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 article. 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 malfunction. Never wrap outside of fusible link with vinyl tape. Important: Never let fusible link touch any other wiring harness, vinyl or rubber parts. |
Scheme 52
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 53
- Power windows
- Power sunroof
Circuit Breaker
The PTC thermistor generates heat in response to current flow. The temperature (and resistance) of the thermistor element varies with current flow. Excessive current flow will cause the element's temperature to rise. When the temperature reaches a specified level, the electrical resistance will rise sharply to control the circuit current.
Reduced current flow will cause the element to cool. Resistance falls accordingly and normal circuit current flow is allowed to resume.
Scheme 54
SYSTEMS CONTROLLED BY IPDM E/R
- Lamp control Using CAN communication lines, it receives signals from the BCM and controls the following lamps: Headlamps (High, Low) Parking lamps Tail and license plate 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 (magnet clutch).
- Starter control Using CAN communication lines, it receives signals from the BCM and controls the starter relay.
- 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.
- Daytime light system control (Canada only) Using CAN communication lines, it receives signals from the BCM and controls the daytime light 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
| Controlled system | Fail-safe mode |
|---|---|
| Headlamp | With the ignition switch ON, headlamp low relay is ON, headlamp high relays are OFF, and daytime light system (Canada only) is OFF. With the ignition switch OFF, the headlamp relays are OFF. |
| Tail, license plate and parking lamps | With the ignition switch ON, the tail lamp relay is ON. With the ignition switch OFF, the tail lamp relay is OFF. |
| Cooling fan | With the ignition switch ON, cooling fan relay-1, relay-2, and relay-3 are ON. With the ignition switch OFF, all cooling fan relays are OFF. |
| Front wiper | Until the ignition switch is turned off, the front wiper relays remain in the same status they were in just before fail-safe control was initiated. |
| Rear window defogger | Rear window defogger relay OFF |
| A/C compressor | A/C relay is OFF |
| Front fog lamps | Front fog lamp relay OFF |
FAIL-SAFE MODE CHART
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 switch signal | Ignition relay status | Tail lamp relay |
|---|---|---|
| ON | ON | |
| OFF | OFF | |
| ON | OFF | |
| OFF | ON | ON (10 minutes) |
FAIL-SAFE MODE CHART
Note. When the ignition switch is turned ON, the tail lamps are OFF.
CONSULT-III Function (IPDM E/R)
CONSULT-III 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-III FUNCTION CHART
Display Item List
| Display items | CONSULT-III 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 |
| X: Applicable | |||||
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-III 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 (1) | |
| Ignition relay status | IGN RLY | ON/OFF | 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 (2) | OFF | X | X | Signal status input from IPDM E/R | |
| Theft warning horn request | THFT HRN REQ | ON/OFF | X | X | Signal status input from BCM | |
| Horn chirp | HORN CHIRP | ON/OFF | X | X | Output status of IPDM E/R | |
| Daytime light request | DTRL REQ | ON/OFF | X | X | Signal status input from BCM | |
| (1) 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. (2) This item is displayed, but does not function. | ||||||
| (1) | 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. |
| (2) | This item is displayed, but does not function. |
ALL SIGNALS, MAIN SIGNALS, SELECTION MENU
CAN DIAG SUPPORT MNTR
Refer to " SYSTEM DESCRIPTION ".
