Code No. B1081
Control panel data error
DIAGNOSIS CODE SET CONDITIONS
This code is set when the signal from A/C-ECU cannot be received
for 5 seconds or more.
PROBABLE CAUSES
- A/C control unit
- Malfunction of the A/C-ECU
- Damaged harness wires and connectors
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STEP 1. Connector check: C-101 A/C control unit connector
and B-16 A/C-ECU connector
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Q.
Is the check result normal?
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 Go to Step 2.
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 Repair the damaged connector.
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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.
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- Check the input line for open or short circuit.
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Q.
Is the check result normal?
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Go to Step 3.
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Repair the wiring harness.
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STEP 3. Measure the voltage at B-16 A/C-ECU connector.
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(1)Disconnect the connector, and measure at the wiring harness side.
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(2)Electric motor switch: ON
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(3)Voltage between terminal No. 8 and body earth
OK: Battery voltage
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Q.
Is the check result normal?
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Go to Step 5.
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Go to Step 4.
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STEP 4. Check the wiring harness between B-16 A/C-ECU connector
terminal No. 8 and the fusible link (25).
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- Check the power supply line for open circuit.
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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.
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Q.
Is the check result normal?
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Intermittent malfunction. Refer to GROUP 00 - How to
Use Troubleshooting/Inspection Service Points, - How to Cope with Intermittent Malfunctions  .)
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Repair the wiring harness.
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STEP 5. Measure the voltage at B-16 A/C-ECU connector.
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(1)Disconnect the connector, and measure at the wiring harness side.
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(2)Electric motor switch: ON
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(3)Voltage between terminal No. 10 and body earth
OK: Battery voltage
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Q.
Is the check result normal?
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Go to Step 8.
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Go to Step 6.
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STEP 6. Connector check: B-309 A/C relay connector
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Q.
Is the check result normal?
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Go to Step 7.
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Repair the damaged connector.
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STEP 7. Check the wiring harness between B-16 A/C-ECU connector
terminal No. 10 and A/C relay connector terminal No. 3.
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- Check the power supply line for open circuit.
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Before checking the wiring harness, check the junction block connectors
B-302 and B-301, and repair them if necessary.
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Q.
Is the check result normal?
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Intermittent malfunction. Refer to GROUP 00 - How to
Use Troubleshooting/Inspection Service Points, - How to Cope with Intermittent Malfunctions .)
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Repair the wiring harness.
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STEP 8. Check whether the diagnosis code is reset.
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Q.
Is the diagnosis code set?
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Go to Step 9.
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Intermittent malfunction. Refer to GROUP 00 - How to
Use Troubleshooting/Inspection Service Points, - How to Cope with Intermittent Malfunctions .)
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STEP 9. After replacing the A/C control unit check again if the diagnosis
code is set.
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Q.
Is the diagnosis code set?
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Replace the A/C-ECU.
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Intermittent malfunction. Refer to GROUP 00 - How to
Use Troubleshooting/Inspection Service Points, - How to Cope with Intermittent Malfunctions .)
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