Lighting System (Interior) (Diagnostics & Circuit Tests): Diagnosis Lexus CT 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 AUXILIARY BATTERY VOLTAGE Measure the auxiliary battery voltage with the power switch off. Standard Voltage 11 to 14 V If the voltage is below 11 V, recharge or replace the auxiliary 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-568746-S15103859142013072300000) 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 step 7 A: Go to next step
6. OVERALL ANALYSIS AND TROUBLESHOOTING* Data List / Active Test. Refer to «DATA LIST / ACTIVE TEST»(ref-568600-S33102992702013072300000) Terminals of ECU. Refer to «TERMINALS OF ECU»(ref-568600-S21992306882013072300000) 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

BATTERY SAVING CONTROL

LUGGAGE COMPARTMENT ROOM LIGHT

FRONT PERSONAL LIGHT

CENTER CONSOLE SPOT LIGHT

INSTRUMENT PANEL ILLUMINATION

INTERIOR LIGHT CONTROL (WHEN OPERATING DOME ON/OFF SWITCH)

Scheme 15

Scheme 16

1. CHECK INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY AND MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU) Disconnect the 2A, 2B, 2C, 2E and H17 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. Wiring Color Terminal Description Condition Specified Condition 2A-43 - Body ground G - Body ground ACC power supply Power switch on (ACC) 11 to 14 V Power switch off Below 1 V 2B-4 - Body ground W-B - Body ground Ground Always Below 1 ohms 2B-25 - Body ground B - Body ground IG power supply Power switch on (IG) 11 to 14 V Power switch off Below 1 V 2C-18 - Body ground B - Body ground Auxiliary battery power supply Power switch off 11 to 14 V 2E-1 - Body ground W - Body ground Auxiliary 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-4 - Body ground W-B - Body ground Ground Always Below 1 ohms 2B-6 (GND1) - Body ground W-B - Body ground Ground Always Below 1 ohms H17-3 (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 H17 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-17 - Body ground L - Body ground Footwell light RH drive output Footwell light RH off 11 to 14 V Footwell light RH on Below 1 V 2B-18 - Body ground V - Body ground Footwell light LH drive output Footwell light LH off 11 to 14 V Footwell light LH on Below 1 V 2B-27 - Body ground G - Body ground Interior lights drive output Power switch off, interior lights off (illuminated entry system operation) 11 to 14 V Power switch off, interior lights on (illuminated entry system operation) Below 1 V 2D-25 - 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 2D-35 - Body ground BR - Body ground Front door courtesy light switch LH input Front door LH open Below 1 V Front door LH closed 11 to 14 V 2D-36 - Body ground BR - Body ground Front door courtesy light switch RH input Front door RH open Below 1 V Front door RH closed 11 to 14 V H16-6 (RCTY) - Body ground G - Body ground Rear door courtesy light switch RH input Rear door RH open Below 1 V Rear door RH closed 11 to 14 V H16-7 (LSFL) - Body ground GR - Body ground Front door unlock detection switch LH input Front door LH locked Pulse generation Front door LH unlocked Below 1 V H16-18 (LSFR) - Body ground SB - Body ground Front door unlock detection switch RH input Front door RH locked Pulse generation Front door RH unlocked Below 1 V H16-19 (BCTY) - Body ground SB - Body ground Back door courtesy light switch input Back door open Below 1 V Back door closed 11 to 14 V H17-2 (LSWR) - Body ground GR - Body ground Rear door unlock detection switch RH input Rear door RH locked Pulse generation Rear door RH unlocked Below 1 V H18-2 (CSPT) - Body ground SB - Body ground Center console spot light (blue) drive output Center console spot light (blue) off Below 1 V Center console spot light (blue) on 11 to 14 V H18-3 (LCTY) - Body ground G - Body ground Rear door courtesy light switch LH input Rear door LH open Below 1 V Rear door LH closed Pulse generation H18-6 (OSPT) - Body ground Y - Body ground Center console spot light (red) drive output Center console spot light (red) off Below 1 V Center console spot light (red) on 11 to 14 V H18-12 (BCYL) - Body ground SB - Body ground Luggage compartment room light drive output 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 H1 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 H1-1 (+B) - Body ground B - Body ground +B 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 H1-15 (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 H1 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 H1-11 (SWIL) - Body ground G - Body ground Power switch illumination drive output Power switch illumination on 11 to 14 V Power switch illumination off Below 1 V H1-16 (IG) - Body ground BE - Body ground IG power supply Power switch on (IG) 11 to 14 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-568589-S28103458762013072300000) .
3. INSPECT AUXILIARY BATTERY VOLTAGE Measure the auxiliary battery voltage with the power switch off. Standard Voltage 11 to 14 V If the voltage is below 11 V, recharge or replace the auxiliary 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 - Back door Courtesy SW Back door courtesy light switch signal/ON or OFF ON: Back door open OFF: Back door 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 - 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 - Interior Light Control Operation of the illuminated entry system/OFF or ON OFF: The system not operated ON: The system operated Customized value displayed I/L ON W/Door Key Unlock Setting of the function that lights up the interior lights when the doors are unlocked/OFF or ON OFF: The function not provided ON: The function provided Customized value displayed Lighting Time Lighting time of the delay control function (illuminated entry system)/15s, 7.5s or 30s 15s: 15 seconds 7.5s: 7.5 seconds 30s: 30 seconds Customized value displayed Room Light when Aprchd Setting of the function that lights up the interior lights when a key enters any actuation area/OFF or ON OFF: The function not provided ON: The function provided Customized value displayed Inside Foot Light Setting of the function that lights up the footwell lights (Always)/OFF or ON OFF: The function not provided ON: The function provided Customized value displayed Center Console Spot Light Setting of the function that lights up the center console spot light/OFF or ON OFF: The function not provided ON: The function provided Customized value displayed I/L when ACC OFF Setting of the function that lights up the interior lights when the power switch on (ACC)/OFF or ON OFF: The function not provided ON: The function provided Customized value displayed Light Control Setting of the function that lights up the footwell lights (while Driving)/OFF or ON OFF: The function not provided ON: The function provided Customized value displayed
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 and rear interior light ON/OFF Interior light on/off switch off (not pushed), interior light door switch on (not pushed) and all doors closed Fr Foot Light Footwell lights ON/OFF Power switch off Center Consol Spot LGT Center console spot lights (red, blue) 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 17

