Nissan Silvia. Manual — part 270
MAIN POWER SUPPLY AND GROUND CIRCUIT CHECK
=NMHA0254
Power Supply Circuit Check
NMHA0254S01
Check power supply circuit for air conditioner system.
Refer to EL-8, “Wiring Diagram — POWER —”.
DIAGNOSTIC PROCEDURE
NMHA0255
SYMPTOM:
I
A/C system does not come on.
1
CHECK POWER SUPPLY CIRCUIT FOR A/C CONTROL UNIT
1. Disconnect A/C control unit harness connector.
2. Are there approx. 12 volts between each A/C control unit connector M31 terminal No. 2 (L/OR) and body ground?
ZHA017H
OK or NG
OK
©
GO TO 2.
NG
©
Check 10A fuse (No. 15) at fuse block.
2
CHECK BODY GROUND CIRCUIT FOR A/C CONTROL UNIT
Check for continuity between A/C control unit harness connector M31 terminal No. 6 and body ground.
ZHA019H
OK or NG
OK
©
INSPECTION END
NG
©
If NG, repair harness or connector.
GI
MA
EM
LC
EC
FE
CL
MT
AT
PD
AX
SU
BR
ST
RS
BT
SC
EL
IDX
TROUBLE DIAGNOSES
A/C System (Cont’d)
HA-31
Intake Door
TROUBLE DIAGNOSIS PROCEDURE FOR INTAKE DOOR
=NMHA0135
Symptom:
I
Intake door does not change in VENT, B/L or FOOT mode.
Inspection Flow
ZHA021H
*1: HA-33
*2: HA-28
*3: HA-27
ZHA022H
SYSTEM DESCRIPTION
NMHA0136
Intake Door Motor
NMHA0136S01
The intake door motor is installed on the blower unit. Using a link
it opens and closes the intake door.
When RECIRCULATION switch is at REC (except DEF and D/F
modes), the A/C control unit sets the intake door at the “RECIR-
CULATION” position.
RECIRCULATION switch is canceled by MODE switch in DEF and
D/F modes.
TROUBLE DIAGNOSES
Intake Door
HA-32
ZHA023H
ZHA024H
DIAGNOSTIC PROCEDURE
NMHA0090
SYMPTOM: Intake door motor does not operate normally.
1
CHECK BODY GROUND CIRCUIT FOR INTAKE DOOR MOTOR
1. Disconnect intake door harness connector.
2. Does continuity exist between intake door harness connector M48 terminal No. 5 (B) and body ground?
ZHA025H
Yes or No
Yes
©
Reconnect intake door harness connector. GO TO 2.
No
©
Repair harness or connector.
GI
MA
EM
LC
EC
FE
CL
MT
AT
PD
AX
SU
BR
ST
RS
BT
SC
EL
IDX
TROUBLE DIAGNOSES
Intake Door (Cont’d)
HA-33
2
CHECK FOR A/C CONTROL UNIT OUTPUT
Are there approx. 12 volts between each A/C control unit connector M32 terminals No. 15 (G/B), 23 (G/W) and body
ground.
ZHA026H
OK or NG
OK
©
Disconnect A/C control unit connector and intake door motor connector. GO TO 3.
NG
©
Replace A/C control unit.
TROUBLE DIAGNOSES
Intake Door (Cont’d)
HA-34
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