AD83.70-W-5000A | Auxiliary heater, diagnosis, troubleshooting | 16.7.97 |
MODEL 950, 952, 953, 954
with CODE (H60) "Eberspächer" D1 LP hot air auxiliary heater
with CODE (H61) "Webasto" Air Top 2000 hot air auxiliary heater
with CODE (H62) "Eberspächer" D3 LP hot air auxiliary heater
with CODE (H64) "Eberspächer" D9W hot water auxiliary heater
with CODE (H65) "Webasto"Thermo Top 90 hot water auxiliary heater
| Auxiliary heater (ZHE), location of components | ||
Auxiliary heater (ZHE) diagnosis, basic knowledge | |||
a | Battery voltage 22.5 to 29.5 V. | ||
b | Electrical system checked according to vehicle operating instructions and OK | ||
| When checking with the multimeter it is necessary for the pins in the 18-pin auxiliary heater connector on hot air auxiliary heaters to be connected as follows: Pin 4 to ground and pin 1 to circuit 30. On hot water auxiliary heaters, it is necessary for the pins in the 7-pin connector to be connected as follows: PIN 4 to ground and PIN 2 to circuit 30. | ||
Troubleshooting | |||
Complaint | Possible cause | Remarks | Remedy |
Auxiliary heater switch (S62) does not work. | Discontinuity or short circuit in wiring from auxiliary heater control module to auxiliary heater switch. Auxiliary heater switch defective. | Check cables, connectors, plugs, fuses and electrical components for damage, correct connection, intermitent contact and corrosion. Check auxiliary heater switch. | |
Timer S61 does not work. | Discontinuity or short circuit in wiring from auxiliary heater control module to timer. Timer defective. | Check cables, connectors, plugs, fuses and electrical components for damage, correct connection, intermitent contact and corrosion. Check timer. | |
Cab/engine heater switch S60 does not work. Only with hot water heater | Discontinuity or short circuit in wiring from auxiliary heater control module to cab/engine heater switch. Cab/engine heater switch defective. | Check cables, connectors, plugs, fuses and electrical components for damage, correct connection, intermitent contact and corrosion. Check cab/engine heater switch. | |
Soothy combustion. | Combustion air line, exhaust line clogged. Fuel metering pump supplies too much fuel. Deposits in heat exchanger. | Eliminate clogging. Check fuel metering pump. Eliminate deposits. | |
No warm air in interior. Only with hot water heater | Vehicle blower not switched on. Vehicle blower not working. | Switch on vehicle blower. Check vehicle blower as well as cables, plugs, connectors, fuses and electrical components for damage, correct connection, intermitent contact and corrosion. |