Lighting System (Diagnostic Codes & Circuit Tests) (Base): Overview Toyota Prius Plug-in

DESCRIPTION

The automatic light control sensor detects ambient light, converts it into an electrical signal, and outputs it to the main body ECU (multiplex network body ECU). The main body ECU (multiplex network body ECU) turns on or off the headlights and taillights according to the signal.

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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 Illumination Rate Illumination rate information/0 ms to 99.99 ms Value is output according to ambient light levels - OK Normal condition listed above is displayed. NG --> See step 2 OK --> See step 5
2. CHECK HARNESS AND CONNECTOR (MAIN BODY ECU - AUTOMATIC LIGHT CONTROL SENSOR) Disconnect the I1 automatic light control sensor connector. Disconnect the L7 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 L7-22 (CLTE) - I1-6 (CLTE) Always Below 1 ohms L7-21 (CLTS) - I1-4 (CLTS) Always Below 1 ohms L7-20 (CLTB) - I1-3 (CLTB) Always Below 1 ohms L7-22 (CLTE) - Body ground Always 10 kohms or higher L7-21 (CLTS) - Body ground Always 10 kohms or higher L7-20 (CLTB) - Body ground Always 10 kohms or higher NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR OK: Go to next step
3. INSPECT MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU) Reconnect the L7 main body ECU (multiplex network body ECU) connector. Measure the voltage and resistance according to the value(s) in the table below. Standard Voltage Tester Connection Condition Specified Condition L7-20 (CLTB) - L7-22 (CLTE) Power switch off Below 1 V Power switch on (IG) 11 to 14 V Standard Resistance Tester Connection Condition Specified Condition L7-22 (CLTE) - Body ground Always Below 1 ohms TEXT IN ILLUSTRATION *1 Component with harness connected (Main Body ECU (Multiplex Network Body ECU)) NG --> See step 5 OK: Go to next step
4. INSPECT AUTOMATIC LIGHT CONTROL SENSOR Reconnect the I1 automatic light control sensor connector. Connect an oscilloscope to the automatic light control sensor connector. TEXT IN ILLUSTRATION *1 Component with harness connected (Automatic Light Control Sensor) Check the waveform. OK Tester Connection Tool Setting Condition Specified Condition I1-6 (CLTE) - I1-4 (CLTS) 5 V/DIV., 5 ms./DIV. Power switch on (IG), light control switch in AUTO position Correct waveform is as shown HINT: If the ambient light becomes brighter, width A becomes narrower. NG --> See step 6 OK --> See step 5
5. REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU). Refer to «REMOVAL»(/toyota/prius-plug-in/2012-2014/remont/body-electrical/#power-distribution-service-information-base)
6. REPLACE AUTOMATIC LIGHT CONTROL SENSOR. Refer to «REMOVAL»(ref-551554-S01995034412013051500000)

The DTC is stored when the headlight leveling ECU assembly detects malfunctions in the rear height control sensor sub-assembly RH power source or rear height control sensor sub-assembly RH.

