Expedition 4WD V8-4.6L SOHC VIN 6 (1997)
Power Window Relay: Testing and Inspection
73 Digital Multimeter
Special Tool(s)
Testing of an ISO relay can be accomplished through the use of three No. 10 (or larger gauge) jumper wires and 73 Digital Multimeter. Remove (unplug)
the relay to be tested from the engine compartment fuse junction panel, I/P fuse junction panel or individual connector.
Mini ISO Relay
Using Digital Multimeter, check for the continuity between terminal 85 and all other terminals. If the resistance is 5 ohms or less between terminal 85
and any other terminal, replace the relay. If resistance is greater than 5 ohms, continue with the test. Use two jumper wires to connect relay terminals
86 and 30 directly to the positive battery terminal. Use Digital Multimeter set in the volts position to check for voltage at terminal 87A. If battery
voltage is not indicated, replace the relay. If battery voltage is indicated, connect a third jumper wire to terminal 85 and ground the jumper wire to a
known good ground. Check for voltage at terminal 87. If battery voltage is not indicated, replace the relay.
Micro ISO Relay
Use Digital Multimeter to check for the continuity between terminal 2 and all other terminals. If resistance is 5 ohms or less between terminal 2 and
any other terminal, replace the relay. If resistance is greater than 5 ohms, continue with the test. Use two jumper wires to connect relay terminals 1 and
3 directly to the positive battery terminal. Use Digital Multimeter set in the volts position to check for voltage at terminal 4. If battery voltage is not
indicated, replace the relay. If battery voltage is indicated, connect a third jumper wire to terminal 2 and ground the jumper wire to a known good
ground. Check for voltage at terminal 5. If battery voltage is not indicated, replace the relay.
