Lighting System (interior) (diagnostics & Circuit Tests) Toyota Prius C I

PRECAUTION

1. PRECAUTION FOR DISCONNECTING CABLE FROM NEGATIVE AUXILIARY BATTERY TERMINAL NOTE: When disconnecting the cable from the negative (-) auxiliary battery terminal, initialize the following system after the cable is reconnected. System Name See Procedure Power Door Lock Control System Refer to «INITIALIZATION»(/toyota/prius-c/i-2011-2015/remont/hoistjack/#introduction__initialization)
2. IGNITION SWITCH EXPRESSIONS The type of ignition switch used on this model differs depending on the specifications of the vehicle. The expressions listed in the table below are used in this information. Expression Ignition Switch (Position) Power Switch (Condition) Ignition Switch off LOCK Off (Lock) Ignition Switch ACC ACC On (ACC) Ignition Switch ON (IG) ON (IG) On (IG) Ignition switch ON (READY) ON (READY) On (Ready)
3. PRECAUTIONS WHEN USING TECHSTREAM When using the Techstream with the ignition switch off to troubleshoot: Connect the Techstream to the vehicle, and turn the courtesy light switch on and off at 1.5-second intervals until communication between the Techstream and the vehicle begins. After all DTCs are cleared, check if the trouble occurs again 6 seconds after the ignition switch is turned to ON (IG).

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SYSTEM DESCRIPTION

1. ILLUMINATED ENTRY SYSTEM The illuminated entry system has the following control functions: Control Outline Lights that Operate Actuation Area-linked*1 When a registered key enters any actuation area around the doors, the lights that operate turn on. Power Switch Illumination Personal Light When a registered key leaves all of the actuation areas around the doors, the lights that operate turn off. Door Lock/Unlock-linked When any door is unlocked, the lights that operate turn on. Power Switch Illumination*1 Personal Light 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. Power Switch Illumination*1 Personal Light When all doors are closed, the lights that operate turn off. Power Switch-linked*1 When the power switch is turned from on (ACC or IG) to off, the lights that operate turn on. Power Switch Illumination Personal Light When the power switch is turned from off to on (ACC or IG), the lights that operate turn off. Ignition Switch-linked*2 When the ignition switch is turned from ON (IG) or ACC to off, the lights that operate turn on. Personal Light When the ignition switch is turned from off to ON (IG) or ACC, the lights that operate turn off. Delay When approximately 15 seconds elapse after any of the following conditions is met, the lights that operate turn off: An actuation area-linked function is used.*1 The door unlock-linked function is active. Any door is opened and then all doors are closed when the ignition switch is off. Power Switch Illumination*1 Personal Light Battery Saving When 20 minutes elapse after the ignition switch is turned from ACC or ON (IG) to off and the lights that operate remain on, the lights are turned off. HINT: Battery saving control is canceled when any of the following operations is performed before the lights are turned off by battery saving control. After the operation is performed, the lights remain on for another 20 minutes and then the lights are turned off. The ignition switch is turned to ACC or ON (IG) Any door is opened and closed The back door is opened and closed Any door is unlocked The key enters any exterior actuation area Power Switch Illumination*1 Personal Light Luggage Compartment Light*3 *1: w/ Smart Key System *2: w/o Smart Key System *3: w/ Luggage Compartment Light

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 ignition 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 A: Go to next step
5. PROBLEM SYMPTOMS TABLE Refer to problem symptoms table. Refer to «PROBLEM SYMPTOMS TABLE»(/toyota/prius-c/i-2011-2015/remont/interiorillumination-lights/#lighting-system-interior-diagnostics-circuit-tests__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»(/toyota/prius-c/i-2011-2015/remont/interiorillumination-lights/#lighting-system-interior-diagnostics-circuit-tests__data-list-active-test) Terminals of ECU. Refer to «TERMINALS OF ECU»(/toyota/prius-c/i-2011-2015/remont/interiorillumination-lights/#lighting-system-interior-diagnostics-circuit-tests) NEXT: Go to next step
7. ADJUST, REPAIR OR REPLACE NEXT: Go to next step
8. CONFIRMATION TEST NEXT --> END

OPERATION CHECK

1. INSPECT INTERIOR LIGHT CONTROL OPERATION NOTE: Perform this inspection with the customize parameters at the initial settings. HINT: The interior light control illuminates the lights below. Power Switch Illumination*1 Personal Light The operation and conditions 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 power switch is off and all doors are closed(*1,*2). Any door is unlocked when the ignition switch is off with all doors closed and locked. The ignition switch is turned from ON (IG) to off when all doors are closed. All doors are closed after any door is opened with the ignition switch off. Fade out immediately When any of the following conditions is met, the lights fade out immediately: The ignition switch is turned from off to ACC when all doors are closed. All doors are locked when the ignition switch is off, all doors are closed and any door is unlocked. All doors are locked again when all doors are already closed and locked. *1: w/ Smart Key System *2: When the lights are on, if the key leaves all of the actuation areas around the doors, after approximately 3 seconds, the lights fade out.
2. BATTERY SAVING CONTROL OPERATION NOTE: Perform this inspection with the customize parameters at the initial settings. HINT: The lights controlled by battery saving control are as follows: Power Switch Illumination*1 Personal Light Luggage Compartment Light*2 The operation and conditions of this control are described below. Operation Condition Battery saving When 20 minutes elapse after the ignition switch is turned from ACC or ON (IG) to off and the lights that operate remain on, the lights are turned off. HINT: Battery saving control is canceled when any of the following operations is performed before the lights are turned off by battery saving control. After the operation is performed, the lights remain on for another 20 minutes and then the lights are turned off. The ignition switch is turned to ACC or ON (IG) Any door is opened and closed The back door is opened and closed Any door is unlocked The key enters any exterior actuation area *1: w/ Smart Key System *2: w/ Luggage Compartment Light

