Solar Ventilation System (Diagnostics & Circuit Tests) (Base): Diagnosis Toyota Prius Plug-in

HOW TO PROCEED WITH TROUBLESHOOTING

HINT

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

1. VEHICLE BROUGHT TO WORKSHOP NEXT: Go to next step
2. INSPECT BATTERY VOLTAGE Inspect the battery voltage with the power switch off. Standard Voltage 11 to 14 V If the voltage is below 11 V, recharge or replace the battery before proceeding to the next step. NEXT: Go to next step
3. CHECK FOR DTC* Check for DTCs and note any code that is output. Clear the DTCs. Recheck for DTCs. Result Result Proceed to DTC is not output. A DTC is output. B B --> GO TO RELEVANT SYSTEM A: Go to next step
4. PROBLEM SYMPTOMS TABLE Refer to Problem Symptoms Table. Refer to «PROBLEM SYMPTOMS TABLE»(ref-551634-S15930460602013051500000) . 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 5 A: Go to next step
5. OVERALL ANALYSIS AND TROUBLESHOOTING* Terminals of ECU. Refer to «TERMINALS OF ECU»(ref-551634-S28935769372013051500000) Data List / Active Test. Refer to «DATA LIST / ACTIVE TEST»(ref-551634-S06735969682013051500000) Operation Check. Refer to «OPERATION CHECK»(ref-551634-S09729056292013051500000) Inspection NEXT: Go to next step
6. ADJUST, REPAIR OR REPLACE NEXT --> END

Scheme 191

1. SOLAR VENTILATION SYSTEM OPERATION CHECK Inspection of Voltage Generated by Moon Roof Glass Assembly (Solar Panel) Park the vehicle in a location with a stable temperature and a sufficient amount of sunlight, and leave the vehicle as is for approximately 10 minutes. NOTE: To ensure stable generation of voltage by the moon roof glass assembly (solar panel), make sure to park the vehicle in a location where the system operation conditions reference table are satisfied. HINT: The solar ventilation system operates only when the generated voltage is 10 V or higher. Therefore, make sure to park the vehicle where the system operation conditions reference table are satisfied. This will allow the moon roof glass assembly (solar panel) to generate a voltage of 10 V or higher. SYSTEM OPERATION CONDITIONS REFERENCE TABLE Item Condition Amount of sunlight A sufficient amount of sunlight is received by the moon roof glass assembly (solar panel). (The amount of sunlight on a cloudless day between 11:00 and 14:00 is typically sufficient for operation.) Moon roof glass assembly (solar panel) status The moon roof glass assembly (solar panel) is not in the shade No fallen leaves or dirt is present on the moon roof glass assembly (solar panel) Ambient temperature 20 to 40°C (68 to 104°F) Connect the Techstream to the DLC3. Turn the power switch on (IG). Turn the Techstream on. Enter the following menus: Body Electrical / Air Conditioner / Data List. AIR CONDITIONER Tester Display Measurement Item/Range Normal Condition Diagnostic Note Solar Voltage Solar panel voltage / Variable, 10V les, 10V-11V, 11V-12V, 12V-13V, 13V-14V, 14V-15V, 15V-16V, 16V-17V, 17V-18V, 18V-19V, 19V-20V, 20V-21V, 21V-22V, 22V-23V or 23V ovr Actual generated voltage displayed System operation conditions reference table are met. Refer to «SYSTEM DESCRIPTION»(ref-551634-S17247647462013051500000) . HINT: If the Data List items related to the solar ventilation system are not displayed, the following conditions are suspected: The voltage generated by the moon roof glass assembly (solar panel) is less than 7 V. Refer to «Solar Ventilation ECU Power Source Circuit»(ref-551634-S30327422452013051500000) . There is a communication error between the solar ventilation ECU and A/C amplifier. Refer to «Communication Circuit between Solar Ventilation ECU and A/C Amplifier»(ref-551634-S09158485452013051500000) . Operation Check Check that the Solar Voltage value in the Data List is 10 V or higher. Turn the solar ventilation switch on. Turn the power switch off. Check that the blower motor operates 10 minutes after the power switch is turned off. HINT: The inlets will be changed to fresh air mode and the outlets will be changed to face mode approximately 1 minute after the power switch is turned off. Inlet and outlet modes will remain unchanged when the solar ventilation switch is turned on after the power switch is turned off. When the moon roof glass assembly (solar panel) is generating high voltage, a noise may occur when the blower motor starts operating. This noise does not indicate a malfunction. For details of the solar ventilation system control, refer to System Description. Refer to «SYSTEM DESCRIPTION»(ref-551634-S17247647462013051500000) .
2. TEST MODE HINT: In test mode, the solar ventilation ECU operates the blower motor while the power switch is on (IG). The state of the solar ventilation switch received by the solar ventilation ECU and the status of duty output from the solar ventilation ECU to the blower motor can be checked. Test Mode Procedure HINT: Perform the operation according to the following procedure with the power switch on (IG) and the solar ventilation switch off. Check that the Solar Voltage value in the Data List is 10 V or higher. With the power switch on (IG), turn the power switch from off to on (ACC) to on (IG) 3 times within 5 seconds (on (IG) --> off --> on (ACC) --> on (IG) --> off --> on (ACC) --> on (IG) --> off --> on (ACC) --> on (IG)). HINT: Operate the power switch 9 times. Turn the solar ventilation switch from off to on 3 times within 3 seconds (off --> on --> off --> on --> off --> on) of operating the power switch. HINT: Operate the solar ventilation switch 5 times. Check that test mode is activated and the blower motor rotates at a constant speed. HINT: When the solar ventilation switch is turned off, the blower motor will stop and when the solar ventilation switch is turned on, the blower motor will operate. When the power switch is turned off, the solar ventilation system returns to normal control.

