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HAIMA 7 Service Manual(MT)-U Heater and air conditioning system

Troubleshooting Step

Troubleshooting Step Inspection Action *12 Inspect continuity of wiring harness between rear climate control unit and air mix actuator. • Is there continuity between the following terminals of rear climate control connector and terminals (motor driving signal) of air mix actuator? — Terminal a — Terminal g — Terminal b — Terminal f *13 Inspect wiring harness between rear climate control unit and air mix actuator to determine whether it is short to ground. • Is there continuity between following terminals of rear climate control unit and ground? — Terminal a — Terminal b *14 Inspect wiring harness between rear climate control unit and air mix actuator to determine whether it is short to b+ (positive battery voltage) • Turn ignition switch to on position. • Measure wiring harness side voltage of following air mix connectors. — Terminal a — Terminal g — Terminal b — Terminal f • Is voltage approximately equivalent to b+ (positive battery voltage)? 15 Inspect air mix actuator of rear a/c unit. • Remove the actuator. • Inspect air mix links and rockers of rear a/c unit. — Is there grease on links and rockers? — Are links and rockers firmly installed at proper position? • Are all above items normal? Yes No Yes No Yes No Yes No Go to next step. Repair wiring harness between rear climate control unit and air mix actuator, go to step 21. Repair wiring harness between rear climate control unit and air mix actuator, go to step 21. Go to next step. Repair wiring harness between rear climate control unit and air mix actuator, go to step 21. Go to next step. Go to next step. Apply grease or install links and rockers firmly at proper positions, go to step 21. U-30

Troubleshotting Step Inspection Action 16 Verify whether malfunction is in air mix actuator or elsewhere. • Turn ignition switch to on position. • Set rear main fan switch at 3rd position. • Does temperature of air blown out change easily with air mix rocker operated manually? 17 Inspect air mix actuator. • Inspect air mix actuator. (see u-30, air mix actuator inspection) • Is it normal? 18 Inspect rear a/c unit • Is rear a/c unit air mix control valve clogged with foreign material? Yes Go to next step. No Go to step 18. Yes Go to next step. No Replace air mix actuator, go to step 21. Yes Remove obstruction, go to step 21. No Go to next step. 19 Inspect rear a/c unit’s air mix control valve. • Inspect rear a/c unit’s air mix control valve for the following items. — Is there any damage or crack with the air mix control valve? — Is air mix control valve firmly installed at proper position? • Are all above items normal? 20 Inspect heater pipeline • Inspect heater pipeline for the following items. — Is there any damage or crack with the heater pipeline? — Is there any coolant leakage with the heater pipeline joints? — Is there loose with the heater pipeline joints? — Is there any leakage with connection between the heater pipeline and the rear a/c unit? • Are all above items normal? Yes No Yes No Go to next step. Replace air mixing control valve or install it in proper position firmly, go to step 21. Replace rear climate control unit and turn to next step. If the heater pipeline is loose, tighten to specified torque. Repair or replace heater pipeline, go to next step. 21 Verify whether malfunction symptom occurs after repair. • Does rear climate control unit operate well at different temperature? Yes Troubleshooting completed. Explain causes to customer. No Recheck malfunction symptoms, repeat from step 1 if malfunction reoccurs. U-31

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