Isuzu N-Series. Manual - part 292

HSA (HILL START AID) 5A5-47

Symptom: HSA Indicator Lamp Does not Go Off (HSA Released)

Step

Action

Value

YES

NO

1

Does the HSA indicator lamp go off, when the
connector of the HSA control unit is discon-
nected?

—

Go to Step2

Go to Step3

2

Replace the HSA control unit.

Is the repair completed?

—

Go to Step4

Go to Step2

3

Repair the short circuit in the harness
between 2 “B-52” (meter) and 12 “B-285”
(control unit).

Is the repair completed?

—

Go to Step4

Go to Step3

4

After HSA repair, make sure no trouble is
found during self-diagnosis.

Is this step completed?

—

—

—

N5A3033E

5A5-48 HSA (HILL START AID)

Symptom: Buzzer Does not Operate Though the Door Is Opened While HSA Operating

Step

Action

Value

YES

NO

1

Is the continuity (resistance) of the diode box
normal?

—

Go to Step2

Go to Step3

2

Measure the voltage between the HSA control
unit connector terminal 1 “B-285” and the
body ground (connector disconnected) when
the door opened. Also, measure the battery
voltage when the door closed. Are the mea-
surements completed?

Body ground 

voltage less 

than 3V

Battery volt-

age 20 V or 

more

Go to Step4

Go to Step5

3

Replace the diode box.

Is the repair completed?

—

Go to Step4

Go to Step3

4

Replace the HSA control unit.

Is the repair completed?

—

Go to Step8

Go to Step4

5

Is the continuity (resistance) of the door
switch normal?

—

Go to Step6

Go to Step6

6

Check the door switch circuit for open circuit,
and the connector for improper connection.

Is the repair completed?

—

Go to Step8

Go to Step6

7

Repair or replace the door switch.

Is the repair completed?

—

Go to Step8

Go to Step6

8

After HSA repair, make sure no trouble is
found during self-diagnosis.

Is this step completed?

—

—

Go to Step8

HSA (HILL START AID) 5A5-49

N5A3034E

5A5-50 HSA (HILL START AID)

Symptom: HSA Indicator Lamp Blinks Abnormally and Does not Output the Trouble Cord
During Self-diagnosis

Step

Action

Value

YES

NO

1

Does the parking brake lamp (meter) come on
when the parking brake is applied?

—

Go to Step2

Go to Step3

2

Replace the HSA control unit.

Is the repair completed?

—

Go to Step6

Go to Step2

3

Is the continuity (resistance) of the parking
brake switch normal?

—

Go to Step4

Go to Step5

4

Repair the improper connection or open circuit
between 5 “B-51” (meter) and 1 “N-6”.

Is the repair completed?

—

Go to Step6

Go to Step4

5

Repair or replace the parking brake switch.

Is the repair completed?

—

Go to Step6

Go to Step5

6

After HSA repair, make sure no trouble is
found during self-diagnosis.

Is this step completed?

—

—

Go to Step6