TROUBLE DIAGNOSES — Diagnostic Procedure 3 (SYMPTOM: Intake door does not change.)
HA-74flowchartL.H.D. uses G/B (Green/Black) for pin 9 and G/Y (Green/Yellow) for pin 11; R.H.D. swaps the colour-to-pin allocation per the diagrams. Continuity test is polarity-sensitive on L.H.D. (only one direction conducts).
Diagnostic Procedure 3
SYMPTOM: Intake door does not change.
WARNING
Perform PRELIMINARY CHECK 1 (FOR L.H.D. MODEL ONLY) and Main Power Supply and Ground Circuit Check before referring to the following flow chart.
Diagnostic Procedure 3 — intake door does not change
1
[A] CHECK POWER SUPPLY FOR INTAKE DOOR MOTOR. Disconnect intake door motor harness connector. Do approx. 12 volts exist between intake door motor harness terminal No. 10 and body ground?
N.G.
Check 10A fuses at fuse block. (Refer to "POWER SUPPLY ROUTING" in EL section and A/C ELECTRICAL CIRCUIT.)
O.K.
2
[B] CHECK BODY GROUND CIRCUIT FOR INTAKE DOOR MOTOR. Does continuity exist between intake door motor harness terminal No. 9 and body ground when REC switch is ON? Does continuity exist between intake door motor harness terminal No. 11 and body ground when REC switch is OFF?
O.K.
Replace intake door motor.
N.G.
3
Disconnect push control unit harness connector.
4
[C] Check circuit continuity between push control unit harness terminal No. 9 (or 11) and intake door motor harness terminal No. 9 (or 11).
O.K.
5
Replace control amp. built-in push control unit.
NOTE
(re step C): if the result is N.G. after checking circuit continuity, repair harness or connector.