PROBLEM SYMPTOMS TABLE

HINT

1. 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.
2. Inspect the fuses and relays related to this system before inspecting the suspected areas below.

SOLAR VENTILATION SYSTEM

Scheme 192

Scheme 193

Scheme 194

1. SOLAR VENTILATION ECU HINT: Check from the rear of the connector while it is connected to the solar ventilation ECU. Terminal No. (Symbol) Wiring Color Terminal Description Condition Specified Condition L22-1 (GND) - Body ground W-B - Body ground Ground Always Below 1 V L22-5 (BLW) - L22-1 (GND) V - W-B Blower motor control signal Power switch off Solar ventilation switch: on (blower motor operating) Pulse generation (See waveform 1 (Scheme 193) ) L22-11 (SBI) - L22-1 (GND) G - W-B Solar panel voltage Always (System operation conditions reference table met. Refer to «SYSTEM DESCRIPTION»(ref-551634-S17247647462013051500000) ) 1 to 28 V L22-12 (BLWB) - L22-1 (GND) R - W-B Blower motor power source Power switch off Solar ventilation switch: on (System operation conditions reference table met. Refer to «SYSTEM DESCRIPTION»(ref-551634-S17247647462013051500000) ) 1 to 28 V L22-13 (PVSW) - L22-1 (GND) P - W-B Solar ventilation switch signal Solar ventilation switch: off 4.5 to 5.5 V Solar ventilation switch: on Below 1 V L22-14 (PVSO) - L22-1 (GND) P - W-B Solar ventilation switch status signal Solar ventilation switch: off 4.5 to 5.5 V Solar ventilation switch: on Below 1 V L22-17 (SIND) - L22-1 (GND) L - W-B Solar ventilation ECU status signal Power switch on (IG) SBI terminal: 7 V or higher Solar ventilation system: off Pulse generation (See waveform 2 (Scheme 194) ) L22-25 (IG) - L22-1 (GND) G - W-B Power switch status signal Power switch off Below 1 V Power switch on (IG) 11 to 14 V Waveform 1: Item Content Terminal No. L22-5 (BLW) - L22-1 (GND) Tool Setting 1 V/DIV., 500 μs/DIV. Vehicle Condition Power switch off Solar ventilation switch: on (blower motor operating) HINT: The waveform varies with the blower speed. Waveform 2: Item Content Terminal No. L22-17 (SIND) - L22-1 (GND) Tool Setting 1 V/DIV., 100 ms/DIV. Vehicle Condition Power switch on (IG) SBI terminal: 7 V or higher Solar ventilation system: off HINT: The waveform varies with the communication content.
2. A/C AMPLIFIER

