Lighting (Interior) (Diagnostics): Diagnosis Lexus HS I

HOW TO PROCEED WITH TROUBLESHOOTING

HINT

1. Use the following procedure to troubleshoot the lighting system.
2. *: Use the Techstream.

1. VEHICLE BROUGHT TO WORKSHOP NEXT: Go to next step
2. CUSTOMER PROBLEM ANALYSIS AND SYMPTOM CHECK NEXT: Go to next step
3. INSPECT BATTERY VOLTAGE Measure the battery voltage with the power switch off. Standard Voltage 11 to 14 V If the voltage is below 11 V, recharge or replace the battery before proceeding to the next step. NEXT: Go to next step
4. INSPECT CAN COMMUNICATION SYSTEM* Use the Techstream to check if the CAN communication system is functioning normally. Result Result Proceed to CAN communication system DTC is not output. A CAN communication system DTC is output. B B --> GO TO «CAN COMMUNICATION SYSTEM»(ref-398235-S41837468932011051600000) CAN COMMUNICATION SYSTEM A: Go to next step
5. PROBLEM SYMPTOMS TABLE Result Result Proceed to Fault is not listed in Problem Symptoms Table. A Fault is listed in Problem Symptoms Table. B B --> Go to 7 step 7 A: Go to next step
6. OVERALL ANALYSIS AND TROUBLESHOOTING* Data List / Active Test. Refer to «DATA LIST / ACTIVE TEST»(ref-398302-S34451913692011051600000) Terminals of ECU. Refer to «TERMINALS OF ECU»(ref-398302-S38392336652011051600000) NEXT: Go to next step
7. ADJUST, REPAIR OR REPLACE NEXT: Go to next step
8. CONFIRMATION TEST NEXT --> END

PROBLEM SYMPTOMS TABLE

HINT

Use the table below to help determine the cause of problem symptoms. If multiple suspected areas are listed, the potential causes of the symptoms are listed in order of probability in the "Suspected Area" column of the table. Check each symptom by checking the suspected areas in the order they are listed. Replace parts as necessary.

ILLUMINATED ENTRY SYSTEM (INTERIOR LIGHT CONTROL)

ILLUMINATED ENTRY SYSTEM (FOOTWELL LIGHT CONTROL)

