Radiator Fan Control Module
- Perform following tests with ignition on and radiator fan control module connected. Any problem should be corrected before advancing through tests. Before performing any tests, check fuses No. 9 and 23 in dash fuse box. Check fuses No. 32, 33, 45 and 47 in underhood fuse/relay box. Use illustration for radiator fan control module terminal identification. See Fig 1 . If all tests are okay, replace radiator fan control module with known good part.
- Check for voltage between terminal "A" (Black wire) and body ground. Voltage should be less than one volt. If result is not within specification, repair open to body ground.
- Check terminal "G" (White/Green wire) for battery voltage. If battery voltage does not exist, recheck fuse No. 45. If fuse is okay, repair open in White/Green wire.NOTE: Radiator fan control module has 2 Black/Yellow wires.
- Check for battery voltage at terminal "F" (Black/Yellow(4) wire). If battery voltage does not exist, recheck fuse No. 23. If fuse is okay, repair open in Black/Yellow(4) wire.
- Check for battery voltage at terminal "C" (Black/Yellow(3) wire). If battery voltage does not exist, recheck fuse No. 9. If fuse is okay, repair open in Black/Yellow(3) wire.
- Check for battery voltage at terminal "B" (Yellow/White wire). Turn ignition on. Check for battery voltage at terminal "D" (Yellow wire). If battery voltage does not exist on both terminals, replace radiator fan control module. Before connecting replacement radiator fan control module, check for continuity between Yellow/White wire and ground using an ohmmeter. Check for continuity between Yellow wire and ground. Continuity should not exist. If continuity exists, DO NOT connect control module.
- Check for voltage between terminal "E" (Blue/Red wire) and body ground. Turn ignition on. Condenser fan and radiator fan should come on. If fans do not turn on, check for open in Blue/Red wire between radiator fan control module and condenser fan relay and radiator fan relay. If circuits are okay, check for open in Yellow/White wire between radiator fan control module and condenser fan relay. Also check for open in Yellow wire between radiator fan control module and radiator fan relay. If circuits are okay, test both fan relays.
- Check for voltage at terminal "H" (White/Yellow wire). With coolant temperature less than 223°F (106°C), voltage should be about 11 volts. If voltage is not as specified, check coolant temperature switch "B". Check for short to body ground. If ground is okay, replace radiator fan control module.