## Fan Controls

#### Radiator Fan Switch Circuit Troubleshooting (Open)

10-16

Radiator Fan Switch Circuit Troubleshooting (Short)

1. Disconnect the radiator fan switch 2P connector.

1. Turn the ignition switch ON (II).

1. Measure voltage between the No. 2 terminal of the radiator fan switch 2P connector and body ground.

RADIATOR FAN SWITCH 2P CONNECTOR

Is there battery voltage?

YES - Go to step 4.

NO - Repair open in the wire between the radiator fan switch 2P connector terminal No. 2 and under-hood fuse/relay box.

1. Turn the ignition switch OFF, and check for continuity between the No. 1 terminal of the radiator fan switch 2P connector and body ground.

RADIATOR FAN SWITCH 2P CONNECTOR

Is there continuity?

YES - Replace the radiator fan switch.

NO - Check for an open in the wire between the radiator fan switch 2P connector terminal No. 1 and body ground. If the wire is OK, check for a poor ground at G301.

1. Remove the radiator fan relay from the under-hood fuse/relay box and test it, refer to the 2001 Civic Shop Manual (see page 22-80).

Is the relay OK?

YES - Go to step 2.

NO - Replace the radiator fan relay.

1. Remove the radiator fan switch, and test it (see page 10-17).

Is the radiator fan switch OK?

YES - Go to step 3.

NO - Replace the radiator fan switch.

1. Disconnect ECM connector B (24P) and the under-hood fuse relay box 14P connector.

1. Check for continuity between the No. 2 terminal of the radiator fan switch 2P connector and body ground.

RADIATOR FAN SWITCH 2P CONNECTOR

Is there continuity?

YES - Repair short in the wire between the radiator fan switch 2P connector terminal No. 2 and under-hood fuse/relay box.

NO - Replace the under-hood fuse/relay box.

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