| Test name | CONSULT-III screen display | Description |
|---|---|---|
| Head, tail, fog lamp output | EXTERNAL LAMP | With a certain ON-OFF operation (OFF, TAIL, LO, HI, FOG), the front fog lamp, headlamp low, headlamp high RH, headlamp high LH, and tail lamp relays can be operated. |
| Rear defogger output | REAR DEFOGGER | With a certain ON-OFF operation, the rear defogger relay can be operated. |
| Front wiper (HI, LO) output | FRONT WIPER | With a certain operation (OFF, HI ON, LO ON), the front wiper relays (Lo, Hi) can be operated. |
| Cooling fan output | MOTOR FAN | With a certain operation (1, 2, 3, 4), the cooling fan relays can be operated. |
| Horn output | HORN | With a certain ON-OFF operation, the horn relay can be operated. |
DISPLAY ITEM LIST
Terminals and Reference Values for IPDM E/R
| Terminal | Wire color | Signal name | Signal input/output | Measuring condition | Reference value (Approx.) | ||
|---|---|---|---|---|---|---|---|
| Ignition switch | Operation or condition | ||||||
| 1 | R | Battery power supply | Input | OFF | Battery voltage | ||
| 2 | G | Battery power supply | Input | OFF | Battery voltage | ||
| 3 | Y | ECM Relay | Output | Ignition switch ON or START | Battery voltage | ||
| Ignition switch OFF or ACC | 0V | ||||||
| 4 | G | ECM relay | Output | Ignition switch ON or START | Battery voltage | ||
| Ignition switch OFF or ACC | 0V | ||||||
| 6 | R | Daytime light relay control | Input | ON | Daytime light system active. | Less than battery voltage | |
| Daytime light system inactive. | Battery voltage | ||||||
| 7 | G | ECM relay control | Input | Ignition switch ON or START | 0V | ||
| Ignition switch OFF or ACC | Battery voltage | ||||||
| 8 | G | Throttle control motor relay | Output | Ignition switch ON or START | Battery voltage | ||
| Ignition switch OFF or ACC | 0V | ||||||
| 11 | W | A/C compressor | Output | ON or START | A/C switch ON or defrost A/C switch | Battery voltage | |
| A/C switch OFF or defrost A/C switch | 0V | ||||||
| 12 | O | Ignition switch supplied power | Input | OFF or ACC | 0V | ||
| ON or START | Battery voltage | ||||||
| 14 | LG (M/T) R (A/T or CVT) | Fuse 49 | Output | Ignition switch ON or START | Battery voltage | ||
| Ignition switch OFF or ACC | 0V | ||||||
| 15 | V | Fuse 50 | Output | Ignition switch ON or START | Battery voltage | ||
| Ignition switch OFF or ACC | 0V | ||||||
| 16 | BR | Fuse 51 | Output | Ignition switch ON or START | Battery voltage | ||
| Ignition switch OFF or ACC | 0V | ||||||
| 17 | Y | Battery power supply | Output | Battery voltage | |||
| 19 | R | Starter motor | Output | START | Battery voltage | ||
| 20 | L (with A/C) LG (without A/C) | Cooling fan relay-1 | Output | Conditions correct for cooling fan low operation. | Battery voltage | ||
| Conditions not correct for cooling fan low operation. | 0V | ||||||
| 22 | G | Battery power supply | Input | Battery voltage | |||
| 23 | L | Cooling fan relay-2 | Input | Conditions correct for cooling fan high operation | Battery voltage | ||
| Conditions not correct for cooling fan high operation | 0V | ||||||
| 24 | Y | Cooling fan relay-3 | Output | Conditions correct for cooling fan high operation | Battery voltage | ||
| Conditions not correct for cooling fan high operation | 0V | ||||||
| 26 | O | Tail lamp relay (parking lamps) | Output | Lighting switch in 2nd position | Battery voltage | ||
| 27 | BR | Tail lamp relay (parking lamps) | Output | Lighting switch in 2nd position | Battery voltage | ||
| 28 | GR | Tail lamp relay (parking lamps) | Output | Lighting switch in 2nd position | Battery voltage | ||
| 29 | P | Tail lamp relay (parking lamps) | Output | Lighting switch in 2nd position | Battery voltage | ||
| 30 | R | Fuse 54 | Output | Ignition switch ON or START | Battery voltage | ||
| Ignition switch OFF or ACC | 0V | ||||||