DATA LIST / ACTIVE TEST

1. DATA LIST 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 table below, 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 / Air Conditioner / Data List. Check the value(s) by referring to the table below. AIR CONDITIONER Tester Display Measurement Item/Range Normal Condition Diagnostic Note Solar Ventilation Switch Solar ventilation switch (Switch recognition value at A/C amplifier side) / OFF or ON OFF: Solar ventilation switch off ON: Solar ventilation switch on - Solar Voltage Solar panel voltage / Variable, 10V les, 10V-11V, 11V-12V, 12V-13V, 13V-14V, 14V-15V, 15V-16V, 16V-17V, 17V-18V, 18V-19V, 19V-20V, 20V-21V, 21V-22V, 22V-23V or 23V ovr Actual generated voltage displayed System operation conditions reference table are met. Refer to «SYSTEM DESCRIPTION»(ref-551634-S17247647462013051500000) . Solar Ventilation Switch Status Solar ventilation switch (Switch recognition value at solar ventilation ECU side) / OFF or ON OFF: Solar ventilation switch off ON: Solar ventilation switch on - Solar IG Status Solar ventilation ECU IG status / OFF or ON OFF: Power switch off ON: Power switch on (IG) When OFF is displayed, a malfunction in the solar ventilation ECU is suspected. Solar Ventilation Test Mode Status Solar ventilation ECU test mode status / OFF or ON OFF: Test mode off ON: Test mode on - HINT: If the Data List items related to the solar ventilation system are not displayed, the following conditions are suspected: The voltage generated by the moon roof glass assembly (solar panel) is less than 7 V. Refer to «Solar Ventilation ECU Power Source Circuit»(ref-551634-S30327422452013051500000) . There is a communication error between the solar ventilation ECU and A/C amplifier. Refer to «Communication Circuit between Solar Ventilation ECU and A/C Amplifier»(ref-551634-S09158485452013051500000) .
2. ACTIVE TEST 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 / Air Conditioner / Active Test. Check the operation by referring to the table below. AIR CONDITIONER Tester Display Test Part Control Range Diagnostic Note Blower Motor Blower motor Min.: 0, Max.: 31

INSPECTION PROCEDURE

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

HINT

Before performing this inspection procedure, check if the Data List items for the solar ventilation system are displayed. If the Data List items are not displayed, inspect the communication circuit between the solar ventilation ECU and A/C amplifier. Refer to Communication Circuit between Solar Ventilation ECU and A/C Amplifier .

Scheme 195

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 / Air Conditioner / Data List. Check the value(s) by referring to the table below. AIR CONDITIONER Tester Display Measurement Item/Range Normal Condition Diagnostic Note Solar IG Status Solar ventilation ECU IG status / OFF or ON OFF: Power switch off ON: Power switch on (IG) When OFF is displayed, a malfunction in the solar ventilation ECU is suspected. OK The display is as specified in the Normal Condition column. Result Result Proceed to NG A OK (When troubleshooting according to Problem Symptoms Table (for Solar Ventilation System)) B OK (When troubleshooting according to Problem Symptoms Table (for Air Conditioning System)) C B --> See step 3 C --> See step 5 A: Go to next step
2. CHECK HARNESS AND CONNECTOR (SOLAR VENTILATION ECU - BATTERY) Disconnect the solar ventilation ECU connector. Measure the voltage according to the value(s) in the table below. Standard Voltage Tester Connection Condition Specified Condition L22-25 (IG) - Body ground Power switch off Below 1 V L22-25 (IG) - Body ground Power switch on (IG) 11 to 14 V TEXT IN ILLUSTRATION *1 Front view of wire harness connector (to Solar Ventilation ECU) NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR OK --> See step 4
3. PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE. Refer to «PROBLEM SYMPTOMS TABLE»(ref-551634-S15930460602013051500000)
4. REPLACE SOLAR VENTILATION ECU. Refer to «REMOVAL»(ref-551524-S15436463202013051500000)
5. PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE. Refer to «PROBLEM SYMPTOMS TABLE»(ref-551393-S01699272352013051500000)