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1. CHECK FOR DTC Clear the DTCs. Refer to «DTC CHECK / CLEAR»(ref-551401-S28912641282013051500000). Check for DTCs. Refer to «DTC CHECK / CLEAR»(ref-551401-S28912641282013051500000). OK DTC B2416 is not output. NG --> See step 2 OK --> See step 7
2. 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 / HL Auto Leveling / Data List. Read the display on the Techstream. HL AUTO LEVELING Tester Display Measurement Item/Range Normal Condition Diagnostic Note Height Sens Pw Supply Val Rear height control sensor power supply value / 0 to 5.00 V Approx. 5.0 V - OK Normal condition listed above is displayed. NG --> See step 3 OK --> See step 5
3. INSPECT REAR HEIGHT CONTROL SENSOR SUB-ASSEMBLY RH Connect 3 dry cell batteries (1.5 V) in series. Remove the rear height control sensor sub-assembly RH. Refer to «REMOVAL»(ref-551554-S15496835482013051500000). Connect the positive (+) lead from the batteries to terminal 3 (SHB) and the negative (-) lead from the batteries to terminal 1 (SHG). Measure the voltage between terminals 2 (SHRR) and 1 (SHG) while slowly moving the link up and down. Standard Voltage Tester Connection Condition Specified Condition 2 (SHRR) - 1 (SHG) +45° (High) 4.05 V 11.9° (Normal) 2.25 V -45° (Low) 0.45 V TEXT IN ILLUSTRATION *1 Component without harness connected (Rear Height Control Sensor Sub-assembly RH) NG --> See step 6 OK: Go to next step
4. CHECK HARNESS AND CONNECTOR (HEADLIGHT LEVELING ECU ASSEMBLY - HEIGHT CONTROL SENSOR) Disconnect the A48 headlight leveling ECU assembly connector. Disconnect the S3 rear height control sensor sub-assembly RH connector. Measure the resistance according to the value(s) in the table below. Standard Resistance Tester Connection Condition Specified Condition A48-12 (SBR) - S3-3 (SHB) Always Below 1 ohms A48-19 (SHRL) - S3-2 (SHRR) Always Below 1 ohms A48-21 (SGR) - S3-1 (SHG) Always Below 1 ohms A48-12 (SBR) - Body ground Always 10 kohms or higher A48-19 (SHRL) - Body ground Always 10 kohms or higher A48-21 (SGR) - Body ground Always 10 kohms or higher NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR OK --> See step 5
5. REPLACE HEADLIGHT LEVELING ECU ASSEMBLY. Refer to «REMOVAL»(/toyota/prius-plug-in/2012-2014/remont/body-electrical/#power-distribution-service-information-base)
6. REPLACE REAR HEIGHT CONTROL SENSOR SUB-ASSEMBLY RH. Refer to «REMOVAL»(ref-551554-S15496835482013051500000)
7. USE SIMULATION METHOD TO CHECK. Refer to «HOW TO PROCEED WITH TROUBLESHOOTING»(ref-551389-S26665480372013051500000)

The headlight leveling ECU assembly receives signals indicating the height of the vehicle from the rear height control sensor sub-assembly RH.

When the headlight leveling ECU assembly detects a malfunction in itself, the DTC is stored.

These DTCs are stored when the low beam headlights do not illuminate, or a malfunction is detected in the communication between the headlight assembly and main body ECU (multiplex network body ECU).

Scheme 160

The headlight leveling ECU assembly stores this DTC if initialization has not been performed after the ECU was replaced.

The headlight leveling ECU assembly stores this DTC if the sensor value received from the height control sensor is out of range when performing initialization of the headlight leveling ECU assembly; for example, the vehicle is not level or being jacked up.

The main body ECU (multiplex network body ECU) receives the following switch information

1. Light control switch position is off (DRL OFF), tail, head or AUTO (DRL)
2. Dimmer switch position is high, low or high flash (pass)
3. Front fog light switch position is on or off

