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Wiring Schematics 101 Electrical Symbols • Supplemental Inflatable Restraint (SIR) or Supplemental Restraint System (SRS) Icon • This icon is used to alert the technician that the system contains SIR/SRS components that require certain precautions before servicing. • Voltage Indicator Boxes • These boxes are used on schematics to indicate when voltage is present at a fuse. • Partial Component • When a component is represented in a dashed box, the component or its wiring is not shown in its entirety. • Entire Component • When a component is represented in a solid box the component or its wiring is shown in its entirety. • Fuse • Circuit Breaker • Fusible Link • Connector Attached to Component • Pigtail Connector • Bolt On or Screw On Eyelet Terminal • Inline Harness Connector • Splice • Pass Through the Grommet • Chassis Ground • Case Ground • Single Filament Light Bulbs • Double Filament Light Bulb • Light Emitting Diodes • Capacitor • Battery • Resistor • Variable Resistor • Position Sensor • I/O Resistors • I/O Switches • Diode • Crystal • Heating Elements • Motor • Solenoid • Coil • Switches • Single Pole Single Throw Relay • Single Pole Double Throw Relay AWG CHART (Gauge) 8/0 7/0 6/0 5/0 4/0 3/0 2/0 0 10 11 12 14 16 (Inches) 0.7314 0.6514 0.5801 0.5166 0.4600 0.4096 0.3648 0.3249 0.1019 0.0907 0.0808 0.0641 0.0508 (Gauge) 18 19 20 21 22 23 24 25 26 27 28 29 30 (Inches) 0.0403 0.0359 0.0320 0.0285 0.0253 0.0226 0.0201 0.0179 0.0159 0.0142 0.0126 0.0113 0.0100 How to Use Electrical Schematics • Important • The schematic does not represent the components and wiring as they physically appear on the vehicle. For example, a 4-foot length of wire is treated no differently in a schematic from one which is only a few inches long. • When diagnosing a horn problem use the service information located in the Horns service category. The following schematic is a typical example of a schematic with its supporting text. Schematics use a top (power) to bottom (ground) sequence to present electrical information. Power Window IP Fuse Block Window Circuit Breaker Amp Hot in Run 343 2YEL S305 D C301 P500 C2 L 2 DK BLU 164 S504 G110 Engine Controls Components Name Location Locator View Connector End View On the lower left side of Body Control the IP below the steering Module (BCM) column Body Control System Component Views in Body Control System Body Control System Connector End Views in Body Control System Camshaft Position (CMP) In the distributor Sensor Engine Controls Component Views Engine Controls Connector End Views In the extension housing on Vehicle Speed Engine Controls Component the left side of the Sensor (VSS) Views transmission Engine Controls Connector End Views C202 On the left side of the IP on the back of the cluster Harness Routing Views in Wiring Systems Inline Harness Connector End Views in Wiring Systems G100 Power and Grounding On the left radiator support Component Views in Wiring bracket Systems -- G102 On the right front of the engine block (4.3L) -- -- G106 On the right front of the engine block (4.3L) -- -- P100 At the left rear of the engine compartment in the front of the dash Power and Grounding Component Views in Wiring Systems -- Splice Pack 203 On the top left side of the (SP203) IP near the A pillar Harness Routing Views in Wiring Systems -- On the left side of the IP Splice Pack 205 behind the headlamp (SP205) switch Data Link Communications Component Views in Wiring Systems Data Link Communications Connector End Views in Wiring Systems S101 In the forward lamp harness -- -- S102 In the engine harness -- -- S103 In the engine harness -- -- FRT DOOR COMPONET LOCATOR 1 S504 (Left), S601 (Right) 2 S600 (Right) 3 S506 (Left) 4 S605 (Right 5 Front Power Window Switch Connector (C1) 6 Front Power Window Switch Connector (C2) 7 Power Door Lock Switch Connector 8 Front Door Lock Motor 9 Front Door Lock Motor Connector 10 S505 (Left), S603 (Right) 11 Speaker Connector 12 P500 (Left), P600 (Right) Zoning All grounds, in-line connectors, passthrough grommets, and splices have identifying numbers that correspond to where they are located in the vehicle. The following table explains the numbering system Callout Numbers Zone Description 100-199 Engine compartment (All forward of the dash panel) 001-099 are additional for the engine compartment (Only to be used if all 100-199 items are used) 200-299 Within the instrument panel area 300-399 Passenger compartment (From instrument panel to the rear wheelhouse) 400-499 Luggage compartment (From the rear wheelhouse to the rear of the vehicle 500-599 Within the left front door 600-699 Within the right front door 700-799 Within the left rear door 800-899 Within the right rear door 900-999 Within the liftgate or endgate door CONNECTOR END VIEWS Door Lock Switch Connector Connector Part Information 12064998 8-Way Female M/P 280 Series Pin A Wire Color -- Circuit No. -- Function B ORN 640 Fuse Output Battery Type 3 Fuse C BLK 1050 Ground D LT BLU 195 Power Door Lock Relay Feed Lock Coil E -- -- F ORN 640 G BRN 9 H WHT 194 Not Used Not Used Fuse Output Battery Type 3 Fuse Park Lamp Feed Power Door Lock Relay Feed Unlock Coil Power Windows Circuit Description • • • • • • • • • A permanent motor operates each of the power windows. Each motor raises or lowers the glass when voltage is supplied to the motor. The direction that the motor turns depends on the polarity of the supply voltage that the switch provides. The LH front power window master switch controls all of the window motors. The passenger window also has a separate switch. Each motor is protected by a built-in circuit breaker. The circuit breaker opens the circuit if the window switch is held down too long and the following conditions apply: The window is obstructed The window is full up The window is fully down The circuit breaker automatically resets while cooling. When the ignition switch is turned to the RUN position, CKT 343 (YEL) supplies battery voltage to the LH front power window master switch. When you operate any of the UP switches, battery voltage is supplied to the window motor. the voltage is grounded through the DN contact. The motor runs in order to drive the window up. When you operate any of the DN switches, battery voltage is supplied to the window motor in the opposite direction. The window motor is grounded through the UP contact. The motor runs in order to drive the window down. TIME FOR EXTRA WORK