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 4
2. CHECK HARNESS AND CONNECTOR (INSTRUMENT PANEL JUNCTION BLOCK - AUXILIARY 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 2B-25 - Body ground Power switch on (IG) 11 to 14 V Measure the resistance according to the value(s) in the table below. Standard Resistance Tester Connection Condition Specified Condition 2B-4 - Body ground Always Below 1 ohms 2B-6 - Body ground Always Below 1 ohms NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR OK: Go to next step
3. INSPECT INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY (IG1 NO. 1 RELAY) Remove the instrument panel junction block assembly. Refer to «REMOVAL»(ref-568756-S16773882952013072300000) . Remove the main body ECU (multiplex network body ECU) from 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 2E-1 - A-32 (IG) Always 10 kohms or higher 2E-1 - A-32 (IG) Auxiliary battery positive (+) --> 2B-25 Auxiliary battery negative (-) --> 2B-6 Auxiliary battery negative (-) --> 2B-4 Below 1 ohms TEXT IN ILLUSTRATION *a Component with harness connected (Instrument panel junction block assembly) *b Component with harness connected (Instrument panel junction block assembly) *c Component with harness connected (Instrument panel junction block assembly) - - NG --> See step 5 OK --> See step 6
4. PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE. Refer to «PROBLEM SYMPTOMS TABLE»(ref-568600-S37783609732013072300000)
5. REPLACE INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY. Refer to «REMOVAL»(ref-568756-S16773882952013072300000)
6. REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU). Refer to «REMOVAL»(ref-568756-S16773882952013072300000)

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

Scheme 18

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 4
2. CHECK HARNESS AND CONNECTOR (INSTRUMENT PANEL JUNCTION BLOCK - AUXILIARY BATTERY AND BODY GROUND) Disconnect the 2E, 2A 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 2A-43 - Body ground Power switch on (ACC) 11 to 14 V Measure the resistance according to the value(s) in the table below. Standard Resistance Tester Connection Condition Specified Condition 2B-4 - Body ground Always Below 1 ohms 2B-6 - Body ground Always Below 1 ohms NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR OK: Go to next step
3. INSPECT INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY (ACC RELAY) Remove the instrument panel junction block assembly. Refer to «REMOVAL»(ref-568756-S16773882952013072300000) . Remove the main body ECU (multiplex network body ECU) from 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 2E-1 - A-29 (ACC) Always 10 kohms or higher 2E-1 - A-29 (ACC) Auxiliary battery positive (+) --> 2A-43 Auxiliary battery negative (-) --> 2B-4 Auxiliary battery negative (-) --> 2B-6 Below 1 ohms TEXT IN ILLUSTRATION *a Component with harness connected (Instrument panel junction block assembly) *b Component with harness connected (Instrument panel junction block assembly) *c Component with harness connected (Instrument panel junction block assembly) *d Component with harness connected (Instrument panel junction block assembly) NG --> See step 5 OK --> See step 6
4. PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE. Refer to «PROBLEM SYMPTOMS TABLE»(ref-568600-S37783609732013072300000)
5. REPLACE INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY. Refer to «REMOVAL»(ref-568756-S16773882952013072300000)
6. REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU). Refer to «REMOVAL»(ref-568756-S16773882952013072300000)