CUSTOMIZE PARAMETERS

1. CUSTOMIZE LIGHTING SYSTEM (INT) Customizing using the Techstream HINT: The following items can be customized. NOTE: When the customer requests a change in a function, first make sure that the function can be customized. Be sure to make a note of the current settings before customizing. When troubleshooting a function, first make sure that the function is set to the default setting. Connect the Techstream to the DLC3. Turn the ignition switch to ON (IG). Turn the Techstream on. Enter the following menus: Customize Setting / Illuminated Entry. Select the setting by referring to the table below. ILLUMINATED ENTRY Tester Display Default Content Setting Relevant ECU Lighting Time 15 s Changes the lighting time after closing all of the doors. (The lights will fade out immediately in case of turning the ignition switch from off to ACC or ON (IG).) 7.5 s, 15 s or 30 s Main body ECU (Multiplex network body ECU) I/L when ACC OFF ON Lights up the power switch illumination*1 and personal light when the ignition switch is turned from ACC or ON (IG) to off. ON or OFF I/L ON W/Door Key Unlock ON Lights up the power switch illumination and personal light when doors are unlocked using a mechanical key or door control transmitter. ON or OFF Room Light when Aprchd*1 ON Lights up the power switch illumination and personal light when a key enters any actuation area around the doors. ON or OFF *1: w/ Smart Key System

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)

1. *1: w/ Smart Key System

BATTERY SAVING CONTROL

INTERIOR LIGHT POWER SOURCE CONTROL

1. *1: w/ Luggage Compartment Light

PERSONAL LIGHT

1. *1: w/ Luggage Compartment Light
2. *2: w/o Luggage Compartment Light

LUGGAGE COMPARTMENT ROOM LIGHT

INSTRUMENT PANEL ILLUMINATION

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1. CHECK INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY AND MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU) Disconnect the 3B, 3C and 3E instrument panel junction block assembly connectors. Measure the voltage according to the value(s) in the table below. Terminal No. Wiring Color Terminal Description Condition Specified Condition 3E-1 - Body ground B - Body ground Auxiliary battery power supply Ignition switch off 11 to 14 V 3C-21 - Body ground L - Body ground Auxiliary battery power supply Ignition 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 3B-8 - 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 3B, 3C and 3E instrument panel junction block assembly 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 3B-37 - Body ground L - Body ground ACC power supply Ignition switch ACC 11 to 14 V Ignition switch off Below 1 V 3A-29 - Body ground SB - Body ground IG power supply Ignition switch ON (IG) 11 to 14 V Ignition switch off Below 1 V 3A-40 - Body ground L - Body ground IG signal input Ignition switch ON (IG) 11 to 14 V Ignition switch off Below 1 V 3A-54 - Body ground Y - Body ground IG signal output Ignition switch ON (IG) 11 to 14 V Ignition switch off Below 1 V G59-15 (DOMR)- Body ground BR - Body ground DOME CUT relay drive output DOME CUT relay off 11 to 14 V DOME CUT relay on Below 1 V 3C-4 - Body ground G - Body ground Interior lights power supply DOME CUT relay off Below 1 V DOME CUT relay on 11 to 14 V 3A-5 - Body ground BE - Body ground Interior lights power supply DOME CUT relay off Below 1 V DOME CUT relay on 11 to 14 V 3B-6 - Body ground B - Body ground Interior lights drive output Ignition switch off, interior lights off (when operated by illuminated entry system) 11 to 14 V Ignition switch off, interior lights on (when operated by illuminated entry system) Below 1 V 3D-6 - Body ground*2 L - Body ground Luggage compartment room light power supply DOME CUT relay off Below 1 V DOME CUT relay on 11 to 14 V 3D-35 - Body ground B - Body ground Back door courtesy light switch input Back door open Below 1 V Back door closed 11 to 14 V 3D-36 - Body ground R - Body ground Front door courtesy light switch LH input Front door LH open Below 1 V Front door LH closed Pulse generation G59-19 (FRCY) - Body ground R - Body ground Front door courtesy light switch RH input Front door RH open Below 1 V Front door RH closed Pulse generation G59-1 (LCTY) - Body ground L - Body ground Rear door courtesy light switch LH input Rear door LH open Below 1 V Rear door LH closed Pulse generation G59-6 (RCTY) - Body ground G - Body ground Rear door courtesy light switch RH input Rear door RH open Below 1 V Rear door RH closed Pulse generation G59-7 (LSFL) - Body ground L - Body ground Front door unlock detection switch LH input Front door LH locked Pulse generation Front door LH unlocked Below 1 V G59-18 (LSFR) - Body ground L - Body ground Front door unlock detection switch RH input Front door RH locked Pulse generation Front door RH unlocked Below 1 V 3D-24 - Body ground*1 Y - Body ground Rear door unlock detection switch LH input Rear door LH and rear door RH locked Pulse generation Rear door LH or rear door RH unlocked Below 1 V 3D-25 - Body ground*1 V - Body ground Rear door unlock detection switch RH input Rear door LH and rear door RH locked Pulse generation Rear door LH or rear door RH unlocked Below 1 V *1: w/ Smart Key System *2: w/ Luggage compartment light If the result is not as specified, the main body ECU (multiplex network body ECU) or instrument panel junction block assembly may be malfunctioning.
2. CHECK CERTIFICATION ECU (SMART KEY ECU ASSEMBLY) Measure the voltage according to the value(s) in the table below. NOTE: Check that the light intensity of the light control rheostat is set to maximum. Terminal No. (Symbol) Wiring Color Terminal Description Condition Specified Condition G54-6 (SWIL) - G55-6 (AGND) R - B Power switch illumination drive output Power switch illumination on 11 to 14 V Power switch illumination off Below 1 V If the result is not as specified, the certification ECU (smart key ECU assembly) may be malfunctioning.