VANITY LIGHT

GLOVE BOX LIGHT

DOOR COURTESY LIGHT

BATTERY SAVING CONTROL

LUGGAGE COMPARTMENT ROOM LIGHT

CONSOLE BOX LIGHT

FRONT PERSONAL LIGHT

CENTER CONSOLE SPOT LIGHT

INSTRUMENT PANEL ILLUMINATION

Scheme 30

Scheme 31

1. CHECK INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY AND MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU) Disconnect the 2A, 2B, 2C, 2E and F7 instrument panel junction block assembly and main body ECU (multiplex network body ECU) connectors. Measure the voltage according to the value(s) in the table below. Terminal No. (Symbol) Wiring Color Terminal Description Condition Specified Condition 2A-43 - Body ground GR - Body ground ACC power supply Power switch on (ACC) 11 to 14 V Power switch off Below 1 V 2B-25 - Body ground P - Body ground IG power supply Power switch on (IG) 11 to 14 V Power switch off Below 1 V 2C-18 (BECU) - Body ground R - Body ground Battery power supply Power switch off 11 to 14 V 2E-1 - Body ground B - Body ground Battery power supply Power switch off 11 to 14 V If the result is not as specified, there may be a malfunction in the wire harness. Measure the resistance according to the value(s) in the table below. Terminal No. (Symbol) Wiring Color Terminal Description Condition Specified Condition 2B-6 (GND1) - Body ground W-B - Body ground Ground Always Below 1 ohms F7-3 (GND2) - Body ground W-B - Body ground Ground Always Below 1 ohms If the result is not as specified, there may be a malfunction in the wire harness. Reconnect the 2A, 2B, 2C, 2E and F7 instrument panel junction block assembly and main body ECU (multiplex network body ECU) connectors. Measure the voltage and check for pulses according to the value(s) in the table below. Terminal No. (Symbol) Wiring Color Terminal Description Condition Specified Condition 2B-11 (FRCL) - Body ground Y - Body ground Front courtesy light RH drive output Front door RH closed 11 to 14 V Front door RH open Below 1 V 2B-13 (FLCY) - Body ground L - Body ground Front door courtesy light switch LH input Front door LH open Below 1 V Front door LH closed 11 to 14 V 2B-17 (FSPT) - Body ground B - Body ground Footwell light RH drive output Footwell light RH off 11 to 14 V Footwell light RH on Below 1 V 2B-18 (FSPT) - Body ground SB - Body ground Footwell light LH drive output Footwell light LH off 11 to 14 V Footwell light LH on Below 1 V 2B-27 (ILE) - Body ground L - Body ground Interior lights drive output Interior lights off and personal light switch off (not pushed) 11 to 14 V Interior lights on and personal light switch off Below 1 V 2B-31 (FRCY) - Body ground R - Body ground Front door courtesy light switch RH input Front door RH open Below 1 V Front door RH closed 11 to 14 V 2D-25 (LSR) - Body ground GR - Body ground Rear door unlock detection switch LH input Rear door LH locked Pulse generation Rear door LH unlocked Below 1 V F7-2 (LSWR) - Body ground L - Body ground Rear door unlock detection switch RH input Rear door RH locked Pulse generation Rear door RH unlocked Below 1 V F7-25 (DMDR) - Body ground W - Body ground Interior light door switch input Interior light door switch pushed Pulse generation Interior light door switch not pushed Below 1 V F7-26 (DMON) - Body ground B - Body ground Interior light on/off switch input Interior light on/off switch not pushed Pulse generation Interior light on/off switch pushed Below 1 V F8-1 (FLCL) - Body ground G - Body ground Front door courtesy light LH drive output Front door LH closed 11 to 14 V Front door LH open Below 1 V F8-3 (LCTY) - Body ground LG - Body ground Rear door courtesy light switch LH input Rear door LH open Below 1 V Rear door LH closed Pulse generation F8-5 (CSPT) - Body ground P - Body ground Center console spot light drive output Power switch off Below 1 V Power switch on (ACC or IG) Pulse generation F8-12 (BCYL) - Body ground Y - Body ground Luggage compartment room light drive output Luggage compartment door open Below 1 V Luggage compartment door closed 11 to 14 V F9-6 (RCTY) - Body ground GR - Body ground Rear door courtesy light switch RH input Rear door RH open Below 1 V Rear door RH closed Pulse generation F9-7 (LSFL) - Body ground P - Body ground Front door unlock detection switch LH input Front door LH locked Pulse generation Front door LH unlocked Below 1 V F9-18 (LSFR) - Body ground LG - Body ground Front door unlock detection switch RH input Front door RH locked Pulse generation Front door RH unlocked Below 1 V F9-19 (LGCY) - Body ground SB - Body ground Luggage compartment door courtesy light switch input Luggage compartment door open Below 1 V Luggage compartment door closed 11 to 14 V If the result is not as specified, the main body ECU (multiplex network body ECU) or instrument panel junction block assembly may have a malfunction.
2. CHECK CERTIFICATION ECU (SMART KEY ECU ASSEMBLY) Disconnect the F50 certification ECU (smart key ECU assembly) connector. Measure the voltage according to the value(s) in the table below. Terminal No. (Symbol) Wiring Color Terminal Description Condition Specified Condition F50-1 (+B) - Body ground R - Body ground +B power supply Always 11 to 14 V If the result is not as specified, there may be a malfunction in the wire harness. Measure the resistance according to the value(s) in the table below. Terminal No. (Symbol) Wiring Color Terminal Description Condition Specified Condition F50-15 (E) - Body ground W-B - Body ground Ground Always Below 1 ohms If the result is not as specified, there may be a malfunction in the wire harness. Reconnect the F50 certification ECU (smart key ECU assembly) connector. Measure the voltage and check for pulses according to the value(s) in the table below. Terminal No. (Symbol) Wiring Color Terminal Description Condition Specified Condition F50-11 (SWIL) - Body ground SB - Body ground Power switch illumination drive output Power switch illumination on 11 to 14 V or pulse generation Power switch illumination off Below 1 V If the result is not as specified, the certification ECU (smart key ECU assembly) may have a malfunction.

