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

Troubleshooting

Troubleshooting Troubleshooting procedure Step Inspection Action 1 Inspect coolant temperature • Is coolant warmed up sufficiently? Yes No Go to next step. Warm up engine to normal operation temperature, then go to step 21. *2 Verify whether malfunction is in air mix actuator (+5v signal) system or elsewhere. • Turn ignition switch to on position. • Measure the voltage at terminal c (+5v signal) of air mix actuator. • Is voltage approximately equivalent to +5v? Yes Go to step 6. No Go to next step. *3 Inspect air mix actuator for continuity. • Disconnect air mix actuator connector • Measure the voltage at terminal c (+5v signal) of air mix actuator • Is voltage approximately equivalent to 5v? *4 Inspect continuity of wiring harness between rear climate control unit and air mix actuator. • Turn ignition switch to lock position. • Disconnect rear climate control connector. • Is there continuity between terminal c (+5v signal) of air mix actuator conduct and terminal h of rear climate control unit? *5 Verify whether malfunction is in wiring harness (short circuit to ground between rear climate control unit and air mix actuator) or in rear climate control unit. • Is there continuity between terminal c (+5v signal) of air mix actuator and ground? *6 Inspect continuity of wiring harness between rear climate control unit and air mix actuator. • Turn ignition switch to lock position. • Disconnect connectors of rear climate control unit from air mix actuator. • Is there continuity between terminal f of rear climate control unit and terminal e of air mix actuator? Yes No Yes No Yes No Yes No Inspect air mix actuator, then go to step 21. Go to next step. 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. Replace rear climate control unit, go to step 21. Go to next step. Repair wiring harness between rear climate control unit and air mix actuator, go to step 21. *7 Inspect wiring harness between rear climate Yes Repair wiring harness between rear U-28

Troubleshotting Step Inspection Action control unit and air mix actuator to determine whether it is short to ground. • Is there continuity between terminal e (voltage divider signal) of air mix actuator and ground? No climate control unit and air mix actuator, and then go to step 21. Go to next step. *8 Inspect wiring harness between rear climate control unit and air mix actuator for short with b+ (positive battery voltage) • Turn ignition switch to on position. • Measure wiring harness-side voltage of terminal e (voltage divider input signal) of air mix actuator. • Is voltage approximately equivalent to b+ (positive battery voltage)? *9 Inspect continuity of wiring harness between rear climate control unit and air mix actuator. • Is circuit between terminal e of rear climate control unit and terminal a of air mix actuator close? *10 Inspect wiring harness between rear climate control unit and air mix actuator to determine whether it is short to ground. • Is there continuity between terminal e of rear climate control unit connector and ground? *11 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 voltage at terminal e of rear climate control unit connector. • Is voltage approximately equivalent to b+ (positive battery voltage)? Yes No Yes No Yes No Yes No Repair wiring harness between rear climate control unit and air mix actuator, go to step 21. Go to next step. 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. U-29

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