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»(/toyota/prius-c/i-2011-2015/remont/hoistjack/#introduction) .
3. INSPECT AUXILIARY BATTERY VOLTAGE Measure the auxiliary battery voltage with the ignition 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 ignition switch to 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 Ignition switch ACC signal/ON or OFF ON: Ignition switch ACC OFF: Ignition switch off - IG SW Ignition switch ON (IG) signal/ON or OFF ON: Ignition switch ON (IG) OFF: Ignition switch off - 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 - FR Door Lock Pos Front door RH unlock detection switch signal/LOCK or UNLOCK LOCK: Front door RH locked UNLOCK: Front door RH unlocked - FR Door Courtesy SW Front door courtesy light switch RH signal/ON or OFF ON: Front door RH open OFF: Front door RH closed - FL Door Lock Pos Front door LH unlock detection switch signal/LOCK or UNLOCK LOCK: Front door LH locked UNLOCK: Front door LH unlocked - FL Door Courtesy SW Front door courtesy light switch LH signal/ON or OFF ON: Front door LH open OFF: Front door LH closed - RR-Door Lock Pos SW*1 Rear door RH unlock detection switch signal/ON or OFF ON: Rear door LH locked and rear door RH unlocked ON: Rear door LH unlocked and rear door RH locked ON: Rear door LH and rear door RH unlocked OFF: Rear door LH and rear door RH locked - RL-Door Lock Pos SW*1 Rear door LH unlock detection switch/ON or OFF ON: Rear door LH locked and rear door RH unlocked ON: Rear door LH unlocked and rear door RH locked ON: Rear door LH and rear door RH unlocked OFF: Rear door LH and rear door RH locked - I/L ON W/Door Key Unlock Function that lights up the interior lights when the doors are unlocked/OFF or ON OFF: Function disabled ON: Function enabled Customized value is 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 is displayed Room Light when Aprchd*1 Function that lights up the interior lights when a key enters any actuation area/OFF or ON OFF: Function disabled ON: Function enabled Customized value is displayed I/L when ACC OFF Function that lights up the interior lights when the ignition switch is turned from ACC or ON (IG) to off/OFF or ON OFF: Function disabled ON: Function enabled Customized value is displayed *1: w/ Smart Key System
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 ignition switch to ON (IG). Turn the Techstream on. Enter the following menus: Body Electrical / (desired system) / 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 Personal light and power switch illumination*1 ON/OFF Interior light door switch DOOR Relay for Interior Light Auto Cut Function DOME CUT Relay ON/OFF - SMART KEY*1 Tester Display Test Part Control Range Diagnostic Note Power/Engine SW Light Power switch light OFF/ON When performing this Active Test, make sure the following condition is met: The power switch illumination is off (15 seconds or more have elapsed since it turned from on to off) and the power switch is on (ACC) or on (IG), or the hybrid control system is running. *1: w/ Smart Key System

DESCRIPTION

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

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INSPECTION PROCEDURE

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

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1. CHECK VEHICLE CONDITION Check the vehicle condition. RESULT Result Proceed to w/ Smart Key System A w/o Smart Key System B B --> See step 7 A: Go to next step
2. CHECK DTC (SMART KEY SYSTEM (for Start Function)) Check for DTCs. Refer to «DTC CHECK / CLEAR»(/toyota/prius-c/i-2011-2015/remont/starter/#smart-key-system-for-start-function-diagnostics-introduction__dtc-check-clear) . RESULT Result Proceed to DTC is not output A DTC is output B B --> See step 15 A: Go to next step
3. READ VALUE USING TECHSTREAM Connect the Techstream to the DLC3. Turn the ignition switch to 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 Ignition switch ON (IG) signal/ON or OFF ON: Ignition switch ON (IG) OFF: Ignition switch off - OK Normal conditions listed above are displayed. NG --> See step 4 OK --> See step 12
4. CHECK HARNESS AND CONNECTOR (DC/DC FUSE - INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY) Disconnect the 3E 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 3E-1 - Body ground Ignition switch off 11 to 14 V NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR OK: Go to next step
5. CHECK HARNESS AND CONNECTOR (INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY - INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY) Disconnect the 3A instrument panel junction block assembly connectors. Measure the resistance according to the value(s) in the table below. Standard Resistance Tester Connection Condition Specified Condition 3A-54 - 3A-40 Always Below 1 ohms 3A-54 - Body ground Always 10 kohms or higher NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR OK: Go to next step
6. INSPECT INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY Remove the instrument panel junction block assembly. Refer to «REMOVAL»(/toyota/prius-c/i-2011-2015/remont/body-electrical/#power-distribution-service-information) . 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) - - Standard Resistance Tester Connection Condition Specified Condition 3A-40 - MB-32 (IG) Always Below 1 ohms 3E-1 - 3A-54 Always 10 kohms or higher 3E-1 - 3A-54 Auxiliary battery positive (+) --> 3A-29 Auxiliary battery negative (-) --> 3B-8 Below 1 ohms NG --> See step 13 OK --> See step 14
7. READ VALUE USING TECHSTREAM Connect the Techstream to the DLC3. Turn the ignition switch to 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 Ignition switch ON (IG) signal/ON or OFF ON: Ignition switch ON (IG) OFF: Ignition switch off - OK Normal conditions listed above are displayed. NG --> See step 8 OK --> See step 12
8. CHECK HARNESS AND CONNECTOR (INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY - DC/DC FUSE AND BODY GROUND) Disconnect the 3B and 3E 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 3E-1 - Body ground Ignition 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 3B-8 - Body ground Always Below 1 ohms NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR OK: Go to next step
9. CHECK HARNESS AND CONNECTOR (INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY - INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY) Disconnect the 3A instrument panel junction block assembly connectors. Measure the resistance according to the value(s) in the table below. Standard Resistance Tester Connection Condition Specified Condition 3A-54 - 3A-40 Always Below 1 ohms 3A-54 - Body ground Always 10 kohms or higher NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR OK: Go to next step
10. INSPECT INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY Reconnect the 3A, 3B and 3E 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 3A-29 - Body ground Ignition switch ON (IG) 11 to 14 V *a Component with harness connected (Instrument panel junction block assembly) NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR OK: Go to next step
11. INSPECT INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY Remove the instrument panel junction block assembly. Refer to «REMOVAL»(/toyota/prius-c/i-2011-2015/remont/body-electrical/#power-distribution-service-information) . 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) - - Standard Resistance Tester Connection Condition Specified Condition 3A-40 - MB-32 (IG) Always Below 1 ohms 3E-1 - 3A-54 Always 10 kohms or higher 3E-1 - 3A-54 Auxiliary battery positive (+) --> 3A-29 Auxiliary battery negative (-) --> 3B-8 Below 1 ohms NG --> See step 13 OK --> See step 14
12. PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE. Refer to «PROBLEM SYMPTOMS TABLE»(/toyota/prius-c/i-2011-2015/remont/interiorillumination-lights/#lighting-system-interior-diagnostics-circuit-tests__problem-symptoms-table)
13. REPLACE INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY. Refer to «REMOVAL»(/toyota/prius-c/i-2011-2015/remont/body-electrical/#power-distribution-service-information)
14. REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU). Refer to «REMOVAL»(/toyota/prius-c/i-2011-2015/remont/body-electrical/#power-distribution-service-information)
15. GO TO SMART KEY SYSTEM (for Start Function). Refer to «DIAGNOSTIC TROUBLE CODE CHART»(/toyota/prius-c/i-2011-2015/remont/starter/#smart-key-system-for-start-function-diagnostics-introduction__diagnostic-trouble-code-chart)

