If during troubleshooting it is found that the wires are normal, as well as the corresponding fuse and relay, then the central distribution panel may be the cause of the defect. Typical defects are loose contacts or failures due to temperature fluctuations. In such cases, the central distribution panel must be replaced.
1. Get a new distribution board. At the same time, make sure that the purchased panel fully corresponds to the one installed on your car.
2. Open the panel cover and disconnect the hinges.
3. Release the brackets holding the panel and remove it along with the connected wires.
4. Disconnect all plugs in order from the old distribution board and connect to the new one.
5. Install the new panel into the mounting frame.
6. Make sure all wires are connected.
Attention! The cover of the central distribution panel must be closed. Otherwise, when driving in the footwell on the driver's side, a draft will be felt.
All other relays are located on an additional block located under the instrument panel on the left side. Access to this block is closed by a panel overlay (see illustrations 2.0a, 2.0b, 2.0c).
Conventional switching relays are installed for consumers of the on-board network with high voltage. With the help of these relays, the losses of electricity that are inevitable when connecting such consumers directly to the power source are prevented.
Certain relays can perform additional functions, such as activating the turn signal breaker or the intermittent wiper cycle.
Some relays have a control function, such as the power window relay or the interior light turn-off delay relay.
Some relays are mounted on a box located under the rear seat of the car (see illustrations 2.0d and 2.0e).
When the corresponding consumer is switched on, the voltage supplied to terminal 86 closes the electrical circuit through terminal 85 («weight»). The magnetic coil inside the relay attracts the contact and thus completes the operating current circuit. The working current flows to terminal 30, and from there through terminal 87 further to the consumer. Sometimes the relay has terminal 87a, which is hardwired to terminal 87.
Switching relays - check
Voltage must be constant at terminal 30, unless the current consumer depends on another relay, for example, the rear fog lamp relay is only energized after the lights are turned on.
To check the power supply, remove the relay from the unit and connect a tester with a test lamp to terminal 30 of the relay base. If the light is off, then there is a break in the line.
1. Connect terminal 86 to battery positive (+), and terminal 85 with negative (-). If the relay is OK, then you should clearly hear how the coil attracts the relay contact. Otherwise, the relay is faulty. If you don't have a known-good relay on hand, you can install a jumper on the relay to continue driving.
2. Pull the relay out of the holder.
3. Install a jumper by connecting terminals 30 and 87. You can use a regular paper clip as a jumper. This technique provides the same thing that a healthy relay should do. In order to disable the consumer, you must remove the jumper.
Relay for unloading of the X-contact of the ignition switch
This contact plays an important role. The unloading relay itself is a conventional switching relay.
The X-terminal of the ignition switch is only energized when the key in the ignition switch is set to «Movement». All significant consumers of the on-board network, such as the windshield wiper, rear window heater or interior fans, are connected to the network through this terminal. This ensures that maximum voltage is supplied to the starter at the time of starting the engine.
2.0 Central distribution panel. Relays are numbered. Relays have the same designation on electrical diagrams.
1 - relay for fog lights and tail lights. For vehicles without fog lamps, there is a jumper in this place.
2 - radiator fan relay (for vehicles without air conditioning), radiator fan relay for turning on the 2nd stage of rotation
3 - fan relay
4 - headlight washer relay
5 - X-contact unloading relay
6 - relay for interior blower fans (manual air conditioner), A/C fan relay for 2nd stage speed (automatic air conditioner)
Visitor comments