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. Information necessary to service the system safely is included in the SRS and SB section of this Service Manual.
| 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 SRS section. Do not use electrical test equipment on any circuit related to the SRS unless instructed to in this Service Manual. SRS wiring harnesses can be identified by yellow and/or orange harness connectors. |
Precautions for Battery Service
This vehicle is equipped with the automatic window adjusting function. When a door is opened, the window automatically lowers slightly to avoid contact between the window and the side roof panel. After the door is closed, the window will automatically raise slightly.
On vehicle equipped with the automatic window adjusting function, lower both the driver and front passenger side windows before disconnecting the battery cables. This will prevent interference between the side window and the roof panel when either door is opened/closed.
| CAUTION | After the battery cables are disconnected, do not open/close the driver and/or front passenger door with the window in the full up position. The automatic window adjusting function will not work and the side roof panel may be damaged. |
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 A/C auto amplifier, and sends signals to ECM using CAN communication.
Scheme 34
Scheme 35
Scheme 36
Scheme 37
- Description BCM reads combination switch (light, wiper washer, turn signal) status, and controls various electrical components according to the results. BCM reads information of 20 switches and 5 diagnostic results by combining five output terminals (OUTPUT 1-5) and five input terminals (INPUT 1-5).
- Operation description BCM outputs battery voltage from input terminals (INPUT 1-5) all the time. At the same time output terminals (OUTPUT 1-5) active transistors in turn, and allow current to flow. At this time, if any (1 or more) of the switches are ON, the input terminals corresponding to these switches detect current flow, and the interface of BCM detects the condition. Then BCM judges switches are ON.
- BCM-Operation table of combination switches. BCM reads operation status of combination switches by the combination shown in the figure. (Scheme 35) NOTE: Dual switches are set for head lamps.
- Example (When lighting switch 1st position is turned ON) When lighting switch 1st position is turned ON, contact in combination switch turns ON. At this time if OUTPUT 5 transistor is activated, BCM detects current flow in INPUT 4. When OUTPUT 5 transistor is ON, BCM detects current flow in INPUT 4, and judges lighting switch 1st position is ON. Then BCM sends tail lamp ON signal to IPDM E/R using CAN communication. When OUTPUT 5 transistor is activated again, BCM detects current flow in INPUT 4, and confirms lighting switch 1st position is continuously ON. NOTE: Each OUTPUT terminal transistor is activated at 10 ms intervals. Therefore, after a switch is turned ON, the 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 shown below. Normal mode When BCM is not in sleep mode, each OUTPUT (1 - 5) terminal turns or ON-OFF at 10 ms intervals.
- Sleep mode When BCM is in sleep mode, transistors of OUTPUT 1 and 2 stop the output, and BCM enters low-current-consumption mode. OUTPUTS (3 - 5) ON-OFF at 60 ms intervals, and receive lighting switch input only.
CAN COMMUNICATION CONTROL
CAN communication is capable of dealing with a lot of information through the two communication lines (CAN L-line, CAN H-line) connecting control units in the system. Also each control unit functions to transmit and receive data, reads necessary information 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 status This is the status to stop 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 with another control unit stops, it switches to CAN communication 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. Two seconds after CAN communication with another control unit stops, it switches to CAN communication 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 control performed only by BCM is required by switch, it shifts to CAN communication inactive mode. It changes combination switch reading function.
SYSTEMS CONTROLLED BY BCM DIRECTLY
- Power door lock system. Refer to «POWER DOOR LOCK SYSTEM»(ref-184454) .
- Remote keyless entry system. Refer to «REMOTE KEYLESS ENTRY SYSTEM»(ref-184455) .
- Power window system. Refer to POWER WINDOW SYSTEM .
- Room lamp timer. Refer to INTERIOR ROOM LAMP .
- Warning chime. Refer to «WARNING CHIME»(ref-184474) .
- Turn signal and hazard warning lamps. Refer to TURN SIGNAL AND HAZARD WARNING LAMPS . NOTE: Power supply only. No system control.
SYSTEMS CONTROLLED BY BCM AND IPDM E/R
- Panic alarm. Refer to «REMOTE KEYLESS ENTRY SYSTEM»(ref-184455) .
- Theft warning system. Refer to «VEHICLE SECURITY (THEFT WARNING) SYSTEM»(ref-184461) .
- IVIS (NATS). Refer to "NVIS (NISSAN VEHICLE IMMOBILIZER SYSTEM-NATS) ".
- Headlamp, tail lamp, auto light system. Battery saver control.
- Wiper. Refer to FRONT WIPER AND WASHER SYSTEM .
- Front washer. Refer to FRONT WIPER AND WASHER SYSTEM .
- Rear window defogger. Refer to REAR WINDOW DEFOGGER .
Scheme 38
CONSULT-II
CONSULT-II can display each diagnostic item using the following diagnostic test modes: work support, self-diagnostic results, data monitor and active test through data reception and command transmission via the BCM communication line.