DIAGNOSIS SYSTEM

1. DESCRIPTION Lighting system data can be read from the Data Link Connector 3 (DLC3) of the vehicle. When the system seems to be malfunctioning, use the Techstream to check for malfunctions and perform repairs.
2. CHECK DLC3 Check the DLC3. Refer to «GENERAL INFORMATION»(ref-398089-S21707799022011051600000) .
3. INSPECT BATTERY VOLTAGE Measure the battery voltage with the power switch off. Standard Voltage 11 to 14 V If the voltage is below 11 V, recharge or replace the battery.

DATA LIST / ACTIVE TEST

1. DATA LIST HINT: Using the Techstream to read the Data List allows the values or states of switches, sensors, actuators and other items to be read without removing any parts. This non-intrusive inspection can be very useful because intermittent conditions or signals may be discovered before parts or wiring is disturbed. Reading the Data List information early in troubleshooting is one way to save diagnostic time. NOTE: In the following table, the values listed under "Normal Condition" are reference values. Do not depend solely on these reference values when deciding whether a part is faulty or not. Connect the Techstream to the DLC3. Turn the power switch on (IG). Turn the Techstream on. Enter the following menus: Body Electrical / Main Body / Data List. Read the Data List according to the display on the Techstream. MAIN BODY Tester Display Measurement Item/Range Normal Condition Diagnostic Note ACC SW Power switch ACC signal/ON or OFF ON: Power switch on (ACC) OFF: Power switch off - IG SW Power switch IG signal/ON or OFF ON: Power switch on (IG) OFF: Power switch off - RR Door Courtesy SW Rear door courtesy light switch RH signal/ON or OFF ON: Rear door RH open OFF: Rear door 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 Lock Pos Front door unlock detection switch RH signal/ON or OFF ON: Front door RH unlocked OFF: Front door RH locked - FR Door Courtesy Front door RH condition signal/ON or OFF ON: Front door RH closed OFF: Front door RH open - FL Door Lock Pos Front door unlock detection switch LH signal/ON or OFF ON: Front door LH unlocked OFF: Front door LH locked - FL Door Courtesy Front door LH condition signal/ON or OFF ON: Front door LH closed OFF: Front door LH open - 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 - RR-Door Lock Pos SW Rear door unlock detection switch RH signal/ON or OFF ON: Rear door RH unlocked OFF: Rear door RH locked - RL-Door Lock Pos SW Rear door unlock detection switch LH signal/ON or OFF ON: Rear door LH unlocked OFF: Rear door LH locked - Luggage Courtesy SW Luggage compartment door courtesy light switch signal/ON or OFF ON: Luggage compartment door open OFF: Luggage compartment door closed
2. ACTIVE TEST HINT: Using the Techstream to perform Active Tests allows relays, VSVs, actuators and other items to be operated without removing any parts. This non-intrusive functional inspection can be very useful because intermittent operation may be discovered before parts or wiring is disturbed. Performing Active Tests early in troubleshooting is one way to save diagnostic time. Data List information can be displayed while performing Active Tests. Connect the Techstream to the DLC3. Turn the power switch on (IG). Turn the Techstream on. Enter the following menus: Body Electrical / Main Body or Smart Access / Active Test. Perform the Active Test according to the display on the Techstream. MAIN BODY Tester Display Test Part Control Range Diagnostic Note Illuminated Entry System Front interior lights, rear interior light and scuff plate lights ON/OFF Interior light on/off switch off (not pushed), personal light switch off (not pushed) and all doors closed Step Light Operation Footwell lights ON/OFF Power switch off Center Console Spot LGT Center console spot light ON/OFF Power switch off SMART ACCESS Tester Display Test Part Control Range Diagnostic Note Power/Engine SW Light Power switch illumination ON/OFF All doors closed

INSPECTION PROCEDURE

Note. Inspect the fuses for circuits related to this system before performing the following inspection procedure.

