1992 Toyota Previa Electrical Supplement

SYSTEM OUTLINE

WHEN THE I GN I TI ON SW I S TURNED ON. CURRENT FLOWS TO TERMINAL 1 OF REAR WASHER MOTOR. TERMINAL 1 OF REAR II I PER RELAY

TERMINAL 1 OF REAR WIPER MOTOR THROUGH THE RR WIPER FUSE.

1. REAR WIPER NORMAL OPERATION
   WITH THE IGNITION SW TURNED ON AND REAR WIPER AND WASHER SW TURNED ON. THE CURRENT FLOWING TO TERMINAL 1 OF REAR WIPER
   RELAY FLOWS TO TERMINAL 6 OF RELAY '"'7 TERMINAL 1 OF REAR WIPER AND WASHER SW '"'7 TERMINAL 16 '"'7 TO GROUND. THUS.
   THE RELAY COIL IS ACTIVATED AND THE CURRENT TO TERMINAL 1 OF RELAY FLOES TO TERMINAL 3 '"'7 TERMINAL 3 OF REAR WIPER
   MOTOR '"'7 MOTOR '"'7 TERMINAL 2 '"'7 TO GROUND A~ CAUSES THE MOTOR TO OPERATE THE WIPER.


2. REAR WIPER INTERMITTENT OPERATION
   WITH THE IGNITION SW TURNED ON AND REAR WIPER AND WASHER SW TURNED TO INT POSITION. THE CURRENT FLOWING TO TERMINAL 1
   OF REAR WIPER RELAY FLOWS TO TERMUAL 4 OF RELAY '"'7 TERMINAL 10 OF WIPER SW '"'7 TERMINAL 16 '"'7 TO GROUND.
   AS A RESULT. THE RELAY OPERATES FOR APPROX. 9 TO 111 SEC. AND CURRENT FLOWS FROM TERMINAL 1 OF RELAY '"'7 TERMINAL 3
   '"'7 TERMINAL 3 OF REAR WIPER MOTOR '"'7 MOTOR '"'7 TERMINAL 2 '"'7 TO GROUND. CAUSING THE MOTOR TO ROTATE TO OPERATE
   THE WIPER. AT THIS TIME THE CONTACT IN THE WIPER MOTOR CLOSES AND THE CURRENT FLOWS FROM TERMINAL 1 OF REAR WIPER
   MOTOR '"'7 TERMINAL 4 '"'7 TERMINAL 2 OF REAR WIPER RELAY '"'7 TERMINAL 4 '"'7 TERMINAL 10 OF REAR WIPER AND WASHER SW
   '"'7 TERMINAL 16 '"'7 TO GROUND.
   THUS. THE INTERMITTENT-STOP CIRCUIT OPERATES. THE CONDENSER IN THE CIRCUIT CHARGES AND THE WIPER CONTINUES TO OPERATE
   UNTIL REACHING THE STOP POSITION. AFTER THE WIPER STOPS. CURRENT DOES NOT FLOW TO THE INTERMITTENT-STOP CIRCUIT FROM
   TERMINAL 2 OF RELAY. BUT THE CONDENSER DISCHARGES CURRENT INTO THE INTERMITTENT CIRCUIT AND THE CIRCUIT OPERATES UNTIL
   THE CONDENSER DISCHARGE ENOS. AS A RESULT. THIS DISCHARGE INTERVAL BECOMES THE INTERMITTENT TIME.
   WHEN THE CURRENT IS DISCHARGED COMPLETELY. THE CURRENT FLOWING TO TERMINAL 1 OF RELAY FLOWS TO TERMINAL 4 '"'7
   TERMINAL 10 OF REAR WIPER AND WASHER SW '"'7 TERMINAL 16 '"'7 TO GROUND.
   THEN. THE CURRENT IN TERMINAL 1 OF RELAY FLOWS FROM TERMINAL 3 '"'7 TERMINAL 3 OF MOTOR '"'7 MOTOR '"'7 TERMINAL 2
   '"'7 TO GROUND AND ROT A TES THE MOTOR. THROUGH REPE IT I ON OF TH I S PROCESS. I NTERM I TTENT OPERATION OF THE REAR W I PER
   OCCURS.

SERVICE HINTS

R 1 REAR WASHER MOTOR

I-GROUND,APPROX. 12VOLTS WITH IGNITION SW ON

2-GROUND'CONTINUITY WITH WASHER SW TURNED ON

R 6 REAR W I PER CONTROL RELA Y

I-GROUND,APPROX. 12VOLTS WITH IGNITION SW ON

4-GROUND,CONTINUITY WITH WIPER AND WASHER SW AT INT POSITION

6-GROUND,CONTINUITY WITH WIPER AND WASHER SW AT ON POSITION

() I PARTS LOCATION

CODE SEE PAGE CODE SEE PAGE

Cll 22 R 6 23

R 1 20 R211 21

c:> I RELAY BLOCKS

RELAY BLOCKS (RELAY BLOCK LOCATION)

RIB NO.1 (INSTRUMENT PANEL CENTER)

c:J I CONNECTOR JOINING WIRE HARNESS AND WIRE HARNESS

CODE SEE PAGE JOINING WIRE HARNESS AND WIRE HARNESS (CONNECTOR LOCATION)

IG2^26 COWL WIRE AND ROOF NO.2 WIRE (RIGHT SIDE OF INSTRUMENT PANEL)

CODE SEE PAGE

BPI^28 BACK DOOR NO.1 WIRE AND ROOF NO.2 WIRE (RIGHT REAR SIDE OF ROOF)

.

'V7 I GROUND POINTS

CODE SEE PAGE GROUND POINTS LOCATION

EA 24 FRONT RIGHT FENDER

EB^24 FRONT LEFT FENDER

I D 26 LEFT SIDE OF INSTRUMENT PANEL REINFORCEMENT

I SPLICE POINTS

WIRE HARNESS WITH SPLICE POINTS WIRE HARNESS WITH SPLICE POINTS

COWL WIRE COWL WIRE