Precautions for Supplemental Restraint System (SRS) "AIR BAG" and "SEAT BELT PRE-TENSIONER"
The Supplemental Restraint System such as "AIR BAG" and "SEAT BELT PRE-TENSIONER", used along with a front seat belt, helps to reduce the risk or severity of injury to the driver and front passenger for certain types of collision. This system includes seat belt switch inputs and dual stage front air bag modules. The SRS system uses the seat belt switches to determine the front air bag deployment, and may only deploy one front air bag, depending on the severity of a collision and whether the front occupants are belted or unbelted. Information necessary to service the system safely is included in the SUPPLEMENTAL RESTRAINT SYSTEM and SEAT BELTS articles.
| WARNING | To avoid rendering the SRS inoperative, which could increase the risk of personal injury or death in the event of a collision which would result in air bag inflation, all maintenance must be performed by an authorized NISSAN/INFINITI dealer. Improper maintenance, including incorrect removal and installation of the SRS, can lead to personal injury caused by unintentional activation of the system. For removal of Spiral Cable and Air Bag Module, see the SUPPLEMENTAL RESTRAINT SYSTEM article . Do not use electrical test equipment on any circuit related to the SRS unless instructed to in this information. SRS wiring harnesses can be identified by yellow and/or orange harnesses or harness connectors. |
BCM FUNCTION
BCM has a combination switch reading function for reading the operation of combination switches (light, wiper washer, turn signal) in addition to the function for controlling the operation of various electrical components. Also, it functions as an interface that receives signals from the front air control, and sends signals to ECM using CAN communication.
Scheme 56
Scheme 57
Scheme 58
Scheme 59
- Description BCM reads combination switch (light, wiper) status, and controls various electrical components according to the results. BCM reads information of a maximum of 20 switches by combining five output terminals (OUTPUT 1-5) and five input terminals (INPUT 1-5).
- Operation description BCM activates transistors of output terminals (OUTPUT 1-5) periodically and allows current to flow in turn. If any (1 or more) of the switches are turned ON, circuit of output terminals (OUTPUT 1-5) and input terminals (INPUT 1-5) becomes active. At this time, transistors of output terminals (OUTPUT 1-5) are activated to allow current to flow. When voltage of input terminals (INPUT 1-5) corresponding to that switch changes, interface in BCM detects voltage change and BCM determines that switch is ON. (Scheme 56): Combination Switch Reading Function Description - Circuit Diagram
- BCM-Operation table of combination switch BCM reads operation status of combination switch by the combination shown in the following table. (Scheme 57): BCM Operation Reference Table NOTE: Headlamp has a dual system switch.
- Example operation: (When lighting switch 1st position turned ON) When lighting switch 1st position is turned ON, contact in combination switch turns ON. At this time if OUTPUT 4 transistor is activated, BCM detects that voltage changes in INPUT 5. When OUTPUT 4 transistor is ON, BCM detects that voltage changes in INPUT 5, and judges lighting switch 1st position is ON. Then BCM sends tail lamp ON signal to IPDM E/R using CAN communication. When OUTPUT 4 transistor is activated again, BCM detects that voltage changes in INPUT 5 and recognizes that lighting switch 1st position is continuously ON. (Scheme 58): BCM - Circuit Diagram NOTE: Each OUTPUT terminal transistor is activated at 10ms intervals. Therefore, after a switch is turned ON, electrical loads are activated with a time delay. But this time delay is so short that it cannot be noticed.
- Operation mode Combination switch reading function has operation modes as follows: Normal status When BCM is not in sleep status, OUTPUT terminals (1-5) each turn ON-OFF every 10ms. Sleep status When BCM is in sleep mode, transistors of OUTPUT 1 and 5 stop the output, and BCM enters low-current-consumption mode. OUTPUTS (2, 3, and 4) turn ON-OFF at 60ms intervals, and receives lighting switch input only. (Scheme 59): BCM Low-Current-Consumption Mode Blinking Pattern
CAN COMMUNICATION CONTROL
CAN communication allows a high rate of information through the two communication lines (CAN-L, CAN-H) connecting the various control units in the system. Each control unit transmits/receives data, but selectively reads required data only.
BCM STATUS CONTROL
BCM changes its status depending on the operation status in order to save power consumption.
