Nissan Frontier D40. Manual - part 318

LOCK INDICATOR LAMP

DLN-293

< COMPONENT DIAGNOSIS >

[REAR FINAL DRIVE: M226 (ELD) ]

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DLN

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LOCK INDICATOR LAMP

Description

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The DIFF LOCK indicator lamp has power available to it any time the ignition switch is in the ON or START
position. The differential lock control unit supplies ground to activate the DIFF LOCK indicator lamp. The DIFF
LOCK indicator lamp will go through a prove out at initial key ON. The DIFF LOCK will flash while the differen-
tial lock system is activating or while waiting for conditions to be met to activate. Once the differential lock has
been engaged, the DIFF LOCK indicator lamp will remain ON. For more information about the DIFF LOCK
indicator lamp, refer to the Owner’s Manual. 

Component Function Check

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1.

CHECK DIFF LOCK INDICATOR LAMP OPERATION

1.

Turn the ignition switch ON.

2.

Observe the DIFF LOCK indicator lamp.

Does the DIFF LOCK indicator lamp prove out normally?

YES

>> DIFF LOCK indicator lamp is operating normally.

NO, ALWAYS ON>> Perform self diagnostics on differential lock control unit. Refer to 

DLN-272, "DIFFEREN-

TIAL LOCK CONTROL UNIT : CONSULT-III Function (DIFF LOCK)"

.

NO, ALWAYS OFF>>Check DIFF LOCK indicator lamp control circuit. Refer to 

DLN-293, "Diagnosis Proce-

dure"

.

Diagnosis Procedure

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Regarding Wiring Diagram information, refer to 

DLN-296, "Wiring Diagram"

.

1.

CHECK DIFFERENTIAL LOCK CONTROL UNIT POWER AND GROUND SUPPLY

Check the differential lock control unit power and ground supply. Refer to 

DLN-275, "Diagnosis Procedure"

.

Is the inspection result normal?

YES

>> GO TO 2.

NO

>> Repair or replace malfunctioning component. 

2.

CHECK HARNESS BETWEEN DIFFERENTIAL LOCK CONTROL UNIT AND COMBINATION METER

1.

Turn ignition switch OFF.

2.

Disconnect differential lock control unit harness connector and
combination meter harness connector.

3.

Check continuity between differential lock control unit harness
connector M70 (A) terminal 21 and combination meter harness
connector M24 (B) terminal 25.

4.

Check continuity between differential lock control unit harness
connector M70 (A) terminal 21 and ground.

Is the inspection result normal?

Ignition switch ON

Indicator prove out

A

B

Continuity

Connector

Terminal

Connector

Terminal

M70

21

M24

25

Yes

A

—

Continuity

Connector

Terminal

M70

21

Ground

No

AWDIA0312ZZ

DLN-294

< COMPONENT DIAGNOSIS >

[REAR FINAL DRIVE: M226 (ELD) ]

LOCK INDICATOR LAMP

YES

 >> Replace combination meter. Refer to 

MWI-95, "Removal and Installation"

.

NO

>> Repair harness or connector.

DIFFERENTIAL LOCK CONTROL UNIT

DLN-295

< ECU DIAGNOSIS >

[REAR FINAL DRIVE: M226 (ELD) ]

C

E

F

G

H

I

J

K

L

M

A

B

DLN

N

O

P

ECU DIAGNOSIS

DIFFERENTIAL LOCK CONTROL UNIT

Reference Value

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DIFFERENTIAL LOCK CONTROL UNIT TERMINAL CONNECTOR LAYOUT

Data are reference value and are measured between each terminal and ground.

CAUTION:

When using a circuit tester to measure voltage for inspection, be sure not to extend forcibly any connector terminals.

SDIA2573E

Terminal No.

(Wire color)

Description

Condition

Voltage (V) (Ap-

prox.)

+

-

Signal name

Input/

Output

1

(W/G)

Ground

Ign power supply

Input

Ignition ON or START

Battery voltage

2

(W/G)

Ground

Ign power supply

Input

Ignition ON or START

Battery voltage

3

(B)

Ground

Ground

Input

Ignition ON

Less than 0.2V

4

(P)

–

CAN-L

–

–

5

(L)

–

CAN-H

–

–

9

(Y)

Ground

Differential lock mode switch 
(ON)

Input

Differential lock mode switch: ON

Battery voltage

Differential lock mode switch: OFF

0V

10

(B)

Ground

Ground

Input

Ignition ON

Less than 0.2V

11

(GR)

Ground

Differential lock solenoid 
(LO)

Output

Differential lock mode switch: ON

0V

Differential lock mode switch: OFF

Battery voltage

12

(L)

Ground

Differential lock solenoid 
(HIGH)

Output

Differential lock mode switch: ON

0V

Differential lock mode switch: OFF

Battery voltage

13

(SB)

–

K-LINE

–

–

–

15

(R/Y)

Ground

Battery power supply
(Memory back-up)

Input

Ignition OFF

Battery voltage

20

(BR)

Ground

Differential lock position 
switch

Input

Differential lock mode switch: ON
(DIFF LOCK indicator lamp: ON)

0V

Differential lock mode switch: OFF
(DIFF LOCK indicator lamp: OFF)

Battery voltage

21

(SB)

Ground

DIFF LOCK indicator lamp

Output

DIFF LOCK indicator lamp: ON

0V

DIFF LOCK indicator lamp: OFF

Battery voltage

22

(G)

Ground

Differential lock mode switch 
(OFF)

Input

Differential lock mode switch: ON

0V

Differential lock mode switch: OFF

Battery voltage

DLN-296

< ECU DIAGNOSIS >

[REAR FINAL DRIVE: M226 (ELD) ]

DIFFERENTIAL LOCK CONTROL UNIT

Wiring Diagram

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ABDWA0149GB