Isuzu N-Series. Service 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?
—
2
Replace the HSA control unit.
Is the repair completed?
—
3
Repair the short circuit in the harness
between 2 “B-52” (meter) and 12 “B-285”
(control unit).
Is the repair completed?
—
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?
—
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
3
Replace the diode box.
Is the repair completed?
—
4
Replace the HSA control unit.
Is the repair completed?
—
5
Is the continuity (resistance) of the door
switch normal?
—
6
Check the door switch circuit for open circuit,
and the connector for improper connection.
Is the repair completed?
—
7
Repair or replace the door switch.
Is the repair completed?
—
8
After HSA repair, make sure no trouble is
found during self-diagnosis.
Is this step completed?
—
—
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?
—
2
Replace the HSA control unit.
Is the repair completed?
—
3
Is the continuity (resistance) of the parking
brake switch normal?
—
4
Repair the improper connection or open circuit
between 5 “B-51” (meter) and 1 “N-6”.
Is the repair completed?
—
5
Repair or replace the parking brake switch.
Is the repair completed?
—
6
After HSA repair, make sure no trouble is
found during self-diagnosis.
Is this step completed?
—
—
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