- CAN communication status With ignition switch ON, CAN communicates with other control units normally. Control by BCM is being operated properly. When ignition switch is OFF, switching to sleep mode is possible. Even when ignition switch is OFF, if CAN communication with IPDM E/R and combination meter is active, CAN communication status is active.
- Sleep transient status This status shuts down CAN communication when ignition switch is turned OFF. It transmits sleep request signal to IPDM E/R and combination meter. Two seconds after CAN communication of all control units stops, CAN communication switches to inactive status.
- CAN communication inactive status With ignition switch OFF, CAN communication is not active. With ignition switch OFF, control performed only by BCM is active. Three seconds after CAN communication of all control units stops, CAN communication switches to inactive status.
- Sleep status BCM is activated with low current consumption mode. CAN communication is not active. When CAN communication operation is detected, it switches to CAN communication status. When a state of the following switches changes, it switches to CAN communication state: Ignition switch Key switch Hazard switch Door lock/unlock switch Front door switch LH, RH Rear door switch LH, RH (Crew cab) Rear door switch upper LH, RH (King cab) Rear door switch lower LH, RH (King cab) Combination switch (passing, lighting switch 1st position, front fog lamp) Keyfob (lock/unlock signal) Door lock assembly LH (key cylinder switch) When control performed only by BCM is required by switch, it shifts to CAN communication inactive mode. Status of combination switch reading function is changed.
SYSTEMS CONTROLLED BY BCM DIRECTLY
- Power door lock system. Refer to " «POWER DOOR LOCK SYSTEM»(ref-272351-S19306609192007111800000) ".
- Remote keyless entry system. Refer to " «REMOTE KEYLESS ENTRY SYSTEM»(ref-272351-S01972839112007111800000) ".
- Power window system. Refer to " «POWER WINDOW SYSTEM»(ref-272361-S02691050812007111800000) ". NOTE
- Sunroof system. Refer to " «SUNROOF»(ref-272377-S28450704142007111800000) ". NOTE
- Room lamp timer. Refer to " «INTERIOR ROOM LAMP»(ref-272360-S31964797302007111800000) ".
- Warning chime system. Refer to " «WARNING CHIME»(ref-272357-S40682847002007111800000) ".
- Turn signal and hazard warning lamps system. Refer to " «TURN SIGNAL AND HAZARD WARNING LAMPS»(ref-272360-S31153665462007111800000) ".
Note. Power supply only. No system control.
SYSTEMS CONTROLLED BY BCM AND IPDM E/R
- Panic system. Refer to " «REMOTE KEYLESS ENTRY SYSTEM»(ref-272351-S01972839112007111800000) ".
- NVIS (NATS) system. Refer to " «NVIS(NISSAN VEHICLE IMMOBILIZER SYSTEM-NATS)»(ref-272351-S09097644822007111800000) ".
- Headlamp, tail lamp, auto light (with auto light system) and battery saver control systems. Refer to " «HEADLAMP (FOR USA)»(ref-272360-S05680777872007111800000) " or " «HEADLAMP (FOR CANADA) - DAYTIME LIGHT SYSTEM»(ref-272360-S18610583782007111800000) ".
- Front wiper and washer system. Refer to " «FRONT WIPER AND WASHER SYSTEM»(ref-272376-S36617166922007111800000) ".
- Rear window defogger system (Crew cab). Refer to " «REAR WINDOW DEFOGGER»(ref-272361-S23653276032007111800000) ".
