Isuzu N-Series. Manual - part 1164

8-368 CAB AND CHASSIS ELECTRICAL

Diagnostic Mode

Door Lock Operational Test

1. Check for continuity between the 1-B-219 connec-

tor and the 2-B-219 connector (harness side).

2. Check the remaining connectors to see that they

have battery voltage.

3. If the above conditions are normal but the lock

does not operate, check the door lock switch (driv-
er’s door).
Refer to the item below.

N8A5454E

5 6

1 2

9

8

10

4

3

7

Connector

1(B/R)

2(G/R)

Position

Unlock

Lock

B-219

Harness side

+

+

-

-

N8A5455E

CAB AND CHASSIS ELECTRICAL 8-369

Door Lock Switch Inspection

Check for continuity between the connectors. If there is
no continuity, the switch must be replaced.

Control Unit Removal

1. Remove the meter cluster. Refer to the item “Meter

assembly” in this Manual.

2. Release the pawl to remove the brackets holding

the tail lamp and stop lamp warning light relays.

3. Remove the connectors.
4. Remove the distributor from its bracket.
5. Loosen the fixing screws.
6. Remove the control unit from the bracket.

Control Unit Installation

Follow the removal steps in reverse order to install the
control unit.

1

4

2

5

3

6

Connector 

             number

Position

5

6

4

Lock

Unlock

D-4

Door lock switch side

N8A5456E

Connector

Control unit for
keyless entry system

Distributor

N8A5457E

Bracket

N8A5458E

8-370 CAB AND CHASSIS ELECTRICAL

Circuit Diagram

OFF

D

ACC

ST

ON

OFF

DOOR

ON

BATTERY

6

35

74

2

1

FTX

2L

0.5R

0.5Y

0.5GR

0.3B

0.3B

0.5B

0.5G/Y

0.5G/R

0.5BR/R

0.5BR/Y

0.5BR/R

0.5BR/Y

0.5BR/R

0.5BR/Y

0.85BR/R

0.85BR/Y

0.85BR/R

0.85BR/Y

0.85BR/R

0.85BR/Y

0.3R/G

0.3G/B

0.5B

0.85B

0.5R/Y

0.5B

0.5GR/B

0.5LG/R

RELAY

:

T

AIL

0.5GR/R

0.5GR/R

0.85R

0.5GR/R

14

32

RADIO

CIGAR LIGHTER

ROOM LAMP

RELAY:
DOOR LOCK

ACTUA

TOR 

(AS)

ACTUATOR ASSY

(DR)

ACTUA

TOR FOR RH

REAR DOOR LOCK 

(DUAL CAB TYPE)

ACTUA

TOR FOR LH

REAR DOOR LOCK 

(DUAL CAB TYPE)

KEY SW

ANT

SW:
ROOM LAMP

SW:DOOR (DR SIDE)

SW:DOOR (AS SIDE)

3R/Y

0.85R

0.5R

F-15

AUDIO(IG),

CIGAR LIGHTER

15A

KEY SW

50A

FL-2

MAIN

100A

FL-1

AUDIO(B),

DOOR LOCK

15A

F-4

N8A5459E

CAB AND CHASSIS ELECTRICAL 8-371

ABS (Anti-lock Brake System, Without ASR)

Parts Location

H-16

H-17

H-14

H-15

J-74 F/RH SENSOR

H-5

~

H-8

B-66 STOPLIGHT SW

B-89 CLUTCH SW

B-79 

DATA LINK

CONNECTOR

B-69 EXH. BRAKE SW

(BRAKE SW)

B-1 EAR

TH ;

 FRAME (FR)

B-67 IGNITION SW "A"

B-7 EAR

TH ;

 HEADLIGHT B/T

B-233,B-234 ECM

FUSE BOX ASM

F-2,F-5,F-16 

STARTER SW

J-148 R/RH

P-5

H-13

J-31 EXH. BRAKE

MAGNETIC VALVE

SENSOR (24V)

J-149 R/LH

SENSOR (24V)

R-6

STOPLIGHT (RH)

R-1

STOPLIGHT (LH)

SENSOR (12V)

J-177

ABS EHCU

B-51 ABS 

J-75 F/LH SENSOR

J-9 EAR

TH ;

 FRAME

(12V)

(24V)

J-78 R/RH,R/LH

P-1

~

P-4

BATTERY    

W

ARNING LIGHT (METER)

B-52 EXH. BRAKE

IND. LAMP (METER) 

B-75 ACCEL SW

RELAY BOX ASM (NO.1)

X-5 ABS INDICATOR RELAY

X-8 EXHAUST BRAKE RELAY (24V)

X-25 EXHAUST BRAKE CONTOROL RELAY

X-28 EXHAUST BRAKE CUT RELAY

J-23 DIODE

FL-1,FL-2,FL-9 FUSIBLE LINK

N8A5607E