C5 High Speed Radiator Fan Ground Control Relay Circuit

Scan Tool 197 (MIL 31):

Trouble Code Number
- Scan tool 197
- General scan tool P1498
- MIL 31

Fault Message
- High Speed Radiator Fan Ground Control Relay Circuit

Background
- The high speed radiator fan relay controls the high speed operation of the radiator fan.
- One side of the relay control coil is supplied with 12 volts when the ignition switch is turned to the ON position.
- The circuit is completed when the other side of the relay coil is grounded by the PCM.
- The PCM grounds the relay control circuit depending on engine coolant temperature and/or etc.

Range of Check
- Battery voltage 10 V or more
- Ignition switch: ON

Set Condition
- An open or shorted condition is detected in the high speed radiator fan relay control circuit for 3 seconds.

Probable Cause
- Relay coil open or shorted
- Ignition switch output circuit open
- High speed radiator fan relay control circuit open or shorted
- PCM failed