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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 Dimmer Hi SW Dimmer switch high position signal/ON or OFF ON: Dimmer switch in high or high flash (pass) position OFF: Dimmer switch in low position - Passing Light SW Dimmer switch high flash (pass) position signal/ON or OFF ON: Dimmer switch in high flash (pass) position OFF: Dimmer switch not in high flash (pass) position - Front Fog Light SW Front fog light switch signal/ON or OFF ON: Front fog light switch on OFF: Front fog light switch off - Light Auto SW Light control switch AUTO*1 or DRL*2 position signal/ON or OFF ON: Light control switch in AUTO*1 or DRL*2 position OFF: Light control switch not in AUTO*1 or DRL*2 position - Headlight SW Light control switch head position signal/ON or OFF ON: Light control switch in head position OFF: Light control switch not in head position - Taillight SW Light control switch tail position signal/ON or OFF ON: Light control switch in tail or head position OFF: Light control switch in neither tail nor head position - *1: w/ Automatic Light Control *2: Light control switch w/ DRL position OK Normal conditions listed above are displayed. NG --> See step 2 OK --> See step 4
2. INSPECT HEADLIGHT DIMMER SWITCH ASSEMBLY HINT: Inspect the items that did not change as a result of monitoring the Data List. Remove the headlight dimmer switch assembly. Refer to «REMOVAL»(ref-551554-S01741134292013051500000). Measure the resistance according to the value(s) in the table below. Standard Resistance LIGHT CONTROL SWITCH (W/ AUTOMATIC LIGHT CONTROL) Tester Connection Switch Condition Specified Condition 18 (T) - 12 (EL) Light control switch off or DRL OFF 10 kohms or higher 19 (A) - 12 (EL) Light control switch off or DRL OFF 10 kohms or higher 20 (H) - 12 (EL) Light control switch off or DRL OFF 10 kohms or higher 18 (T) - 12 (EL) Light control switch in tail position Below 1 ohms 18 (T) - 12 (EL) Light control switch in head position Below 1 ohms 20 (H) - 12 (EL) Light control switch in head position Below 1 ohms 19 (A) - 12 (EL) Light control switch in AUTO position Below 1 ohms LIGHT CONTROL SWITCH (W/O AUTOMATIC LIGHT CONTROL) Tester Connection Switch Condition Specified Condition 18 (T) - 12 (EL) Light control switch off 10 kohms or higher 19 (A) - 12 (EL)*1 Light control switch off 10 kohms or higher 20 (H) - 12 (EL) Light control switch off 10 kohms or higher 18 (T) - 12 (EL) Light control switch in tail position Below 1 ohms 18 (T) - 12 (EL) Light control switch in head position Below 1 ohms 20 (H) - 12 (EL) Light control switch in head position Below 1 ohms 19 (A)*1 - 12 (EL) Light control switch in DRL position Below 1 ohms DIMMER SWITCH Tester Connection Switch Condition Specified Condition 11 (HU) - 12 (EL) Dimmer switch in low position 10 kohms or higher 11 (HU) - 12 (EL) Dimmer switch in high position Below 1 ohms 17 (HF) - 12 (EL) Dimmer switch in high flash position Below 1 ohms FRONT FOG LIGHT SWITCH*2 Tester Connection Switch Condition Specified Condition 4 (BFG) - 3 (LFG) Fog light switch off 10 kohms or higher 4 (BFG) - 3 (LFG) Fog light switch on Below 1 ohms *1: w/ Light control switch w/ DRL position *2: w/ Front Fog Light OK Headlight dimmer switch assembly is normal. TEXT IN ILLUSTRATION *1 Component without harness connected (Headlight Dimmer Switch Assembly) NG --> See step 5 OK: Go to next step
3. CHECK HARNESS AND CONNECTOR (MAIN BODY ECU - HEADLIGHT DIMMER SWITCH ASSEMBLY) Disconnect the L47 headlight dimmer switch assembly connector. Disconnect the L7 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 L47-4 (BFG)*1 - L7-27 (FFOG)*1 Always Below 1 ohms L47-11 (HU) - L7-5 (HU) Always Below 1 ohms L47-17 (HF) - L7-8 (HF) Always Below 1 ohms L47-18 (T) - L7-30 (TAIL) Always Below 1 ohms L47-19 (A)*2 - L7-28 (A)*2 Always Below 1 ohms L47-20 (H) - L7-29 (HEAD) Always Below 1 ohms L47-4 (BFG)*1 - Body ground Always 10 kohms or higher L47-11 (HU) - Body ground Always 10 kohms or higher L47-17 (HF) - Body ground Always 10 kohms or higher L47-18 (T) - Body ground Always 10 kohms or higher L47-19 (A)*2 - Body ground Always 10 kohms or higher L47-20 (H) - Body ground Always 10 kohms or higher L47-12 (EL) - Body ground Always Below 1 ohms L47-3 (LFG)*1 - Body ground Always Below 1 ohms *1: w/ Front Fog Light *2: w/ Automatic Light Control NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR OK --> See step 6
4. PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE. Refer to «PROBLEM SYMPTOMS TABLE»(ref-551401-S08511508372013051500000)
5. REPLACE HEADLIGHT DIMMER SWITCH ASSEMBLY. Refer to «REMOVAL»(ref-551554-S01741134292013051500000).
6. REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU). Refer to «REMOVAL»(/toyota/prius-plug-in/2012-2014/remont/body-electrical/#power-distribution-service-information-base)

