Checking the operation of the heater switch
Models up to 1996
1. Check up conductivity between conclusions of a socket of the switch.
- A) Check for continuity between terminals "2" And "3" pregnant "OFF" and the presence of conductivity in the position "ON".
- b) Check for continuity between terminals "1" And "4" (backlight) in all switch positions.
2. Check the operation of the timer.
- A) Connect "+" battery to the output "2", "-" to the conclusion "3".
- b) Connect Between Pins "1" And "4" control lamp 3.4 W.
- V) Set the switch to position "ON", check that the control lamp and illumination lamp are lit for 12-18 minutes, then go out.
3. Check the backlight. Connect the battery to the terminals "1" And "4", check that the lamp is on.
Models after 1996
1. Check for continuity between terminals "1" And "4" in all switch positions.
2. Check the operation of the timer.
- A) Connect "+" battery to the output "2", "-" to the conclusion "3".
- b) Connect "+" battery through a 3.4 W test lamp to the output "6".
- V) Set the switch to position "ON", check that the control lamp and illumination lamp are lit for 12-18 minutes, then go out.
3. Disconnect the connector from the switch and check the circuit from the wire side according to the table.
If the switch does not work as described, replace it.
Check and repair of wires of a heater of back glass
Note:
- When cleaning the glass, use a soft, dry cloth, wipe the glass parallel to the heater wires. Be careful not to damage the wires.
- It is forbidden to use detergents and compositions with abrasive particles.
- When measuring voltage, wrap the negative end of the tester with tin foil and press the edge of the foil against the wire with your finger.
1. Check for broken wires
- A) Turn on the ignition and the tailgate glass heater.
- b) Measure the voltage at the center of each fuser wire as shown.
- V) If the voltage is about 5 V, then the wire is normal.
- G) If the voltage is about 10 V, then a wire break has occurred between the middle and side bus of the thermocouple.
- d) If the voltage is about 0 V, then there is a wire break between the middle and "earth"
2. Search for a break in the wire.
- A) Connect "plus" voltmeter to the side rail "+" thermoelement.
- b) Wrap "minus" foil voltmeter. Connect the foil to the fuser wire at the side rail and. slowly move it to the opposite end (To "earth").
- V) The point at which the voltmeter needle deviates from zero by a few volts is the break point.
Note: if there is no break in the wire, then the voltmeter shows 0 V at the side rail of the thermocouple and, when the voltmeter contact is moved to the opposite end of the wire, the voltage will gradually increase to about 12 V.
3. Wire repair.
- A) Clean the ends of the wire at the broken point with solvent and apply protective tape (see fig.).
- b) Thoroughly mix the repair compound and use a brush to apply a drop of the substance to the wire. Repair Compound: DUPONT PASTE #4817 or equivalent.
- V) After a few minutes, remove the protective film and leave to harden for 24 hours.
Checking the mirror heater
1. Connect "+" battery to terminal ''4", "-" to the conclusion "5" connector.
2. Check that the mirror is heating up. If the mirror does not heat up, replace it.