2007 INFINITI M35 control unit

BRC-42
[VDC/TCS/ABS]
TROUBLE DIAGNOSIS FOR SYSTEM
Revision: 2007 April2007 M35/M45
3. CHECK STEERING ANGLE SENSOR HARNESS
1. Check CAN communication system. Refer to BRC-48, "
CAN Communication Circuit" .
2. Turn ignition switch OFF and disconnect steering angle sensor connector.
3. Check continuity between steering angle sensor harness con-
nector M47 terminal 2 and ground.
4. Turn ignition switch ON and check voltage between steering
angle sensor harness connector M47 terminal 3 and ground.
OK or NG
OK >> GO TO 4.
NG >>

Repair or replace malfunctioning components.

Perform the self-diagnosis, and make sure that the
result shows “NO DTC IS DETECTED”.
4. CHECK DATA MONITOR
1. Turn ignition switch OFF and connect the steering angle sensor connector and ABS actuator and electric
unit (control unit) connector.
2. Select “STR ANGLE SIG” in “DATA MONITOR” and check steering angle sensor signal.
OK or NG
OK >> Perform self-diagnosis.
NG >>

Replace spiral cable (steering angle sensor) and adjust neutral position of steering angle sen-
sor. Refer to BRC-6, "
Adjustment of Steering Angle Sensor Neutral Position" .

Perform the self-diagnosis, and make sure that the result shows “NO DTC IS DETECTED”.
Steering angle sensor Ground Continuity
2—Yes
SFIA2970E
Steering angle sensor Ground Voltage
3—Battery voltage
(Approx. 12 V)
SFIA2971E
Steering condition STR ANGLE SIG (DATA MONITOR)
Driving straight – 2.5 ° to + 2.5 °
Turn 90° to right Approx. + 90 °
Turn 90° to left Approx. – 90 °

TROUBLE DIAGNOSIS FOR SYSTEM
BRC-43
[VDC/TCS/ABS]
C
D
E
G
H
I
J
K
L
MA
B
BRC
Revision: 2007 April2007 M35/M45
Stop Lamp Switch CircuitNFS000QU
INSPECTION PROCEDURE
1. CHECK SELF-DIAGNOSIS RESULTS
Check self-diagnosis results.
Is above displayed on the self-diagnosis display?
YES >> GO TO 2.
NO >> INSPECTION END
2. CHECK CONNECTOR
1. Turn ignition switch OFF and disconnect stop lamp switch connector E124 and ABS actuator and electric
unit (control unit) connector E30, check terminal for deformation, disconnection, looseness, and so on. If
any malfunction is found, repair or replace terminal.
2. Reconnect connectors securely.
3. Start engine.
4. Repeat pumping brake pedal carefully several times, and perform self-diagnosis.
OK or NG
OK >> INSPECTION END
NG >> GO TO 3.
3. CHECK STOP LAMP SWITCH CIRCUIT
1. Turn ignition switch OFF and disconnect ABS actuator and electric unit (control unit) connector E30.
2. Check voltage between ABS actuator and electric unit (control
unit) harness connector E30 terminal 30 and ground.
OK or NG
OK >> Perform self-diagnosis.
NG >>

Repair or replace stop lamp switch circuit.

Perform the self-diagnosis, and make sure that the result shows “NO DTC IS DETECTED”.
Self-diagnosis results
STOP LAMP SW
SFIA3038E
ABS actuator and electric unit (control unit) Ground Condition Voltage
30 —Brake pedal depressed Battery voltage (Approx. 12 V)
Brake pedal not depressed Approx. 0V

BRC-44
[VDC/TCS/ABS]
TROUBLE DIAGNOSIS FOR SYSTEM
Revision: 2007 April2007 M35/M45
Yaw Rate/Side G Sensor CircuitNFS000QV
CAUTION:

Sudden turns (such as spin turns, acceleration turns), drifting, etc., when VDC function is off (VDC
OFF switch “ON”) may cause yaw rate/side G sensor system to indicate a malfunction. However,
this is not a malfunction, if normal operation can be resumed after restarting engine. Then erase
memory of self-diagnosis.

