Rear Blower Motor Middle Speed Circuit Troubleshooting
Rear Blower Motor Middle Speed Circuit Troubleshooting1. Remove the rear blower unit.
2. Remove the rear blower motor middle relay, and test it.
Is the relay OK?
YES - Go to step 3.
NO - Replace the rear blower motor middle relay.
3. Disconnect the rear blower resistor.
4. Measure the resistance between the No.1 and No.4 terminals of the rear blower resistor.
Is there about 1.4 Ohm?
YES - Go to step 5.
NO - Replace the rear blower resistor.
5. Check for continuity between the No.4 terminal of the rear blower resistor 5P connector and the No.2 terminal of the rear blower motor middle relay 5P socket.
Is there continuity?
YES - Go to step 6.
NO - Repair open in the wire between the rear blower resistor and the rear blower motor middle relay.
6. Check for continuity between the No.1 terminal of the rear blower motor middle relay 5P socket and body ground.
Is there continuity?
YES - Go to step 7.
NO - Check for an open in the wire between the rear blower motor middle relay and body ground If the wire is OK, check for poor ground at G582.
7. Turn the ignition switch ON (II).
8. Measure the voltage between the No.5 terminal of the rear blower motor middle relay 5P socket and body ground.
Is there battery voltage?
YES - Go to step 9.
NO - Repair open in the wire between the No.3 fuse in the driver's under-dash fuse/relay box and the rear blower motor middle relay.
9. Turn the ignition switch OFF.
10. Disconnect the rear heater-A/C main switch 10P connector and the rear heater-A/C passenger's control panel 10P connector.
11. Check for continuity between the No.3 terminal of the rear blower motor middle relay 5P socket and the No.3 terminal of the rear heater-A/C main switch 10P connector, and between the No.3 terminal of the rear blower motor middle relay 5P socket and the No.3 terminal of the rear heater-A/C passenger's control panel 10P connector.
Is there continuity?
YES - Test the rear heater-A/C main switch and the rear heater-A/C passenger's control panel. Replace the switch as needed.
NO - Repair open in the wire between the rear blower motor middle relay and the rear heater-A/C main switch, or between the rear blower motor middle relay and the rear heater-A/C passenger's control panel.