Inspection Procedure 17: Rear blower does not work <vehicles with dual automatic A/C>

COMMENTS ON TROUBLE SYMPTOM

If the rear blower motor does not operate, the rear blower motor circuit system may be defective.

PROBABLE CAUSES

Malfunction of rear blower relay
Malfunction of rear blower motor
Malfunction of rear power transistor
Malfunction of the A/C-ECU
Damaged harness wires and connectors

DIAGNOSIS PROCEDURE

STEP 1. M.U.T.-III diagnosis code

Check whether the air conditioner sets a diagnosis code or not.

Q. Is the check result normal?

	Go to Step 2.

	Refer to diagnosis code chart .

STEP 2. M.U.T.-III actuator test

Check that the following actuator test can be executed normally. (Refer to

Item 04: Rear blower fan: OFF
Item 05: Rear blower fan: AUTO <vehicles with dual automatic A/C>
Item 06: Rear blower fan: Lo
Item 07: Rear blower fan: Middle
Item 08: Rear blower fan: High

Q. Does the rear blower motor work normally?

	Go to Step 3.

	Go to Step 9.

STEP 3. M.U.T.-III data list

Check that the following service data display contents are normal. (Refer to

Item 22: Rear blower fan
Item 23: Rear blower fan (Target)
Item 31: Rear fan SW (Front)
Item 32: Rear control OFF switch
Item 33: Rear control fan OFF switch

Q. Is the check result normal?

	Go to Step 8.

	NO <Item 22, 23, 32, 33 is abnormal> : Go to Step 4.

	NO <Item 31 is abnormal> : Refer to Inspection Procedure 22: Rear fsn switch system <LHD> , Inspection Procedure 23: Rear fsn switch system <RHD (Except vehicles for Hong Kong and Singapore)> or Inspection Procedure 24: Rear fsn switch system <RHD (Vehicles for Hong Kong and Singapore)> .

STEP 4. Connector check: E-03 rear heater controller connector

Q. Is the check result normal?

Go to Step 5.

Repair the connector.

STEP 5. Check the rear heater controller

Refer to

Q. Is the check result normal?

	Go to Step 6.

	Replace the rear heater controller.

STEP 6. Connector check: C-104 A/C-ECU

Q. Is the check result normal?

Go to Step 7.

Repair the connector.

STEP 7. Check the wiring harness between E-03 rear heater controller connector (terminals 4, 5, 6, 7, 8 and 9) and C-104 A/C-ECU connector (terminals 70, 69, 68, 67, 66 and 65).

note

Prior to the wiring harness inspection, check intermediate connector C-128, and repair if necessary.

Check the input line for open circuit.

Q. Is the check result normal?

Go to Step 8.

Repair the wiring harness.

STEP 8. Recheck the trouble symptom

Q. Is the check result normal?

	The trouble can be an intermittent malfunction (Refer to GROUP 00, How to Cope with Intermittent Malfunction ).

	Replace the A/C-ECU.

STEP 9. Connector check: C-215 rear blower relay connector

Q. Is the check result normal?

Go to Step 10.

Repair the connector.

STEP 10. Check the rear blower relay

Refer to

Q. Is the check result normal?

	Refer to Inspection Procedure 25: Rear blower motor power supply system <LHD> , Inspection Procedure 26: Rear blower motor power supply system <RHD (Except vehicles for Hong Kong and Singapore)> or Inspection Procedure 27: Rear blower motor power supply system <RHD (Vehicles for Hong Kong and Singapore)> .

	Replace the rear blower relay.