If vehicle is on turn-table at entrance to parking garage, or on other moving surface, VDC OFF
indicator lamp may illuminate and CONSULT-II self-diagnosis may indicate yaw rate sensor sys-
tem malfunction. However, in this case there is no malfunction in yaw rate sensor system. Take
vehicle off of turn-table or other moving surface, and start engine. Results will return to normal.
And after doing spin turns or acceleration turns with VDC function is being off (VDC OFF switch
“ON”), too, the results will return to a normal condition by re-starting vehicle.
INSPECTION PROCEDURE
1. CHECK SELF-DIAGNOSIS RESULTS
Check self-diagnosis results.
Is above displayed on the self-diagnosis display?
YES >> GO TO 2.
NO >> INSPECTION END
2. CHECK CONNECTOR
1. Turn ignition switch OFF and disconnect yaw rate/side G sensor connector M145 and ABS actuator and
electric unit (control unit) connector E30, check terminal for deformation, disconnection, looseness, and
so on. If any malfunction is found, repair or replace terminal.
2. Reconnect connector and perform self-diagnosis.
OK or NG
OK >> INSPECTION END
NG >> GO TO 3.
3. CHECK YAW RATE/SIDE G SENSOR POWER SUPPLY CIRCUIT
1. Turn ignition switch OFF and disconnect yaw rate/side G sensor connector M145.
2. Turn ignition switch ON or OFF and check voltage between yaw
rate/side G sensor harness connector M145 terminal 3 and
ground.
OK or NG
OK >> GO TO 4.
NG >>

Repair or replace malfunctioning components.

Perform the self-diagnosis, and make sure that the result shows “NO DTC IS DETECTED”.
Self-diagnosis results
YAW RATE SENSOR
SIDE G-SEN CIRCUIT
Yaw rate/side G sensor Ground Condition Voltage
3—Ignition switch ONBattery voltage
(Approx. 12 V)
Ignition switch OFF Approx. 0 V
SFIA3044E

TROUBLE DIAGNOSIS FOR SYSTEM
BRC-45
[VDC/TCS/ABS]
C
D
E
G
H
I
J
K
L
MA
B
BRC
Revision: 2007 April2007 M35/M45
4. CHECK YAW RATE/SIDE G SENSOR HARNESS
1. Turn ignition switch OFF and disconnect Yaw rate/side G sensor connector M145 and ABS actuator and
electric unit (control unit) connector E30.
2. Check continuity between Yaw rate/side G sensor harness con-
nector M145 and ABS actuator and electric unit (control unit)
harness connector E30.
OK or NG
OK >> GO TO 5.
NG >>

Repair or replace malfunctioning components.

Perform the self-diagnosis, and make sure that the result shows “NO DTC IS DETECTED”.
5. CHECK DATA MONITOR
1. Connect the Yaw rate/side G sensor connector and ABS actuator and electric unit (control unit) connector.
2. Select “YAW RATE SEN”, “SIDE G-SENSOR” in “DATA MONITOR” and check Yaw rate/side G sensor
signal.
OK or NG
OK >>
Replace ABS actuator and electric unit (control unit).

Perform the self-diagnosis, and make sure that the result shows “NO DTC IS DETECTED”.
NG >>

Replace Yaw rate/side G sensor.

Perform the self-diagnosis, and make sure that the result shows “NO DTC IS DETECTED”.
SFIA3045E
ABS actuator and electric unit (control unit) Yaw rate/side G sensor Continuity
18 1
Ye s 37 2
16 4
20 5
15 6
Vehicle condition YAW RATE SEN (DATA MONITOR) SIDE G-SENSOR (DATA MONITOR)
Stopped Approx. 0 d/s
Approx. 0 m/s
2
Turning right Negative value Negative value
Turning left Positive value Positive value

BRC-46
[VDC/TCS/ABS]
TROUBLE DIAGNOSIS FOR SYSTEM
Revision: 2007 April2007 M35/M45
Brake Fluid Level Switch CircuitNFS000QW
CAUTION:
Check brake fluid level in brake reservoir tank before starting inspection.
INSPECTION PROCEDURE
1. CHECK SELF-DIAGNOSIS RESULTS
1. Check brake fluid level in brake reservoir tank. If brake fluid level is low, refill brake fluid.
2. Check self-diagnosis results.
Is above displayed on the self-diagnosis display?
YES >> GO TO 2.
NO >> INSPECTION END
2. CHECK CONNECTOR
1. Turn ignition switch OFF and disconnect brake fluid level switch connector E23 and ABS actuator and
electric unit (control unit) connector E30, check terminal for deformation, disconnection, looseness, and
so on. If any malfunction is found, repair or replace terminal.
2. Reconnect connector and perform self-diagnosis.
OK or NG
OK >> INSPECTION END
NG >> GO TO 3.
3. CHECK BRAKE FLUID LEVEL SWITCH
1. Turn ignition switch OFF and disconnect brake fluid level switch
connector E23.
2. Check continuity between brake fluid level switch connector E23
terminal 1 and 2.
OK or NG
OK >> GO TO 4.
NG >>

Brake fluid level switch is malfunctioning. Replace reservoir tank. Refer to BR-14, "BRAKE
MASTER CYLINDER" .

