Code No. B1081 Control panel data error
















DIAGNOSIS CODE SET CONDITIONS




PROBABLE CAUSES



  • A/C control unit
  • Malfunction of the A/C-ECU
  • Damaged harness wires and connectors

DIAGNOSIS PROCEDURE


STEP 1. Connector check: C-101 A/C control unit connector and B-16 A/C-ECU connector


Q. Is the check result normal?

Go to Step 2.
Repair the damaged connector.

STEP 2. Check the wiring harness between C-101 A/C control unit connector terminal No. 9, 10 and B-16 A/C-ECU connector terminal No. 15, 16.



  • Check the input line for open or short circuit.

Q. Is the check result normal?

Go to Step 3.
Repair the wiring harness.

STEP 3. Measure the voltage at B-16 A/C-ECU connector.


(1)Disconnect the connector, and measure at the wiring harness side.
(2)Electric motor switch: ON
(3)Voltage between terminal No. 8 and body earth
OK: Battery voltage

Q. Is the check result normal?

Go to Step 5.
Go to Step 4.

STEP 4. Check the wiring harness between B-16 A/C-ECU connector terminal No. 8 and the fusible link (25).



  • Check the power supply line for open circuit.
note Before checking the wiring harness, check the junction block connectors B-310, B-301, joint connectors B-05, and B-06, and repair them if necessary.

Q. Is the check result normal?

Intermittent malfunction. Refer to GROUP 00 - How to Use Troubleshooting/Inspection Service Points, - How to Cope with Intermittent Malfunctions .)
Repair the wiring harness.

STEP 5. Measure the voltage at B-16 A/C-ECU connector.


(1)Disconnect the connector, and measure at the wiring harness side.
(2)Electric motor switch: ON
(3)Voltage between terminal No. 10 and body earth
OK: Battery voltage

Q. Is the check result normal?

Go to Step 8.
Go to Step 6.

STEP 6. Connector check: B-309 A/C relay connector


Q. Is the check result normal?

Go to Step 7.
Repair the damaged connector.

STEP 7. Check the wiring harness between B-16 A/C-ECU connector terminal No. 10 and A/C relay connector terminal No. 3.



  • Check the power supply line for open circuit.
note Before checking the wiring harness, check the junction block connectors B-302 and B-301, and repair them if necessary.

Q. Is the check result normal?

Intermittent malfunction. Refer to GROUP 00 - How to Use Troubleshooting/Inspection Service Points, - How to Cope with Intermittent Malfunctions .)
Repair the wiring harness.

STEP 8. Check whether the diagnosis code is reset.


Q. Is the diagnosis code set?

Go to Step 9.
Intermittent malfunction. Refer to GROUP 00 - How to Use Troubleshooting/Inspection Service Points, - How to Cope with Intermittent Malfunctions .)

STEP 9. After replacing the A/C control unit check again if the diagnosis code is set.


Q. Is the diagnosis code set?

Replace the A/C-ECU.
Intermittent malfunction. Refer to GROUP 00 - How to Use Troubleshooting/Inspection Service Points, - How to Cope with Intermittent Malfunctions .)