Blower Motor Relay: Testing and Inspection
HEATER MAIN RELAYINSPECTION
1. DISCONNECT R/B NO.3
Remove the bolt and nut holding to the R/B No.3.
2. REMOVE HEATER MAIN RELAY FROM INSTRUMENT PANEL RELAY BLOCK
3. INSPECT HEATER MAIN RELAY
a. Inspect the relay continuity.
1. Using an ohmmeter, check that there is continuity between terminals 1 and 2.
If there is no continuity, replace the relay.
2. Check that there is continuity between terminals 3 and 4.
If there is no continuity, replace the relay.
3. Check that there is no continuity between terminals 3 and 5.
If there is continuity, replace the relay.
b. Inspect relay operation.
1. Apply battery positive voltage across terminals 1 and 2.
2. Using an ohmmeter, check that there is continuity between terminals 3 and 5.
If there is no continuity, replace the relay.
3. Check that there is no continuity between terminals 3 and 4.
If there is continuity, replace the relay.
4. REINSTALL HEATER MAIN RELAY
5. RECONNECT INSTRUMENT PANEL RELAY BLOCK