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

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

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1. CHECK VEHICLE CONDITION Check the vehicle condition. RESULT Result Proceed to w/ Smart Key System A w/o Smart Key System B B --> See step 6 A: Go to next step
2. CHECK DTC (SMART KEY SYSTEM (for Start Function)) Check for DTCs. Refer to «DTC CHECK / CLEAR»(/toyota/prius-c/i-2011-2015/remont/starter/#smart-key-system-for-start-function-diagnostics-introduction__dtc-check-clear) . RESULT Result Proceed to DTC is not output A DTC is output B B --> See step 13 A: Go to next step
3. READ VALUE USING TECHSTREAM Connect the Techstream to the DLC3. Turn the ignition switch to 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 Ignition switch ACC signal/ON or OFF ON: Ignition switch ACC OFF: Ignition switch off - OK Normal conditions listed above are displayed. NG --> See step 4 OK --> See step 10
4. CHECK HARNESS AND CONNECTOR (DC/DC FUSE - INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY) Disconnect the 3E 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 3E-1 - Body ground Ignition switch off 11 to 14 V NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR OK: Go to next step
5. INSPECT INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY Remove the instrument panel junction block assembly. Refer to «REMOVAL»(/toyota/prius-c/i-2011-2015/remont/body-electrical/#power-distribution-service-information) . 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) - - Standard Resistance Tester Connection Condition Specified Condition 3E-1 - MB-29 (ACC) Always 10 kohms or higher 3E-1 - MB-29 (ACC) Auxiliary battery positive (+) --> 3B-37 Auxiliary battery negative (-) --> 3B-8 Below 1 ohms NG --> See step 11 OK --> See step 12
6. READ VALUE USING TECHSTREAM Connect the Techstream to the DLC3. Turn the ignition switch to 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 Ignition switch ACC signal/ON or OFF ON: Ignition switch ACC OFF: Ignition switch off - OK Normal conditions listed above are displayed. NG --> See step 7 OK --> See step 10
7. CHECK HARNESS AND CONNECTOR (INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY - DC/DC FUSE AND BODY GROUND) Disconnect the 3E and 3B 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 3E-1 - Body ground Ignition 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 3B-8 - Body ground Always Below 1 ohms NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR OK: Go to next step
8. INSPECT INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY Reconnect the 3B and 3E 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 3B-37 - Body ground Ignition switch ACC 11 to 14 V *a Component with harness connected (Instrument panel junction block assembly) NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR OK: Go to next step
9. INSPECT INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY Remove the instrument panel junction block assembly. Refer to «REMOVAL»(/toyota/prius-c/i-2011-2015/remont/body-electrical/#power-distribution-service-information) . 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) - - Standard Resistance Tester Connection Condition Specified Condition 3E-1 - MB-29 (ACC) Always 10 kohms or higher 3E-1 - MB-29 (ACC) Auxiliary battery positive (+) --> 3B-37 Auxiliary battery negative (-) --> 3B-8 Below 1 ohms NG --> See step 11 OK --> See step 12
10. PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE. Refer to «PROBLEM SYMPTOMS TABLE»(/toyota/prius-c/i-2011-2015/remont/interiorillumination-lights/#lighting-system-interior-diagnostics-circuit-tests__problem-symptoms-table)
11. REPLACE INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY. Refer to «REMOVAL»(/toyota/prius-c/i-2011-2015/remont/body-electrical/#power-distribution-service-information)
12. REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU). Refer to «REMOVAL»(/toyota/prius-c/i-2011-2015/remont/body-electrical/#power-distribution-service-information)
13. GO TO SMART KEY SYSTEM (for Start Function). Refer to «DIAGNOSTIC TROUBLE CODE CHART»(/toyota/prius-c/i-2011-2015/remont/starter/#smart-key-system-for-start-function-diagnostics-introduction__diagnostic-trouble-code-chart)

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

Scheme 17

Scheme 18

1. READ VALUE USING TECHSTREAM Connect the Techstream to the DLC3. Turn the ignition switch to 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 FR Door Courtesy SW Front door courtesy light switch RH signal/ON or OFF ON: Front door RH open OFF: Front door RH closed - FL Door Courtesy SW Front door courtesy light switch LH signal/ON or OFF ON: Front door LH open OFF: Front door LH 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 B --> See step 2 A --> See step 7
2. INSPECT FRONT DOOR COURTESY LIGHT SWITCH ASSEMBLY (LH OR RH) Remove the front door courtesy light switch assembly. Refer to «REMOVAL»(/toyota/prius-c/i-2011-2015/remont/interiorillumination-lights/#lighting-system-interior-service-information) . Inspect the front door courtesy light switch assembly. Refer to «INSPECTION»(/toyota/prius-c/i-2011-2015/remont/interiorillumination-lights/#lighting-system-interior-service-information) . OK Front door courtesy light switch assembly is normal. Result Result Proceed to OK (for Front LH) A OK (for Front RH) B NG C B --> See step 5 C --> See step 6 A: Go to next step
3. CHECK HARNESS AND CONNECTOR (FRONT DOOR COURTESY LIGHT SWITCH ASSEMBLY LH - INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY) Disconnect the 3D instrument panel junction block assembly connector. Measure the resistance according to the value(s) in the table below. Standard Resistance Tester Connection Condition Specified Condition M1-1 - 3D-36 Always Below 1 ohms M1-1 - Body ground Always 10 kohms or higher NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR OK: Go to next step
4. INSPECT INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY Remove the instrument panel junction block assembly. Refer to «REMOVAL»(/toyota/prius-c/i-2011-2015/remont/body-electrical/#power-distribution-service-information) . 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) - - Standard Resistance Tester Connection Condition Specified Condition 3D-36 - MB-2 (FLCY) Always Below 1 ohms NG --> See step 9 OK --> See step 8
5. CHECK HARNESS AND CONNECTOR (FRONT DOOR COURTESY LIGHT SWITCH ASSEMBLY RH - MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU)) Disconnect the G59 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 M2-1 - G59-19 (FRCY) Always Below 1 ohms M2-1 - 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»(/toyota/prius-c/i-2011-2015/remont/interiorillumination-lights/#lighting-system-interior-service-information)
7. PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE. Refer to «PROBLEM SYMPTOMS TABLE»(/toyota/prius-c/i-2011-2015/remont/interiorillumination-lights/#lighting-system-interior-diagnostics-circuit-tests__problem-symptoms-table)
8. REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU). Refer to «REMOVAL»(/toyota/prius-c/i-2011-2015/remont/body-electrical/#power-distribution-service-information)
9. REPLACE INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY. Refer to «REMOVAL»(/toyota/prius-c/i-2011-2015/remont/body-electrical/#power-distribution-service-information)

