2008 INFINITI QX56 Factory Service Manual

Page 1689 of 4083

INFINITI QX56 2008  Factory Service Manual EC-390
< COMPONENT DIAGNOSIS >[VK56DE]
ASCD BRAKE SWITCH
ASCD BRAKE SWITCH
Component DescriptionINFOID:0000000001365863
When the brake pedal is depressed, ASCD brake switch is turned
OFF and stop lamp

Page 1690 of 4083

INFINITI QX56 2008  Factory Service Manual ASCD BRAKE SWITCHEC-391
< COMPONENT DIAGNOSIS > [VK56DE]
C
D
E
F
G H
I
J
K L
M A
EC
NP
O
OK or NG
OK >>
INSPECTION END
NG >> GO TO 7.
3.CHECK ASCD BRAKE SWITCH POWER SUPPLY CIRCUIT
1. Turn ignition sw

Page 1691 of 4083

INFINITI QX56 2008  Factory Service Manual EC-392
< COMPONENT DIAGNOSIS >[VK56DE]
ASCD BRAKE SWITCH
4. Also check harness for short to ground and short to power.
OK or NG
OK >> GO TO 6.
NG >> Repair open circuit or short to ground or short to

Page 1692 of 4083

INFINITI QX56 2008  Factory Service Manual ASCD BRAKE SWITCHEC-393
< COMPONENT DIAGNOSIS > [VK56DE]
C
D
E
F
G H
I
J
K L
M A
EC
NP
O
10.CHECK STOP LAMP SWITCH
Refer to  EC-393, "
Component Inspection".
OK or NG
OK >> GO TO 11.
NG >> Replace sto

Page 1693 of 4083

INFINITI QX56 2008  Factory Service Manual EC-394
< COMPONENT DIAGNOSIS >[VK56DE]
ASCD INDICATOR
ASCD INDICATOR
Component DescriptionINFOID:0000000001365868
ASCD indicator lamp illuminates to indicate ASCD 
operation status. Lamp has two indic

Page 1694 of 4083

INFINITI QX56 2008  Factory Service Manual COOLING FANEC-395
< COMPONENT DIAGNOSIS > [VK56DE]
C
D
E
F
G H
I
J
K L
M A
EC
NP
O
COOLING FAN
Diagnosis ProcedureINFOID:0000000001351874
1.CHECK POWER SUPPLY CIRCUIT
1. Turn ignition switch OFF.
2. D

Page 1695 of 4083

INFINITI QX56 2008  Factory Service Manual EC-396
< COMPONENT DIAGNOSIS >[VK56DE]
COOLING FAN
2. Supply cooling fan motor terminals with battery voltage and
check operation.
Cooling fan motor should operate.
If NG, replace cooling fan motor.
A

Page 1696 of 4083

INFINITI QX56 2008  Factory Service Manual ELECTRICAL LOAD SIGNALEC-397
< COMPONENT DIAGNOSIS > [VK56DE]
C
D
E
F
G H
I
J
K L
M A
EC
NP
O
ELECTRICAL LOAD SIGNAL
DescriptionINFOID:0000000001365872
The electrical load signal (Headlamp switch sign