Perform the self-diagnosis, and make sure that the result shows “NO DTC IS DETECTED”.
Self-diagnosis results
BR FLUID LEVEL LOW
Brake fluid level switch Condition Continuity
1, 2When brake fluid is full in the reservoir tank No
When brake fluid is empty in the reservoir
tankYe s
SFIA2966E

TROUBLE DIAGNOSIS FOR SYSTEM
BRC-47
[VDC/TCS/ABS]
C
D
E
G
H
I
J
K
L
MA
B
BRC
Revision: 2007 April2007 M35/M45
4. CHECK BRAKE FLUID LEVEL SWITCH HARNESS
1. Disconnect ABS actuator and electric unit (control unit) connec-
tor E30.
2. Check continuity between brake fluid level switch harness con-
nector E23 and ABS actuator and electric unit (control unit) har-
ness connector E30.
OK or NG
OK >> Connect connector securely and perform self-diagnosis.
NG >>

Repair or replace malfunctioning components.

Perform the self-diagnosis, and make sure that the
result shows “NO DTC IS DETECTED”.
RAS Control Unit Circuit (With RAS)NFS000QX
INSPECTION PROCEDURE
1. CHECK SELF-DIAGNOSIS RESULTS
Check self-diagnosis results.
Is above displayed on the self-diagnosis display?
YES >> GO TO 2.
NO >> INSPECTION END
2. CHECK RAS CONTROL UNIT CIRCUIT
1. Perform RAS control unit self-diagnosis. Repair or replace items indicated, then perform RAS control unit
self-diagnosis again. Refer to STC-31, "
SELF-DIAGNOSIS PROCEDURE" .
2. Perform ABS actuator and electric unit (control unit) self-diagnosis.
OK or NG
OK >> INSPECTION END
NG >>

Repair or replace malfunctioning components.

Perform the self-diagnosis, and make sure that the result shows “NO DTC IS DETECTED”.
ABS actuator and electric unit (control unit) Brake fluid level switch Continuity
431Yes
Ground No
Ground 2 Yes
SFIA3046E
Self-diagnosis results
RAS CIRCUIT

BRC-48
[VDC/TCS/ABS]
TROUBLE DIAGNOSIS FOR SYSTEM
Revision: 2007 April2007 M35/M45
ICC Sensor Integrated Unit Circuit (With ICC)NFS000QY
INSPECTION PROCEDURE
1. CHECK SELF-DIAGNOSIS RESULTS
Check self-diagnosis results.
Is above displayed on the self-diagnosis display?
YES >> GO TO 2.
NO >> INSPECTION END
2. CHECK ICC SENSOR INTEGRATED UNIT CIRCUIT
1. Perform ICC sensor integrated unit self-diagnosis. Repair or replace items indicated, then perform ICC
sensor integrated unit self-diagnosis again. Refer to ACS-29, "
TROUBLE DIAGNOSIS - GENERAL
DESCRIPTION" .
2. Perform ABS actuator and electric unit (control unit) self-diagnosis.
OK or NG
OK >> INSPECTION END
NG >>

Repair or replace malfunctioning components.

Perform the self-diagnosis, and make sure that the result shows “NO DTC IS DETECTED”.
CAN Communication CircuitNFS000R0
INSPECTION PROCEDURE
1. CHECK CONNECTOR
1. Turn ignition switch OFF and disconnect ABS actuator and electric unit (control unit) connector E30,
check terminal for deformation, disconnection, looseness, and so on. If any malfunction is found, repair or
replace terminal.
2. Reconnect connector and perform self-diagnosis.
Note: Indicated only for vehicles with ICC.
Is above displayed on the self-diagnosis display?
YES >> Print out self-diagnosis results and go to Refer to LAN-50, "CAN System Specification Chart" .
NO >> INSPECTION END
Self-diagnosis results
ACC CONT
Self-diagnosis results
CAN COMM CIRCUIT
ST ANG SEN COM CIR
ACC COMM CIRCUIT (Note)

TROUBLE DIAGNOSIS FOR SYSTEM
BRC-49
[VDC/TCS/ABS]
C
D
E
G
H
I
J
K
L
MA
B
BRC
Revision: 2007 April2007 M35/M45
VDC OFF Switch CircuitNFS000R1
INSPECTION PROCEDURE
1. CHECK VDC OFF SWITCH
1. Turn ignition switch OFF and disconnect VDC OFF switch con-
nector M24.
2. Check continuity between VDC OFF switch connector M24 ter-
minal 1 and 2.
OK or NG
OK >> GO TO 2.
NG >> VDC OFF switch is malfunctioning. Replace VDC OFF
switch.
2. CHECK VDC OFF SWITCH HARNESS
1. Disconnect ABS actuator and electric unit (control unit) connec-
tor E30.
2. Check continuity between VDC OFF switch connector M24 and
ABS actuator and electric unit (control unit) connector E30.
OK or NG
OK >> INSPECTION END
NG >> Repair or replace malfunctioning components.
VDC OFF switch Condition Continuity
1, 2VDC OFF switch ON Yes
VDC OFF switch OFF No
SFIA2409E
ABS actuator and electric unit (control unit) VDC OFF switch Continuity
311Yes
Ground No
Ground 2 Yes
SFIA3047E