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

Scheme 19

PROCEDURE

1. READ VALUE USING TECHSTREAM Connect the Techstream to the DLC3. Turn the ignition switch to 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 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 - OK Normal conditions listed above are displayed. Result Result Proceed to OK A Rear door courtesy light switch LH or RH does not operate B B --> See step 2 A --> See step 5
2. INSPECT REAR DOOR COURTESY LIGHT SWITCH ASSEMBLY (LH OR RH) Remove the rear door courtesy light switch assembly. Refer to «REMOVAL»(/toyota/prius-c/i-2011-2015/remont/interiorillumination-lights/#lighting-system-interior-service-information) . Inspect the rear door courtesy light switch assembly. Refer to «INSPECTION»(/toyota/prius-c/i-2011-2015/remont/interiorillumination-lights/#lighting-system-interior-service-information) . OK Rear door courtesy light switch assembly is normal. Result Result Proceed to OK (for Rear LH) A OK (for Rear RH) B NG C B --> See step 4 C --> See step 7 A: Go to next step
3. CHECK HARNESS AND CONNECTOR (REAR DOOR COURTESY LIGHT SWITCH ASSEMBLY LH - MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU)) Disconnect the G59 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 M3-1 - G59-1 (LCTY) Always Below 1 ohms M3-1 - Body ground Always 10 kohms or higher NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR OK --> See step 6
4. CHECK HARNESS AND CONNECTOR (REAR DOOR COURTESY LIGHT SWITCH ASSEMBLY RH - MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU)) Disconnect the G59 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 M4-1 - G59-6 (RCTY) Always Below 1 ohms M4-1 - Body ground Always 10 kohms or higher NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR OK --> See step 6
5. PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE. Refer to «PROBLEM SYMPTOMS TABLE»(/toyota/prius-c/i-2011-2015/remont/interiorillumination-lights/#lighting-system-interior-diagnostics-circuit-tests__problem-symptoms-table)
6. REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU). Refer to «REMOVAL»(/toyota/prius-c/i-2011-2015/remont/body-electrical/#power-distribution-service-information)
7. REPLACE REAR DOOR COURTESY LIGHT SWITCH ASSEMBLY. Refer to «REMOVAL»(/toyota/prius-c/i-2011-2015/remont/interiorillumination-lights/#lighting-system-interior-service-information)

The main body ECU (multiplex network body ECU) detects the condition of the back door lock assembly using this circuit.

Scheme 20

Scheme 21

1. READ VALUE USING TECHSTREAM Connect the Techstream to the DLC3. Turn the ignition switch to 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 Back Door 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. NG --> See step 2 OK --> See step 5
2. INSPECT BACK DOOR LOCK ASSEMBLY Remove the back door lock assembly. Refer to «REMOVAL»(/toyota/prius-c/i-2011-2015/remont/door-locks-anti-theft-systems/#door-lock-system-service-information) . Inspect the back door lock assembly. Refer to «INSPECTION»(/toyota/prius-c/i-2011-2015/remont/door-locks-anti-theft-systems/#door-lock-system-service-information) . OK Back door lock assembly is normal. NG --> See step 7 OK: Go to next step
3. CHECK HARNESS AND CONNECTOR (BACK DOOR LOCK ASSEMBLY - INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY AND BODY GROUND) Disconnect the 3D instrument panel junction block assembly connector. Measure the resistance according to the value(s) in the table below. Standard Resistance Tester Connection Condition Specified Condition T5-3 (D+) - 3D-35 Always Below 1 ohms T5-3 (D+) - Body ground Always 10 kohms or higher T5-2 (ACT-) - Body ground Always Below 1 ohms NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR OK: Go to next step
4. INSPECT INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY Remove the instrument panel junction block assembly. Refer to «REMOVAL»(/toyota/prius-c/i-2011-2015/remont/body-electrical/#power-distribution-service-information) . 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) - - Standard Resistance Tester Connection Condition Specified Condition 3D-35 - MB-20 (BCTY) Always Below 1 ohms NG --> See step 8 OK --> See step 6
5. PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE. Refer to «PROBLEM SYMPTOMS TABLE»(/toyota/prius-c/i-2011-2015/remont/interiorillumination-lights/#lighting-system-interior-diagnostics-circuit-tests__problem-symptoms-table)
6. REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU). Refer to «REMOVAL»(/toyota/prius-c/i-2011-2015/remont/body-electrical/#power-distribution-service-information)
7. REPLACE BACK DOOR LOCK ASSEMBLY. Refer to «REMOVAL»(/toyota/prius-c/i-2011-2015/remont/door-locks-anti-theft-systems/#door-lock-system-service-information)
8. REPLACE INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY. Refer to «REMOVAL»(/toyota/prius-c/i-2011-2015/remont/body-electrical/#power-distribution-service-information)

The main body ECU (multiplex network body ECU) controls the operation of the following lights

1. Personal Light

HINT

The DOME CUT relay supplies power to the lights not controlled by the illuminated entry system. If all the lights that use power from the DOME CUT relay do not turn on, check the DOME CUT relay circuit first. Refer to PROBLEM SYMPTOMS TABLE .

