Isuzu Trooper (2000 year). Manual - part 38

HEATING, VENTILATION AND AIR CONDITIONING (HVAC) 1A–121

Inspection of the Mode Actuator System

D08RY00146

Condition

Possible cause

Correction

Does not work at all

—

Refer to Chart A

Control failure

—

Refer to Chart B

1A–122 HEATING, VENTILATION AND AIR CONDITIONING (HVAC)

Chart A: Does Not Work At All 

Step

Action

Value(s)

Yes

No

1

1. Turn on the ignition switch (the engine is run).
2. Disconnect the mode actuator connector (B–69)
3. Select VENT pressing the mode actuator.

Is the battery voltage provided on a regular interval
between the harness side connector terminal
No.B69–1 (+) and No.B69–5 (-)?

—

Go to Step 3

Go to Step 2

2

Replace the auto air conditioner control unit.

Is the action complete?

—

Varify repair

—

3

Turn on the DEF mode switch.

Is the battery voltage provided on a regular interval
between the chassis side connector terminal
No.B69–5 (+) and No.B69–1 (-)?

—

Go to Step 5

Go to Step 4

4

Replace the auto air conditioner control unit.

—

Varify repair

—

5

Is there continuity between the harness side connector
terminal No.B69–1 and No.I32–4?

—

Go to Step 7

Go to Step 6

6

Repair an open circuit between terminal No.B69–1 and
No.I32–4.

Is the action complete?

—

Go to Step 5

—

7

Is there continuity between the harness side connector
terminal No.B69–5 and No.I32–3?

—

Go to Step 9

Go to Step 8

8

Repair an open circuit between terminal No.B69–5 and
No.I32–3.

Is the action complete?

—

Verify repair

—

9

Replace the mode actuator.

—

Verify repair

—

HEATING, VENTILATION AND AIR CONDITIONING (HVAC) 1A–123

Chart B: Mode Actuator Control Failure 

Step

Action

Value(s)

Yes

No

1

Turn on the ignition switch (the engine is run).

Dose the mode actuator fully stroke when the defrost
mode and the vent mode are selected?

—

Go to Step 3

Go to Step 2

2

Repair or replace the mode door or the link unit.

Is the action complete?

—

Go to Step 1

—

3

Is there continuity between the harness side connector
terminal No.B69–9 and No.I33–11?

—

Go to Step 5

Go to Step 4

4

Repair an open circuit between terminal No.B69–9 and
No.I33–11.

Is the action complete?

—

Go to Step 3

—

5

Is there continuity between the harness side connector
terminal No.B69–3 and No.I33–10?

—

Go to Step 7

Go to Step 6

6

Repair an open circuit between terminal No.B69–3 and
No.I33–10.

Is the action complete?

—

Go to Step 5

—

7

Is there continuity between harness side connector
terminal No.B69–4 and No.I33–8?

—

Go to Step 9

Go to Step 8

8

Repair an open circuit between terminal No.B69–4 and
No.I33–8.

Is the action complete?

—

Go to Step 7

—

9

Is sum of the voltage between the following harness
side connector terminal approximately 5V?  Voltage
between No.I33–8 and No.I33–10 plus voltage
between No.I33–8 and No.I33–11

5V

Go to Step 11

Go to Step 10

10

Replace the actuator.

Is the action complete?

—

Verify repair

—

11

Dose the mode actuator work normally through manual
operation?

—

Go to Step 13

Go to Step 12

12

Replace the sensor.

Is the action complete?

—

Verify repair

—

13

Replace the auto air conditioner control unit.

Is the action complete?

—

Verify repair

—

1A–124 HEATING, VENTILATION AND AIR CONDITIONING (HVAC)

Inspection of the Fan Motor System

D08RY00144