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 SUPPLEMENTAL RESTRAINT SYSTEM . Do not use electrical test equipment on any circuit related to the SRS unless instructed to . SRS wiring harnesses can be identified by yellow and/or orange harnesses or harness connectors. |
Fusible Link
A melted fusible link can be detected either by visual inspection or by feeling with finger tip. If its condition is questionable, use circuit tester or test lamp.
| CAUTION | If fusible link should melt, it is possible that critical circuit (power supply or large current carrying circuit) is shorted. In such a case, carefully check and eliminate cause of incident. Never wrap outside of fusible link with vinyl tape. Never let fusible link touch any other wiring harness, vinyl or rubber parts. |
Circuit Breaker (Built Into BCM)
For example, when current is 30A, the circuit is broken within 8 to 20 seconds.
A circuit breaker is used for the following systems
Scheme 44
- Power windows
- Power door locks
- Remote keyless entry system
- Power sunroof
SYSTEMS CONTROLLED BY IPDM E/R
- Lamp control Using CAN communication lines, it receives signals from the BCM and controls the following lamps: Headlamps (Hi, Lo) Parking lamps Tail lamps Cornering lamps Front fog lamps
- Wiper control Using CAN communication lines, it receives signals from the BCM and controls the front wipers.
- Rear window defogger relay control Using CAN communication lines, it receives signals from the BCM and controls the rear window defogger relay.
- A/C compressor control Using CAN communication lines, it receives signals from the ECM and controls the A/C compressor (magnetic clutch).
- Cooling fan control Using CAN communication lines, it receives signals from the ECM and controls the cooling fan relays.
- Horn control Using CAN communication lines, it receives signals from the BCM and controls the horn relay.
CAN COMMUNICATION LINE CONTROL
With CAN communication, by connecting each control unit using two communication lines (CAN L-line, CAN H-line), it is possible to transmit a maximum amount of information with minimum wiring. Each control unit can transmit and receive data, and reads necessary information only.
- Fail-safe control When CAN communication with other control units is impossible, IPDM E/R performs fail-safe control. After CAN communication returns to normal operation, it also returns to normal control. Operation of control parts by IPDM E/R during fail-safe mode is as follows: CAN COMMUNICATION LINE CONTROL REFERENCE Controlled system Fail-safe mode Headlamp With the ignition switch ON, the headlamp (low) is ON. With the ignition switch OFF, the headlamp (low) is OFF. Tail and parking lamps With the ignition switch ON, the tail and parking lamps are ON. With the ignition switch OFF, the tail and parking lamps are OFF. Cooling fan With the ignition switch ON, the cooling fan HI operates. With the ignition switch OFF, the cooling fan stops. Front wiper Until the ignition switch is turned off, the front wiper LO and HI remains in the same status it was in just before fail-safe control was initiated. Rear window defogger Rear window defogger relay OFF A/C compressor A/C compressor OFF Front fog lamps Front fog lamp relay OFF
IPDM E/R STATUS CONTROL
In order to save power, IPDM E/R switches status by itself based on each operating condition.
- CAN communication status CAN communication is normally performed with other control units. Individual unit control by IPDM E/R is normally performed. When sleep request signal is received from BCM, mode is switched to sleep waiting status.
- Sleep waiting status Process to stop CAN communication is activated. All systems controlled by IPDM E/R are stopped. When 1 second has elapsed after CAN communication with other control units is stopped, mode switches to sleep status.
- Sleep status IPDM E/R operates in low current-consumption mode. CAN communication is stopped. When a change in CAN communication signal is detected, mode switches to CAN communication status. When a change in ignition switch signal is detected, mode switches to CAN communication status.
Function of Detecting Ignition Relay Malfunction
- When the integrated ignition relay is stuck in a "closed contact" position and cannot be turned OFF, IPDM E/R turns ON tail and parking lamps for 10 minutes to indicate IPDM E/R malfunction.
- When the state of the integrated ignition relay does not agree with the state of the ignition switch signal received via CAN communication, the IPDM E/R activates the tail lamp relay. IGNITION RELAY FUNCTION CHART Ignition switch signal Ignition relay status Tail lamp relay ON ON - OFF OFF - ON OFF - OFF ON ON (10 minutes)
Note. When the ignition switch is turned ON, the tail lamps are OFF.
