1992 Toyota Previa Electrical Supplement

SYSTEM OUTLINE

THE SRS (SUPPLEMENTAL RESTRAINT SYSTEM) AIRBAG IS A DRIVER PROTECTION DEVICE WHICH HAS A SUPPLEMENTAL ROLE TO THE SEAT

BELTS.

WHEN THE I GN IT I ON SW I S TURNED TO ACC OR ON. CURRENT FROM THE CIG FUSE FLOWS TO TERMINAL @3 OF THE CENTER A IRBAG

SENSOR ASSEMBLY. ONLY WHEN THE IGNITION SW IS ON DOES THE CURRENT FROM THE IGN FUSE TO TERMINAL @I.

IF AN ACCIDENT OCCURS WHILE DRIVING. DECELERATION CAUSED BY A FRONTAL IMPACT IS DETECTED BY EACH SENSOR AND SWITCH.

AND WHEN THE FRONTAL IMPACT EXCEEDS A SET LEVEL (WHEN THE SAFING SENSOR BUILT INTO THE CENTER AIRBAG SENSOR ASSEMBLY

IS ON AND THE CENTER AIRBAG SENSOR IS ON. FRONT AIRBAG SENSORS ARE OFF). CURRENT FROM THE CIG OR IGN FUSE FLOWS TO

TERMINAL @a OF THE CENTER AIRBAG SENSOR ASSEMBI.t -7 TERMINAL 1 OF THE AIRBAG SQUIB -7 SQUIB -7 TERMINAL 2 -7

TERMINAL @7 OF CENTER AIRBAG SENSOR ASSEMBLY -7 TERMINAL @5. TERMINAL @IO OR BODY GROUND -7 GROUND.

WHEN THE SAFING SENSOR BUILT INTO THE CENTER AIRBAG SENSOR ASSEMBLY IS ON AND THE FRONT AIRBAG SENSOR LH OR RH IS ON.

CENTER AIRBAG SENSOR IS OFF AND CURRENT FROM THE CIG OR IGN FUSE FLOWS TO TERMINAL @a OF THE CENTER AIRBAG SENSOR

ASSEMBLY -7 TERMINAL 1 OF THE AIRBAG SQUIB -7 SQUIB -7 TERMINAL 2 -7 TERMINAL @7 OF CENTER AIRBAG SENSOR

ASSEMBLY -7 TERMINAL 01 OR @2 -7 TERMINAL 1 OF FRONT AIRBAG SENSOR -7 TERMINAL 2 -7 TERMINAL 02 OR @I

OF CENTER AIRBAG SENSOR ASSEMBLY -7 TERMINAL @5. TERMINAL @IO OR BODY GROUND -7 GROUND. WHEN THE SAFING SENSOR

BUlL T INTO THE CENTER AIRBAG SENSOR ASSEMBLY IS ON. AND THE FRONT AIRBAG SENSOR LH OR RH IS ON AND CENTER AIRBAG

SENSOR IS ON ONE OF THE ABOVE-MENTIONED CIRCUITS IS ACTIVATED SO THAT CURRENT FLOWS TO THE AIRBAG SQUIB AND CAUSES IT

TO OPERATE. THE BAG STORED I NS I DE THE STEER I NG WHEEL PAD I S I NST ANTANEOUSL Y EXPANDED TO SOFTEN THE SHOCK TO THE

DRIVER.

() I PARTS LOCATION

CODE SEE PAGE CODE SEE PAGE

A23^20 A26 I B^22

A24 20 A27 I C 22

A25 I A 22 A2a 22

c:> I RELAY BLOCKS

RELAY BLOCKS (RELAY BLOCK LOCATION)

RIB NO.1 (I NSTRUMENT PANEL CENTER)

c:J I CONNECTOR JOINING WIRE .... HARNESS AND WIRE HARNESS

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

IHI 26 ENGINE NO.1 WIRE AND COWL WIRE (UNDER THE DRIVER'S SEAT)

IH2

\V7 I GROUND POINTS

CODE SEE PAGE GROUND POINTS LOCATION

ID^26 LEFT SIDE OF INSTRUMENT PANEL REINFORCEMENT

IE^26 RIGHT SIDE OF INSTRUMENT PANEL REINFORCEMENT

c=) I SPLICE POINTS

CODE SEE PAGE WIRE HARNESS WITH SPLICE POINTS CODE

I 19 26 COWL WIRE 1161

1157 26 COWL WIRE 1162

A23. A24 YELLOW A250 YELLOW A26@ YELLOW

'1

C 2 DARK GRAY

'1

S24@

~~

~ ~

SEE PAGE

26

26

'1 :WITH ELECTRICAL CHECK MECHANISM (SEE PAGE 124)

CODE SEE PAGE

C 2 22

S23 I A 23

S24 I B 23

WIRE HARNESS WITH SPLICE POINTS

COWL WIRE

COWL WIRE

A27@ YELLOW A2a YELLOW