2004 ISUZU TF SERIES switch

11A-40 IMMOBILIZER SYSTEM

B0003 TRANSPONDER KEY PROBLEM
Step Action Value(s) Yes No
1
Was the "Immobilizer System Check" performed? 
Go to Step 2
Go to Immobilizer
System Check
2 Check the key.
Is a key peculiar to a vehicle? 
Go to Step 3
Refer to
Diagnostic Aids
3 Check the immobilizer programming functions.


All transponder (Key).
If a problem is found, repair as necessary.
(Refer to "Important information on Programming")
Was the action complete? 
Go to Step 4
Go to Step 5
4 Recheck the DTC.
1. Key position is “OFF” and keep the position for more
than 30 seconds.
2. Key position is “ON”.
3. Check the DTC on scan tool.
Is DTC B0003 stored? 
Go to Step 5
Verify repair
5 Recheck the DTC.
1. Non-OEM parts switch is "OFF" or remove the Non-
OEM parts.
2. Remove the accessory and another key from key.
3. Move the vehicle to a new location.
4. Key position is “OFF” and keep the position for more
than 30 seconds.
5. Key position is “ON”.
6. Check the DTC on scan tool.
Is DTC B0003 stored? 
Go to Step 6
Verify repair
6 Check the immobilizer coil (antenna) circuit.
1. Key position is “OFF”.
2. Disconnect the immobilizer control unit (ICU).
(immobilizer coil circuit : 3 pin connector)
3. Check the immobilizer coil circuit for an open, short
to ground, or short to voltage.
Also, check the ICU ignition feed circuit for an open or
short to ground and the ICU ground circuit for an open.
Was a problem found? 
Go to Step 7
Go to Step 8
7 Repair or replace the immobilizer coil (antenna) circuit.
Was the action complete? 
Verify repair 
8 Recheck the DTC.
1. Key position is “OFF” and keep the position for more
than 30 seconds.
2. Key position is “ON”.
3. Check the DTC on scan tool.
Is DTC B0003 stored? 
Go to Step 9
Verify repair

11A-50 IMMOBILIZER SYSTEM

B0011 TRANSPONDER KEY PROBLEM (Only 4JA1-T Engine)
Step Action Value(s) Yes No
1
Was the "Immobilizer System Check" performed? 
Go to Step 2
Go to Immobilizer
System Check
2 Check the key.
Is a key peculiar to a vehicle? 
Go to Step 3
Refer to
Diagnostic Aids
3 Check the immobilizer programming functions.


All transponder (Key).
If a problem is found, repair as necessary.
(Refer to "Important information on Programming")
Was the action complete? 
Go to Step 4
Go to Step 5
4 Recheck the DTC.
1. Key position is “OFF” and keep the position for more
than 30 seconds.
2. Key position is “ON”.
3. Check the DTC on scan tool.
Is DTC B0011 stored? 
Go to Step 5
Verify repair
5 Recheck the DTC.
1. Non-OEM parts switch is "OFF" or remove the Non-
OEM parts.
2. Remove the accessory and another key from key.
3. Move the vehicle to a new location.
4. Key position is “OFF” and keep the position for more
than 30 seconds.
5. Key position is “ON”.
6. Check the DTC on scan tool.
Is DTC B0011 stored? 
Go to Step 6
Verify repair
6 Check the immobilizer coil (antenna) circuit.
1. Key position is “OFF”.
2. Disconnect the immobilizer control unit (ICU).
(immobilizer coil circuit : 3 pin connector)
3. Check the immobilizer coil circuit for an open, short
to ground, or short to voltage.
Also, check the ICU ignition feed circuit for an open or
short to ground and the ICU ground circuit for an open.
Was a problem found? 
Go to Step 7
Go to Step 8
7 Repair or replace the immobilizer coil (antenna) circuit.
Was the action complete? 
Verify repair 
8 Recheck the DTC.
1. Key position is “OFF” and keep the position for more
than 30 seconds.
2. Key position is “ON”.
3. Check the DTC on scan tool.
Is DTC B0011 stored? 
Go to Step 9
Verify repair