Scheme 22

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

Scheme 23

1. PERFORM ACTIVE TEST USING TECHSTREAM Connect the Techstream to the DLC3. Turn the ignition switch to 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 Personal light ON/OFF Interior light door switch DOOR OK Each light fades in. NG --> See step 2 OK --> See step 6
2. INSPECT MAP LIGHT ASSEMBLY Remove the map light assembly. Refer to «REMOVAL»(/toyota/prius-c/i-2011-2015/remont/interiorillumination-lights/#lighting-system-interior-service-information__removal) . Inspect the map light assembly. Refer to «INSPECTION»(/toyota/prius-c/i-2011-2015/remont/interiorillumination-lights/#lighting-system-interior-service-information__inspection) . OK Map light assembly is normal. NG --> See step 8 OK: Go to next step
3. CHECK HARNESS AND CONNECTOR (MAP LIGHT ASSEMBLY - INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY) Disconnect the 3B instrument panel junction block assembly connector. Measure the resistance according to the value(s) in the table below. Standard Resistance Tester Connection Condition Specified Condition Q1-2 (CTY) - 3B-6*1 Always Below 1 ohms Q1-2 (CTY) - Body ground*1 Always 10 kohms or higher Q2-2 (CTY) - 3B-6*2 Always Below 1 ohms Q2-2 (CTY) - Body ground*2 Always 10 kohms or higher *1: w/o Sliding Roof *2: w/ Sliding Roof NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR OK: Go to next step
4. INSPECT INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY Remove the instrument panel junction block assembly. Refer to «REMOVAL»(/toyota/prius-c/i-2011-2015/remont/body-electrical/#power-distribution-service-information) . 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) - - Standard Resistance Tester Connection Condition Specified Condition 3B-6 - MB-1 (ILE) Always Below 1 ohms NG --> See step 7 OK --> See step 5
5. REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU). Refer to «REMOVAL»(/toyota/prius-c/i-2011-2015/remont/body-electrical/#power-distribution-service-information)
6. PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE. Refer to «PROBLEM SYMPTOMS TABLE»(/toyota/prius-c/i-2011-2015/remont/interiorillumination-lights/#lighting-system-interior-diagnostics-circuit-tests__problem-symptoms-table)
7. REPLACE INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY. Refer to «REMOVAL»(/toyota/prius-c/i-2011-2015/remont/body-electrical/#power-distribution-service-information)
8. REPLACE MAP LIGHT ASSEMBLY. Refer to «REMOVAL»(/toyota/prius-c/i-2011-2015/remont/interiorillumination-lights/#lighting-system-interior-service-information__removal)

When battery saving control operates while the interior lights are on, the main body ECU (multiplex network body ECU) opens the DOME CUT relay to turn off the lights.

Scheme 24

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

Scheme 25

1. PERFORM ACTIVE TEST USING TECHSTREAM Connect the Techstream to the DLC3. Turn the ignition switch to ON (IG). Turn the Techstream on. Enter the following menus: Body Electrical / Main Body / Active Test. Check that the relay operates. MAIN BODY Tester Display Test Part Control Range Diagnostic Note Relay for Interior Light Auto Cut Function DOME CUT Relay ON/OFF - OK Dome cut relay operates. NG --> See step 2 OK --> See step 4
2. INSPECT DOME CUT RELAY Remove the DOME CUT relay from the No. 2 engine room relay block and No. 2 junction block assembly. Measure the resistance according to the value(s) in the table below. Standard Resistance Tester Connection Condition Specified Condition 3 - 5 Voltage is not applied between terminals 1 and 2 10 kohms or higher 3 - 5 Voltage is applied between terminals 1 and 2 Below 1 ohms TEXT IN ILLUSTRATION *a Component without harness connected (DOME CUT Relay) NG --> REPLACE DOME CUT RELAY OK: Go to next step
3. CHECK HARNESS AND CONNECTOR (DOME CUT RELAY - MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU)) Disconnect the G59 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 Relay terminal 1 - G59-15 (DOMR) Always Below 1 ohms Relay terminal 1 - Body ground Always 10 kohms or higher NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR OK --> See step 5
4. PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE. Refer to «PROBLEM SYMPTOMS TABLE»(/toyota/prius-c/i-2011-2015/remont/interiorillumination-lights/#lighting-system-interior-diagnostics-circuit-tests__problem-symptoms-table)
5. REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU). Refer to «REMOVAL»(/toyota/prius-c/i-2011-2015/remont/body-electrical/#power-distribution-service-information)

The main body ECU (multiplex network body ECU) controls operation of the DOME CUT relay in order to supply power to the interior lights.

Scheme 26

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

Scheme 27

Scheme 28

1. INSPECT DOME CUT RELAY Remove the DOME CUT relay from the No. 2 engine room relay block and No. 2 junction block assembly. Measure the resistance according to the value(s) in the table below. Standard Resistance Tester Connection Condition Specified Condition 3 - 5 Voltage is not applied between terminals 1 and 2 10 kohms or higher 3 - 5 Voltage is applied between terminals 1 and 2 Below 1 ohms TEXT IN ILLUSTRATION *a Component without harness connected (DOME CUT Relay) NG --> REPLACE DOME CUT RELAY OK: Go to next step
2. CHECK HARNESS AND CONNECTOR (AUXILIARY BATTERY - DOME CUT RELAY) Measure the voltage according to the value(s) in the table below. Standard Voltage Tester Connection Switch Condition Specified Condition Relay Terminal 2 - Body ground Ignition switch off 11 to 14 V Relay Terminal 5 - Body ground Ignition switch off 11 to 14 V NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR OK: Go to next step
3. CHECK HARNESS AND CONNECTOR (DOME CUT RELAY - INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY) Disconnect the 3C instrument panel junction block assembly connector. Measure the resistance according to the value(s) in the table below. Standard Resistance Tester Connection Switch Condition Specified Condition Relay Terminal 3 - 3C-4 Always Below 1 ohms Relay Terminal 3 - Body ground Always 10 kohms or higher NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR OK: Go to next step
4. CHECK HARNESS AND CONNECTOR (DOME CUT RELAY - MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU)) Disconnect the G59 main body ECU (multiplex network body ECU) connector. Measure the resistance according to the value(s) in the table below. Standard Resistance Tester Connection Switch Condition Specified Condition Relay Terminal 1 - G59-15 (DOMR) Always Below 1 ohms Relay Terminal 1 - Body ground Always 10 kohms or higher RESULT Result Proceed to OK (w/o Luggage Compartment Light) A OK (w/ Luggage Compartment Light) B NG C B --> See step 8 C --> REPAIR OR REPLACE HARNESS OR CONNECTOR A: Go to next step
5. INSPECT INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY Remove the instrument panel junction block assembly. Refer to «REMOVAL»(/toyota/prius-c/i-2011-2015/remont/body-electrical/#power-distribution-service-information) . 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) - - Standard Resistance Tester Connection Switch Condition Specified Condition 3C-4 - 3A-5 Always Below 1 ohms NG --> See step 10 OK: Go to next step
6. INSPECT MAP LIGHT ASSEMBLY Remove the map light assembly. Refer to «REMOVAL»(/toyota/prius-c/i-2011-2015/remont/interiorillumination-lights/#lighting-system-interior-service-information__removal) . Inspect the map light assembly. Refer to «INSPECTION»(/toyota/prius-c/i-2011-2015/remont/interiorillumination-lights/#lighting-system-interior-service-information__inspection) . OK Map light assembly is normal. NG --> See step 11 OK: Go to next step
7. CHECK HARNESS AND CONNECTOR (MAP LIGHT ASSEMBLY - INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY AND BODY GROUND) Disconnect the 3A instrument panel junction block assembly connector. Measure the resistance according to the value(s) in the table below. Standard Resistance Tester Connection Switch Condition Specified Condition Q1-3 (B) - 3A-5*1 Always Below 1 ohms Q1-3 (B) - Body ground*1 Always 10 kohms or higher Q1-1 (E) - Body ground*1 Always Below 1 ohms Q2-3 (B) - 3A-5*2 Always Below 1 ohms Q2-3 (B) - Body ground*2 Always 10 kohms or higher Q2-1 (E) - Body ground*2 Always Below 1 ohms *1: w/o Sliding Roof *2: w/ Sliding Roof NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR OK --> See step 9
8. INSPECT INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY Remove the instrument panel junction block assembly. Refer to «REMOVAL»(/toyota/prius-c/i-2011-2015/remont/body-electrical/#power-distribution-service-information) . 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) - - Standard Resistance Tester Connection Switch Condition Specified Condition 3C-4 - MB-3 (BCYL) Always Below 1 ohms 3A-5 - MB-3 (BCYL) Always Below 1 ohms 3D-6 - MB-4 (BCTL) Always Below 1 ohms NG --> See step 10 OK --> See step 9
9. PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE. Refer to «PROBLEM SYMPTOMS TABLE»(/toyota/prius-c/i-2011-2015/remont/interiorillumination-lights/#lighting-system-interior-diagnostics-circuit-tests__problem-symptoms-table)
10. REPLACE INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY. Refer to «REMOVAL»(/toyota/prius-c/i-2011-2015/remont/body-electrical/#power-distribution-service-information)
11. REPLACE MAP LIGHT ASSEMBLY. Refer to «REMOVAL»(/toyota/prius-c/i-2011-2015/remont/interiorillumination-lights/#lighting-system-interior-service-information__removal)

