Inspection Procedure
20: The PTC heater (Rear floor console side) does not work <Short
wheelbase option>
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COMMENTS ON TROUBLE SYMPTOM
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When the PTC heater does not work under the
following conditions, the PTC heater circuit
system may be defective.
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PTC heater operating conditions
- Rear fan switch: ON
- Rear A/C switch Temperature control dial: MAX HOT
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- Damaged the wiring harness or connectors
- Malfunction of the PTC heater relay
- Malfunction of the PTC heater
- Malfunction of the rear A/C switch
- Malfunction of the automatic A/C control panel
(A/C-ECU)
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STEP 1. Connector check: E-26-5 PTC heater 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 connector.
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STEP 2. Resistance measurement at the E-26-5 PTC heater
connector.
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(1)Disconnect the connector, and measure at the wiring
harness side.
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(2)Continuity between terminal 1 and body
earth
OK: Continuity (Less than 2 Ω)
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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 E-26-5 PTC heater connector
terminal No.1 and body earth.
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- Check the PTC heater 2 earth line for open circuit.
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Q.
Is the check result normal?
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The
trouble can be an intermittent malfunction (Refer to GROUP 00, How to Cope
with Intermittent Malfunction  ).
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Repair
the wiring harness.
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STEP 4. Connector check: E-25 rear A/C switch connector
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Q.
Is the check result normal?
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Go to Step 5.
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Repair
the connector.
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STEP 5. Voltage measurement at E-26-5 PTC heater
connector.
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(1)Disconnect the connector, and measure at the wiring
harness side.
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(2)Turn the ignition switch to the "ON" position.
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(3)Disconnect rear A/C switch connector E-25 and earth
terminal 14.
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(4)Voltage between terminal 2 and body
earth.
OK: System voltage
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Q.
Is the check result normal?
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Go to Step 14.
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Go to Step 6.
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STEP 6. Connector check: E-26-4 PTC heater 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 connector.
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STEP 7. Check the PTC heater relay continuity.
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Refer to .
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Q.
Is the PTC heater relay in good condition?
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Go to Step 8.
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Replace the PTC heater relay.
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STEP 8. Voltage measurement at E-26-4 PTC heater relay
connector.
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(1)Remove the relay, and measure at the harness
side.
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(2)Voltage between terminal 2 and body
earth.
OK: System voltage
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Q.
Is the check result normal?
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Go to Step 10.
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Go to Step 9.
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STEP 9. Check the wiring harness between E-26-4 PTC heater relay
connector
terminal No.2 and the fusible link (1).
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| note |
Prior to the wiring harness inspection, check
intermediate connectors D-238, D-220 and
E-26, and repair if necessary.
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- Check the PTC heater relay power supply line for open
circuit.
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Q.
Is the check result normal?
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The
trouble can be an intermittent malfunction (Refer to GROUP 00, How to Cope
with Intermittent Malfunction ).
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Repair
the wiring harness.
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STEP 10. Voltage measurement at E-26-4 PTC heater relay
connector.
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(1)Remove the relay, and measure at the harness
side.
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(2)Turn the ignition switch to the "ON" position.
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(3)Turn the rear fan switch to the "ON" position.
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(4)Turn the MAX HOT switch to the "ON" position. <rear
A/C switch>
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(5)Voltage between terminal 5 and body
earth.
OK: System voltage
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Q.
Is the check result normal?
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Go to Step 12.
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Go to Step 11.
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STEP 11. Check the wiring harness between E-26-4 PTC heater relay
connector terminal No.5 and E-26 rear heater terminal No.5.
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| note |
Prior to the wiring harness inspection, check fuse
connector E-26-2, and repair if necessary.
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- Check the PTC heater relay power supply line for open
circuit.
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Q.
Is the check result normal?
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The
trouble can be an intermittent malfunction (Refer to GROUP 00, How to Cope
with Intermittent Malfunction ).
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Repair
the wiring harness.
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STEP 12. Check the wiring harness between E-26-4 PTC heater relay
connector terminal No.1 and E-26-5 PTC heater connector terminal
No.2.
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- Check the PTC heater relay power supply line for open
circuit.
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Q.
Is the check result normal?
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Go to Step 13.
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Repair
the wiring harness.
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STEP 13. Check the wiring harness between E-26-4 PTC heater relay
connector terminal No.3 and E-25 rear A/C switch connector terminal
No.14.
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| note |
Prior to the wiring harness inspection, check rear
heater connector E-26, and repair if
necessary.
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- Check the rear A/C switch power supply line for open circuit.
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Q.
Is the check result normal?
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The
trouble can be an intermittent malfunction (Refer to GROUP 00, How to Cope
with Intermittent Malfunction ).
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Repair
the wiring harness.
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STEP 14. Resistance measurement at the E-25 rear A/C switch
connector.
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(1)Disconnect the connector, and measure at the wiring
harness side.
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(2)Continuity between terminal 3 and body
earth
OK: Continuity (Less than 2 Ω)
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Q.
Is the check result normal?
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Go to Step 16.
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Go to Step 15.
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STEP 15. Check the wiring harness between E-25 rear A/C switch
connector
terminal No.3 and body earth.
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- Check the rear A/C switch earth line for open circuit.
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Q.
Is the check result normal?
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The
trouble can be an intermittent malfunction (Refer to GROUP 00, How to Cope
with Intermittent Malfunction ).
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Repair
the wiring harness.
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STEP 16. Check the PTC heater.
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Refer to .
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Q.
Is the PTC heater in good condition?
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Go to Step 17.
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Replace the PTC heater.
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STEP 17. Check the rear A/C switch.
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Refer to .
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Q.
Is the PTC heater in good condition?
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The
trouble can be an intermittent malfunction (Refer to GROUP 00, How to Cope
with Intermittent Malfunction ).
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Replace the rear A/C switch.
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