ANTITHEFT SYSTEM 11B – 1
SECTION 11B
ANTITHEFT SYSTEM
CONTENTS
PAGE
Service Precaution ........................................................................................................ 11B – 3
General Description ...................................................................................................... 11B – 4
Activating the anti-theft system.............................................................................. 11B – 4
Antitheft system alarm operating conditions ........................................................ 11B – 4
Function of a keyless entry system ......................................................................... 11B – 4
Status LED ................................................................................................................. 11B – 4
Hazard relay ............................................................................................................... 11B – 4
Switches .................................................................................................................... 11B – 4
Receiver......................................................................................................................11B – 5
Range of communication ......................................................................................... 11B – 5
Diagnosis ................................................................................................................... 11B – 5
Transmitter (into remote key) .................................................................................. 11B – 5
Transmitter (into remote key) power ...................................................................... 11B – 5
Super lock .................................................................................................................. 11B – 5
No proper transmitter is available, what should be done for the system ?........ 11B – 6
DIAGRAMS AND SCHEMATICS ................................................................................... 11B – 7
SYSTEM WIRING DIAGRAMS .................................................................................. 11B – 7
COMPONENT WIRING LOCATORS (LHD) ............................................................... 11B – 8
WIRING DIAGRAM (LHD).......................................................................................... 11B – 9
WIRING DIAGRAM (LHD).......................................................................................... 11B – 10
WIRING DIAGRAM (LHD).......................................................................................... 11B – 11
WIRING DIAGRAM (LHD).......................................................................................... 11B – 12
WIRING DIAGRAM (RHD with keyless) ................................................................... 11B – 13
WIRING DIAGRAM (Super Lock).............................................................................. 11B – 14
WIRING DIAGRAM (Super Lock).............................................................................. 11B – 15
WIRING DIAGRAM (RHD) ......................................................................................... 11B – 16
WIRING DIAGRAM (RHD) ......................................................................................... 11B – 17
WIRING DIAGRAM (Super Lock).............................................................................. 11B – 18
WIRING DIAGRAM (Super Lock).............................................................................. 11B – 19
WIRING DIAGRAM (Super Lock).............................................................................. 11B – 20
Antitheft control unit (A) .......................................................................................... 11B – 21

ANTITHEFT SYSTEM 11B – 3
Service Precaution
WARNING:
THIS VEHICLE HAS A SUPPLEMENTAL RESTRAINT SYSTEM (SRS). REFER TO THE SRS COMPONENT AND
WIRING LOCATION VIEW IN ORDER TO DETERMINE WHETHER YOU ARE PERFORMING SERVICE ON OR
NEAR THE SRS COMPONENTS OR THE SRS WIRING. WHEN YOU ARE PERFORMING SERVICE ON OR
NEAR THE SRS COMPONENTS OR THE SRS WIRING, REFER TO THE SRS SERVICE INFORMATION.
FAILURE TO FOLLOW WARNINGS COULD RESULT IN POSSIBLE AIR BAG DEPLOYMENT, PERSONAL
INJURY, OR OTHERWISE UNNEEDED SRS SYSTEM REPAIRS.
CAUTION:
Always use the correct fastener in the proper location. When you replace a fastener, use ONLY the exact
part number for that application. ISUZU will call out those fasteners that require a replacement after
removal. ISUZU will also call out the fasteners that require thread lockers or thread sealant. UNLESS
OTHERWISE SPECIFIED, do not use supplemental coatings (Paints, greases, or other corrosion inhibitors)
on threaded fasteners or fastener joint interfaces. Generally, such coatings adversely affect the fastener
torque and the joint clamping force, and may damage the fastener. When you install fasteners, use the
correct tightening sequence and specifications. Following these instructions can help you avoid damage
to parts and systems.
DTC20 Broken wire to door lock actuators ............................................................ 11B – 42
DTC21 Remote key 1 with random code out of capture range ............................ 11B – 43
DTC22 Remote key 2 with random code out of capture range ............................ 11B – 44
DTC23 Remote key 3 with random code out of capture range ............................ 11B – 45
DTC24 Remote key 4 with random code out of capture range ............................ 11B – 46
DTC25 Remote key 5 with random code out of capture range ............................ 11B – 47
DTC28 Input immobiliser short circuit to ground .................................................. 11B – 48
DTC29 Broken wire to immobiliser ......................................................................... 11B – 49
DTC31 Actuator driver door defect ......................................................................... 11B – 50
DTC32 Actuator passenger door defect .................................................................. 11B – 51
DTC36 Broken wire to driver door........................................................................... 11B – 52
DTC37 Broken wire to passenger door ................................................................... 11B – 53
DTC41 Driver door micro switch unlock defect ..................................................... 11B – 54
DTC42 Driver door micro switch lock defect .......................................................... 11B – 55
DTC43 Driver door micro switch dead lock defect ................................................ 11B – 56
DTC44 Passenger door micro switch lock defect................................................... 11B – 57
DTC45 Passenger door micro switch unlock defect .............................................. 11B – 58
DTC47 Battery voltage for door lock actuators is missing ................................... 11B – 59
DTC50 A/D converter defect or battery voltage less than 9 volt ......................... 11B – 60
DTC51 E E P ROM defect .......................................................................................... 11B – 61
DTC52 E E P ROM not programmed by ISUZU ...................................................... 11B – 62
DTC55 Control unit defect ........................................................................................ 11B – 63
DTC123 Output flasher short circuit to grpund or broken wire ........................... 11B – 64
DTC125 Output alarm horn broken wire ................................................................ 11B – 65

