Infiniti M35/M45 Y50. Manual - part 559

SNOW MODE SWITCH

EC-709

[VQ35DE]

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SNOW MODE SWITCH

PFP:25310

Description

NBS0058Q

NOTE:
If DTC U1000 or U1001 are displayed, first perform the trouble diagnosis for DTC U1000, U1001.
Refer to 

EC-161, "DTC U1000, U1001 CAN COMMUNICATION LINE"

 .

If DTC U1010 is displayed, first perform the trouble diagnosis for DTC U1010.
Refer to 

EC-164, "DTC U1010 CAN COMMUNICATION"

 .

The snow mode switch signal is sent to the “unified meter and A/C amp.” from the snow mode switch. The
“unified meter and A/C amp.” then sends the signal to the ECM by CAN communication line.
The snow mode is used for driving or starting the vehicle on snowy roads or slippery areas. If the snow mode
is activated, the vehicle speed will not be accelerated immediately than your original pedal in due to avoid the
vehicle slip. In other words, ECM controls the rapid engine torque change by controlling the electric throttle
control actuator operating speed.

CONSULT-II Reference Value in the Data Monitor Mode

NBS0058R

MONITOR ITEM

CONDITION

SPECIFICATION

SNOW MODE SW

●

Ignition switch: ON

SNOW MODE SW: ON

ON

SNOW MODE SW: OFF

OFF

EC-710

[VQ35DE]

SNOW MODE SWITCH

Wiring Diagram

NBS0058S

TBWT1003E

SNOW MODE SWITCH

EC-711

[VQ35DE]

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Diagnostic Procedure

NBS0058T

1. 

CHECK SNOW MODE SWITICH OVERALL FUNCTION-I

1.

Turn ignition switch ON.

2.

Select “SNOW MODE SW” in “DATA MONITOR” mode with
CONSULT-II.

3.

Check “SNOW MODE SW” indication under the following condi-
tions.

OK or NG

OK

>> GO TO 2.

NG

>> GO TO 3.

2. 

CHECK SNOW MODE SWITICH OVERALL FUNCTION-II

1.

Turn ignition switch ON.

2.

Start engine.

3.

Check the snow mode indicator in the snow mode switch under the following condition.

OK or NG

OK

>> INSPECTION END

NG

>> GO TO 7.

3. 

CHECK DTC WITH “UNIFIED METER AND A/C AMP.”

Refer to 

DI-31, "SELF-DIAG RESULTS"

 .

OK or NG

OK

>> GO TO 4.

NG

>> Go to 

DI-28, "UNIFIED METER AND A/C AMP"

 .

4. 

CHECK SNOW MODE SWITCH POWER SUPPLY CIRCUIT

1.

Turn ignition switch OFF.

2.

Disconnect snow mode switch harness connector.

3.

Turn ignition switch ON.

4.

Check voltage between snow mode switch terminal 1 and
ground with CONSULT-II or tester.

OK or NG

OK

>> GO TO 6.

NG

>> GO TO 5.

CONDITION

INDICATION

Snow mode switch: ON

ON

Snow mode switch: OFF

OFF

PBIB2009E

CONDITION

INDICATION

Snow mode switch: ON

ON

Snow mode switch: OFF

OFF

Voltage: Battery voltage.

PBIB2562E

EC-712

[VQ35DE]

SNOW MODE SWITCH

5. 

DETECT MALFUNCTIONING PART

Check the following.

●

Harness connectors E108, M15

●

IPDM E/R harness connector E7

●

10A fuse

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Harness for open or short between snow mode switch and fuse.

>> Repair open circuit or short to ground or short to power in harness or connectors.

6. 

CHECK SNOW MODE SWITCH INPUT SIGNAL CIRCUIT FOR OPEN AND SHORT

1.

Turn ignition switch OFF.

2.

Disconnect “unified meter and A/C amp.” harness connector.

3.

Check harness continuity between snow mode switch terminal 4 and “unified meter and A/C amp.” termi-
nal 23. Refer to Wiring Diagram.

4.

Also check harness for short to ground and short to power.

OK or NG

OK

>> GO TO 9.

NG

>> Repair open circuit or short to ground or short to power in harness or connectors.

7. 

CHECK GROUND CONNECTIONS

1.

Turn ignition switch OFF.

2.

Loosen and retighten two ground screws on the body.
Refer to 

EC-160, "Ground Inspection"

 .

OK or NG

OK

>> GO TO 8.

NG

>> Repair or replace ground connections.

8. 

CHECK SNOW MODE INDICATOR LAMP GROUND CIRCUIT FOR OPEN AND SHORT

1.

Check harness continuity between snow mode switch terminal 2 and ground.
Refer to Wiring Diagram.

2.

Also check harness for short to power.

OK or NG

OK

>> GO TO 9.

NG

>> Repair open circuit or short to power in harness or connectors.

Continuity should exist.

1.

Body ground M70

2.

Body ground M16

PBIB2782E

Continuity should exist.