Wiper System / Washer System (Diagnostics & Circuit Tests) (Base): Overview Toyota Prius Plug-in

SYSTEM DESCRIPTION

1. HEADLIGHT CLEANER SYSTEM General The headlight cleaner system operates when the headlight cleaner switch is pushed ON. The headlight cleaner system also operates when the front washer switch is first operated with the headlights on.

DESCRIPTION

The headlight cleaner control relay receives the windshield washer operation signal.

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1. CHECK OPERATION Check the operation of the front wiper and washer system. OK Front wiper and washer system operates normally. NG --> See step 4 OK: Go to next step
2. CHECK HARNESS AND CONNECTOR (WINDSHIELD WIPER SWITCH ASSEMBLY - RELAY) Disconnect the A44 headlight cleaner control relay connector. Measure the voltage according to the value(s) in the table below. Standard Voltage Tester Connection Condition Specified Condition A44-5 (FRWA) - Body ground Front washer switch off 11 to 14 V Front washer switch on Below 1 V TEXT IN ILLUSTRATION *1 Front view of wire harness connector (to Headlight Cleaner Control Relay) NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR OK --> See step 3
3. PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE. Refer to «PROBLEM SYMPTOMS TABLE»(ref-551570-S25481880172013051500000)
4. GO TO PROBLEM SYMPTOMS TABLE. Refer to «PROBLEM SYMPTOMS TABLE»(ref-551570-S25481880172013051500000)

The headlight cleaner control relay detects the low beam headlights status.

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This circuit detects the conditions (on or off) of the headlight cleaner switch assembly.

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1. INSPECT HEADLIGHT CLEANER CONTROL RELAY (H SIGNAL) Disconnect the A44 headlight cleaner control relay connector. Measure the voltage according to the value(s) in the table below. Standard Voltage Tester Connection Switch Condition Specified Condition A44-2 (H) - Body ground Light control switch in head and headlight cleaner switch on 11 to 14 V A44-2 (H) - Body ground Headlight cleaner switch off Below 1 V TEXT IN ILLUSTRATION *1 Front view of wire harness connector (to Headlight Cleaner Control Relay) NG --> See step 2 OK --> See step 3
2. INSPECT HEADLIGHT CLEANER SWITCH ASSEMBLY Remove the headlight cleaner switch assembly. Refer to «COMPONENTS»(/toyota/prius-plug-in/2012-2014/remont/wiperwasher-systems/#wiper-system-washer-system-service-information-base) . Measure the resistance according to the value(s) in the table below. Standard Resistance Tester Connection Switch Condition Specified Condition 1 (E) - 4 (B) Headlight cleaner switch off 10 kohms or higher 1 (E) - 4 (B) Headlight cleaner switch on Below 1 ohms TEXT IN ILLUSTRATION *1 Component without harness connected (Headlight Cleaner Switch Assembly) NG --> See step 4 OK --> REPAIR OR REPLACE HARNESS OR CONNECTOR (MAIN BODY ECU - HEADLIGHT CLEANER CONTROL RELAY)
3. PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE. Refer to «PROBLEM SYMPTOMS TABLE»(ref-551570-S25481880172013051500000)
4. REPLACE HEADLIGHT CLEANER SWITCH ASSEMBLY. Refer to «COMPONENTS»(/toyota/prius-plug-in/2012-2014/remont/wiperwasher-systems/#wiper-system-washer-system-service-information-base)

The headlight cleaner control relay controls the headlight cleaner motor and pump assembly.

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1. INSPECT HEADLIGHT CLEANER MOTOR AND PUMP ASSEMBLY HINT: The following check should be performed with the headlight cleaner motor and pump assembly installed to the washer jar. Fill the washer jar with washer fluid. Connect a battery positive (+) lead to terminal 2 of the headlight cleaner motor and pump assembly, and a battery negative (-) lead to terminal 1. Check that washer fluid flows from the washer jar. OK Washer fluid is pumped from the washer jar. TEXT IN ILLUSTRATION *1 Component without harness connected (Headlight Cleaner Motor and Pump Assembly) NG --> See step 4 OK: Go to next step
2. CHECK HARNESS AND CONNECTOR (HEADLIGHT CLEANER MOTOR CIRCUIT) Connect the headlight cleaner motor and pump assembly connector. Disconnect the A44 headlight cleaner control relay connector. Measure the voltage according to the value(s) in the table below. Standard Voltage Tester Connection Condition Specified Condition A44-6 (PB) - Body ground Always 11 to 14 V TEXT IN ILLUSTRATION *1 Front view of wire harness connector (to Headlight Cleaner Control Relay) NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR (HEADLIGHT CLEANER CONTROL RELAY - BATTERY) OK --> See step 3
3. PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE. Refer to «PROBLEM SYMPTOMS TABLE»(ref-551570-S25481880172013051500000)
4. REPLACE HEADLIGHT CLEANER MOTOR AND PUMP ASSEMBLY. Refer to «COMPONENTS»(/toyota/prius-plug-in/2012-2014/remont/wiperwasher-systems/#wiper-system-washer-system-service-information-base)

This circuit provides power to the headlight cleaner control relay.

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1. CHECK HARNESS AND CONNECTOR (HEADLIGHT CLEANER CONTROL RELAY - BATTERY AND BODY GROUND) Disconnect the A44 headlight cleaner control relay connector. Measure the voltage according to the value(s) in the table below. Standard Voltage Tester Connection Condition Specified Condition A44-3 (IG) - Body ground Power switch off Below 1 V Power switch on (IG) 11 to 14 V Measure the resistance according to the value(s) in the table below. Standard Resistance Tester Connection Condition Specified Condition A44-4 (E) - Body ground Always Below 1 ohms TEXT IN ILLUSTRATION *1 Front view of wire harness connector (to Headlight Cleaner Control Relay) NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR OK --> See step 2
2. PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE. Refer to «PROBLEM SYMPTOMS TABLE»(ref-551570-S25481880172013051500000)

See also:
• INSPECTION
• COMPONENTS