P0480

P0480

494 Fan output stage 1 - open circuit

Diagnosis conditions
- Engine running
- Battery voltage greater than 7 V
- Intake air temperature greater than 9 °C
- Air conditioning switched on and off once

NOTE: The triggering wire for relays stage 1, terminal 85, is monitored

Possible fault cause
- Open circuit
- Relay faulty
- DME control module faulty

Affected terminals
Terminal IV/4

Diagnosis/troubleshooting

Part 1:

Part 2:

494 Fan output stage 1 - below limit

Diagnosis conditions
- Engine running
- Battery voltage greater than 7 V
- Intake air temperature greater than 9 °C
- Air conditioning switched on and off once

NOTE: The triggering wire for relays stage 1, terminal 85, is monitored

Possible fault cause
- Short circuit to ground
- Relay faulty
- DME control module faulty

Affected terminals
Terminal IV/4

Diagnosis/troubleshooting







494 Fan output stage 1 - above limit

Diagnosis conditions
- Engine running
- Battery voltage greater than 7 V
- Intake air temperature greater than 9 °C
- Air conditioning switched on and off once

NOTE: The triggering wire for relays stage 1, terminal 85, is monitored

Possible fault cause
- Short circuit to B+
- Relay faulty
- DME control module faulty

Affected terminals
Terminal IV/4

Diagnosis/troubleshooting