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HTR SUB1 RELAY Toyota Corolla IX

Engine Control System & Component Testing - 4-CYLINDER 1 illustration ~167 words

HTR SUB1 RELAY

Note. HTR SUB1 relay may also be referred to as heater sub relay.

Scheme 228

Scheme 228: ECHO
Scheme 228: ECHO
  1. Remove HTR SUB1 relay from fuse/relay box located at driver's side front corner of engine compartment, just in front of strut tower. (Scheme 228)
  2. Note terminals on HTR SUB1 relay. (Scheme 228) To test HTR SUB1 relay continuity, using ohmmeter, check that continuity exists between terminals No. 1 and 2 on HTR SUB1 relay and that no continuity exists between terminals No. 3 and 5 on HTR SUB1 relay. If continuity and no continuity are as specified, go to next step. If continuity and no continuity are not as specified, replace HTR SUB1 relay.
  3. To test HTR SUB1 relay operation, apply battery voltage and ground to terminals No. 1 and 2 on HTR SUB1 relay. Using ohmmeter, check that continuity exists between terminals No. 3 and 5 on HTR SUB1 relay. Replace HTR SUB1 relay if continuity does not exist between terminals No. 3 and 5.