Checking the electrical circuit of the windshield wiper motor
Note: Refer to the electrical diagrams to perform the following tests. When checking for voltage, apply the probe of a grounded 12-volt test lamp to each terminal of the electrical connector until the lamp lights; this confirms that voltage is present at the terminal. If the following checks do not resolve the problem, have the system diagnosed by your dealer's service department or another properly equipped service station.
1. If your windshield wipers are running slowly, make sure the battery is in good condition and properly charged (see chapter 5). If the battery is in good condition, remove the wiper motor (see below) and operate the wiper arms manually. Check the linkage and its joints for binding. Lubricate or repair them if necessary. Reinstall the wiper motor. If the wipers still operate slowly, check the relevant electrical circuit for loose or corroded connections, especially the ground connection. If all connections are OK, replace the motor.
2. If the wipers do not operate when turned on, check the fuse in the fuse box located in the passenger compartment on the driver's side. If the fuse is good, install a jumper wire between the ground terminal of the wiper motor and body ground and retest. If the motor now operates, repair the ground circuit. If the motor still does not operate, move the wiper switch to the high speed (HI) position and test for voltage at the motor.
Note: To access the windshield wiper motor electrical connector, the hood panel must be removed (see chapter 11).
3. If there is voltage at the electrical connector, remove the motor and test it outside the vehicle using fused jumper cables connected to the battery. If the motor now operates, check the linkage for binding (see step 1). If the motor still does not operate, lure it in. If there is no voltage at the motor, check for voltage at the wiper control relay. If there is voltage at the wiper control relay and no voltage at the wiper motor, check the switch. If the switch is OK, the wiper control relay may be faulty. For information on checking the relay, refer to paragraph 5.
4. If the interval wiper function does not work, check the integrity of all wiring between the switch and the wiper control module.
5. If the windshield wipers stop in the position they were in when the switch was turned off (cannot return to their original position), check for voltage supply wire of the reset function in the electrical connector of the wiper motor when the wiper switch is turned off and the ignition is turned on. If there is no voltage, check for a break in the circuit between the wiper motor and the fuse panel.
Replacement
Windshield wiper motor
Lexus Models
6. Unscrew the wiper arm nuts and mark the position of the arms relative to their shafts (fig. 13.6, a, b). Remove both wiper arms.
Fig. 13.6, a. On the Lexus model, the left wiper arm is a regular single arm secured with a nut. Loosen the nut and mark the position of the arm relative to the shaft
Fig. 13.6, b. On the Lexus model, the right (on the passenger side) the windshield wiper arm consists of two arms and nuts. Unscrew both nuts…
Fig. 13.6, c....and mark the position of the levers relative to the shafts
7. Remove the plastic hood panel (see chapter 11).
8. Disconnect the electrical connector of the windshield wiper motor (Fig. 13.8).
Fig. 13.8. To disconnect the windshield wiper motor electrical connector, press the locking element (lexus models)
9. Unscrew the corresponding bolts and remove the windshield wiper motor assembly with the lever mechanism (Fig. 13.9).
Fig. 13.9. To disconnect the windshield wiper motor assembly from the linkage, remove the five bolts (lexus models)
10. Use a screwdriver to pry up and carefully remove the connecting rod from the pivot pin on the electric motor crank arm.
11. Unscrew the nut securing the crank lever to the electric motor shaft.
12. Mark the position of the lever relative to the motor shaft and remove the lever.
13. Remove the three bolts and remove the electric motor from the support bracket.
14. Installation is performed in the reverse order of removal.
Toyota Models
15. Remove the caps from the wiper arm mounting nuts (Fig. 13.5), and then unscrew these nuts.
Fig. 13.15. Remove the cap from the nut on each wiper arm and unscrew the nut (toyota models)
16. Mark the position of each wiper arm relative to its shaft, then remove the arms (fig. 13.6, a).
17. Remove the plastic hood panel (see chapter 11).
18. Disconnect the electrical connector of the windshield wiper motor (fig. 13.18).
Row 13.18. To disconnect the electrical connector of the windshield wiper motor, remove it on the locking tab and disconnect the connector
19. Remove the appropriate bolts and remove the windshield wiper motor assembly with the linkage (fig. 13.19).
Fig. 13.19. To disconnect the windshield wiper motor assembly from the lever mechanism, unscrew the two bolts (1), and then slide the assembly to the right (to the passenger side), to detach the rubber support from the semicircular bracket (2) located in the center in the area in front of the windshield
20. Use a screwdriver to pry the connecting rod off the hinge on the windshield wiper motor crank arm (fig. 13.20).
Fig. 13.20. Using a trim puller, separate the tie rod from the joint on the crank arm
21. Loosen the nut on the crank arm (fig. 13.21), mark the position of this lever relative to the motor shaft and remove the lever from the shaft.
Publication Reprinted from a web portal ToyotaMan.ru
Fig. 13.21. To disconnect the windshield wiper motor from the linkage, unscrew the two bolts (1). If you are replacing the motor, unscrew the crank arm mounting nut (2).
22. Remove the windshield wiper motor mounting bolts and separate the motor from the lever mechanism.
23. Installation is performed in the reverse order of removal.
Rear window wiper motor
24. Remove the cap from the rear window wiper arm mounting nut (fig. 13.24) and unscrew the nut.
Fig. 13.24. To clean the rear window wiper arm, remove the cap from the nut, unscrew the nut, mark the position of the wiper arm relative to the motor shaft, and then remove the arm and sealing bushing
25. Mark the position of the rear window wiper arm relative to the motor shaft, and then remove the arm.
26. Remove the trim panel from the tailgate (see chapter 11).
27. Disconnect the wiper motor electrical connector (fig. 13.27).
Fig. 13.27. Disconnect the electrical connector of the rear window wiper motor
28. Remove the windshield wiper motor mounting bolts (fig. 13.28) and remove the electric motor.
Fig. 13.28. To disconnect the rear window wiper motor from the tailgate, remove the three bolts
29. Installation is performed in the reverse order of removal.