Check body ground circuit for auto amp. with ignition switch OFF.
1. Disconnect auto amp. harness connector.
2. Connect ohmmeter from harness side.
3. Check for continuity between terminal No.
p17and body
ground.
Ohmmeter terminal
Continuity
!@
p17Body groundYe s
Diagnostic Procedure 1
SYMPTOM: Blower motor does not rotate at all. (Fan switch
ªAUTOº, ª1º, ª2º, ª3º, ª4º)
lPerform PRELIMINARY CHECK 2 before referring to the
following flow chart.
CHECK POWER SUPPLY FOR
BLOWER MOTOR.
Disconnect blower motor harness con-
nector.
Do approx.12 voltsexist between
blower motor harness terminal No.
p1
and body ground?
OK
ENG
Check 15A fuses (No.
,at fuse block.
(Refer to ªPOWER SUP-
PLY ROUTINGº in EL
section and Wiring Dia-
gram.)
Check circuit continuity between
blower motor harness terminal No.
p2
and body ground.
OK
ENG
Reconnect blower motor
harness connector.
CHECK BLOWER MOTOR.
NG
Replace blower motor.
CHECK BLOWER MOTOR CIRCUIT
BETWEEN BLOWER MOTOR AND
RESISTOR.
Do approx.12 voltsexist between
resistor harness terminal No.
p5and
body ground?
OK
ENG
Disconnect blower motor
and resistor harness
connectors.
Note
Check circuit continuity
between blower motor
harness terminal No.
p2and resistor harness
terminal No.
p5.
pA
(Go to next page.)
Note:
If the result is NG or No after checking circuit continuity, repair harness or
connector.
YHA240 Auto amp. connector
KHA118
Blower motor
connector
KHA119
Blower motor
connector
Continuity should exist.
KHA120
Resistor connec-
tor
YHA244
Blower motor
connectorResistor
connector
H
H
H
H
H
H
TROUBLE DIAGNOSESAUTO
Main Power Supply and Ground Circuit
Check (Cont'd)
HA-52
Diagnostic Procedure 9
SYMPTOM: Intake door does not change.
lPerform PRELIMINARY CHECK 1 and Main Power Sup-
ply and Ground Circuit Check before referring to the fol-
lowing flow chart.
CHECK POWER SUPPLY FOR
INTAKE DOOR MOTOR.
Disconnect intake door motor harness
connector.
Do approx.12 voltsexist between
intake door motor harness terminal No.
p1and body ground?
OK
ENG
Check 10A fuses (No.
20) at fuse block.
(Refer to ªPOWER SUP-
PLY ROUTINGº in EL
section and Wiring Dia-
gram.)
CHECK BODY GROUND CIRCUIT
FOR INTAKE DOOR MOTOR.
Does continuity exist between intake
door motor harness terminal No.
p3
and body ground when REC switch is
ON?
Does continuity exist between intake
door motor harness terminal No.
p4
and body ground when REC switch is
OFF?
OK
ENG
Disconnect control panel
harness connector.
Note
Check circuit continuity
between control panel
harness terminal No.
p4(p6) and intake
door motor harness ter-
minal No.
p3(p4)?
OK
Replace intake door motor.
Replace A/C control
panel.
Note:
If the result is NG or No after checking circuit continuity, repair harness or
connector.
YHA261
Intake door motor
connector
NHA452
Intake door motor
connectorContinuity should exist when
test leads are connected as
shown; itshould not exist
when test leads are reversed.
Intake door motor
connector
YHA265
Control panel
connectorIntake door motor
connector
H
H
HH
TROUBLE DIAGNOSESAUTO
HA-69
