Signal Specification, Parking Heater 091 B/D
WARNING: This page is about a different car, the 2002 Volvo C70, 2001 Volvo C70, 2000 Volvo C70, 1999 Volvo C70, and 1998 Volvo C70. However, it is still accessible from the selected car via links, so may be relevant.
General
All values given below are between the respective terminal in column 1 and terminal #2 (power ground) unless otherwise stated in brackets after the entry.
| U= | DC voltage in volts (V) | UAC = | AC voltage in volts (V) |
| Ubat = | Battery voltage (V) | f = | Frequency in Hertz (Hz) |
| Ulow = | Voltage approximately 0 V | % duty = | Duty cycle (pulse ratio) as a percentage (%) |
| t = | Time in milliseconds (ms) | - | - |
| Terminal | Signal Type | Ignition On | Heater started | Other |
| #1 | Timer control signal | Timer active: U > 7 V Timer not active: U < 2.75 V |
- | |
| #2 | Power ground (Measured to the battery negative terminal) Also the common ground for the flame sensor and engine coolant temperature sensor |
Ulow | - | |
| #3 | 30-supply (Power supply from battery) | Ubat | - | |
| #4 | Coolant temperature sensor signal | U≈Ulow | +20°C: U≈3.5 V | The voltage decreases with increasing temperature |
| #5 | Glow plug signal | U≈Ulow | Glow plug off: U=Ulow Glow plugs on: Frequency≈ 1 Hz |
- |
| #6 | - | - | - | |
| #7 | - | - | - | |
| #8 | - | - | - | |
| #9 | Diagnostic lead | U=1-2 V | If the fault tracing instrument is connected, other values apply | |
| #10 | Signal, flame sensor | U≈Ulow | Flame not lit: U > 4 V Flame lit: U < 1.5 V |
- |
| #11 | Control signal for the blower fan | Relay not activated: U≈12 V Relay activated: U less than 2.5 V |
- | |
| #12 | - | - | - | |
| #13 | Fuel pump control signal | Ubat | Fuel pump off: f=0 Hz Fuel pump on: f=maximum 7 Hz |
The frequency increases with pump speed |
| #14 | Water pump control signal | Water pump off and power supply off: Ulow Water pump off and power supply on: Ubat Water pump on and power supply on: Ulow |
- | |
| #15 | Power supply, combustion fan, fuel pump (FP) and water pump | Power supply off: Ulow Power supply on: Ubat |
- | |
| #16 | Combustion fan control signal | Combustion fan off and power supply off: Ulow Combustion fan off and power supply on: Ubat Fan on: Pulse ratio (% duty) > 0% |
The pulse ratio (% duty) increases with fan speed. | |