Infiniti QX4 (R50). Manual — part 470
Mode Door Control Specification
NBHA0052S03
RHA135G
RHA505G
COMPONENT DESCRIPTION
NBHA0053
The mode door motor is attached to the heater unit. It rotates so
that air is discharged from the outlet set by the auto amplifier. Motor
rotation is conveyed to a link which activates the mode door.
RHA488GA
DIAGNOSTIC PROCEDURE FOR MODE DOOR MOTOR
AND AIR MIX DOOR MOTOR CIRCUIT
NBHA0104
SYMPTOM: Mode door motor and/or air mix door motor does
not operate normally.
TROUBLE DIAGNOSES
Mode Door Motor (Cont’d)
HA-78
1
CHECK POWER SUPPLY FOR AUTO AMP. (LCU) SIDE
Do approx. 12 volts exist between auto amp. (LCU) harness terminal No. 21 and body ground?
RHA819H
NOTE:
If the result is NG or No after checking circuit continuity, repair harness or connector.
Yes or No
Yes
©
GO TO 2.
No
©
Replace auto amp. (LCU).
2
CHECK SIGNAL FOR AUTO AMP. (LCU) SIDE
Do approx. 5.5 volts exist between auto amp. (LCU) terminals No. 16 or 14 and body ground?
RHA820H
NOTE:
If the result is NG or No after checking circuit continuity, repair harness or connector.
Yes or No
Yes
©
GO TO 3.
No
©
Replace auto amp. (LCU).
GI
MA
EM
LC
EC
FE
AT
TF
PD
AX
SU
BR
ST
RS
BT
SC
EL
IDX
TROUBLE DIAGNOSES
Mode Door Motor (Cont’d)
HA-79
3
CHECK POWER SUPPLY FOR MOTOR SIDE
Do approx. 12 volts exist between door motor (LCU) harness terminal No. 21 and body ground?
RHA489GC
Yes or No
Yes
©
GO TO 4.
No
©
Repair harness or connector.
4
CHECK SIGNAL FOR MOTOR SIDE
Do approx. 5.5 volts exist between door motor (LCU) terminal No. 16 and body ground?
RHA490G
Yes or No
Yes
©
GO TO 5.
No
©
Repair harness or connector.
5
CHECK MOTOR GROUND CIRCUIT
Does continuity exist between door motor (LCU) harness terminal No. 32 and body ground?
RHA491G
Yes or No
Yes
©
GO TO 6.
No
©
Repair harness or connector.
TROUBLE DIAGNOSES
Mode Door Motor (Cont’d)
HA-80
6
CHECK MOTOR OPERATION
Disconnect and reconnect the motor connector and confirm the motor operation.
OK or NG
OK (Return to operate
normally)
©
Poor contacting the motor connector
NG (Does not operate
normally)
©
GO TO 7.
7
CHECK MODE DOOR MOTOR OPERATION
1. Disconnect the mode door motor and air mix door motor connector.
2. Reconnect the mode door motor and confirm the motor operation.
OK or NG
OK (Mode door motor
operates normally)
©
Replace the air mix door motor.
NG (Mode door motor
does not operate nor-
mally)
©
GO TO 8.
8
CHECK AIR MIX DOOR MOTOR OPERATION
1. Disconnect the mode door motor connector.
2. Reconnect the air mix door motor and confirm the air mix door motor operation.
OK or NG
OK (Air mix door motor
operates normally)
©
Replace mode door motor.
NG (Air mix door motor
does not operate nor-
mally)
©
Replace auto amp.
RHA505G
CONTROL LINKAGE ADJUSTMENT
NBHA0091
Mode Door
NBHA0091S01
1.
Install mode door motor on heater unit and connect it to main
harness.
2.
Set up code No. in Self-diagnosis STEP 4. Refer to HA-45.
3.
Move side link by hand and hold mode door in DEF mode.
4.
Attach mode door motor rod to side link rod holder.
5.
Make sure mode door operates properly when changing from
code No.
to
by pushing DEF switch.
VENT
B/L
B/L
FOOT
D/F
DEF
GI
MA
EM
LC
EC
FE
AT
TF
PD
AX
SU
BR
ST
RS
BT
SC
EL
IDX
TROUBLE DIAGNOSES
Mode Door Motor (Cont’d)
HA-81
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