The illuminated entry system controls the power switch illumination.

Scheme 29

Note. Check that the light intensity of the light control rheostat is set to maximum.

1. PERFORM ACTIVE TEST USING TECHSTREAM Connect the Techstream to the DLC3. Turn the ignition switch to ON (IG). Turn the Techstream on. Enter the following menus: Body Electrical / Smart Key / Active Test. Check that the illumination operates. SMART KEY Tester Display Test Part Control Range Diagnostic Note Power/Engine SW Light Power switch light OFF/ON When performing this Active Test, make sure the following condition is met: The power switch illumination is off (15 seconds or more have elapsed since it turned from on to off) and the power switch is on (ACC) or on (IG), or the hybrid control system is running. OK Power switch illumination comes on. NG --> See step 2 OK --> See step 5
2. INSPECT POWER SWITCH Remove the power switch. Refer to «REMOVAL»(/toyota/prius-c/i-2011-2015/remont/starter/#starting-system-service-information) . Inspect the power switch. Refer to «INSPECTION»(/toyota/prius-c/i-2011-2015/remont/starter/#starting-system-service-information) . OK Power switch illumination comes on. NG --> See step 4 OK: Go to next step
3. CHECK HARNESS AND CONNECTOR (POWER SWITCH - CERTIFICATION ECU (SMART KEY ECU ASSEMBLY)) Disconnect the G54 and G55 certification ECU (smart key ECU assembly) connector. Measure the resistance according to the value(s) in the table below. Standard Resistance Tester Connection Condition Specified Condition G48-9 (SWIL) - G54-6 (SWIL) Always Below 1 ohms G48-6 (AGND) - G55-6 (AGND) Always Below 1 ohms G48-9 (SWIL) - Body ground Always 10 kohms or higher G48-6 (AGND) - Body ground Always 10 kohms or higher NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR OK --> See step 6
4. REPLACE POWER SWITCH. Refer to «REMOVAL»(/toyota/prius-c/i-2011-2015/remont/starter/#starting-system-service-information)
5. PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE. Refer to «PROBLEM SYMPTOMS TABLE»(/toyota/prius-c/i-2011-2015/remont/interiorillumination-lights/#lighting-system-interior-diagnostics-circuit-tests__problem-symptoms-table)
6. REPLACE CERTIFICATION ECU (SMART KEY ECU ASSEMBLY). Refer to «REMOVAL»(/toyota/prius-c/i-2011-2015/remont/door-locks-anti-theft-systems/#theft-deterrent-system-keyless-entry-system-service-information)

The main body ECU (multiplex network body ECU) detects the condition of each door unlock detection switch.