MAJOR COMPONENTS AND CONTROL SYSTEM
| System | Input | Output |
|---|---|---|
| Remote keyless entry system | Keyfob | All door locking actuator Turn signal lamp (LH, RH) |
| Power door lock system | Front power door lock/unlock switch (LH, RH) | All door locking actuator |
| Power supply (IGN) to power window and sunroof | Ignition power supply | Power supply to power window and sunroof system |
| Power supply (BAT) to power window and sunroof | Battery power supply | Power supply to power window and sunroof system |
| Panic alarm | Key switch Keyfob | IPDM E/R |
| Auto light system (with auto light system) | Optical sensor Combination switch | IPDM E/R |
| Battery saver control | Ignition switch Combination switch | IPDM E/R |
| Headlamp | Combination switch | IPDM E/R |
| Tail lamp | Combination switch | IPDM E/R |
| Fog lamp (with front fog lamps) | Combination switch | IPDM E/R |
| Turn signal lamp | Combination switch | Turn signal lamp Combination meter |
| Hazard lamp | Hazard switch | Turn signal lamp Combination meter |
| Room lamp timer | Key switch Keyfob Main power window and door lock/unlock switch Front door switch LH All door switch | Interior room lamp |
| Key warning chime | Key switch Front door switch LH | Combination meter (warning buzzer) |
| Light warning chime | Combination switch Key switch Front door switch LH | Combination meter (warning buzzer) |
| Variable speed intermittent wiper | Combination switch Combination meter | IPDM E/R |
| Rear window defogger (crew cab) | Rear window defogger switch | IPDM E/R |
| Air conditioner switch signal (with A/C) | Front air control | ECM |
| Blower fan switch signal | Front air control | ECM |
SYSTEM REFERENCE
Terminals and Reference Values for BCM
TERMINALS REFERENCE Terminal Wire color Item Signal input/output Measuring condition Reference value or waveform (Approx.) Ignition switch Operation or condition 1 BR Ignition keyhole illumination Output OFF Door is locked (SW OFF) Battery voltage Door is unlocked (SW ON) 0V 2 P Combination switch input 5 Input ON Lighting, turn, wiper OFF Wiper dial position 4 3 SB Combination switch input 4 Input ON Lighting, turn, wiper OFF Wiper dial position 4 4 V Combination switch input 3 Input ON Lighting, turn, wiper OFF Wiper dial position 4 5 L Combination switch input 2 Input ON Lighting, turn, wiper OFF Wiper dial position 4 6 R Combination switch input 1 7 GR Front door lock assembly LH (key cylinder switch) unlock Input OFF ON (open, 2nd turn) Momentary 1.5V OFF (closed) 0V 8 SB Front door lock assembly LH (key cylinder switch) lock Input On (open) Momentary 1.5V OFF (closed) 0V 9 Y Rear window defogger switch Input ON Rear window defogger switch ON 0V Rear window defogger switch OFF 5V 11 G/B Ignition switch (ACC or ON) Input ACC or ON Ignition switch ACC or ON Battery voltage 12 LG Front door switch RH (All) Input OFF ON (open) 0V Rear door switch upper RH (King Cab) OFF (closed) Battery voltage Rear door switch lower RH (King Cab) 13 L Rear door switch RH (Crew Cab) Input OFF ON (open) 0V OFF (closed) Battery voltage 15 W Tire pressure warning check connector Input OFF - 5V 18 BR Remote keyless entry receiver (Ground) Output OFF - 0V 19 V Remote keyless entry receiver (power supply) Output OFF Ignition switch OFF 20 G Remote keyless entry receiver signal (Signal) Input OFF Stand-by (keyfob buttons released) When remote keyless entry receiver receives signal from keyfob (keyfob buttons pressed) 21 GR NATS antenna amp. Input OFF --> ON Ignition switch (OFF --> ON) Just after turning ignition switch ON: Pointer of tester should move. 23 G Security indicator lamp Output OFF Goes OFF --> illuminates (Every 2.4 seconds) Battery voltage --> 0V 25 BR NATS antenna amp. Input OFF --> ON Ignition switch (OFF --> ON) Just after turning ignition switch ON: Pointer of tester should move. 27 W Compressor ON signal Input ON A/C switch OFF 5V A/C switch ON 0V 28 R Front blower monitor Input ON Front blower motor OFF Battery voltage Front blower motor ON 0V 29 G Hazard switch Input OFF ON 0V OFF 5V 31 GR Cargo lamp switch Input OFF ON 0V OFF Battery voltage 32 O Combination switch output 5 Output ON Lighting, turn, wiper OFF Wiper dial position 4 33 GR Combination switch output 4 Output ON Lighting, turn, wiper OFF Wiper dial position 4 34 G Combination switch output 3 Output ON Lighting, turn, wiper OFF Wiper dial position 4 35 