The main body ECU (multiplex network body ECU) controls the daytime running lights.

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Scheme 164

1. for Canada
2. except Canada

The main body ECU (multiplex network body ECU) controls the front fog light relay.

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The power management control ECU controls the back-up lights.

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The headlight leveling ECU assembly detects the status of the low beam headlights.

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The main body ECU (multiplex network body ECU) detects the condition of the parking brake switch assembly.

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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 Parking Brake SW Parking brake switch signal/ON or OFF ON: Parking brake switch on OFF: Parking brake switch off - OK Normal conditions listed above are displayed. NG --> See step 2 OK --> See step 5
2. INSPECT PARKING BRAKE SWITCH ASSEMBLY Remove the parking brake switch assembly. Refer to «REMOVAL»(ref-551587-S35182751142013051500000). Measure the resistance according to the value(s) in the table below. Standard Resistance Tester Connection Condition Specified Condition 1 - Switch body Shaft pushed in (OFF) 10 kohms or higher 1 - Switch body Shaft not pushed in (ON) Below 1 ohms NG --> See step 6 OK: Go to next step
3. CHECK HARNESS AND CONNECTOR (SWITCH - INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY) Disconnect the 2C instrument panel junction block assembly connector. Disconnect the A25 parking brake switch assembly connector. Measure the resistance according to the value(s) in the table below. Standard Resistance Tester Connection Condition Specified Condition A25-1 - 2C-20 Always Below 1 ohms A25-1 - 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. Measure the resistance according to the value(s) in the table below. Standard Resistance Tester Connection Condition Specified Condition 2C-20 - A-12 (PKB) Always Below 1 ohms 2C-20 - Body ground Always 10 kohms or higher TEXT IN ILLUSTRATION *1 Component without harness connected (Instrument Panel Junction Block Assembly) NG --> REPLACE INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY OK --> See step 7
5. PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE. Refer to «PROBLEM SYMPTOMS TABLE»(ref-551401-S08511508372013051500000)
6. REPLACE PARKING BRAKE SWITCH ASSEMBLY. Refer to «REMOVAL»(ref-551587-S35182751142013051500000)
7. REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU). Refer to «REMOVAL»(/toyota/prius-plug-in/2012-2014/remont/body-electrical/#power-distribution-service-information-base)

The main body ECU (multiplex network body ECU) controls the operation of the TAIL relay.

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This circuit detects the state of the power switch, and sends it to the headlight leveling ECU assembly.

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The headlight leveling ECU assembly actuates the headlight leveling motor according to vehicle conditions.

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The headlight leveling ECU assembly receives the vehicle speed signal from the combination meter assembly.

HINT

1. A voltage of 12 V or 5 V is output from each ECU and then input to the combination meter. The signal is changed to a pulse signal at the transistor in the combination meter. Each ECU controls the respective system based on the pulse signal.
2. If a short occurs in any of the ECUs or in the wire harness connected to an ECU, all systems in the diagram below will not operate normally.

