Nissan Sentra. Manual — part 802
U1000 CAN COMM CIRCUIT
SRC-43
< DTC/CIRCUIT DIAGNOSIS >
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DTC/CIRCUIT DIAGNOSIS
U1000 CAN COMM CIRCUIT
Description
INFOID:0000000009757949
CAN (Controller Area Network) is a serial communication system for real time application. It is an on-vehicle
multiplex communication system with high data communication speed and excellent error detection ability.
Many electronic control units are equipped into vehicles, and each control unit shares information and links
with other control units during operation. With CAN communication, control units are connected with two com-
munication lines (CAN-H line, CAN-L line) allowing a high rate of information transmission with less wiring.
Each control unit transmits and receives data but selectively reads required data only. Refer to
COMMUNICATION SYSTEM : CAN Communication Signal Chart"
.
DTC Logic
INFOID:0000000009757950
DTC DETECTION LOGIC
DTC CONFIRMATION PROCEDURE
1.
PERFORM SELF-DIAGNOSIS
1. Turn ignition switch ON and wait for 7 seconds or more.
2. Using CONSULT, perform SELF-DIAGNOSIS RESULTS of AIR BAG.
3. Check if any DTC is displayed in the self-diagnosis results.
Is DTC detected?
YES
>> Refer to
NO
>> Refer to
GI-39, "Intermittent Incident"
.
Diagnosis Procedure
INFOID:0000000009757951
1.
CHECK CAN COMMUNICATION SYSTEM
Check CAN communication system. Refer to
LAN-16, "Trouble Diagnosis Flow Chart"
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>> Inspection End.
CONSULT name
DTC
DTC detecting condition
Repair order
CAN COMMUNICATION FAILURE
U1000
When air bag diagnosis sensor unit is not
transmitting or receiving CAN communi-
cation signals for 2 or more seconds.
Refer to
.
SRC-44
< DTC/CIRCUIT DIAGNOSIS >
U1010 CONTROL UNIT (CAN)
U1010 CONTROL UNIT (CAN)
Description
INFOID:0000000009757952
Air bag diagnosis sensor performs self-tests on key ON. If CAN communication failure within control unit is
detected, DTC is set.
DTC Logic
INFOID:0000000009757953
DTC DETECTION LOGIC
DTC CONFIRMATION PROCEDURE
1.
PERFORM SELF-DIAGNOSIS
1. Turn ignition switch ON.
2. Using CONSULT, perform SELF DIAGNOSIS RESULTS of AIR BAG.
3. Check if DTC is displayed in the self-diagnosis results.
Is DTC detected?
YES
>> Refer to
NO
>> Inspection End.
Diagnosis Procedure
INFOID:0000000009757954
1.
REPLACE AIR BAG DIAGNOSIS SENSOR UNIT
Replace air bag diagnosis sensor unit. Refer to
SR-28, "Removal and Installation"
.
>> Inspection End.
CONSULT name
DTC
DTC detecting condition
Repair order
CAN CONTROL UNIT FAILURE
U1010
CAN communication error is detected in
control unit.
.
B0001, B0002 DRIVER AIRBAG MODULE
SRC-45
< DTC/CIRCUIT DIAGNOSIS >
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B0001, B0002 DRIVER AIRBAG MODULE
Description
INFOID:0000000009757955
DTC B0001, B0002 DRIVER AIRBAG MODULE
The driver air bag module is dual stage and is wired to the air bag diagnosis sensor unit through the spiral
cable. The air bag diagnosis sensor unit will monitor for opens and shorts in detected lines to the driver air bag
module including the spiral cable.
PART LOCATION
SRC-5, "Component Parts Location"
.
DTC Logic
INFOID:0000000009757956
DTC DETECTION LOGIC
With CONSULT
DTC CONFIRMATION PROCEDURE (With CONSULT)
1.
CHECK SELF-DIAG RESULT
1. Turn ignition switch ON.
2. Check for DTC using CONSULT.
Is the DTC detected?
YES (Current DTC)>>Refer to
YES (Past DTC)>>GO TO 2.
NO
>> Inspection End.
2.
ERASE SELF-DIAG RESULT
Erase the DTC using CONSULT.
CONSULT name
DTC
DTC detecting condition
Repair order
DRIVER AIRBAG MODULE CIRCUIT
[OPEN]
B0001
Driver air bag module circuit
(DR1) is open
(including the spiral cable).
DRIVER AIRBAG MODULE CIRCUIT
[VB-SHORT]
Driver air bag module circuit
(DR1) is shorted to a power sup-
ply circuit
(including the spiral cable).
DRIVER AIRBAG MODULE CIRCUIT
[GND-SHORT]
Driver air bag module circuit
(DR1) is shorted to ground
(including the spiral cable).
DRIVER AIRBAG MODULE CIRCUIT
[SHORT]
Driver air bag module circuits
(DR1) are shorted to each other
(including the spiral cable).
DRIVER AIRBAG MODULE 2ND CIRCUIT
[OPEN]
B0002
Driver air bag module circuit
(DR2) is open
(including the spiral cable).
DRIVER AIRBAG MODULE 2ND CIRCUIT
[VB-SHORT]
Driver air bag module circuit
(DR2) is shorted to a power sup-
ply circuit
(including the spiral cable).
DRIVER AIRBAG MODULE 2ND CIRCUIT
[GND-SHORT]
Driver air bag module circuit
(DR2) is shorted to ground
(including the spiral cable).
DRIVER AIRBAG MODULE 2ND CIRCUIT
[SHORT]
Driver air bag module circuits
(DR2) are shorted to each other
(including the spiral cable).
SRC-46
< DTC/CIRCUIT DIAGNOSIS >
B0001, B0002 DRIVER AIRBAG MODULE
Can the DTC be erased?
YES
>> Inspection End.
NO
>> Refer to
DTC CONFIRMATION PROCEDURE (Without CONSULT)
1.
CHECK SELF-DIAG RESULT
1. Turn ignition switch ON.
2. Check the air bag warning lamp status. Refer to
SRC-17, "Trouble Diagnosis without CONSULT"
NOTE:
SRS will not enter diagnosis mode if no malfunction is detected in user mode.
Is the DTC detected?
YES
>> Refer to
NO
>> Inspection End.
Diagnosis Procedure
INFOID:0000000009757957
1.
HARNESS CONNECTOR
Visually inspect all applicable harness connectors for the following:
• Visible damage to connector or terminal
• Loose terminal
• Poor connection
NOTE:
All harness connectors should be inspected from the air bag diagnosis sensor unit to the end component
(including any in-line connectors).
Is the inspection result normal?
YES
>> GO TO 2.
NO
>> Perform one of the following repairs:
• Visible damage: Replace the harness.
• Loose terminal: Secure the terminal.
• Poor connection: Secure the connection.
2.
CONFIRM DTC
1. Reconnect all harness connectors.
2. Turn ignition switch ON.
3. Check for DTC using CONSULT.
Is DTC still current?
YES
>> GO TO 3.
NO
>> Refer to
GI-39, "Intermittent Incident"
.
3.
WIRING HARNESS
Check the wiring harness for visible damage.
NOTE:
The entire wiring harness should be inspected from the air bag diagnosis sensor unit to the end component
(including any in-line connectors).
Is the inspection result normal?
YES
>> GO TO 4.
NO
>> Replace the harness.
4.
CHECK SPIRAL CABLE CIRCUIT
1. Turn ignition switch OFF.
2. Disconnect driver air bag module harness connectors and spiral cable harness connector.
3. Check continuity between driver air bag module harness connector and spiral cable connector.
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