Nissan Silvia. Instruction — part 276
5
CHECK GROUND CIRCUIT FOR PTC.
Check circuit continuity between PTC harness connector M35 terminal No. G (B) and body ground.
ZHA090H
OK or NG
OK
©
Disconnect A/C control unit connector. GO TO 6.
NG
©
Repair harness or connector.
6
CHECK CIRCUIT CONTINUITY BETWEEN AIR MIX DOOR MOTOR AND A/C CONTROL UNIT
Check circuit continuity between PTC harness connector M35 terminal No. 21 (W/L), + (L/OR) and A/C control unit har-
ness connector M31 terminal No. 2 (L/OR), M32 terminal No. 21 (W/L).
ZHA091H
Continuity should exist.
If OK, check harness for short.
OK or NG
OK
©
GO TO 7.
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
Air Mix Door (Cont’d)
HA-55
7
CHECK FOR OUTPUT OF AUTO AMP.
Are there approx. 12 volts between air mix door motor harness connector M27 terminal No. 4 (R), 5 (R/W) and body
ground?
ZHA069H
Yes or No
Yes
©
GO TO 8.
No
©
Replace A/C control unit.
8
CHECK POWER SUPPLY FOR PBR.
Are there approx. 12 volts between air mix door motor harness connector M75 terminal No. 3 (L/OR) and body ground?
ZHA043H
Yes or No
Yes
©
Disconnect air mix door motor connector. GO TO 9.
No
©
Check 10A (No. 19) fuse at fuse block. Refer to EL-8, “Wiring Diagram — POWER
—”.
TROUBLE DIAGNOSES
Air Mix Door (Cont’d)
HA-56
9
CHECK GROUND CIRCUIT FOR PBR.
Check circuit continuity between air mix door motor harness connector M27 terminal No. 1 (B) and body ground.
ZHA044H
OK or NG
OK
©
Disconnect A/C control unit connector. GO TO 10.
NG
©
Repair harness or connector.
10
CHECK CIRCUIT CONTINUITY BETWEEN AIR MIX DOOR MOTOR AND A/C CONTROL UNIT
Check circuit continuity between air mix door motor harness connector M27 terminal No. 4 (R), 5 (L/W) and A/C control
unit harness connector M32 terminal No. 14 (R/W), 22 (R).
ZHA045H
Continuity should exist.
If OK, check harness for short.
OK or NG
OK
©
Replace air mix door motor.
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
Air Mix Door (Cont’d)
HA-57
ZHA046H
CONTROL LINKAGE ADJUSTMENT
NMHA0257
Air Mix Door
NMHA0257S01
Push air mix door lever in direction of arrow and attach air mix door
to rod holder.
1.
Install air mix door motor on heater unit and connect it to main
harness.
Make sure lever of air mix door is fitted into the slit of the air
mix door link.
2.
Turn ignition switch to ON.
3.
Slide temperature control lever to full cold.
4.
Move air mix door by hand to maximum cold position and hold
it.
5.
While holding air mix door, adjust length of temperature con-
trol rod and connect it to air mix door lever.
6.
Check that air mix door operates properly when temperature
control lever is slid to full hot and full cold.
TROUBLE DIAGNOSES
Air Mix Door (Cont’d)
HA-58
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