BR Combination switch output 2 Output ON Lighting, turn, wiper OFF Wiper dial position 4 36 LG Combination switch output 1 37 B Key switch Input OFF Key inserted Battery voltage Key removed 0V 38 W/R Ignition switch (ON) Input ON - Battery voltage 39 L CAN-H - - - - 40 P CAN-L - - - - 45 V Lock switch Input OFF ON (lock) 0V OFF Battery voltage 46 LG Unlock switch Input OFF ON (unlock) 0V OFF Battery voltage 47 GR Front door switch LH (All) Input OFF ON (open) 0V Rear door switch upper LH (King Cab) OFF (closed) Battery voltage Rear door switch lower LH (King Cab) 48 P Rear door switch LH (Crew Cab) Input OFF ON (open) 0V OFF (closed) Battery voltage 50 P Cargo lamp Output OFF Any door open (ON) 0V All doors closed (OFF) Battery voltage 51 G Trailer turn signal (right) Output ON Turn right ON 52 V Trailer turn signal (left) Output ON Turn left ON 56 V Battery saver output Output OFF 30 minutes after ignition switch is turned OFF 0V ON - Battery voltage 57 R/Y Battery power supply Input - - Battery voltage 58 W Optical sensor Input ON When optical sensor is illuminated 3.1V or more When optical sensor is not illuminated 0.6V or less 59 GR Front door lock assembly LH (unlock) Output OFF OFF (neutral) 0V ON (unlock) Battery voltage 60 LG Turn signal (left) Output ON Turn left ON 61 G Turn signal (right) Output ON Turn right ON 63 BR Interior room/map lamp Output OFF Any door switch ON (open) 0V OFF (closed) Battery voltage 65 V All door lock actuators (lock) Output OFF OFF (neutral) 0V ON (lock) Battery voltage 66 L Front door lock actuator RH, rear door lock actuators LH/RH (unlock) Output OFF OFF (neutral) 0V ON (unlock) Battery voltage 67 B Ground Input ON - 0V 68 O Power window power supply (RAP) Output - Ignition switch ON Battery voltage Within 45 seconds after ignition switch OFF Battery voltage More than 45 seconds after ignition switch OFF 0V When front door LH or RH is open or power window timer operates 0V 70 P Power window power supply (BAT) Output OFF - Battery voltage 70 W Battery power supply Input OFF - Battery voltage
Scheme 60
Scheme 61
Scheme 62
Scheme 63
Scheme 64
Scheme 65
Scheme 66
Scheme 67
- CHECK FUSES AND FUSIBLE LINK Check 50A fusible link (letter g, located in the fuse and fusible link box). Check 10A fuses [No. 1, 4 and 18, located in the fuse block (J/B)]. OK or NG OK: GO TO 2. NG: If fuse is blown, be sure to eliminate cause of malfunction before installing new fuse. Refer to " «PRECAUTIONS»(ref-272334-S38528264632007111800000) ".
- CHECK BCM POWER SUPPLY CIRCUIT Turn ignition switch OFF. Disconnect BCM. Check voltage between BCM connectors and ground. (Scheme 60): Checking Voltage Between BCM Connectors And Ground TERMINALS REFERENCE Connector Terminals Power source Condition Voltage (V) (Approx.) (+) (-) M18 11 Ground ACC power supply Ignition switch ACC or ON Battery voltage 38 Ground Ignition power supply Ignition switch ON or START Battery voltage M20 57 Ground Battery power supply Ignition switch OFF Battery voltage 70 Ground Battery power supply Ignition switch OFF Battery voltage OK or NG OK: GO TO 3. NG: Repair or replace the harness.
- CHECK GROUND CIRCUIT Check continuity between BCM connector M20 terminal 67 and ground. 67-Ground: Continuity should exist. OK or NG OK: Power supply and ground circuit is OK. NG: Repair or replace harness. (Scheme 61): Checking Continuity Between BCM Connector M20 Terminal 67 And Ground
CONSULT-II Function (BCM)
CONSULT-II can display each diagnostic item using the diagnostic test modes shown following.
| BCM diagnostic test item | Diagnostic mode | Content |
|---|---|---|
| Inspection by part | WORK SUPPORT | Supports inspections and adjustments. Commands are transmitted to the BCM for setting the status suitable for required operation, input/output signals are received from the BCM and received data is displayed. |
| DATA MONITOR | Displays BCM input/output data in real time. | |
| ACTIVE TEST | Operation of electrical loads can be checked by sending drive signal to them. | |
| SELF-DIAG RESULTS | Displays BCM self-diagnosis results. | |
| CAN DIAG SUPPORT MNTR | The results of transmit/receive diagnosis of CAN communication can be read. | |
| ECU PART NUMBER | BCM part number can be read. | |
| CONFIGURATION | Performs BCM configuration read/write functions. |
DIAGNOSTIC ITEM REFERENCE
CONSULT-II START PROCEDURE
Refer to " CONSULT-II START PROCEDURE ".
