Renewing electrical parts — VW

Relay for resistance wire - J116
Heater control unit - J65
With S23 fuse (1.25 amps)
Terminal assignment
Voltage protection
Delaying times => Fig.
3

Fuse (16 amps) - S51
At the fuse box/relay plate

Terminal 58b connection (dial illumination)
Terminal 15 connection
Temperature regulating switch - E13
Terminal assignment, test values => Fig.
1

Vehicle wiring loom connections
Earth to body
With self-tapping screw

Connector - T7a
Connector - T7b
Connector - T2a
Rubber seals for wiring loom glands
Connector - T11
D2 L diesel-electric heating
With glow spark plug - Q5
combustion monitor - F16
overheating switch - F17
fresh air blower relay (printed circuit board - J13
temperature sensor (printed circuit board) - N10
combustion air blower - V6

Electrical wiring loom for metering pump
Electrical fuel pump - G6
Install, test delivery => Page
82-32

Fig.1
Temperature regulating switch - E13

E13a -
Switch part
E13b -
Regulating part
K8 -
Fresh air blower warning lamp (green)
K11 -
Heater warning lamp (red)

Assignment of connector T11 at temperature regulating switch

1 · Earth · brown
2 · Temperature sensor · grey
3 · Temperature sensor · grey
4 · To terminal 58 · grey/blue
5 · Overheating signal · blue/white
6 · Automatic switches for full heating capacity when starting · white
7 · Unassigned
8 · Pulse output · green/red
9 · Electric fuel pump pulse · green/white
10 · Ventilate · black/green
11 · Terminal 30 · red
12 · Switch · yellow

Notes:

Do not jump leads for temperature sensors (2 and 3) otherwise the temperature regulating switch will be damaged irreparably.
If there is a break in the leads in the temperature sensor circuit, the heating operates in the part load area. Too high an interior temperature is simulated.

Test values:

For regulating part E13b between 2 and 3:

Position 1: approx. 870ω
Position 7: approx. 1,000ω

Fig.2
Install and test electric fuel pump - G6

Installation:

Inclined position 15° to 90°.

Fig.3
Heater control unit - J65

1 -
Main fuse for combustion air blower - S23 (1.25 A)

Terminal assignment

Terminal 1 - Glow spark plug - Q5 (+)

Terminal 2 - Combustion air blower (+)

Terminal 3 - Earth (-)

Terminal 4 - Power supply (+)

Terminal 5 - Overheating switch (-)

Terminal 6 - Pulse for electric fuel pump (-)

Terminal 7 - Electric fuel pump (+)

Terminal 8 - Feedback to temperature control switch (+)

Terminal 9 - For heater warning lamp - K11 (-)

Undervoltage protection: 10.2 V

Delayed switch-off 20 sec.

Overvoltage protection: 15.0 V

Delayed switch-off 20 sec.

Delay time

Approx. 3 sec. after the heating is switched on earth (-) is connected to:

Terminal 5 for combustion air blower V6

Terminal 7 for electric fuel pump

Terminal 8 for glow spark plug

Check fuel delivery of pump

Preparation:

Remove fuel line from heating.
Insert fuel line in measuring glass (10 cc or 25 cc).
Insert voltmeter between terminal 3 (-) and terminal 4 (+) of the control unit J65.
Switch on heating.
Vent fuel hose.

1 -
Measuring glass
2 -
Stop watch
3 -
Voltmeter (e. g. V.A.G 1315 A)

Note:

The following measurement must be carried out in the voltage range 11 to 13 volts between terminals 3 and 4 of the control unit J65.

Measurement

After start-up of the blower hold the measuring glass so that it is level with the connection for fuel on the heater.
Switch on stop-watch.
Switch off heating after a minute.
Read off fuel quantity.

Notes:

Do not adjust fuel delivery!
Replace electric fuel pump if applicable.