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Radiator Fan Switch Circuit
Troubleshooting (Openl
1. Disconnect the radiator fan switch 2P connector.
2. Turn the ignition switch ON (ll).
3. Measure voltage between the No.2 terminal ofthe
radiator fan switch 2P connector and body ground.
BADIATOR FAN SWITCH
2 P C O N N E C T O R
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.l
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
ls there continuity?
YES Replace the radiator fan switch.I
NO Check for an open in the wire between the
radiator fan switch 2P connector terminal No. 1 and
body ground. lf the wire is OK, check for a poor
g r o u n d a t G 3 0 1 . t
Radiator Fan Switch Circuit
Troubleshooting (Shon)
1, Remove the radiator fan relay from the main under-
hood fuse/relay box, and test it (see page22-401.
ls the rclay OK?
VES Go to step 2.
NO Replace the radiator fan relay.I
2. Remove the radiator fan switch, and test it {see
p a g e 1 0 - 1 8 ) .
ls the radiator f an switch OK?
YES - Go to step 3.
NO Replace the radiator fan switch.l
3. Disconnectthe negative cable from the battery.
4. Disconnect Engine Control N4odule (ECM)
connector A (25P) and the under-hood fuse/relay
box 16P connector.
5. Check for continuity between the No. 2 terminal of
the radiator fan switch 2P connector and body
g r o u n d .
RADIATOR FAN SWITCH
2P CONNECTOR
ls there continuity?
YES Repair short in the wire between the radiator
fan switch 2P connector terminal No. 2 and main
under-hood fuse/relay box. I
NO Replace the main under-hood fuse/relay box.
I
10-17
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Table of Contents
Troubleshooting