ANTITHEFT SYSTEM 11B – 7
DIAGRAMS AND SCHEMATICS
SYSTEM WIRING DIAGRAMS
M
M
M
M
M
M
M
M
- +
ANTITHEFT CONTROL UNIT BATTERY
(12V)
80A10A
ACC Ignition switch20A
10A
10A
antitheft horn
power supply
power supply
door lock motors
hazard relay(RH)
flashers(RH)
hazard relay(LH)
flashers(LH)
status LED
immobilizer controller
daiagnostc conector
groundlock lock
locklock lock alarm trigger
super lock
unlock unlock
(unlock)
(unlock)
unlock
driver door rear door(LH) rear door(RH)rear door(LH) rear door(RH)
assist door driver door assist doordriver door
assist door
driver door assist door
engine hood contact switch
door contact switch
auto door lock switch auto door lock
door lock cylinder
disarmwith super
lock without
super lock

11B – 10 ANTITHEFT SYSTEM
RTW48AXF025301
B
C
Horn
switch
B-71IG1&IG2
H-27 B-55
B-56
B-62
B-63
C-108
H-6B-65
Antenna
cable
B-52H-13
H-25
B-58
B-80(RH)
B-81(LH)
H-26
H-10
H-24
B-44B-43
B-73
H-7
RTW48AXF025301
WIRING DIAGRAM (LHD)

11B – 22 ANTITHEFT SYSTEM
Pin-Assignment
No. Pin Assignment 28 PIN
1 Contact switch driver door
2 Contact switch doors
3—
4 Power supply antitheft
5 horn
6 Contact switch engine compartment
7 Diagnosis
8—
9—
10 —
11 Status LED
12 —
13 —
14 —
15 Lock driver side door lock cylinder
16 Unlock driver side door lock cylinder
17 —
18 Micro Switch, lock / unlock door lock motor
19 —
20 —
21 —
22 —
23 —
24 —
25 —
26 —
27 —
28 Flasher control
No. Pin Assignment 12 PIN
1—
2—
3 Key in
4—
5—
6 Micro Switch, unlock, auto door lock
7 Lock, locking motors
8 Unlock, locking motors
9 Power supply locking motors
10 —
11 Ground
12 —

ANTITHEFT SYSTEM 11B – 25
Tech-2 Features
1. Tech-2 is a 12volt system. Do not apply 24
volts.
2. After connecting and/or installing the vehicle
communication interface (VCI) module, PCMCIA
card and data link connector (DLC) to the Tech-
2, connect the tool to the vehicle DLC.
3. Make sure the tech-2 is OFF when removing or
installing the PCMCIA card.
4. The Tech-2 has the capability of two or three
snapshot.
5. The PCMCIA card is sensitive to magnetism and
static electricity, so care should be taken in the
handling of the card.
6. Always return to the Main Menu by pressing
the EXIT key several times before shutting
down.
7. To clear diagnostic trouble codes (DTCs), open
Application Menu and press “Clear DTC”.
Getting Started
Before operating the Isuzu PCMCIA card with the
Tech-2, the following steps must be performed:
1. The Isuzu System PCMCIA card inserts into the
Tech-2.
2. Connect the SAE 16/19 adapter to the DLC
cable.
3. Connect the DLC cable to the Tech-2.
4. Mark sure the vehicle ignition is off.
5. Connect the Tech-2 SAE 16/19 adapter to the
vehicle DLC.
6. Turn the vehicle ignition (key) switch.
7. Power the Tech-2 ON and verify the Tech-2
power up display.
8 7 6 5 4 3 2 1
16 15 14 13 12 11 10 9
060R300015
Press (ENTER) To Continue
060RW009