CONSULT-II Function (IPDM E/R)
CONSULT-II can display each diagnostic item using the diagnostic test modes shown following.
| IPDM E/R diagnostic Mode | Description |
|---|---|
| SELF-DIAG RESULTS | Displays IPDM E/R self-diagnosis results. |
| DATA MONITOR | Displays IPDM E/R input/output data in real time. |
| CAN DIAG SUPPORT MNTR | The result of transmit/receive diagnosis of CAN communication can be read. |
| ACTIVE TEST | Operation of electrical loads can be checked by sending drive signal to them. |
CONSULT-II FUNCTION CHART
Display Item List
| Display items | CONSULT-II display code | Malfunction detection | TIME | Possible causes | |
|---|---|---|---|---|---|
| CRNT | PAST | ||||
| NO DTC IS DETECTED. FURTHER TESTING MAY BE REQUIRED. | |||||
| CAN COMM CIRC | U1000 | If CAN communication reception/transmission data has a malfunction, or if any of the control units fail, data reception/transmission cannot be confirmed. When the data in CAN communication is not received before the specified time. | X | X | Any of items listed below have errors: TRANSMIT DIAG ECM BCM/SEC |
DISPLAY ITEM LIST
Note. The details for display of the period are as follows: CRNT: Error currently detected with IPDM E/R. PAST: Error detected in the past and placed in IPDM E/R memory.
| Item name | CONSULT-II screen display | Display or unit | Monitor item selection | Description | ||
|---|---|---|---|---|---|---|
| ALL SIGNALS | MAIN SIGNALS | SELECTION FROM MENU | ||||
| Motor fan request | MOTOR FAN REQ | 1/2/3/4 | X | X | X | Signal status input from ECM |
| Compressor request | AC COMP REQ | ON/OFF | X | X | X | Signal status input from ECM |
| Parking, license, and tail lamp request | TAIL & CLR REQ | ON/OFF | X | X | X | Signal status input from BCM |
| Headlamp low beam request | HL LO REQ | ON/OFF | X | X | X | Signal status input from BCM |
| Headlamp high beam request | HL HI REQ | ON/OFF | X | X | X | Signal status input from BCM |
| Front fog request | FR FOG REQ | ON/OFF | X | X | X | Signal status input from BCM |
| FR wiper request | FR WIP REQ | STOP/1LO/LO/HI | X | X | X | Signal status input from BCM |
| Wiper auto stop | WIP AUTO STOP | ACT P/STOP P | X | X | X | Output status of IPDM E/R |
| Wiper protection | WIP PROT | OFF/LS/HS/Block | X | X | X | Control status of IPDM E/R |
| Starter request | ST RLY REQ | ON/OFF | X | X | Status of input signal NOTE | |
| Ignition relay status | IGN RLY ON/OFF | X | X | X | X | Ignition relay status monitored with IPDM E/R |
| Rear defogger request | RR DEF REQ | ON/OFF | X | X | X | Signal status input from BCM |
| Oil pressure switch | OIL P SW | OPEN/CLOSE | X | X | Signal status input from IPDM E/R | |
| Hood switch | HOOD SW ( (1) ) | OFF | X | Signal status input from IPDM E/R | ||
| Theft warning horn request | THFT HRN REQ ( (1) ) | ON/OFF | X | X | Signal status input from BCM | |
| Horn chirp | HORN CHIRP | ON/OFF | X | X | Output status of IPDM E/R | |
| Cornering lamp request | CRNRNG LMP REQ | OFF/LEFT/RIGHT | X | X | Signal status input from BCM | |
| NOTE: Perform monitoring of IPDM E/R data with the ignition switch ON. When the ignition switch is in ACC position, display may not be correct. | ||||||
| (1) This item is displayed, but does not function. | ||||||
| NOTE |
|---|
| Perform monitoring of IPDM E/R data with the ignition switch ON. When the ignition switch is in ACC position, display may not be correct. |
| (1) | This item is displayed, but does not function. |
CONSULT-II SCREEN VALUE DESCRIPTION CHART
CONNECTOR SYMBOL
Main symbols of connector (in Harness Layout) are indicated below.
Scheme 45
Scheme 46
Scheme 47
Scheme 48
Scheme 49
Refer to , " ENGINE ROOM HARNESS (RH VIEW) " for continuation of engine room harness.
Scheme 50
Scheme 51
Scheme 52
Refer to , " ENGINE ROOM HARNESS (LH VIEW) " for continuation of engine room harness.
Scheme 53
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NORMAL OPEN, NORMAL CLOSED AND MIXED TYPE RELAYS
Relays can mainly be divided into three types: normal open, normal closed and mixed type relays.
Scheme 67
Scheme 68
| 1M | 1 Make | 2M | 2 Make |
|---|---|---|---|
| 1T | 1 Transfer | 1M.1B | 1 Make 1 Break |
STANDARDIZED RELAY