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1. for 2ZR-FXE

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1. CHECK COMBINATION METER SYSTEM The circuits that send vehicle speed signals to this system are inspected in the meter information. Refer to «Speed Signal Circuit»(ref-551586-S19557789222013051500000). During inspection for the meter system, if there is an instruction that indicates to go back to inspections for the lighting system, proceed to the next step. NEXT: Go to next step
2. CHECK HARNESS AND CONNECTOR (HEADLIGHT LEVELING ECU ASSEMBLY - COMBINATION METER ASSEMBLY) Disconnect the L27 combination meter assembly connector. Disconnect the A48 headlight leveling ECU assembly connector. Measure the resistance according to the value(s) in the table below. Standard Resistance Tester Connection Condition Specified Condition A48-16 (SPDR) - L27-7 (+S) Always Below 1 ohms NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR OK: Go to next step
3. INSPECT NO. 3 METER CIRCUIT PLATE (OUTPUT WAVEFORM) Check the output waveform. Remove the combination meter assembly with the connector still connected. Connect an oscilloscope to terminal L27-7 (+S) and body ground. Turn the power switch on (IG). Check the signal waveform according to the condition(s) in the table below. Item Condition Tool setting 5 V/DIV., 20 ms./DIV. Vehicle condition Driving at approx. 20 km/h (12 mph) OK The waveform is displayed as shown in the illustration. TEXT IN ILLUSTRATION *1 Component with harness connected (Combination Meter Assembly) HINT: When the system is functioning normally, one wheel revolution generates 4 pulses. As the vehicle speed increases, the width indicated by (A) in the illustration narrows. NG --> See step 5 OK --> See step 4
4. PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE. Refer to «PROBLEM SYMPTOMS TABLE»(ref-551401-S08511508372013051500000)
5. REPLACE NO. 3 METER CIRCUIT PLATE. Refer to «DISASSEMBLY»(ref-551538-S14054080882013051500000)

The headlight beam level control system indicator light in the combination meter assembly comes on for approximately 3 seconds when the power switch is turned on (IG). The indicator light also comes on when the headlight leveling ECU assembly detects a malfunction.

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1. CHECK HARNESS AND CONNECTOR (BATTERY - COMBINATION METER ASSEMBLY) Disconnect the L27 combination meter assembly connector. Measure the voltage according to the value(s) in the table below. Standard Voltage Tester Connection Switch Condition Specified Condition L27-19 (IG+) - Body ground Power switch on (IG) 11 to 14 V Power switch off Below 1 V TEXT IN ILLUSTRATION *1 Front view of wire harness connector (to Combination Meter Assembly) NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR OK: Go to next step
2. CHECK HARNESS AND CONNECTOR (COMBINATION METER ASSEMBLY - HEADLIGHT LEVELING ECU ASSEMBLY) Disconnect the A48 headlight leveling ECU assembly connector. Measure the resistance according to the value(s) in the table below. Standard Resistance Tester Connection Condition Specified Condition A48-6 (WNG) - L27-6 (LVWG) Always Below 1 ohms A48-6 (WNG) - Body ground Always 10 kohms or higher NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR OK: Go to next step
3. INSPECT NO. 3 METER CIRCUIT PLATE Reconnect the L27 combination meter assembly connector. Measure the voltage according to the value(s) in the table below. Standard Voltage Tester Connection Switch Condition Specified Condition L27-6 (LVWG) - Body ground Power switch on (IG) 11 to 14 V TEXT IN ILLUSTRATION *1 Component with harness connected (Combination Meter Assembly) NG --> See step 4 OK --> See step 5
4. REPLACE NO. 3 METER CIRCUIT PLATE. Refer to «DISASSEMBLY»(ref-551538-S14054080882013051500000)
5. PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE. Refer to «PROBLEM SYMPTOMS TABLE»(ref-551401-S08511508372013051500000)

1. By connecting terminals LVL and CG of the DLC3, the headlight leveling ECU assembly initializes the height control sensor signal.

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The headlight leveling ECU assembly outputs DTC information to the Techstream via this circuit.

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The main body ECU (multiplex network body ECU) controls the headlight relays located within the integration relay.

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The main body ECU (multiplex network body ECU) controls the high beam headlights.

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Scheme 185

1. for Canada
2. except Canada

See also:
• REMOVAL