Honda Ridgeline. Manual - part 258

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Electronic Control System

VTM-4 Control Unit Electrical Connections

15-14

Rear Differential

System Description (cont’d)

VTM 4LOCK SWITCH

A8

LOCKSW

REAR DIFFERENTIAL

IGNITION SWITCH

VTM 4 LOCK INDICATOR

VTM 4 INDICATOR

B5

PG

A18

K LINE

SCS

A20

A11

CANH

CANL

A22

NEP

A12

PARKING BRAKE SWITCH

A5

RLP

RRP

A3

A7

FRP

A1

A4

VTM 4 RELAY

IG1

TOL

A13

A15

TOH

PWR

B7

A16

PARBRK

B12

LG2

LG1

A10

LOCKL

A16

LCOL

B2

RCOL

B4

B11

WARN2

FLP

A9

WARN1

A14

VTM 4 CONTROL UNIT

IG1

FSR

B1

B3

LCOH

RCOH

BATTERY

IG1 HOT in ON (II) and
START (III)

RIGHT CLUTCH
ELECTROMAGNETIC
COIL

LEFT CLUTCH
ELECTROMAGNETIC
COIL

DIFFERENTIAL
OIL
TEMPERATURE
SENSOR

VSA
MODULATOR
CONTROL
UNIT

POWERTRAIN
CONTROL
MODULE
(PCM)

DATA LINK
CONNECTOR

GAUGE CONTROL
MODULE

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VTM-4 Control Unit Inputs and Outputs

Terminal

number

Wire color

Terminal sign

(Terminal name)

Description

Measurement

Conditions

Voltage

15-15

VTM-4 Control Unit Connector Terminal Locations

B (12P)

A (22P)

The VTM-4 control unit terminal voltage and measuring conditions for the 4WD control system are shown.

NOTE: Measure voltage with the connectors connected.

A1

YEL

IG1 (Ignition 1)

Power supply for
activating the system

Ignition switch
ON (II)

Battery voltage

A3

GRY/RED

RRP (Rear right
pulse)

Detect right-rear wheel
sensor signal

Turn wheel at 1
rotation/second

A4

ORN/GRN

FSR (Fail-safe
relay)

Drives VTM-4 relay

Ignition switch
ON (II)

Battery voltage

Engine running

Less than 1 V

A5

GRY/YEL

RLP (Rear left
pulse)

Detects left-rear wheel
sensor signal

Turn wheel at 1
rotation/second

A6

GRN/ORN

PARBRK (Parking
brake)

Detects parking brake
signal

Parking brake on

Less than 2 V

Parking brake off

Battery voltage

A7

LT GRN

FRP (Front right
pulse)

Detects right-front
wheel sensor signal

Turn wheel at 1
rotation/second

A8

BRN/WHT

LOCKSW (LOCK
switch)

Detects VTM-4 LOCK
switch signal

Ignition switch
ON (II)

Less than 1 V

VTM-4 LOCK mode

Battery voltage

A9

WHT/RED

FLP (Front left
pulse)

Detects left-front wheel
sensor signal

Turn wheel at 1
rotation/second

(cont’d)

There should be 0
about 5 V repeatedly.
(A digital voltmeter
reads about 2.5 V when
the wheel is turning
faster.)

There should be 0
about 5 V repeatedly.
(A digital voltmeter
reads about 2.5 V when
the wheel is turning
faster.)

There should be 0
about 5 V repeatedly.
(A digital voltmeter
reads about 2.5 V when
the wheel is turning
faster.)

There should be 0
about 5 V repeatedly.
(A digital voltmeter
reads about 2.5 V when
the wheel is turning
faster.)

Wire side of female terminals

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VTM-4 Control Unit Inputs and Outputs

Terminal

number

Wire color

Terminal sign

(Terminal name)

Description

Measurement

Conditions

Voltage

15-16

Rear Differential

System Description (cont’d)

VTM-4 Control Unit Connector Terminal Locations

B (12P)

A (22P)

The VTM-4 control unit terminal voltage and measuring conditions for the 4WD control system are shown.

NOTE: Measure voltage with the connectors connected.

A10

BLK

LG1 (Logic ground)

Ground

Less than 0.5 V

A11

WHT

CANH
(CAN
communication
signal high)

CAN communication
signal

Ignition switch
ON (II)

About 2.5 V (pulses)

A12

BLU

NEP
(Engine revolution)

Detects engine
revolution signal

Ignition switch
ON (II)

Above 8 V

Engine running at
1,000 rpm

5

8 V

A13

BLK

TOL
(Temperature oil
low)

Detects differential oil
temperature sensor
signal

Check at normal
temperature with
the ignition switch
ON (II)

1

3.6 V

A14

RED/WHT

WARN1 (Warning
1)

Drives VTM-4 indicator

VTM-4 indicator on

Less than 4 V

VTM-4 indicator off

Battery voltage

A15

WHT

TOH
(Temperature oil
high)

Power supply for
differential oil
temperature sensor

Check at normal
temperature with
the ignition switch
ON (II)

4

5 V

A16

YEL/BLK

LOCKL (Lock lamp)

Drives VTM-4 LOCK
indicator

VTM-4 LOCK
indicator on

Less than 4 V

VTM-4 LOCK
indicator off

Battery voltage

A18

LT BLU

K-LINE

Communication signal
to HDS

Ignition switch
ON (II) (Not
connected to HDS)

About 9.0 V

A20

BRN

SCS
(Service check
signal)

Detects service check
connector signal

SCS circuit shorted

Less than 2 V

SCS circuit opened

About 5 V

A22

RED

CANL
(CAN
communication
signal low)

CAN communication
signal

Ignition switch
ON (II)

About 2.5 V (pulses)

Wire side of female terminals

Terminal

number

Wire color

Terminal sign

(Terminal name)

Description

Measurement

Conditions

Voltage

15-17

B1

BLK/RED

LCOH (Left coil
high)

Drives left clutch
electromagnetic coil
(positive)

Ignition switch
ON (II)

Less than 1 V

Engine running

Less than 1 V

VTM-4 LOCK mode

Above 3 V

B2

BLK/WHT

LCOL (Left coil
low)

Drives left clutch
electromagnetic coil
(negative)

Ignition switch
ON (II)

Less than 1 V

Engine running

Less than 1 V

VTM-4 LOCK mode

Less than 1 V

B3

BRN

RCOH (Right coil
high)

Drives right clutch
electromagnetic coil
(positive)

Ignition switch
ON (II)

Less than 1 V

Engine running

Less than 1 V

VTM-4 LOCK mode

Above 3 V

B4

GRN

RCOL (Right coil
low)

Drives right clutch
electromagnetic coil
(negative)

Ignition switch
ON (II)

Less than 1 V

Engine running

Less than 1 V

VTM-4 LOCK mode

Less than 1 V

B5

BLK

PG (Power ground)

Ground

Less than 0.5 V

B7

RED/BLU

PWR (Power)

Power supply for
VTM-4 control unit

10 seconds after
ignition switch
ON (II)

Less than 3 V

Engine running

Battery voltage

VTM-4 LOCK mode

Battery voltage

B11

RED/WHT

WARN2 (Warning
2)

Drives VTM-4 indicator

VTM-4 indicator on

Less than 4 V

VTM-4 indicator off

Battery voltage

B12

BLK

LG2 (Logic ground)

Ground

Less than 0.5 V