(1) System name:
- The diagram contains a description of electrical circuits with connectors, switches and wires related to a particular vehicle system, which facilitates troubleshooting.
- It is very important to understand the possible location and possible cause of the malfunction before starting the diagnosis of a particular section of the circuit.
(2) Types of connectors:
This section provides the following information.
- Connector image, front view (on the bundle side, not on the workpiece side).
- Connector color.
- Output number.
- Wire color.
- Destination output.
Each pin on the connector is numbered in accordance with paragraph (3).
Connector type and pin numbering order.
Outputs without connection are marked with a dash (-).
(3) Connector type and pin numbering order:
Note: In any other case, view of all connectors from the terminal side.
(4) Component location:
To facilitate the search for a component, below the designation of the component itself, the number of the photo is given, which shows its location. The photos themselves are placed in the corresponding section of this chapter.
(5) Wire color designation:
Designation | Wire color |
IN | black |
Vg | brown |
G | green |
Gr | grey |
L | blue |
Lg | light green |
T | light brown |
ABOUT | orange |
R | pink |
R | red |
W | white |
Y | yellow |
pp | purple |
LI | light blue |
X/Y | "X" wire color, "Y" wire stripe color |
Note: The wiring harness designation is also on the harness itself in the vehicle.
(7) Connector number:
The designation of the connector consists of a letter - the designation of the wiring harness, corresponding to its location, and the number of the connector. For example:
1. Number related to the auxiliary socket (serial number)
2. Number related to the main connector (serial number)
3. Letter indicating the location of the wiring harness (engine wiring harness)
Note: The connector used to connect different wiring harnesses has the following designation.
1. Number related to the main connector (serial number)
2. Rear (Rear) wiring harness
3. Chief (Main) wiring harness.
Distribution blocks also have their own designation, which consists of the designation of the wiring harness corresponding to its location, and the number of the connector in the distribution block.
Note: The numbers in the wire designation indicate its diameter.
(6) Wire classification:
Wiring harnesses are classified according to their location in the vehicle.
Symbol | Wire harness name | Location |
E | Front and battery harness | Engine compartment, front bumper |
M | Main wiring harness | Passenger cabin |
F | floor wiring harness | Floor |
WITH | Electric heater control wiring harness | Engine compartment, passenger compartment |
R | Wiring harness for tailgate, ceiling, rear parking sensors | Ceiling, tailgate, bumper |
S | Seat harnesses | seats |
D | door wiring harnesses | doors |
For example:
1. Connector designation.
2. Abbreviation meaning «Passenger compartment junction block»
Note: In addition, the following abbreviations can be found on the wiring diagrams:
- Automatic transmission - automatic transmission.
- Manual - manual transmission.
- ECM - electronic engine control unit.
- PCM - electronic engine control unit.
- TCM - electronic transmission control unit.
- BCM - electronic control unit of the car body.
- SRS - additional passive safety system (SRS).
- ESP - electric power steering.
- EMS - engine management system.
- ABS - anti-lock braking system.