| 31 | LG | Fuse 55 | Output | Ignition switch ON or START | Battery voltage | ||
| Ignition switch OFF or ACC | 0V | ||||||
| 32 | L | Wiper high speed signal | Output | ON or START | Wiper switch | OFF, LO, INT | 0V |
| HI | Battery voltage | ||||||
| 33 | Y | Wiper low speed signal | Output | ON or START | Wiper switch | OFF | 0V |
| LO or INT | Battery voltage | ||||||
| 35 | BR | Starter relay (inhibit switch) | Input | ON or START | Selector lever in "P" or "N" (CVT or A/T) or clutch pedal depressed (M/T) | Battery voltage | |
| Selector lever any other position (CVT or A/T) or clutch pedal released (M/T) | 0V | ||||||
| 36 | BR | Fuel pump relay | Output | Ignition switch ON or START | Battery voltage | ||
| Ignition switch OFF or ACC | 0V | ||||||
| 37 | G | Oil pressure switch | Input | ON or START | Engine running and oil pressure within specification | Battery voltage | |
| Engine not running or oil pressure below specification | 0V | ||||||
| 38 | R | Wiper auto stop signal | Input | ON or START | Wipers not in park position | Battery voltage | |
| Wipers in park position | 0V | ||||||
| 39 | B | Ground | Input | 0V | |||
| 40 | P | CAN-L | ON | ||||
| 41 | L | CAN-H | ON | ||||
| 45 | R | Horn relay control | Input | Horn switch PUSHED, alarm switch activated or door lock/unlock is confirmed when operating lock system via the keyfob | 0V | ||
| Horn switch released, alarm not active, keyfob not active | Battery voltage | ||||||
| 46 | Y | Throttle control motor relay control | Input | Ignition switch ON or START | 0V | ||
| Ignition switch OFF or ACC | Battery voltage | ||||||
| 47 | GR | Fuel pump relay control | Input | Ignition switch ON or START | 0V | ||
| Ignition switch OFF or ACC | Battery voltage | ||||||
| 50 | V | Front fog lamp (LH) | Output | ON or START | Lighting switch must be in the 2ND position (LOW beam is ON) and the front fog lamp switch | OFF | 0V |
| ON | Battery voltage | ||||||
| 51 | W | Front fog lamp (RH) | Output | ON or START | Lighting switch must be in the 2ND position (LOW beam is ON) and the front fog lamp switch | OFF | 0V |
| ON | Battery voltage | ||||||
| 52 | L | LH Low beam headlamp | Output | Lighting switch in 2nd position | Battery voltage | ||
| 54 | P | RH Low beam headlamp | Output | Lighting switch in 2nd position | Battery voltage | ||
| 55 | G | LH High beam headlamp | Output | Lighting switch in 2nd position and placed in HIGH or PASS position | Battery voltage | ||
| 56 | Y | RH High beam headlamp | Output | Lighting switch in 2nd position and placed in HIGH or PASS position | Battery voltage | ||
| 59 | B | Ground | Input | 0V | |||
| 60 | R | Rear window defogger relay | Output | ON or START | Rear defogger Switch ON | Battery voltage | |
| Rear defogger Switch OFF | 0V | ||||||
TERMINALS AND REFERENCE VALUES FOR IPDM E/R
Scheme 55
Scheme 56
- FUSE AND FUSIBLE LINK INSPECTION Check that the following fusible links or IPDM E/R fuses are not blown. FUSE AND FUSIBLE LINK REFERENCE CHART Terminal No. Signal name Fuse, fusible link No. 1, 2 Battery power a, b, d OK or NG OK >> GO TO 2. NG >> Replace fuse or fusible link.
- POWER CIRCUIT INSPECTION Turn ignition switch OFF. Disconnect IPDM E/R harness connector E42. Check voltage between IPDM E/R harness connector E42 terminals 1, 2 and ground. Battery voltage should exist. OK or NG OK >> GO TO 3. NG >> Repair or replace IPDM E/R power circuit harness.
- GROUND CIRCUIT INSPECTION Disconnect IPDM E/R harness connectors E46 and E48. Check continuity between IPDM E/R harness connector E46 (A) terminal 39, E48 (B) terminal 59 and ground. Continuity should exist. OK or NG OK >> Inspection End. NG >> Repair or replace IPDM E/R ground circuit harness.
NORMAL OPEN, NORMAL CLOSED AND MIXED TYPE RELAYS
Relays can mainly be divided into three types: normal open, normal closed and mixed type relays.
