Inspection Procedure 2: Heater does not work at all, heater does not work quickly.

PROBABLE CAUSES

Damaged harness wires and connectors
User’s incorrect operation
Limitation due to main battery remaining capacity
Insufficient volume of water heater fluid
Malfunction of the A/C-ECU
Malfunction of A/C control unit

DIAGNOSIS PROCEDURE

STEP 1. Check the main battery remaining capacity.

Q. Is the check result normal?

	Go to Step 2.

	Charge the main battery.

STEP 2. Check the water heater fluid volume.

Q. Is the check result normal?

	Go to Step 3.

	Make the water heater fluid volume adequate.

STEP 3. A/C-ECU M.U.T.-III service data

Check that the following service data MUT-III display contents are normal.

Item 23: Temperature adjustment dial position
Item 69: Blower motor (target value)

Q. Is the check result normal?

	Go to Step 4.

	Replace the A/C-ECU.

STEP 4. A/C-ECU M.U.T.-III actuator test

Check the operations with the actuator test.

Item 88: Temperature adjustment dial position

Q. Is the check result normal?

	Go to Step 5.

	Replace the A/C-ECU.

STEP 5. Connector check: A-113 heater connector, C-101, C-115 A/C control unit connector

Q. Is the check result normal?

	Go to Step 6.

	Repair the damaged connector.

STEP 6. Check the wiring harness between A-113 heater connector terminal connector terminal No. 6, 7, 8, 1, 2, 3, 4, 5 and C-101 A/C control unit connector terminal No. 19, 17, 18, C-113 A/C control unit connector terminal No. 25, 33, 34, 35, 36.

Check the input line for open circuit.

note

Before checking the wiring harness, check the intermediate connector B-01 and repair it if necessary.

Q. Is the check result normal?

	Go to Step 7.

	Repair the wiring harness.

STEP 7. Check the high-voltage connector and wiring harness.

danger

Carry out the check on the high-voltage circuit while reading carefully the precautions on handling a high-voltage vehicle. Refer to .

danger

Wear the specified protection equipment during the check.

1.Shut down the high voltage. Refer to .
2.Check the following terminal (bolt).

G-20 heater high-voltage terminal (bolt)

3.Check the following wiring harnesses for short circuit.

Between the high-voltage harnesses
Between the high-voltage harness and earth

Q. Is the check result normal?

	Go to Step 8.

	Replace the wiring harness assembly.

STEP 8. After replacing the heater, check again that the heater works normally.

Q. Is the check result normal?

	This diagnosis is complete.

	Go to Step 9.

STEP 9. After replacing the A/C-ECU, check again that the heater works normally.

Q. Is the check result normal?

	This diagnosis is complete.

	Replace the compressor & heater controller. Check the trouble symptom again, and if it does not work correctly, return to step 1.

MMC-Manuals.ru