Scheme 32

Scheme 33

1. READ VALUE USING TECHSTREAM Connect the Techstream to the DLC3. Turn the power switch on (IG). Turn the Techstream on. Enter the following menus: Body Electrical / Main Body / Data List. Read the display on the Techstream. MAIN BODY Tester Display Measurement Item/Range Normal Condition Diagnostic Note IG SW Power switch IG signal/ON or OFF ON: Power switch on (IG) OFF: Power switch off - OK Normal conditions listed above are displayed. NG --> See step 2 OK --> See step 5
2. CHECK HARNESS AND CONNECTOR (INSTRUMENT PANEL JUNCTION BLOCK - BATTERY AND BODY GROUND) Disconnect the 2E and 2B instrument panel junction block assembly connectors. Measure the voltage according to the value(s) in the table below. Standard Voltage Tester Connection Condition Specified Condition 2E-1 - Body ground Power switch off 11 to 14 V Measure the resistance according to the value(s) in the table below. Standard Resistance Tester Connection Condition Specified Condition 2B-6 - Body ground Always Below 1 ohms NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR OK: Go to next step
3. CHECK HARNESS AND CONNECTOR (IG POWER SOURCE CIRCUIT) Measure the voltage according to the value(s) in the table below. Standard Voltage Tester Connection Condition Specified Condition 2B-25 - Body ground Power switch on (IG) 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
4. INSPECT INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY Remove the main body ECU (multiplex network body ECU) from the instrument panel junction block assembly. Reconnect the 2E and 2B instrument panel junction block assembly connectors. Measure the voltage according to the value(s) in the table below. Standard Voltage Tester Connection Condition Specified Condition A-32 (IG) - Body ground Power switch on (IG) 11 to 14 V TEXT IN ILLUSTRATION *1 Instrument Panel Junction Block Assembly NG --> REPLACE INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY OK --> See step 6
5. PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE. Refer to «PROBLEM SYMPTOMS TABLE»(ref-398302-S25787969952011051600000)
6. REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU). Refer to «REMOVAL»(ref-398241-S22735242352011051600000)

Note. Inspect the fuses for circuits related to this system before performing the following inspection procedure.

Scheme 34

Scheme 35

1. READ VALUE USING TECHSTREAM Connect the Techstream to the DLC3. Turn the power switch on (IG). Turn the Techstream on. Enter the following menus: Body Electrical / Main Body / Data List. Read the display on the Techstream. MAIN BODY Tester Display Measurement Item/Range Normal Condition Diagnostic Note ACC SW Power switch ACC signal / ON or OFF ON: Power switch on (ACC) OFF: Power switch off - OK Normal conditions listed above are displayed. NG --> See step 2 OK --> See step 5
2. CHECK HARNESS AND CONNECTOR (INSTRUMENT PANEL JUNCTION BLOCK - BATTERY AND BODY GROUND) Disconnect the 2E and 2B instrument panel junction block assembly connectors. Measure the voltage according to the value(s) in the table below. Standard Voltage Tester Connection Condition Specified Condition 2E-1 - 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 2B-6 - Body ground Always Below 1 ohms NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR OK: Go to next step
3. CHECK HARNESS AND CONNECTOR (ACC POWER SOURCE CIRCUIT) Measure the voltage according to the value(s) in the table below. Standard Voltage Tester Connection Condition Specified Condition 2A-43 - Body ground Power switch on (ACC) 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
4. INSPECT INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY Remove the main body ECU (multiplex network body ECU) from the instrument panel junction block assembly. Reconnect the 2E and 2B instrument panel junction block assembly connectors. Measure the voltage according to the value(s) in the table below. Standard Voltage Tester Connection Condition Specified Condition A-29 (ACC) - Body ground Power switch on (ACC) 11 to 14 V TEXT IN ILLUSTRATION *1 Instrument Panel Junction Block Assembly NG --> REPLACE INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY OK --> See step 6
5. PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE. Refer to «PROBLEM SYMPTOMS TABLE»(ref-398302-S25787969952011051600000)
6. REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU). Refer to «REMOVAL»(ref-398241-S22735242352011051600000)