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

Scheme 196

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Scheme 199

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Scheme 201

Scheme 202

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 / Air Conditioner / Active Test. Check the operation by referring to the table below. AIR CONDITIONER Tester Display Test Part Control Range Diagnostic Note Blower Motor Blower motor Min.: 0, Max.: 31 - OK Blower motor operates and blower motor speed level changes. NG --> See step 10 OK: Go to next step
2. INSPECT SOLAR VENTILATION RELAY Remove the solar ventilation relay. Measure the resistance according to the value(s) in the table below. Standard Resistance Tester Connection Specified Condition 3 - 5 10 kohms or higher 3 - 4 Below 1 ohms 3 - 5 Below 1 ohms (when battery voltage is applied to terminals 1 and 2) 3 - 4 10 kohms or higher (when battery voltage is applied to terminals 1 and 2) NG --> REPLACE SOLAR VENTILATION RELAY OK: Go to next step
3. INSPECT SOLAR VENTILATION ECU Disconnect the solar ventilation relay connector. Measure the voltage according to the value(s) in the table below. Standard Voltage Tester Connection Condition Specified Condition L104-4 - Body ground Power switch off Solar ventilation switch off Below 1 V L104-4 - Body ground Power switch off Solar ventilation switch on (System operation conditions reference table met. Refer to «SYSTEM DESCRIPTION»(ref-551634-S17247647462013051500000) ) 1 to 28 V TEXT IN ILLUSTRATION *1 Front view of wire harness connector (to Solar Ventilation Relay) NG --> See step 7 OK: Go to next step
4. CHECK HARNESS AND CONNECTOR (SOLAR VENTILATION ECU - BLOWER MOTOR) Disconnect the solar ventilation ECU connector. Disconnect the blower motor connector. Measure the resistance according to the value(s) in the table below. Standard Resistance Tester Connection Condition Specified Condition L22-5 (BLW) - L33-2 (SI) Always Below 1 ohms L22-5 (BLW) - Body ground Always 10 kohms or higher TEXT IN ILLUSTRATION *1 Front view of wire harness connector (to Solar Ventilation ECU) *2 Front view of wire harness connector (to Blower Motor) NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR OK: Go to next step
5. INSPECT SOLAR VENTILATION ECU Reinstall the solar ventilation relay. Reconnect the solar ventilation relay connector. Reconnect the blower motor connector. Reconnect the solar ventilation ECU connector. Measure the waveform between terminal L22-5 (BLW) of the solar ventilation ECU and body ground. Item Content Tool setting 1 V/DIV., 500 μs/DIV. Vehicle condition Power switch off Solar ventilation switch on (blower motor operating) OK Waveform is as shown in the illustration. HINT: The waveform varies with the blower speed. TEXT IN ILLUSTRATION *1 Component with harness connected (Solar Ventilation ECU) NG --> See step 6 OK --> See step 8
6. REPLACE BLOWER MOTOR Replace the blower motor with a known good one and check if the same problem occurs again. Refer to «REMOVAL»(ref-551524-S32848959262013051500000) . OK Same problem does not occur. NG --> See step 9 OK --> END (BLOWER MOTOR WAS DEFECTIVE)
7. CHECK HARNESS AND CONNECTOR (SOLAR VENTILATION ECU - SOLAR VENTILATION RELAY) Disconnect the solar ventilation ECU connector. Measure the resistance according to the value(s) in the table below. Standard Resistance Tester Connection Condition Specified Condition L22-12 (BLWB) - L104-4 Always Below 1 ohms L22-12 (BLWB) - Body ground Always 10 kohms or higher TEXT IN ILLUSTRATION *1 Front view of wire harness connector (to Solar Ventilation ECU) *2 Front view of wire harness connector (to Solar Ventilation Relay) NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR OK --> See step 9
8. PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE. Refer to «PROBLEM SYMPTOMS TABLE»(ref-551634-S15930460602013051500000)
9. REPLACE SOLAR VENTILATION ECU. Refer to «REMOVAL»(ref-551524-S15436463202013051500000)
10. GO TO AIR CONDITIONING SYSTEM (BLOWER MOTOR CIRCUIT). Refer to «Blower Motor Circuit»(ref-551550-S01368084362013051500000)

HINT

Before performing this inspection procedure, check if the Data List items for the solar ventilation system are displayed. If the Data List items are not displayed, inspect the communication circuit between the solar ventilation ECU and A/C amplifier. Refer to Communication Circuit between Solar Ventilation ECU and A/C Amplifier .