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

Scheme 19

1. PERFORM ACTIVE TEST 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 / Active Test. Check that the lights operate. MAIN BODY Tester Display Test Part Control Range Diagnostic Note Illuminated Entry System Front interior lights and rear interior light ON/OFF Interior light on/off switch off (not pushed), interior light door switch on (not pushed) and all doors closed OK Each light fades in. NG --> See step 2 OK --> See step 5
2. CHECK HARNESS AND CONNECTOR (AUXILIARY BATTERY - INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY) Disconnect the 2B instrument panel junction block assembly connector. Measure the voltage according to the value(s) in the table below. HINT: Perform the check under the following condition: Map light switch LH and RH off Interior light door switch in DOOR position Standard Voltage Tester Connection Condition Specified Condition 2B-27 - Body ground Power switch off 11 to 14 V NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR OK: Go to next step
3. INSPECT INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY Remove the instrument panel junction block assembly. Refer to «REMOVAL»(ref-568756-S16773882952013072300000) . Remove the main body ECU (multiplex network body ECU) from the instrument panel junction block assembly. Measure the resistance according to the value(s) in the table below. TEXT IN ILLUSTRATION *a Component without harness connected (Instrument Panel Junction Block Assembly) *b Component without harness connected (Instrument Panel Junction Block Assembly) Standard Resistance Tester Connection Condition Specified Condition 2B-27 - A-1 (ILE) Always Below 1 ohms A-1 (ILE) - Body ground Always 10 kohms or higher NG --> See step 6 OK --> See step 4
4. REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU). Refer to «REMOVAL»(ref-568756-S16773882952013072300000)
5. PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE. Refer to «PROBLEM SYMPTOMS TABLE»(ref-568600-S37783609732013072300000)
6. REPLACE INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY. Refer to «REMOVAL»(ref-568756-S16773882952013072300000)

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

Scheme 20

1. PERFORM ACTIVE TEST 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 / Active Test. Check that the footwell lights come on. MAIN BODY Tester Display Test Part Control Range Diagnostic Note Fr Foot Light Footwell lights ON/OFF Power switch off OK Footwell lights come on. NG --> See step 2 OK --> See step 5
2. CHECK HARNESS AND CONNECTOR (INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY - AUXILIARY BATTERY) Disconnect the 2B 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 2B-17 - Body ground Power switch off 11 to 14 V 2B-18 - Body ground Power switch off 11 to 14 V NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR OK: Go to next step
3. INSPECT INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY Remove the instrument panel junction block assembly. Refer to «REMOVAL»(ref-568756-S16773882952013072300000) . Remove the main body ECU (multiplex network body ECU) from the instrument panel junction block assembly. Measure the resistance according to the value(s) in the table below. TEXT IN ILLUSTRATION *a Component without harness connected (Instrument Panel Junction Block Assembly) *b Component without harness connected (Instrument Panel Junction Block Assembly) Standard Resistance Tester Connection Condition Specified Condition 2B-17 - A-26 (FSPT) Always Below 1 ohms 2B-18 - A-26 (FSPT) Always Below 1 ohms A-26 (FSPT) - Body ground Always 10 kohms or higher NG --> See step 6 OK --> See step 4
4. REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU). Refer to «REMOVAL»(ref-568756-S16773882952013072300000)
5. PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE. Refer to «PROBLEM SYMPTOMS TABLE»(ref-568600-S37783609732013072300000)
6. REPLACE INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY. Refer to «REMOVAL»(ref-568756-S16773882952013072300000)

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

Scheme 21

1. PERFORM ACTIVE TEST 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 / Active Test. Check that the center console spot lights come on. MAIN BODY Tester Display Test Part Control Range Diagnostic Note Center Console Spot LGT Center console spot lights (red, blue) ON/OFF Power switch off OK Center console spot lights come on. NG --> See step 2 OK --> See step 5
2. INSPECT MAP LIGHT ASSEMBLY Remove the map light assembly. Refer to «REMOVAL»(ref-568808-S33060818302013072300000) . Connect a positive (+) lead from the auxiliary battery to terminal 21 (+B1) and a negative (-) lead to terminal 5 (ILLB). Check that the center console spot light (red) comes on. Connect a positive (+) lead from the auxiliary battery to terminal 21 (+B1) and a negative (-) lead to terminal 6 (ILLB). Check that the center console spot light (blue) comes on. OK Each center console spot light comes on. TEXT IN ILLUSTRATION *a Component without harness connected (Map Light Assembly) NG --> See step 4 OK: Go to next step
3. CHECK HARNESS AND CONNECTOR (MAP LIGHT ASSEMBLY - MAIN BODY ECU AND AUXILIARY BATTERY) Disconnect the T6 map light assembly connector. Disconnect the H18 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 T6-6 (ILLB) - H18-2 (CSPT) Always Below 1 ohms T6-6 (ILLB) - Body ground Always 10 kohms or higher T6-5 (ILLB) - H18-6 (OSPT) Always Below 1 ohms T6-5 (ILLB) - 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 T6-21 (+B1) - Body ground Power switch off 11 to 14 V NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR OK --> See step 6
4. REPLACE MAP LIGHT ASSEMBLY. Refer to «REMOVAL»(ref-568808-S33060818302013072300000)
5. PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE. Refer to «PROBLEM SYMPTOMS TABLE»(ref-568600-S37783609732013072300000)
6. REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU). Refer to «REMOVAL»(ref-568756-S16773882952013072300000)