Infiniti QX4 (R50). Manual — part 486
RHA888H
Multiplex Communication Circuit
DIAGNOSTIC PROCEDURE
NBHA0118
SYMPTOM:
I
A/C system does not come on.
I
A/C system can not controlled.
1
CHECK CIRCUIT CONTINUITY BETWEEN DISPLAY & NAVI CONTROL UNIT AND AUTO AMP.
Check circuit continuity between each terminal on Display & Navigation control unit and on auto amp.
RHA889H
Continuity should exist.
If OK, check harness for short.
OK or NG
OK
©
GO TO 2.
NG
©
1. Repair harness or connector.
2. Go to “OPERATIONAL CHECK”, HA-66.
Confirm that A/C system is in good order.
2
CHECK MULTI-PLEX COMMUNICATION SIGNAL
Do approx. 3.5 volts exist between Display & NAVI control unit harness terminal Nos. 37, 38 and body ground?
RHA890H
Yes or No
Yes
©
GO TO 3.
No
©
1. Replace auto amp.
2. Go to “OPERATIONAL CHECK”, HA-66.
Confirm that A/C system is in good order.
TROUBLE DIAGNOSES
Multiplex Communication Circuit
HA-142
3
CHECK MULTIPLEX COMMUNICATION SIGNAL
Do approx. 3.5 volts exist between auto amp. harness terminal No. 40 and body ground?
RHA891H
Yes or No
Yes
©
INSPECTION END.
No
©
1. Replace Display & NAVI control unit.
2. Go to “OPERATIONAL CHECK”, HA-66.
Confirm that A/C system is in good order.
GI
MA
EM
LC
EC
FE
AT
TF
PD
AX
SU
BR
ST
RS
BT
SC
EL
IDX
TROUBLE DIAGNOSES
Multiplex Communication Circuit (Cont’d)
HA-143
HFC-134a (R-134a) Service Procedure
NBHA0070
SETTING OF SERVICE TOOLS AND EQUIPMENT
NBHA0070S01
DISCHARGING REFRIGERANT
NBHA0070S0101
WARNING:
Avoid breathing A/C refrigerant and lubricant vapor or mist. Exposure may irritate eyes, nose and
throat. Remove HFC-134a (R-134a) from A/C system using certified service equipment meeting require-
ments of SAE J2210 (R-134a recycling equipment) or J2209 (R-134a recovery equipment). If acciden-
tal system discharge occurs, ventilate work area before resuming service. Additional health and safety
information may be obtained from refrigerant and lubricant manufacturers.
SHA179FA
Evacuating System and Charging Refrigerant
NBHA0070S0102
SHA180FA
SERVICE PROCEDURE
HFC-134a (R-134a) Service Procedure
HA-144
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