ITEMS OF EACH PART
Note. CONSULT-II will only display systems the vehicle possesses.
| System and item | CONSULT-II display | Diagnostic test mode (Inspection by part) | ||||||
|---|---|---|---|---|---|---|---|---|
| WORK SUPPORT | SELF-DIAG RESULTS | CAN DIAG SUPPORT MNTR | DATA MONITOR | ECU PART NUMBER | ACTIVE TEST | CONFIGURATION | ||
| BCM | BCM | X | X | X | X | |||
| Power door lock system | DOOR LOCK | X | X | X | ||||
| Rear defogger | REAR DEFOGGER | X | X | |||||
| Warning chime | BUZZER | X | X | |||||
| Room lamp timer | INT LAMP | X | X | X | ||||
| Remote keyless entry system | MULTI REMOTE ENT | X | X | X | ||||
| Headlamp | HEAD LAMP | X | X | X | ||||
| Wiper | WIPER | X | X | |||||
| Turn signal lamp Hazard lamp | FLASHER | X | X | |||||
| Blower fan switch signal Air conditioner switch signal | AIR CONDITIONER | X | ||||||
| Combination switch | COMB SW | X | ||||||
| NVIS (NATS) | IMMU | X | X | |||||
| Interior lamp battery saver | BATTERY SAVER | X | X | X | ||||
| Back door | TRUNK | X | X | |||||
| Theft alarm | THEFT ALARM | X | X | X | ||||
| Retained power control | RETAINED PWR | X | X | X | ||||
| Oil pressure switch | SIGNAL BUFFER | X | X | |||||
| Air pressure monitor | AIR PRESSURE MONITOR | X | X | |||||
| Panic alarm | PANIC ALARM | X | X | X | ||||
CONSULT-11 DISPLAY SYSTEMS
Display Item List
| Item | Description |
|---|---|
| RESET SETTING VALUE | Return a value set with WORK SUPPORT of each system to a default value in factory shipment. |
DISPLAY ITEM LIST
READ CONFIGURATION PROCEDURE
| CAUTION | If CONSULT-II is used with no connection of CONSULT-II CONVERTER, malfunctions might be detected in self-diagnosis depending on control unit which carries out CAN communication. |
Scheme 68
Scheme 69
Scheme 70
Scheme 71
Scheme 72
Scheme 73
Scheme 74
Scheme 75
Scheme 76
- With ignition switch OFF, connect CONSULT-II and CONSULT-II CONVERTER to data link connector and turn ignition switch ON. (Scheme 62): Connecting CONSULT-II To Data Link Connector
- Touch "START (NISSAN BASED VHCL)". (Scheme 63): CONSULT-II Screen Display - START
- Touch "BCM" on "SELECT ITEM" screen. If "BCM" is not indicated, refer to " «CONSULT-II DATA LINK CONNECTOR (DLC) CIRCUIT»(ref-272334-S22095494252007111800000) ". (Scheme 64): CONSULT-II Screen Display - SELECT SYSTEM
- Touch "BCM" on "SELECT TEST ITEM" screen. (Scheme 65): CONSULT-II Screen Display - SELECT TEST ITEM
- Touch "CONFIGURATION" on "SELECT DIAG MODE" screen. (Scheme 66): CONSULT-II Screen Display - SELECT DIAG MODE
- Touch "R51/D40/N51" and "OK" on "VEHICLE SELECT" screen. For canceling, touch "CANCEL" on "VEHICLE SELECT" screen. NOTE: Confirm vehicle model on IDENTIFICATION PLATE. Refer to " «MODEL VARIATION»(ref-272334-S25096545212007111800000) ". (Scheme 67): CONSULT-II Screen Display - VEHICLE SELECT
- Touch "READ CONFIGURATION" on "SELECT CONFIG ITEM" screen. (Scheme 68): CONSULT-II Screen Display - SELECT CONFIG ITEM
- Configuration of current BCM is printed out automatically. A listing of manual setting items and auto setting items will be displayed. Auto setting items are preset and cannot be changed. Manual setting items can be set by using WRITE CONFIGURATION PROCEDURE. Refer to " «WRITE CONFIGURATION PROCEDURE»(ref-272372-S21197119952007111800000) ". (Scheme 69): CONSULT-II Display - READ CONFIGURATION
