Infiniti FX35, FX50 (S51). Manual — part 1777
C1905, C1908, C1922, C1925, C1928 RAS CONTROL UNIT
STC-49
< DTC/CIRCUIT DIAGNOSIS >
[WITH REAR ACTIVE STEER]
C
D
E
F
H
I
J
K
L
M
A
B
STC
N
O
P
2.
Check the “DATA MONITOR” value of each DTC detected with the self-diagnosis function. Refer to
.
Is each data the standard value?
YES
>> Check each harness connector pin terminal for disconnection.
NO
>> Replace RAS control unit. Refer to
STC-109, "Removal and Installation"
Special Repair Requirement
INFOID:0000000005549673
BEFORE REPLACING RAS CONTROL UNIT
• Record the self-diagnosis results (history).
CAUTION:
• Never erase the memory (history) of self-diagnosis results when replacing RAS control unit after
diagnosis.
• Erase the memory of the self-diagnosis results (record) after printing out or recording all the val-
ues of “DATA MONITOR”.
STC-50
< DTC/CIRCUIT DIAGNOSIS >
[WITH REAR ACTIVE STEER]
C1909 RAS CONTROL UNIT
C1909 RAS CONTROL UNIT
Description
INFOID:0000000005549674
• RAS actuator and the power steering solenoid valve is controlled by each sensor signal.
• The fail-safe function stops the rear wheel angle function, when the electric components and the mechanical
components are malfunctioning.
• The protective function stops RAS system temporarily when the input signal is not inputted to RAS control
unit (When battery-power dose not work temporarily).
DTC Logic
INFOID:0000000005549675
DTC DETECTION LOGIC
DTC CONFIRMATION PROCEDURE
1.
DTC REPRODUCTION PROCEDURE
With CONSULT-III
1.
Turn the ignition switch from OFF to ON.
2.
Perform “4WAS(MAIN)/RAS/HICAS” self-diagnosis.
Without CONSULT-III
1.
Start the engine.
2.
Perform the self-diagnosis. Refer to
STC-38, "Diagnosis Description"
.
Is DTC “C1909” or “RAS warning lamp flickering pattern:11” detected?
YES
>> Proceed to diagnosis procedure. Refer to
NO
>> INSPECTION END
Diagnosis Procedure
INFOID:0000000005549676
1.
CHECK RAS CONTROL UNIT POWER SUPPLY
1.
Turn the ignition switch OFF.
2.
Disconnect RAS control unit harness connector.
3.
Check the voltage between RAS control unit harness connector terminal and ground.
4.
Turn the ignition switch ON.
CAUTION:
Never start the engine.
5.
Check the voltage between RAS control unit harness connector terminal and ground.
Is the inspection result normal?
YES
>> GO TO 2.
NG
>>
Check the following items. Repair or replace the malfunctioning parts.
• 10A fuse (#45) open
- Short among 10A fuse (#45) connector, RAS control unit harness connector No. 27 terminal and
the ground
DTC
Display items
Malfunction detected condition
Possible cause
C1909
CONTROL UNIT
[ABNORMAL6]
Malfunction has occurred inside RAS control unit.
• RAS control unit
• Harness or connector
RAS control unit
—
Voltage (Approx.)
Connector
Terminal
B37
27 Ground
0
V
RAS control unit
—
Voltage (Approx.)
Connector
Terminal
B37
27 Ground
Battery
voltage
C1909 RAS CONTROL UNIT
STC-51
< DTC/CIRCUIT DIAGNOSIS >
[WITH REAR ACTIVE STEER]
C
D
E
F
H
I
J
K
L
M
A
B
STC
N
O
P
• Open between the ignition switch and RAS control unit harness connector No. 27 terminal
• Ignition switch
2.
CHECK RAS CONTROL UNIT GROUND
Check the continuity between RAS control unit harness connector and ground.
Is the inspection result normal?
YES
>> GO TO 3.
NG
>> Repair or replace the harnesses and connectors.
3.
