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FOREWORD
This wiring diagram manual has been prepared to provide
information on the electrical system of the 1990 TOYOTA
CAMRY.
Applicable models: SV21, 25 series
VZV21 series
For service specifications and repair procedures of the above
models other than those listed in this manual, refer to the
following manuals;
Pub. No.
Manual Name
1990 Camry Repair Manual Volume 1
RM151U1
Volume 2
RM151U2
TCCS (3S–FE) Diagnosis Manual
DM011U
ECT (A140E) Diagnosis Manual
DM013U
ECT (A540E) Diagnosis
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INTRODUCTION This manual consists of the following 12 sections: No. Section Description 1 INDEX Index of the contents of this manual. 2 INTRODUCTION Brief explanation of each section. HOW TO USE 3 Instructions on how to use this manual. THIS MANUAL TROUBLE– 4 Describes the basic inspection procedures for electrical circuits. SHOOTING 5 ABBREVIATIONS Defines the abbreviations used in this manual. GLOSSARY OF 6 TERMS AND Defines the symbols and functions of major parts. SYMBOLS Shows position of t
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HOW TO USE THIS MANUAL This manual provides information on the electrical circuits installed on vehicles by dividing them into each system circuit. The actual wiring of each system circuit is shown from the point where the power source is received from the battery as far as each ground point. (All circuit diagrams are shown with the switches in the OFF position.) When troubleshooting any problem, first understand the operation of the circuit where the problem was detected (see System Circuit sec
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HOW TO USE THIS MANUAL 4
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: System Title : Indicates the wiring color. A J : Indicates a Relay Block. No shading is used and only Wire colors are indicated by an alphabetical code. B the Relay Block No. is shown to distinguish it from the B = Black L = Blue R = Red J/B. BR = Brown LG = Light Green V = Violet Example: Indicates Relay Block No. 1. G = Green O = Orange W = White : Indicates the connector to be connected to a part (the C numeral indicates the pin No.) GR = Gray P = Pink Y = Yellow The first letter indicates
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HOW TO USE THIS MANUAL SYSTEM OUTLINE P WITH THE IGNITION SW TURNED ON, THE CURRENT FLOWS TO TERMINAL 3 OF THE POWER WINDOW MASTER SW, TERMINAL 2 OF THE POWER WINDOW CONTROL RELAY AND TERMINAL 8 OF THE POWER WINDOW SW THROUGH THE DOOR FUSE. 1. DRIVER’S WINDOW “MANUAL UP” OPERATION BY MASTER SW HOLDING MANUAL SW (DRIVER’S) ON “UP” POSITION LOCATED IN POWER WINDOW MASTER SW, THE CURRENT FLOWS TO TERMINAL 5 OF THE POWER WINDOW CONTROL RELAY THROUGH TERMINAL 3 OF THE MASTER SW TERMINAL 2 TO OPERAT
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: Explains the system outline. P : Indicates values or explains the function for reference during troubleshooting. Q : Indicates the reference page showing the position on the vehicle of the parts in the system circuit. R Example: Part A (Power Window Master SW) represents code P4 on page 21 of the manual. * The letter in the code is from the first letter of the part, and the number indicates its order in parts starting with that letter. Example: P 4 Part is 4th in order Power Window Master SW :
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HOW TO USE THIS MANUAL The Power – Load section, describes which parts each power source (fuses, fusible links, and circuit breakers) transmits current to. In the Power Source circuit diagram, the conditions when battery power is supplied to each system are explained. Since all System Circuit diagrams start from the power source, the power source system must be fully understood. POWER SOURCE (Power–Load, Reference) POWER SOURCE 8
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The ground points circuit diagram shows the connections from all major parts to the respective ground points. When troubleshooting a faulty ground point, checking the system circuits which use a common ground may help you identify the problem ground quickly. The relationship between ground points ( , , and shown below) can also be checked this way. GROUND POINTS 9
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TROUBLESHOOTING VOLTAGE CHECK (a) Establish conditions in which voltage is present at the check point. Example: – Ignition SW on – Ignition SW and SW 1 on – Ignition SW, SW 1 and Relay on (SW 2 off) (b) Using a voltmeter, connect the negative lead to a good ground point or negative battery terminal, and the positive lead to the connector or component terminal. This check can be done with a test light instead of a voltmeter. CONTINUITY AND RESISTANCE CHECK (a) Disconnect the battery terminal or w
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FINDING A SHORT CIRCUIT (a) Remove the blown fuse and disconnect all loads of the fuse. (b) Connect a test light in place of the fuse. (c) Establish conditions in which the test light comes on. Example: – Ignition SW on – Ignition SW and SW 1 on – Ignition SW, SW 1 and Relay on (Connect the Relay) and SW 2 off (or Disconnect SW 2) (d) Disconnect and reconnect the connectors while watching the test light. The short lies between the connector where the test light stays lit and the connector where
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TROUBLESHOOTING HOW TO REPLACEMENT FOR TERMINAL (with Terminal Retainer Type) 1. DISCONNECT CONNECTOR 2. DISCONNECT TERMINAL FROM CONNECTOR (a) “for A type” Raise the terminal retainer up to the temporally lock position. HINT: The needle insertion position varies according to the connector’s shape (number of terminals etc.), so check the position before inserting it. “for B type” Open the terminal retainer. (b) Release the locking lug from terminal and pull the terminal out from rear. 3. INSTALL
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ABBREVIATIONS ABBREVIATIONS The following abbreviations are used in this manual. A/C = Air Conditioner A.B.S = Anti Lock Brake System A/T = Automatic Transmission CB = Circuit Breaker COMB. = Combination DIFF. = Differential ECT = Electronic Controlled Transmission ECU = Electronic Control Unit EFI = Electronic Fuel Injection EGR = Exhaust Gas Recirculation EX. = Except FL = Fusible Link ISC = Idle Speed Control J/B = Junction Block LH = Left-Hand M/T = Manual Transmission O/D = Overdrive R/B
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GLOSSARY OF TERMS AND SYMBOLS BATTERY Current flow causes a headlight HEADLIGHTS Stores chemical energy and filament to heat up and emit light. 1. SINGLE converts it into electrical energy. A headlight may have either a FILAMENT Provides DC current for the auto’s single (1) filament or a double (2) various electrical circuits. filament. CAPACITOR (Condenser) 2. DOUBLE A small holding unit for temporary FILAMENT storage of electrical voltage. HORN CIGARETTE LIGHTER An electric device which sounds
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RELAY Basically, an electrically SPEAKER operated switch which may An electromechanical device 1. NORMALLY be normally closed (1) or which creates sound waves from open (2). CLOSED current flow. Current flow through a small coil creates a magnetic field which either 2. NORMALLY SWITCH, MANUAL opens or closes an OPEN attached switch. Opens and 1. NORMALLY closes circuits, OPEN thereby stopping (1) or RELAY, DOUBLE THROW allowing (2) A relay which passes current 2. NORMALLY current flow. through o
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RELAY LOCATIONS [Engine Compartment] [Body] [S/D] 16
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[Instrument Panel] [Body] [WAGON] 17
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RELAY LOCATIONS : J/B No. 1 Left Kick Panel (See Page 17) 18
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[J/B No. 1 Inner Circuit] 19
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RELAY LOCATIONS : J/B No. 2 E Engine ngine Compartment Compartment Left Left (S (See ee P Page age 16) 16) 2 : R/B No. 2 20