- Touch "BACK" on "READ CONFIGURATION" screen. (Scheme 70): CONSULT-II Display - BACK On READ CONFIGURATION
WRITE CONFIGURATION PROCEDURE
| CAUTION | If CONSULT-II is used with no connection of CONSULT-II CONVERTER, malfunctions might be detected in self-diagnosis depending on control unit which carries out CAN communication. |
Scheme 77
Scheme 78
Scheme 79
Scheme 80
Scheme 81
Scheme 82
- With ignition switch OFF, connect CONSULT-II and CONSULT-II CONVERTER to data link connector and turn ignition switch ON. (Scheme 71): Connecting CONSULT-II To Data Link Connector
- Touch "START (NISSAN BASED VHCL)". (Scheme 72): CONSULT-II Screen Display - START
- Touch "BCM" on "SELECT SYSTEM" screen. If "BCM" is not indicated, refer to " «CONSULT-II DATA LINK CONNECTOR (DLC) CIRCUIT»(ref-272334-S22095494252007111800000) ". (Scheme 73): CONSULT-II Screen Display - SELECT SYSTEM
- Touch "BCM" on "SELECT TEST ITEM" screen. (Scheme 74): CONSULT-II Screen Display - SELECT TEST ITEM
- Touch "CONFIGURATION" on "SELECT DIAG MODE" screen. (Scheme 75): CONSULT-II Screen Display - SELECT DIAG MODE
- Touch "R51/D40/N51" and "OK" on "VEHICLE SELECT" screen. For canceling, touch "CANCEL" on "VEHICLE SELECT" screen. NOTE: Confirm vehicle model on IDENTIFICATION PLATE. Refer to " «MODEL VARIATION»(ref-272334-S25096545212007111800000) ". (Scheme 76): CONSULT-II Screen Display - VEHICLE SELECT
- Touch "WRITE CONFIGURATION" on "SELECT CONFIG ITEM" screen. see scheme 25: CONSULT-II Screen Display - SELECT CONFIG ITEM
- Touch "YES". For canceling, touch "NO". see scheme 26: CONSULT-II Screen Display - CONFIGURATION
- Using the following flow chart, identify the correct model and configuration list. Confirm and/or change setting value for each item according to the configuration list. Depending on CONSULT-II software version being used, some or all of the write configuration items shown in the following configuration lists may be displayed. If an item does not appear on the CONSULT-II "WRITE CONFIGURATION" screen(s), then it is an auto setting item and it cannot be manually set or changed. NOTE: Confirm vehicle model on IDENTIFICATION PLATE. Refer to " «MODEL VARIATION»(ref-272334-S25096545212007111800000) ". REFERENCE CHART ITEM SET VAL AUTO LIGHT WITH <=> WITHOUT DTRL WITH <=> WITHOUT SPEED SNS WIP WITH <=> WITHOUT THEFT ALARM WITH <=> WITHOUT
- Touch "CHNG SETTING" on "WRITE CONFIGURATION" screen. CAUTION: Make sure to touch "CHNG SETTING" even if the indicated configuration of brand-new BCM is same as the desirable configuration. If not, configuration which is set automatically by selecting vehicle model cannot be memorized.
- Touch "OK" on "WRITE CONFIGURATION" screen. If "CANCEL" is touched, it will return to previous screen. see scheme 27: CONSULT-II Screen Display - WRITE CONFIGURATION
- Wait until the next screen during setting. (Scheme 77): CONSULT-II Screen Display - WRITE CONFIGURATION
- WRITE CONFIGURATION results are printed out automatically. Confirm "WRITE CONFIGURATION" is correctly executed by comparing sheet automatically printed out with applicable configuration list shown in Step 9. see scheme 29: CONSULT-II Display - WRITE CONFIGURATION
- Touch "OK" on "WRITE CONFIGURATION" screen. WRITE CONFIGURATION is completed. see scheme 30: CONSULT-II Display - WRITE CONFIGURATION