PERFORM SELF-DIAGNOSIS
With CONSULT-III
1.
Connect RAS control unit harness connector.
2.
Turn the ignition switch from OFF to ON.
3.
Perform “4WAS(MAIN)/RAS/HICAS” self-diagnosis.
Without CONSULT-III
1.
Connect RAS control unit harness connector.
2.
Start the engine.
3.
Perform the self-diagnosis. Refer to
STC-38, "Diagnosis Description"
.
Is DTC “C1909” or “RAS warning lamp flickering pattern:11” detected?
YES
>> Replace RAS control unit. Refer to
STC-109, "Removal and Installation"
NO
>> GO TO 4.
4.
CHECK INFORMATION
With CONSULT-III
1.
Select “DATA MONITOR” of “4WAS(MAIN)/RAS/HICAS”.
2.
Check the “DATA MONITOR” value of each DTC detected with the self-diagnosis function. Refer to
.
Is each data the standard value?
YES
>> Check each harness connector pin terminal for disconnection.
NO
>> Replace RAS control unit. Refer to
STC-109, "Removal and Installation"
Special Repair Requirement
INFOID:0000000005549677
BEFORE REPLACING RAS CONTROL UNIT
• Record the self-diagnosis results (history).
CAUTION:
• Never erase the memory (history) of self-diagnosis results when replacing RAS control unit after
diagnosis.
• Erase the memory of the self-diagnosis results (record) after printing out or recording all the val-
ues of “DATA MONITOR”.
RAS control unit
—
Continuity
Connector
Terminal
B37
34 Ground
Existed
STC-52
< DTC/CIRCUIT DIAGNOSIS >
[WITH REAR ACTIVE STEER]
C1911, C1912 RAS MOTOR POWER SUPPLY
C1911, C1912 RAS MOTOR POWER SUPPLY
Description
INFOID:0000000005549678
The power supply for RAS motor.
DTC Logic
INFOID:0000000005549679
DTC DETECTION LOGIC
DTC CONFIRMATION PROCEDURE
1.
DTC REPRODUCTION PROCEDURE
With CONSULT-III
1.
Turn the ignition switch from OFF to ON.
2.
Perform “4WAS(MAIN)/RAS/HICAS” self-diagnosis.
Without CONSULT-III
1.
Start the engine.
2.
Perform the self-diagnosis. Refer to
STC-38, "Diagnosis Description"
.
Is DTC “C1911”, “C1912” or “RAS warning lamp flickering pattern:12” detected?
YES
>> Proceed to diagnosis procedure. Refer to
NO
>> INSPECTION END
Diagnosis Procedure
INFOID:0000000005549680
1.
CHECK RAS CONTROL UNIT POWER SUPPLY
1.
Turn the ignition switch OFF.
2.
Disconnect RAS control unit harness connector.
3.
Check the voltage between RAS control unit harness connector and ground.
4.
Turn the ignition switch ON.
CAUTION:
Never start the engine.
5.
Check the voltage between RAS control unit harness connector and ground.
Is the inspection result normal?
YES
>> GO TO 2.
NG
>>
Check the following items. Repair or replace the malfunctioning parts.
• 10A fuse (#45) open
- Short among 10A fuse (#45) connector, RAS control unit harness connector No. 27 terminal and
the ground
DTC
Display items
Malfunction detected condition
Possible cause
C1911
MOTOR VOLTAGE
[LOW VOLTAGE]
RAS motor voltage error is detected.
(RAS motor voltage is low.)
• RAS motor relay
• Harness or connector
• RAS control unit
C1912
MOTOR VOLTAGE
[BAD OBSTRCT]
RAS motor voltage error is detected.
(Voltage is applied to RAS motor when RAS control unit
output is “OFF”.)
• RAS motor relay
• Harness or connector
• RAS control unit
RAS control unit
—
Voltage (Approx.)
Connector
Terminal
B37
27 Ground
0
V
RAS control unit
—
Voltage (Approx.)
Connector
Terminal
B37
27 Ground
Battery
voltage
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