Scheme 30

Scheme 31

1. READ VALUE USING TECHSTREAM Connect the Techstream to the DLC3. Turn the ignition switch to 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 FR Door Lock Pos Front door RH unlock detection switch signal/LOCK or UNLOCK LOCK: Front door RH locked UNLOCK: Front door RH unlocked - FL Door Lock Pos Front door LH unlock detection switch signal/LOCK or UNLOCK LOCK: Front door LH locked UNLOCK: Front door LH unlocked - RR-Door Lock Pos SW*1 Rear door RH unlock detection switch signal/ON or OFF ON: Rear door LH locked and rear door RH unlocked ON: Rear door LH unlocked and rear door RH locked ON: Rear door LH and rear door RH unlocked OFF: Rear door LH and rear door RH locked - RL-Door Lock Pos SW*1 Rear door LH unlock detection switch/ON or OFF ON: Rear door LH locked and rear door RH unlocked ON: Rear door LH unlocked and rear door RH locked ON: Rear door LH and rear door RH unlocked OFF: Rear door LH and rear door RH locked - *1: w/ Smart Key System Result Result Proceed to OK A Front door unlock detection switch LH does not operate B Front door unlock detection switch RH does not operate C Rear door unlock detection switch LH and rear door unlock detection switch RH do not operate D B --> See step 2 C --> See step 4 D --> See step 6 A --> See step 11
2. INSPECT FRONT DOOR LOCK ASSEMBLY LH Remove the front door lock assembly LH. Refer to «REMOVAL»(/toyota/prius-c/i-2011-2015/remont/door-locks-anti-theft-systems/#door-lock-system-service-information) . Inspect the front door lock assembly LH. Refer to «INSPECTION»(/toyota/prius-c/i-2011-2015/remont/door-locks-anti-theft-systems/#door-lock-system-service-information) . OK Front door lock assembly LH is normal. NG --> See step 12 OK: Go to next step
3. CHECK HARNESS AND CONNECTOR (FRONT DOOR LOCK ASSEMBLY LH - MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU) AND BODY GROUND) Disconnect the G59 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 J6-8 (LSSR) - G59-7 (LSFL) Always Below 1 ohms J6-8 (LSSR) - Body ground Always 10 kohms or higher J6-7 (E) - Body ground Always Below 1 ohms NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR OK --> See step 16
4. INSPECT FRONT DOOR LOCK ASSEMBLY RH Remove the front door lock assembly RH. Refer to «REMOVAL»(/toyota/prius-c/i-2011-2015/remont/door-locks-anti-theft-systems/#door-lock-system-service-information) . Inspect the front door lock assembly RH. Refer to «INSPECTION»(/toyota/prius-c/i-2011-2015/remont/door-locks-anti-theft-systems/#door-lock-system-service-information) . OK Front door lock assembly RH is normal. NG --> See step 13 OK: Go to next step
5. CHECK HARNESS AND CONNECTOR (FRONT DOOR LOCK ASSEMBLY RH - MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU) AND BODY GROUND) Disconnect the G59 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 H6-7 (LSSR) - G59-18 (LSFR) Always Below 1 ohms H6-7 (LSSR) - Body ground Always 10 kohms or higher H6-8 (E) - Body ground Always Below 1 ohms NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR OK --> See step 16
6. INSPECT REAR DOOR LOCK ASSEMBLY LH Remove the rear door lock assembly LH. Refer to «REMOVAL»(/toyota/prius-c/i-2011-2015/remont/door-locks-anti-theft-systems/#door-lock-system-service-information) . Inspect the rear door lock assembly LH. Refer to «INSPECTION»(/toyota/prius-c/i-2011-2015/remont/door-locks-anti-theft-systems/#door-lock-system-service-information) . OK Rear door lock assembly LH is normal. NG --> See step 14 OK: Go to next step
7. CHECK HARNESS AND CONNECTOR (REAR DOOR LOCK ASSEMBLY LH - INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY AND BODY GROUND) Disconnect the 3D instrument panel junction block assembly connector. Measure the resistance according to the value(s) in the table below. Standard Resistance Tester Connection Condition Specified Condition L3-6 (LSSR) - 3D-24 Always Below 1 ohms L3-6 (LSSR) - Body ground Always 10 kohms or higher L3-9 (E) - Body ground Always Below 1 ohms NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR OK: Go to next step
8. INSPECT REAR DOOR LOCK ASSEMBLY RH Remove the rear door lock assembly RH. Refer to «REMOVAL»(/toyota/prius-c/i-2011-2015/remont/door-locks-anti-theft-systems/#door-lock-system-service-information) . Inspect the rear door lock assembly RH. Refer to «INSPECTION»(/toyota/prius-c/i-2011-2015/remont/door-locks-anti-theft-systems/#door-lock-system-service-information) . OK Rear door lock assembly RH is normal. NG --> See step 15 OK: Go to next step
9. CHECK HARNESS AND CONNECTOR (REAR DOOR LOCK ASSEMBLY RH - INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY AND BODY GROUND) Disconnect the 3D instrument panel junction block assembly connector. Measure the resistance according to the value(s) in the table below. Standard Resistance Tester Connection Condition Specified Condition K3-6 (LSSR) - 3D-25 Always Below 1 ohms K3-6 (LSSR) - Body ground Always 10 kohms or higher K3-9 (E) - Body ground Always Below 1 ohms NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR OK: Go to next step
10. INSPECT INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY Remove the instrument panel junction block assembly. Refer to «REMOVAL»(/toyota/prius-c/i-2011-2015/remont/body-electrical/#power-distribution-service-information) . 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) - - Standard Resistance Tester Connection Condition Specified Condition 3D-24 - MB-5 (LSR) Always Below 1 ohms 3D-25 - MB-5 (LSR) Always Below 1 ohms NG --> See step 17 OK --> See step 16
11. PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE. Refer to «PROBLEM SYMPTOMS TABLE»(/toyota/prius-c/i-2011-2015/remont/interiorillumination-lights/#lighting-system-interior-diagnostics-circuit-tests__problem-symptoms-table)
12. REPLACE FRONT DOOR LOCK ASSEMBLY LH. Refer to «REMOVAL»(/toyota/prius-c/i-2011-2015/remont/door-locks-anti-theft-systems/#door-lock-system-service-information)
13. REPLACE FRONT DOOR LOCK ASSEMBLY RH. Refer to «REMOVAL»(/toyota/prius-c/i-2011-2015/remont/door-locks-anti-theft-systems/#door-lock-system-service-information)
14. REPLACE REAR DOOR LOCK ASSEMBLY LH. Refer to «REMOVAL»(/toyota/prius-c/i-2011-2015/remont/door-locks-anti-theft-systems/#door-lock-system-service-information)
15. REPLACE REAR DOOR LOCK ASSEMBLY RH. Refer to «REMOVAL»(/toyota/prius-c/i-2011-2015/remont/door-locks-anti-theft-systems/#door-lock-system-service-information)
16. REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU). Refer to «REMOVAL»(/toyota/prius-c/i-2011-2015/remont/body-electrical/#power-distribution-service-information)
17. REPLACE INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY. Refer to «REMOVAL»(/toyota/prius-c/i-2011-2015/remont/body-electrical/#power-distribution-service-information)

See also:
• INITIALIZATION
• REMOVAL
• DIAGNOSIS SYSTEM
• REMOVAL
• INSPECTION
• INSPECTION
• GENERAL INFORMATION
• DTC CHECK / CLEAR
• DIAGNOSTIC TROUBLE CODE CHART
• REMOVAL
• REMOVAL
• REMOVAL
• PROBLEM SYMPTOMS TABLE
• DATA LIST / ACTIVE TEST
• TERMINALS OF ECU