Scheme 203

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Scheme 208

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 / Air Conditioner / Data List. Check the value(s) by referring to the table below. AIR CONDITIONER Tester Display Measurement Item/Range Normal Condition Diagnostic Note Solar Ventilation Switch Solar ventilation switch (Switch recognition value at A/C amplifier side) / OFF or ON OFF: Solar ventilation switch off ON: Solar ventilation switch on - Solar Ventilation Switch Status Solar ventilation switch (Switch recognition value at solar ventilation ECU side) / OFF or ON OFF: Solar ventilation switch off ON: Solar ventilation switch on - OK The display is as specified in the Normal Condition column. Result Result Proceed to OK A NG (OFF/ON display does not change for both Solar Ventilation Switch Status and Solar Ventilation Switch even though the solar ventilation switch is operated.) B NG (OFF/ON display does not change for Solar Ventilation Switch even though the solar ventilation switch is operated.) C NG (OFF/ON display does not change for Solar Ventilation Switch Status even though the solar ventilation switch is operated.) D B --> See step 2 C --> See step 5 D --> See step 9 A --> See step 7
2. INSPECT SOLAR VENTILATION SWITCH Remove the solar ventilation switch. Measure the resistance according to the value(s) in the table below. Standard Resistance Tester Connection Condition Specified Condition L66-9 (SW+) - L66-6 (SW-) Solar ventilation switch: off (when switch is not pressed) 10 kohms or higher L66-9 (SW+) - L66-6 (SW-) Solar ventilation switch: on (when switch is pressed) Below 1 ohms TEXT IN ILLUSTRATION *1 Component without harness connected (Solar Ventilation Switch) NG --> See step 8 OK: Go to next step
3. CHECK HARNESS AND CONNECTOR (SOLAR VENTILATION SWITCH - BODY GROUND) Measure the resistance according to the value(s) in the table below. Standard Resistance Tester Connection Condition Specified Condition L66-6 (SW-) - Body ground Always Below 1 ohms TEXT IN ILLUSTRATION *1 Front view of wire harness connector (to Solar Ventilation Switch) NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR OK: Go to next step
4. CHECK HARNESS AND CONNECTOR (SOLAR VENTILATION SWITCH - SOLAR VENTILATION ECU) Disconnect the solar ventilation ECU connector. Measure the resistance according to the value(s) in the table below. Standard Resistance Tester Connection Condition Specified Condition L22-13 (PVSW) - L66-9 (SW+) Always Below 1 ohms L22-13 (PVSW) - Body ground Always 10 kohms or higher TEXT IN ILLUSTRATION *1 Front view of wire harness connector (to Solar Ventilation ECU) *2 Front view of wire harness connector (to Solar Ventilation Switch) NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR OK --> See step 9
5. CHECK HARNESS AND CONNECTOR (SOLAR VENTILATION ECU - A/C AMPLIFIER) Disconnect the A/C amplifier connector. Measure the resistance according to the value(s) in the table below. Standard Resistance Tester Connection Condition Specified Condition L17-25 (PVSW) - L22-14 (PVSO) Always Below 1 ohms L17-25 (PVSW) - Body ground Always 10 kohms or higher TEXT IN ILLUSTRATION *1 Front view of wire harness connector (to A/C Amplifier) *2 Front view of wire harness connector (to Solar Ventilation ECU) NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR OK: Go to next step
6. REPLACE SOLAR VENTILATION ECU Replace the solar ventilation ECU with a known good one and check if the same problem occurs again. Refer to «REMOVAL»(ref-551524-S15436463202013051500000) . OK Same problem does not occur. NG --> See step 10 OK --> END (SOLAR VENTILATION ECU WAS DEFECTIVE)
7. PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE. Refer to «PROBLEM SYMPTOMS TABLE»(ref-551634-S15930460602013051500000)
8. REPLACE SOLAR VENTILATION SWITCH. Refer to «REMOVAL»(ref-551524-S42640770052013051500000)
9. REPLACE SOLAR VENTILATION ECU. Refer to «REMOVAL»(ref-551524-S15436463202013051500000)
10. REPLACE A/C AMPLIFIER. Refer to «REMOVAL»(ref-551524-S30583713662013051500000)