2008 INFINITI QX56 Factory Service Manual

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Page 3097 of 4083

INFINITI QX56 2008 Factory Service Manual SCS-14
< COMPONENT DIAGNOSIS >
C1806 VEHICLE HEIGHT SENSOR LOCKING MALFUNCTION
C1806 VEHICLE HEIGHT SENSOR LOCKING MALFUNCTION
DescriptionINFOID:0000000001731975
The vehicle height sensor operates on

Page 3098 of 4083

INFINITI QX56 2008 Factory Service Manual C1807 SENSOR 5V MALFUNCTIONSCS-15
< COMPONENT DIAGNOSIS >
C
DF
G H
I
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K L
M A
B
SCS
N
O P
C1807 SENSOR 5V MALFUNCTION
DescriptionINFOID:0000000001731978
The vehicle height sensor operates on a 5 volt

Page 3099 of 4083

INFINITI QX56 2008 Factory Service Manual SCS-16
< COMPONENT DIAGNOSIS >
C1808 INTEGRAL TIME MALFUNCTION SUPPLYING AIR
C1808 INTEGRAL TIME MALFUNCTION SUPPLYING AIR
DescriptionINFOID:0000000001731981
The suspension air compressor is supplied

Page 3100 of 4083

INFINITI QX56 2008 Factory Service Manual POWER SUPPLY AND GROUND CIRCUITSCS-17
< COMPONENT DIAGNOSIS >
C
DF
G H
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M A
B
SCS
N
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POWER SUPPLY AND GROUND CIRCUIT
SUSPENSION CONTROL UNIT
SUSPENSION CONTROL UNIT : Diagnosis ProcedureINF

Page 3101 of 4083

INFINITI QX56 2008 Factory Service Manual SCS-18
< COMPONENT DIAGNOSIS >
POWER SUPPLY AND GROUND CIRCUIT
1. Disconnect the suspension air compressor connector C9.
2. Turn ignition switch ON.
3. Select "COMPRESSOR" under AIR LEVELIZER active t

Page 3102 of 4083

INFINITI QX56 2008 Factory Service Manual POWER SUPPLY AND GROUND CIRCUITSCS-19
< COMPONENT DIAGNOSIS >
C
DF
G H
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K L
M A
B
SCS
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O P
1. Disconnect height sensor connector C8.
2. Turn the ignition switch ON.
3. Check voltage between the h

Page 3103 of 4083

INFINITI QX56 2008 Factory Service Manual SCS-20
< COMPONENT DIAGNOSIS >
COMPRESSOR MOTOR RELAY
COMPRESSOR MOTOR RELAY
DescriptionINFOID:0000000001731987
Receives suspension air compressor ON signal from suspension control unit. When activate

SCS-20
< COMPONENT DIAGNOSIS >
COMPRESSOR MOTOR RELAY
COMPRESSOR MOTOR RELAY
DescriptionINFOID:0000000001731987
Receives suspension air compressor ON signal from suspension control unit. When activated, the compressor
motor relay supplies power to the suspension air compressor.
Component Function CheckINFOID:0000000001731988
1.CHECK COMPRESSOR MOTOR RELAY OPERATION
CAUTION:
The "COMPRESSOR" active test will remain ON until it is turned off using CONSULT-III. Allowing the
compressor to run for an extended period of time may cause damage to the suspension control sys-
tem components due to excessive air pressure.
CONSULT-III
1. Turn ignition ON.
2. Select "COMPRESSOR" of AIR LEVELIZER active test items.
3. While operating test item, check that the suspension air compressor turns ON.
Does the suspension air compressor operate properly?
YES >> Compressor motor relay and suspension air compressor are operating normally.
NO >> Refer to SCS-20, "
Diagnosis Procedure"
Diagnosis ProcedureINFOID:0000000001731989
1.CHECK COMPRESSOR "ON" SIGNAL FROM SUSPENSION CONTROL UNIT
CONSULT-III
1. Turn ignition switch ON.
2. Disconnect compressor motor relay connector E130.
3. Select "COMPRESSOR" of AIR LEVELIZER active test items.
4. While operating test item, check voltage to compressor motor relay connector E130 terminal 2.
Is battery voltage present while operating test item?
YES >> GO TO 3.
NO >> GO TO 2.
2.CHECK COMPRESSOR "ON" SIGNAL CIRCUIT
1. Turn ignition switch OFF.
2. Disconnect suspension control unit connector B3.
3. Check continuity between suspension control unit connector B3 (A) terminal 1 and compressor motor relay connector E130 (B)
terminal 2.
4. Check continuity between suspension control unit connector B3 (A) terminal 1 and ground.ON : Compressor turns ON
OFF : Compressor turns OFF
(+)
(-)Voltage
Connector Terminal
E130 2Ground Battery voltage
ALEIA0030GB
AB
Continuity
Connector Terminal Connector Terminal
B3 1E 1302 Y es
ALEIA0031GB
Revision: March 2010 2008 QX56

Page 3104 of 4083

INFINITI QX56 2008 Factory Service Manual COMPRESSOR MOTOR RELAYSCS-21
< COMPONENT DIAGNOSIS >
C
DF
G H
I
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K L
M A
B
SCS
N
O P
Are the continuity test results as specified?
YES >> Replace the suspension control unit. Refer to RSU-25, "Remov

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