Nissan Altima L32. Instruction — part 995

PCS-44

< ECU DIAGNOSIS >

[IPDM E/R]

IPDM E/R (INTELLIGENT POWER DISTRIBUTION MODULE ENGINE ROOM)

If No CAN Communication Is Available With BCM

IGNITION RELAY MALFUNCTION DETECTION FUNCTION

• IPDM E/R monitors the voltage at the contact circuit and excitation coil circuit of the ignition relay inside it.

• IPDM E/R judges the ignition relay error if the voltage differs between the contact circuit and the excitation

coil circuit.

• If the ignition relay cannot turn OFF due to contact seizure, it activates the tail lamp relay for 10 minutes to

alert the user to the ignition relay malfunction when the ignition switch is turned OFF.

NOTE:
The tail lamp turns OFF when the ignition switch is turned ON.

FRONT WIPER CONTROL

IPDM E/R detects front wiper stop position by a front wiper auto stop signal.

When a front wiper auto stop signal is in the conditions listed below, IPDM E/R stops power supply to wiper

after repeating a front wiper 10 second activation and 20 second stop five times.

NOTE:

This operation status can be confirmed on the IPDM E/R “Data Monitor” that displays “BLOCK” for the item

“WIP PROT” while the wiper is stopped.

Control part

Fail-safe in operation

Cooling fan

• Signals cooling fans ON when the ignition switch is turned ON
• Signals cooling fans OFF when the ignition switch is turned OFF

A/C compressor

A/C relay OFF

Generator

Outputs the power generation command signal (PWM signal) 0%

Control part

Fail-safe in operation

Headlamp

• Turns ON the headlamp low relay when the ignition switch is turned ON
• Turns OFF the headlamp low relay when the ignition switch is turned OFF
• Headlamp high relay OFF

• Parking lamps
• License plate lamps
• Illumination
• Tail lamps

• Turns ON the tail lamp relay when the ignition switch is turned ON
• Turns OFF the tail lamp relay when the ignition switch is turned OFF

Front wiper

• The status just before activation of fail-safe control is maintained until the ignition

switch is turned OFF while the front wiper is operating at LO or HI speed.

• The wiper is operated at LO speed until the ignition switch is turned OFF if the fail-

safe control is activated while the front wiper is set in the INT mode and the front wiper
motor is operating.

Front fog lamps (if equipped)

Front fog lamp relay OFF

Horn

Horn OFF

Ignition relay

The status just before activation of fail-safe is maintained.

Starter motor

Starter control relay OFF

Electronic steering column lock unit

Electronic steering column lock relay OFF

DTC

Ignition switch

Ignition relay

Tail lamp relay

—

ON

ON

—

—

OFF

OFF

—

B2098: IGN RELAY ON

OFF

ON

ON (10 minutes)

B2099: IGN RELAY OFF

ON

OFF

—

Ignition switch

Front wiper switch

Auto stop signal

ON

OFF

Front wiper stop position signal cannot be
input 10 seconds.

ON

The signal does not change for 10 seconds.

PCS

IPDM E/R (INTELLIGENT POWER DISTRIBUTION MODULE ENGINE ROOM)

PCS-45

< ECU DIAGNOSIS >

[IPDM E/R]

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STARTER MOTOR PROTECTION FUNCTION

IPDM E/R turns OFF the starter control relay to protect the starter motor when the starter control relay remains

active for 90 seconds.

DTC Index

INFOID:0000000004202424

NOTE:

The details of TIME display are as follows.

• CRNT: The malfunctions that are detected now

• 1 - 39: The number is indicated when it is normal at present and a malfunction was detected in the past. It

increases like 0

→ 1 → 2 · · · 38 → 39 after returning to the normal condition whenever IGN OFF → ON. It is

fixed to 39 until the self-diagnosis results are erased if it is over 39. It returns to 0 when a malfunction is

detected again in the process.

CONSULT-III display

Fail-safe

TIME

NOTE

Refer to

No DTC is detected.
further testing
may be required.

—

—

—

—

U1000: CAN COMM CIRCUIT

×

CRNT

1 – 39

PCS-20

B2098: IGN RELAY ON

×

CRNT

1 – 39

PCS-21

B2099: IGN RELAY OFF

—

CRNT

1 – 39

PCS-22

B2108: STRG LCK RELAY ON

—

CRNT

1 – 39

SEC-42

B2109: STRG LCK RELAY OFF

—

CRNT

1 – 39

SEC-43

B210A: STRG LCK STATE SW

—

CRNT

1 – 39

SEC-44

B210B: START CONT RLY ON

—

CRNT

1 – 39

SEC-48

B210C: START CONT RLY OFF

—

CRNT

1 – 39

SEC-49

B210D: STARTER RELAY ON

—

CRNT

1 – 39

SEC-50

B210E: STARTER RELAY OFF

—

CRNT

1 – 39

SEC-51

B210F: INTRLCK/PNP SW ON

—

CRNT

1 – 39

SEC-54

B2110: INTRLCK/PNP SW OFF

—

CRNT

1 – 39

SEC-59

PCS-46

< PRECAUTION >

[IPDM E/R]

PRECAUTIONS

PRECAUTION

PRECAUTIONS

Precaution for Supplemental Restraint System (SRS) "AIR BAG" and "SEAT BELT
PRE-TENSIONER"

INFOID:0000000004202425

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 SR and SB section of this Service Man-

ual.

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 SR section.

• Do not use electrical test equipment on any circuit related to the SRS unless instructed to in this

Service Instruction. SRS wiring harnesses can be identified by yellow and/or orange harnesses or har-

ness connectors.

Precautions Necessary for Steering Wheel Rotation after Battery Disconnect

INFOID:0000000004460432

NOTE:

• Before removing and installing any control units, first turn the push-button ignition switch to the LOCK posi-

tion, then disconnect both battery cables.

• After finishing work, confirm that all control unit connectors are connected properly, then re-connect both

battery cables.

• Always use CONSULT-III to perform self-diagnosis as a part of each function inspection after finishing work.

If a DTC is detected, perform trouble diagnosis according to self-diagnosis results.

This vehicle is equipped with a push-button ignition switch and a steering lock unit.

If the battery is disconnected or discharged, the steering wheel will lock and cannot be turned.

If turning the steering wheel is required with the battery disconnected or discharged, follow the procedure

below before starting the repair operation.

OPERATION PROCEDURE

1. Connect both battery cables.

NOTE:

Supply power using jumper cables if battery is discharged.

2. Carry the Intelligent Key or insert it to the key slot and turn the push-button ignition switch to ACC position.

(At this time, the steering lock will be released.)

3. Disconnect both battery cables. The steering lock will remain released with both battery cables discon-

nected and the steering wheel can be turned.

4. Perform the necessary repair operation.
5. When the repair work is completed, re-connect both battery cables. With the brake pedal released, turn

the push-button ignition switch from ACC position to ON position, then to LOCK position. (The steering

wheel will lock when the push-button ignition switch is turned to LOCK position.)

6. Perform self-diagnosis check of all control units using CONSULT-III.

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PRECAUTIONS

PCS-47

< PRECAUTION >

[IPDM E/R]

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Precaution for Procedure without Cowl Top Cover

INFOID:0000000004202426

When performing the procedure after removing cowl top cover, cover

the lower end of windshield with urethane, etc.

PIIB3706J