Inspection Procedure
7: A/C control unit power supply system
PROBABLE CAUSES
- Malfunction of compressor & heater controller
- Damaged harness wires and connectors
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STEP 1. Connector check: C-101 A/C control unit 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. Measure the voltage at C-101 A/C control unit connector.
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(1)Disconnect the connector, and measure at the wiring harness side.
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(2)Voltage between terminal No. 13 and body earth
OK: Battery voltage
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Q.
Is the check result normal?
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Go to Step 4.
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Go to Step 3.
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STEP 3. Check the wiring harness between C-101 A/C control unit connector
terminal No. 13 and the fusible link (25).
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- Check the power supply line for open circuit.
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| note |
Before checking the wiring harness, check the junction block connectors 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 4. Measure the voltage at B-101 A/C control unit connector.
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(1)Disconnect the connector, and measure at the wiring harness side.
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(2)Voltage between terminal No. 15 and body earth
OK: Battery voltage
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Q.
Is the check result normal?
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Go to Step 6.
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Go to Step 5.
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STEP 5. Check the wiring harness between C-101 A/C control unit connector
terminal No. 15 and B-309 A/C relay connector terminal No. 3.
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- Check the power supply line for open circuit.
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| note |
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 6. Measure the resistance at C-101 A/C control unit connector.
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(1)Disconnect the connector, and measure at the wiring harness side.
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(2)Resistance between terminal No. 14 and body earth
OK: Continuity exists (2 Ω or less)
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Q.
Is the check result normal?
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Replace the compressor & heater controller.
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Go to Step 7 <LHD>.
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Go to Step 8 <RHD>.
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STEP 7. Check the wiring harness between B-315 A/C control unit connector
terminal No. 14 and earth connector terminal No. 1.
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- Check the earth wires for open circuit.
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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 the wiring harness between B-315 A/C control unit connector
terminal No. 14 and the body earth.
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- Check the earth wires for open circuit.
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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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