Isuzu KB P190. Manual — part 1369

8A-538 ELECTRICAL-BODY AND CHASSIS

TROUBLESHOOTING

Diagnostic procedure

• Check the operation "Lock / unlock" by using

transmitter (remote key) on the vehicle.

• Check the operation "ON / OFF" for Driver side

door SW on the vehicle.

• Perform the Keyless entry System Check.

Diagnostic Aids

An intermittent may be caused by the following:

• Poor connections.
• Miss routed harness.
• Rubbed through wire insulation.
• Broken wire inside the insulation.

Check for the following conditions:

• Poor connection at keyless entry control unit-

Inspect harness connectors for backed out

terminals, improper mating, broken locks,

improperly formed or damaged terminals, and poor

terminal to wire connection.

• Damaged harness-Inspect the wiring harness for

damage.

Check the Electro-Magnetic Interference (EMI)

• Location of vehicle check

Move the vehicle to a new location and perform

the check again.

• Non-OEM Parts.

Switch is “OFF” or remove the Non-OEM parts and

perform the check again.

• Other

Remove the accessory and another key from key.

Check the other items.

• Battery voltage is low.
• Keyless entry programming functions.
• Registration for security code.
• Ignition switch operation.
• Meter system is malfunction.

Check the operation

Check the operation "Lock / unlock" by using

transmitter (remote key) on the vehicle.

Notice

If so equipped the Anti Theft, Refer to ANTI

THEFT SYSTEM in 11B Section.

ELECTRICAL-BODY AND CHASSIS 8A-539

Keyless Entry System Check

Step Action Value

(s)

Yes

No

1

Check the fuse for the keyless entry power feed
circuit. (EB16 10A)

If a problem found, repair as necessary.

Was the problem found?

—

Verify repair

Go to Step 2

2

1. Check the KCU (Keyless Entry Control Unit)

ground circuit for an open, or short to voltage.

Also, check the KCU ignition feed circuit for an

open or short to ground and the KCU ground

circuit for an open.

2. If a problem is found, repair as necessary.
Was the problem found?

—

Verify repair

Go to Step 3

3

1. Check the front drive side SW circuit for an open,

or short to voltage.

2. If a problem is found, repair as necessary.
Was the problem found?

—

Verify repair

Go to Step 4

4

1. Check the operation "Lock / unlock" by using

transmitter (Remote key) on the vehicle.

Was the problem found?

—

Go to

Diagnostic

Chart

Go to

Diagnostic

Aids

8A-540 ELECTRICAL-BODY AND CHASSIS

ID Code not yet programmed

Step Action Value

(s)

Yes

No

1

Was the Keyless entry System Check performed?

— Go

to

Step 2

Go to Keyless

entry

System Check

2

Check the key.

Is a key peculiar to a vehicle?

—

Go to Step 3

Refer to

Diagnostic Aids

3

Check the Keyless entry programming functions.
• All transmitters (Remote Key).
If a problem is found, reprogramming as necessary.

(Refer to “ID code new registration”)

Was the action complete?

—

Go to Step 4

Go to ID code

new registration

4

Check the operation "Lock / unlock" by using
transmitter (Remote key) on the vehicle.

Was the problem found?

—

Go to Step 5 Verify

repair

5

Recheck the following condition.

1. Non-OEM parts switch is “OFF” or remove the

Non-OEM parts.

2. Move the vehicle to a new location.

3. Check the operation "Lock / unlock" by using

transmitter (Remote key) on the vehicle.

Was the problem found?

—

Go to Step 6 Verify

repair

6

Replace the Keyless entry control unit (KCU).

IMPORTANT: The replacement KCU must be
programmed the security code.

Was the problem found?

—

Go to Step 7 Verify

repair

7

Replace the key and lock cylinder assembly with
Keyless entry system (KCU ).

IMPORTANT:
• KCU is not replacing simultaneously.
• After replace lock cylinders, perform the following

below the items.

• Replace the keys and key cylinders.
• Program the Keyless entry system.

(Refer to “ID code new registration”)

Was the action complete?

—

Verify repair

—

ELECTRICAL-BODY AND CHASSIS 8A-541

No Remote Key Programmed

Step Action Value

(s)

Yes

No

1

Was the Keyless entry System Check performed?

— Go

to

Step 2

Go to keyless

entry

System Check

2

Check the key.

Is a key peculiar to a vehicle?

—

Go to Step 3

Refer to

Diagnostic Aids

3

Check the keyless entry programming functions.
• Transmitter (Remote Key).
Was a problem found?

—

Go to Step 4 Go

to

Step 5

4

Perform the keyless entry programming functions.
• Transmitter (Remote Key).
(Refer to “ID code new registration”)

Was the action complete?

—

Go to Step 5 —

5

Replace the transmitter (Remote Key).

IMPORTANT: The replacement transmitter (Remote
Key) must be programmed the ID code.

Was the action complete?

—

Verify repair

—

Door Lock Actuators Short Circuit to Ground

Step Action Value

(s)

Yes

No

1

Was the Keyless entry System Check performed?

— Go

to

Step 2

Go to keyless

entry

System Check

2

Check the door lock actuators circuit.

1. Ignition key position is “OFF”.

2. Disconnect the keyless entry control unit (KCU).

3. Check the door lock actuator circuit for short to

ground.

If the problem found, repair as necessary.

Was a problem found?

—

Verify repair

Go to Step 3

3

Check the operation "Lock / unlock" by using
transmitter (Remote key) on the vehicle.

Was the problem found?

—

Go to Step 4 Verify

repair

4

Check the door lock actuator.

If the problem found, repair as necessary.

Was a problem found?

—

Verify repair

Go to Step 5

5

Replace the Keyless entry control unit (KCU).

IMPORTANT: The replacement KCU must be
programmed the security code.

Was the problem found?

—

Go to Step 7 Verify

repair