Wiper Switch: Inspection

1. Check the front wiper switch.
   1. Measure the resistance according to the value(s) in the table below.

   Standard Resistance 

   STANDARD RESISTANCE REFERENCE
   
   

   Tester Connection	Switch Condition	Specified Condition
   E14-1 (+S) - E14-3 (+1)	INT	Below 1 Ω
   	OFF
   E14-2 (+B) - E14-3 (+1)	MIST
   	LO
   E14-2 (+B) - E14-4 (+2)	HI

   If the result is not as specified, replace the switch assembly.

2. Check the front washer switch.
   1. Measure the resistance according to the value(s) in the table below.

   Standard Resistance 

   STANDARD RESISTANCE REFERENCE
   
   

   Tester Connection	Switch Condition	Specified Condition
   E13-2 (EW) - E13-3 (WF)	ON	Below 1 Ω
   	OFF	10 kΩ or higher

   If the result is not as specified, replace the switch assembly.

   Fig 1: Identifying Front Washer Switch Connector Terminals

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
3. Check the intermittent operation (w/o Intermittent timing adjustment).
   1. Connect a voltmeter's positive (+) lead to terminal E14-3 (+1) and the negative (-) lead to terminal E13-2 (EW).
   2. Connect a battery positive (+) lead to terminal E14-2 (+B) and the negative (-) lead to terminals E13-2 (EW) and E14-1 (+S).
   3. Turn the wiper switch to the INT position.
   4. Connect a battery positive (+) lead to terminal E14-1 (+S) for 5 seconds.
   5. Connect a battery negative (-) lead to terminal E14-1 (+S). Operate the intermittent wiper relay and check the voltage between terminals E14-3 (+1) and E13-2 (EW).

      OK: 

      Voltage changes as shown in the illustration below  .

      Fig 2: Front Washer Switch Connector Terminals Voltage Graph (w/o Intermittent Timing Adjustment)

      Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      If the result is not as specified, replace the switch assembly.

4. Check the intermittent operation (w/ Intermittent timing adjustment).
   1. Connect a voltmeter's positive (+) lead to terminal E14-3 (+1) and the negative (-) lead to terminal E13-2 (EW).
   2. Connect a battery positive (+) lead to terminal E14-2 (+B) and the negative (-) lead to terminals E13-2 (EW) and E14-1 (+S).
   3. Turn the wiper switch to the INT position.
   4. Connect a battery positive (+) lead to terminal E14-1 (+S) for 5 seconds.
   5. Connect a battery negative (-) lead to terminal E14-1 (+S). Operate the intermittent wiper relay and check the voltage between terminals E14-3 (+1) and E13-2 (EW).

      OK: 

      Voltage changes as shown in the illustration below  .

      Fig 3: Front Washer Switch Connector Terminals Voltage Graph (w/ Intermittent Timing Adjustment)

      Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      If the result is not as specified, replace the switch assembly.

5. Check the front washer operation.
   1. Turn the wiper switch OFF.
   2. Connect a battery positive (+) lead to terminal E14-2 (+B) and a negative (-) lead to terminals E14-1 (+S) and E13-2(EW).
   3. Connect a voltmeter's positive (+) lead to E14-3 (+1) and a negative (-) lead to terminal E13-2 (EW).
   4. Turn the washer switch ON and OFF, and check the voltage between terminals E14-3 (+1) and E13-2 (EW).

      OK: 

      Voltage changes as shown in the illustration below  .

      Fig 4: Front Washer Switch Connector Terminals Voltage Graph

      Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      If the result is not as specified, replace the switch assembly.

6. Check the rear wiper switch.
   1. Measure the resistance according to the value(s) in the table below.

   Standard Resistance 

   STANDARD RESISTANCE REFERENCE
   
   

   Tester Connection	Switch Condition	Specified Condition
   E13-2 (EW) - E13-6 (C1R)	LO	Below 1 Ω
   E13-2 (EW) - E13-7 (+1R)	HI
   E13-2 (EW) - E13-6 (C1R)	OFF	10 kΩ or higher
   E13-2 (EW) - E13-7 (+1R)

   If the result is not as specified, replace the switch assembly.

7. Check the rear washer switch.
   1. Measure the resistance according to the value(s) in the table below.

Standard Resistance 

If the result is not as specified, replace the switch assembly.

Fig 5: Identifying Rear Washer Switch Connector Terminals

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002