If any of the relays is suspected to be faulty, it should be removed and subjected to a diagnostic check at a dealership or a specialized auto repair shop. Replacing a failed relay is done as an assembly.
The relay is a switch, which, depending on the purpose, performs the following functions:
- 1 Turns on the starting current when the power circuit is in another place and makes it possible to use low-current cables and switching contacts in this way.
- 2 Controls the activation of multiple current circuits.
- 3 Turns on the circuit after a set time, which, in particular, is used when controlling the operation of the windshield wiper.
Most of the relays are located in a separate block, which has a different design for cars before 1997 and after 1997 of release. The relay has a specific designation and differs depending on the year of manufacture of the car only with the help of the illustrations shown.
The relay panel for a car up to the end of 1996 is shown in the illustration.
It should be borne in mind some changes in the design that have occurred on cars since mid 1995 release. These changes are indicated by the year of issue 1995:
- 1 = K18, horn
- 2 = K8, wiper
- 3 = K5, fog lamp
- 4 = pre-1995 air conditioning
- 5 = headlight high beam
- 6 = K69, parking and rear lights before 1995 release
- 6 = K148, parking and rear lights from 1995 release
- 7 = K73, headlight before 1995
- 7 = K157, headlight from 1995 release
- 8 = K7, fan (with air conditioning until 1995 release) and fan since 1995 release
- 8 = K92, fan without air conditioning until 1995
Contents of the relay panel from 1997 release clear from the description below. As you can see from the illustration, the location of the relay is the same, but the relay performs different functions:
- 1 = K18, horn
- 2 = K8, windshield wiper
- 3 = K5, fog lamp
- 4 = K140, light signal
- 5 = K4, low beam
- 6 = K148, parking and rear light
- 7 = K157 headlight
- 8 = K7, heater
Some vehicles have additional relays installed in the engine compartment, which are not discussed here.
If the circuit or device controlled by the relay has a fault, the appropriate current consumer can be switched on for testing. If the relay is OK, you will hear a click. From this it can be assumed that there is a malfunction in the current consumer or the supply wires. If the relay does not have power, then this means that there is a damage in the supply wires. In this case, the malfunction is detected by replacing the relay with a good one.
When replacing a relay, it should be borne in mind that externally the relay may have the same appearance, but is intended for other purposes.
1. To replace the relay, turn off the ignition.
2. Take out the relay and put in a new one.
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