WIPER AND WASHER SYSTEM TERMINALS OF ECU

CHECK WINDSHIELD WIPER SWITCH ASSEMBLY

1. Disconnect the K24 and K25 windshield wiper switch assembly connectors.

2. Measure the voltage and resistance on the wire harness side connector according to the value(s) in the table below.

   Terminal No. (Symbol)	Wiring Color	Terminal Description	Condition	Specified Condition
   K24-2 (+B) - Body ground	R - Body ground	Power switch on (IG) signal (Power source circuit)	Power switch on (IG)	11 to 14 V
   			Power switch off	Below 1 V
   K24-3 (TAIL) - Body ground*1	LG - Body ground	Headlight dimmer switch position signal	Power switch on (IG)	11 to 14 V
   			Power switch off	Below 1 V
   K24-4 (RLY2) - Body ground	R - Body ground	INT relay operation signal	Power switch on (IG)	11 to 14 V
   			Power switch off	Below 1 V
   K24-5 (RLY1) - Body ground	B - Body ground	WIP relay operation signal	Power switch on (IG)	11 to 14 V
   			Power switch off	Below 1 V
   K24-7 (E) - Body ground	BR - Body ground	Ground	Always	Below 1 Ω
   K25-4 (EW) - Body ground*2	W-B - Body ground	Ground	Always	Below 1 Ω
   K25-7 (EW) - Body ground*3	W-B - Body ground	Ground	Always	Below 1 Ω

   
   

   • *1: w/ Auto Wiper System

   • *2: for LHD, RHD (for Wiper Switch RH Side Type)

   • *3: for RHD (for Wiper Switch LH Side Type)

   Tip:

   If the result is not as specified, there may be a malfunction in the wire harness.

3. Reconnect the K24 and K25 windshield wiper switch assembly connectors.

4. 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
   K24-3 (TAIL) - Body ground*1	LG - Body ground	Headlight dimmer switch position signal	Power switch on (IG), headlight dimmer switch in off position	11 to 14 V
   			Power switch on (IG), headlight dimmer switch in on position	Below 1 V
   K24-4 (RLY2) - Body ground	R - Body ground	INT relay operation signal	Power switch on (IG), wiper switch off	11 to 14 V
   			Power switch on (IG), wiper switch in HI position	Below 1 V
   K24-5 (RLY1) - Body ground	B - Body ground	WIP relay operation signal	Power switch on (IG), wiper switch off	11 to 14 V
   			Power switch on (IG), wiper switch in LO position	Below 1 V
   K24-8 (MPX1) - Body ground*1	G - Body ground	LIN communication signal	Power switch on (IG)	Pulse generation
   K24-10 (CSS+) - K24-9 (CSS-)	R - L	Vehicle speed signal	Power switch on (IG), wheel being rotated	Pulse generation
   K24-20 (+S) - Body ground	G - Body ground	Wiper motor operation signal	Power switch on (IG), wiper switch off	11 to 14 V
   			Power switch on (IG), wiper switch in LO or HI position	Below 1 V
   K25-4 (WF) - Body ground*2	R - Body ground	Washer motor operation signal	Power switch on (IG), washer switch off	11 to 14 V
   			Power switch on (IG), washer switch on	Below 1 V
   K25-7 (WF) - Body ground*3	R - Body ground	Washer motor operation signal	Power switch on (IG), washer switch off	11 to 14 V
   			Power switch on (IG), washer switch on	Below 1 V

   
   

   • *1: w/ Auto Wiper System

   • *2: for RHD (for Wiper Switch LH Side Type)

   • *3: for LHD, RHD (for Wiper Switch RH Side Type)

   Tip:

   If the result is not as specified, the windshield wiper switch assembly may be malfunctioning.

CHECK HEADLIGHT CLEANER CONTROL RELAY

1. Disconnect the A48 headlight cleaner control relay connector.

2. Measure the voltage and resistance on the wire harness side connector according to the value(s) in the table below.

   Terminal No. (Symbol)	Wiring Color	Terminal Description	Condition	Specified Condition
   A48-3 (IG) - Body ground	B - Body ground	Power switch on (IG) signal (Power source circuit)	Power switch on (IG)	11 to 14 V
   			Power switch off	Below 1 V
   A48-4 (E) - Body ground	W-B - Body ground	Ground	Always	Below 1 Ω
   A48-6 (PB) - Body ground	W - Body ground	Headlight cleaner motor operation signal	Always	11 to 14 V

   Tip:

   If the result is not as specified, there may be a malfunction in the wire harness.

CHECK NO. 1 HEADLIGHT ECU SUB-ASSEMBLY RH

1. Measure the voltage according to the value(s) in the table below.

   Terminal No. (Symbol)	Wiring Color	Terminal Description	Condition	Specified Condition
   G1-18 (FRWA) - Body ground	R - Body ground	Washer switch operation signal	Power switch on (IG), washer switch off	5 V
   			Power switch on (IG), washer switch on	Below 1 V
   G1-7 (HLC) - Body ground	R - Body ground	Headlight cleaner operation signal	Power switch on (IG), headlight cleaner not operating	11 to 14 V
   			Power switch on (IG), headlight cleaner operating	Below 1 V

   Tip:

   If the result is not as specified, the headlight leveling ECU assembly may be malfunctioning.