAL»(/lexus/rx/iii-2008-2012/remont/interiorillumination-lights/#lighting-interior-service-information) .
REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU). Refer to «REMOVAL (TO 8/2009)»

The main body ECU (multiplex network body ECU) detects the condition of the interior light door switch and interior light on/off switch.

The main body ECU (multiplex network body ECU) controls the center console spot light.

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Scheme 35: WIRING DIAGRAM

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Scheme 36: PROCEDURE

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PERFORM ACTIVE TEST USING TECHSTREAM Connect the Techstream to the DLC3. Turn the engine switch on (IG). Turn the Techstream on. Enter the following menus: Body Electrical / Main Body / Active Test. Check that the center console spot light comes on. MAIN BODY Tester Display Test Part Control Range Diagnostic Note Center Console Spot LGT Center console spot light ON/OFF Engine switch off OK Center console spot light comes on. NG --> See step 2 OK --> See step 5
INSPECT MAP LIGHT ASSEMBLY Remove the map light assembly. Refer to «REMOVAL»(/lexus/rx/iii-2008-2012/remont/interiorillumination-lights/#lighting-interior-service-information) Connect a positive (+) lead from the battery to terminal 9 and a negative (-) lead to terminal 16. Check that the center console spot light comes on. OK Center console spot light comes on. TEXT IN ILLUSTRATION *1 Component without harness connected (Map Light Assembly) NG --> See step 4 OK: Go to next step
CHECK HARNESS AND CONNECTOR (MAP LIGHT ASSEMBLY - MAIN BODY ECU AND BODY GROUND) Disconnect the T10 map light assembly connector. Disconnect the F12 main body ECU (multiplex network body ECU) connector. Measure the resistance according to the value(s) in the table below. Standard Resistance Tester Connection Condition Specified Condition T10-16 (SHFT) - F12-5 (CSPT) Always Below 1 ohms T10-16 (SHFT) - Body ground Always 10 kohms or higher Measure the voltage according to the value(s) in the table below. Standard Voltage Tester Connection Condition Specified Condition T10-9 (+B1) - Body ground Always 11 to 14 V TEXT IN ILLUSTRATION *1 Front view of wire harness connector (to Map Light Assembly) *2 Front view of wire harness connector (to Main Body ECU (Multiplex Network Body ECU)) NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR OK --> See step 6
REPLACE MAP LIGHT ASSEMBLY. Refer to «REMOVAL»(/lexus/rx/iii-2008-2012/remont/interiorillumination-lights/#lighting-interior-service-information)
PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE. Refer to «PROBLEM SYMPTOMS TABLE»
REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU). Refer to «REMOVAL (TO 8/2009)»

The main body ECU (multiplex network body ECU) controls the center console spot light.

The illuminated entry system controls the engine switch illumination.

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Scheme 38: WIRING DIAGRAM

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Scheme 39: PROCEDURE

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PERFORM ACTIVE TEST USING TECHSTREAM Connect the Techstream to the DLC3. Turn the engine switch on (IG). Turn the Techstream on. Enter the following menus: Body Electrical / Smart Access / Active Test. Check that the illumination operates. SMART ACCESS Tester Display Test Part Control Range Diagnostic Note Power/Engine SW Light Engine switch illumination ON/OFF - OK Engine switch illumination comes on. NG --> See step 2 OK --> See step 5
INSPECT ENGINE SWITCH Remove the engine switch. Refer to «REMOVAL (TO 08/2009)». Connect a positive (+) lead from the battery to terminal 11 and a negative (-) lead to terminal 5. Check that the illumination comes on. OK Engine switch illumination comes on. TEXT IN ILLUSTRATION *1 Illumination *2 Component without harness connected (Engine Switch) NG --> See step 4 OK: Go to next step
CHECK HARNESS AND CONNECTOR (ENGINE SWITCH - CERTIFICATION ECU AND BODY GROUND) Disconnect the F58 certification ECU (smart key ECU assembly) connector. Disconnect the F22 engine switch connector. Measure the resistance according to the value(s) in the table below. Standard Resistance Tester Connection Condition Specified Condition F22-11 (SWIL) - F58-11 (SWIL) Always Below 1 ohms F22-11 (SWIL) - Body ground Always 10 kohms or higher F22-5 (GND) - Body ground Always Below 1 ohms TEXT IN ILLUSTRATION *1 Front view of wire harness connector (to Engine Switch) *2 Front view of wire harness connector (to Certification ECU (Smart Key ECU Assembly)) NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR OK --> See step 6
REPLACE ENGINE SWITCH. Refer to «REMOVAL (TO 08/2009)».
PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE. Refer to «PROBLEM SYMPTOMS TABLE»
REPLACE CERTIFICATION ECU (SMART KEY ECU ASSEMBLY). Refer to «REMOVAL»

The illuminated entry system controls the engine switch illumination.

The power back door unit assembly (power back door ECU) receives a signal from the back door courtesy switch to control the luggage compartment light.

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Scheme 41: WIRING DIAGRAM

Scheme 42

Scheme 42: PROCEDURE

CHECK HARNESS AND CONNECTOR (BATTERY - POWER BACK DOOR UNIT ASSEMBLY) Disconnect the P33 power back door unit assembly (power back door ECU) connector. Measure the voltage according to the value(s) in the table below. Standard Voltage Tester connection Switch Condition Specified condition P33-3 (CTYO) - Body ground Luggage compartment light switch off Below 1 V P33-3 (CTYO) - Body ground Luggage compartment light switch on 11 to 14 V TEXT IN ILLUSTRATION *1 Front view of wire harness connector (to Power Back Door Unit Assembly (Power Back Door ECU)) NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR OK --> See step 2
PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE. Refer to «PROBLEM SYMPTOMS TABLE»