2008 INFINITI QX56 Factory Service Manual

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
J
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
I
J
K L
M A
B
SCS
N
O P
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
I
J
K L
M A
B
SCS
N
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

Page 3104 of 4083

INFINITI QX56 2008  Factory Service Manual COMPRESSOR MOTOR RELAYSCS-21
< COMPONENT DIAGNOSIS >
C
DF
G H
I
J
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