Infiniti FX35, FX50 (S51). Manual — part 1722
B1051, B1056 DRIVER AIRBAG MODULE
SRC-53
< DTC/CIRCUIT DIAGNOSIS >
C
D
E
F
G
I
J
K
L
M
A
B
SRC
N
O
P
B1051, B1056 DRIVER AIRBAG MODULE
Description
INFOID:0000000005241106
For driver air bag module, crash is judged by main “G” sensor output signal and safing algorithm in front direc-
tion.
OPERATION
In case of frontal collision whose acceleration exceeds the specified level, the ignition materials are ignited by
electric ignition system. The system burns the gas generating materials resulting in a chemical reaction. This
generates hot gases that flow into the air bag through a filter and expand the bag.
STRUCTURE
Driver air bag module mainly consists of air bag and inflator that inflates air bag.
INSTALLATION
Driver air bag module is installed on the center of steering wheel with fixed bolts.
DTC Logic
INFOID:0000000005241107
DTC CONFIRMATION PROCEDURE
1.
CHECK SELF-DIAG RESULT
With CONSULT-III
1.
Turn ignition switch ON.
2.
Perform “AIR BAG” Self Diagnostic Result.
Without CONSULT-III
1.
Turn ignition switch ON.
2.
Check the air bag warning lamp status. Refer to
SRC-16, "Air Bag Warning Lamp Diagnosis"
.
NOTE:
SRS does not enter diagnosis mode if no malfunction is detected in user mode.
Is malfunctioning part detected?
YES
>> Refer to
NO
>> INSPECTION END
Diagnosis Procedure
INFOID:0000000005241108
WARNING:
• Before servicing, turn ignition switch OFF, disconnect battery negative terminal and wait at least 3
minutes. (To discharge backup capacitor.)
• Never use unspecified tester or other measuring device.
1.
CHECK HARNESS CONNECTOR
Check the harness connector.
Is the inspection result normal?
YES
>> GO TO 2.
NO
>> Replace harness connector.
2.
CHECK WIRING HARNESS
Check the wiring harness externals.
Is the inspection result normal?
YES
>> GO TO 3.
DTC No.
Trouble diagnosis name
DTC detecting condition
Possible cause
B1051
B1056
DRIVER AIRBAG MOD-
ULE
[GND-SHORT]
Driver air bag module circuit is shorted
to ground
(including the spiral cable)
• Disconnection of wiring harness and
short
• Malfunction in driver air bag module
• Malfunction in spiral cable
• Malfunction in air bag diagnosis sen-
sor unit
SRC-54
< DTC/CIRCUIT DIAGNOSIS >
B1051, B1056 DRIVER AIRBAG MODULE
NO
>> Replace wiring harness.
3.
CHECK SPIRAL CABLE CIRCUIT
1.
Turn ignition switch OFF.
2.
Disconnect driver air bag module harness connector and combination switch (spiral cable) harness con-
nector.
3.
Check continuity between driver air bag module harness connector and combination switch (spiral cable)
harness connector.
4.
Check continuity between driver air bag module harness connector and ground.
Is the inspection result normal?
YES
>> GO TO 4.
NO
>> Replace combination switch (spiral cable). Refer to
4.
REPLACE DRIVER AIR BAG MODULE
1.
Replace driver air bag module. Refer to
.
2.
Perform DTC confirmation procedure. Refer to
.
Is DTC detected?
YES
>> GO TO 5.
NO
>> INSPECTION END
5.
REPLACE AIR BAG DIAGNOSIS SENSOR UNIT
1.
Replace air bag diagnosis sensor unit. Refer to
2.
Perform DTC confirmation procedure. Refer to
.
Is DTC detected?
YES
>> GO TO 1.
NO
>> INSPECTION END
Driver air bag module har-
ness connector
Terminal
combination switch (spiral ca-
ble) harness
connector
Terminal
Continuity
M302
10
M35
28
Existed
11
30
M301
12
29
9
30
Driver side air bag module harness con-
nector
Terminal
Ground
Continuity
M302
10
Not existed
11
M301
12
9
B1052, B1057 DRIVER AIRBAG MODULE
SRC-55
< DTC/CIRCUIT DIAGNOSIS >
C
D
E
F
G
I
J
K
L
M
A
B
SRC
N
O
P
B1052, B1057 DRIVER AIRBAG MODULE
Description
INFOID:0000000005241109
For driver air bag module, crash is judged by main “G” sensor output signal and safing algorithm in front direc-
tion.
OPERATION
In case of frontal collision whose acceleration exceeds the specified level, the ignition materials are ignited by
electric ignition system. The system burns the gas generating materials resulting in a chemical reaction. This
generates hot gases that flow into the air bag through a filter and expand the bag.
STRUCTURE
Driver air bag module mainly consists of air bag and inflator that inflates air bag.
INSTALLATION
Driver air bag module is installed on the center of steering wheel with fixed bolts.
DTC Logic
INFOID:0000000005241110
DTC CONFIRMATION PROCEDURE
1.
CHECK SELF-DIAG RESULT
With CONSULT-III
1.
Turn ignition switch ON.
2.
Perform “AIR BAG” Self Diagnostic Result.
Without CONSULT-III
1.
Turn ignition switch ON.
2.
Check the air bag warning lamp status. Refer to
SRC-16, "Air Bag Warning Lamp Diagnosis"
.
NOTE:
SRS does not enter diagnosis mode if no malfunction is detected in user mode.
Is malfunctioning part detected?
YES
>> Refer to
NO
>> INSPECTION END
Diagnosis Procedure
INFOID:0000000005241111
WARNING:
• Before servicing, turn ignition switch OFF, disconnect battery negative terminal and wait at least 3
minutes. (To discharge backup capacitor.)
• Never use unspecified tester or other measuring device.
1.
CHECK HARNESS CONNECTOR
Check the harness connector.
Is the inspection result normal?
YES
>> GO TO 2.
NO
>> Replace harness connector.
2.
CHECK WIRING HARNESS
Check the wiring harness externals.
Is the inspection result normal?
YES
>> GO TO 3.
DTC No.
Trouble diagnosis name
DTC detecting condition
Possible cause
B1052
B1057
DRIVER AIRBAG MOD-
ULE
[SHORT]
Driver air bag module circuit are shorted
to each other
(including the spiral cable)
• Disconnection of wiring harness
and short
• Malfunction in driver air bag module
• Malfunction in spiral cable
• Malfunction in air bag diagnosis sen-
sor unit
SRC-56
< DTC/CIRCUIT DIAGNOSIS >
B1052, B1057 DRIVER AIRBAG MODULE
NO
>> Replace wiring harness.
3.
CHECK SPIRAL CABLE CIRCUIT
1.
Turn ignition switch OFF.
2.
Disconnect driver air bag module harness connector and combination switch (spiral cable) harness con-
nector.
3.
Check continuity between driver air bag module harness connector and combination switch (spiral cable)
harness connector.
4.
Check continuity between driver air bag module harness connector and ground.
Is the inspection result normal?
YES
>> GO TO 4.
NO
>> Replace combination switch (spiral cable). Refer to
4.
REPLACE DRIVER AIR BAG MODULE
1.
Replace driver air bag module. Refer to
.
2.
Perform DTC confirmation procedure. Refer to
.
Is DTC detected?
YES
>> GO TO 5.
NO
>> INSPECTION END
5.
REPLACE AIR BAG DIAGNOSIS SENSOR UNIT
1.
Replace air bag diagnosis sensor unit. Refer to
2.
Perform DTC confirmation procedure. Refer to
.
Is DTC detected?
YES
>> GO TO 1.
NO
>> INSPECTION END
Driver air bag module har-
ness connector
Terminal
combination switch (spiral ca-
ble) harness
connector
Terminal
Continuity
M302
10
M35
28
Existed
11
30
M301
12
29
9
30
Driver side air bag module harness con-
nector
Terminal
Ground
Continuity
M302
10
Not existed
11
M301
12
9
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